Migrate spelling-0.0.21 changes from main

<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? -->
## Summary of the Pull Request
Immediately cancelling the preview when the user is navigating back from a nested command.

<!-- Other than the issue solved, is this relevant to any other issues/existing PRs? -->
## References

<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist
* [x] Closes #10165
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [ ] Tests added/passed
* [ ] Documentation updated. If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx
* [ ] Schema updated.
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

<!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments
Basically 2 changes are done here:
- Allow the click handler to run for the back button when the button has focus and user hits the enter key (similarly as hitting space now).
- Now immediately cancelling the preview when the user is navigating back. Felt nicer to do it immediately at that point then keeping the preview active until the user hits cancel to close the palette. So the preview is already cancelled at step **5** instead of 6 as mentioned in the reproduction steps here https://github.com/microsoft/terminal/issues/10165#issue-899838383. But of course let me know if you're not agreeing here 😀 .

<!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
- Open 'Color Scheme' and verified preview is still working fine when selecting different schemes.
- After tabbing back to the Back button verified that when hitting enter or space the preview is cancelled and the original color scheme is being used again.
- Then after going back to 'Color Scheme' previews are still working ok.
- After hitting Enter on one of the Color Schemes the scheme still becomes active as before.

(cherry picked from commit 1cc383f865)

.config/dotnet-tools.json

@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "XamlStyler.Console": {
+      "version": "3.2008.4",
+      "commands": [
+        "xstyler"
+      ]
+    }
+  }
+}

.github/ISSUE_TEMPLATE/Bug_Report.md

@@ -1,54 +0,0 @@
----
-name: "Bug report 🐛"
-about: Report errors or unexpected behavior
-title: ''
-labels: ''
-assignees: ''
-
----
-
-<!-- 
-🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨
-
-I ACKNOWLEDGE THE FOLLOWING BEFORE PROCEEDING:
-1. If I delete this entire template and go my own path, the core team may close my issue without further explanation or engagement.
-2. If I list multiple bugs/concerns in this one issue, the core team may close my issue without further explanation or engagement.
-3. If I write an issue that has many duplicates, the core team may close my issue without further explanation or engagement (and without necessarily spending time to find the exact duplicate ID number).
-4. If I leave the title incomplete when filing the issue, the core team may close my issue without further explanation or engagement.
-5. If I file something completely blank in the body, the core team may close my issue without further explanation or engagement.
-
-All good? Then proceed!
--->
-
-<!--
-This bug tracker is monitored by Windows Terminal development team and other technical folks.
-
-**Important: When reporting BSODs or security issues, DO NOT attach memory dumps, logs, or traces to Github issues**.
-Instead, send dumps/traces to secure@microsoft.com, referencing this GitHub issue.
-
-If this is an application crash, please also provide a Feedback Hub submission link so we can find your diagnostic data on the backend. Use the category "Apps > Windows Terminal (Preview)" and choose "Share My Feedback" after submission to get the link.
-
-Please use this form and describe your issue, concisely but precisely, with as much detail as possible.
-
--->
-
-# Environment
-
-```none
-Windows build number: [run `[Environment]::OSVersion` for powershell, or `ver` for cmd]
-Windows Terminal version (if applicable):
-
-Any other software?
-```
-
-# Steps to reproduce
-
-<!-- A description of how to trigger this bug. -->
-
-# Expected behavior
-
-<!-- A description of what you're expecting, possibly containing screenshots or reference material. -->
-
-# Actual behavior
-
-<!-- What's actually happening? -->

.github/ISSUE_TEMPLATE/Bug_Report.yml

@@ -0,0 +1,57 @@
+name: "Bug report 🐛"
+description: Report errors or unexpected behavior
+title: ''
+labels: ''
+assignees: ''
+issue_body: true
+body:
+- type: markdown
+  attributes:
+    value: |
+      Please make sure to [search for existing issues](https://github.com/microsoft/terminal/issues) before filing a new one!
+
+      If this is an application crash, please also provide a [Feedback Hub](https://aka.ms/terminal-feedback-hub) submission link so we can find your diagnostic data on the backend. Use the category "Apps > Windows Terminal" and choose "Share My Feedback" after submission to get the link.
+
+- type: input
+  attributes:
+    label: Windows Terminal version (or Windows build number)
+    placeholder: "10.0.19042.0, 1.7.3651.0"
+    description: |
+      If you are reporting an issue in Windows Terminal, you can find the version in the about dialog.
+
+      If you are reporting an issue with the Windows Console, please run `ver` or `[Environment]::OSVersion`.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Other Software
+    description: If you're reporting a bug about our interaction with other software, what software? What versions?
+    placeholder: |
+      vim 8.2 (inside WSL)
+      OpenSSH_for_Windows_8.1p1
+      My Cool Application v0.3 (include a code snippet if it would help!)
+  validations:
+    required: false
+
+- type: textarea
+  attributes:
+    label: Steps to reproduce
+    placeholder: Tell us the steps required to trigger your bug.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Expected Behavior
+    description: If you want to include screenshots, paste them into the markdown editor below the form or follow up with a separate comment.
+    placeholder: What were you expecting?
+  validations:
+    required: false
+
+- type: textarea
+  attributes:
+    label: Actual Behavior
+    placeholder: What happened instead?
+  validations:
+    required: true

.nuget/packages.config

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="vswhere" version="2.6.7" />
-</packages>
+</packages>

.vscode/settings.json

@@ -21,20 +21,7 @@
         "xloctime": "cpp",
         "multi_span": "cpp",
         "pointers": "cpp",
-        "vector": "cpp",
-        "bitset": "cpp",
-        "deque": "cpp",
-        "initializer_list": "cpp",
-        "list": "cpp",
-        "queue": "cpp",
-        "random": "cpp",
-        "regex": "cpp",
-        "stack": "cpp",
-        "xhash": "cpp",
-        "xtree": "cpp",
-        "xutility": "cpp",
-        "span": "cpp",
-        "string_span": "cpp"
+        "vector": "cpp"
     },
     "files.exclude": {
         "**/bin/**": true,

.vscode/tasks.json

@@ -9,14 +9,16 @@
               "-Command",
               "Import-Module ${workspaceFolder}\\tools\\OpenConsole.psm1;",
               "Set-MsBuildDevEnvironment;",
-              "$project = switch(\"${input:buildProjectChoice}\"){OpenConsole{\"Conhost\\Host_EXE\"} Terminal{\"Terminal\\CascadiaPackage\"}  TermControl{\"Terminal\\TerminalControl\"}};",
+              "$project = switch(\"${input:buildProjectChoice}\"){OpenConsole{\"Conhost\\Host_EXE\"} Terminal{\"Terminal\\CascadiaPackage\"}};",
               "$target = switch(\"${input:buildModeChoice}\"){Build{\"\"} Rebuild{\":Rebuild\"} Clean{\":Clean\"}};",
               "$target = $project + $target;",
               "msbuild",
               "${workspaceFolder}\\OpenConsole.sln",
               "/p:Configuration=${input:configChoice}",
               "/p:Platform=${input:platformChoice}",
+              "/p:AppxSymbolPackageEnabled=false", // This takes a long time, so false if we don't really need it.
               "/t:$target",
+              "/m", // Parallel builds
               "/verbosity:minimal"
             ],
             "problemMatcher": ["$msCompile"],
@@ -46,8 +48,7 @@
             ],
             "problemMatcher": ["$msCompile"],
             "group": {
-              "kind": "build",
-              "isDefault": true
+              "kind": "build"
             }
         },
         {
@@ -57,6 +58,18 @@
             "args": [
             ],
             "problemMatcher": ["$msCompile"],
+        },
+        {
+            "type": "process",
+            "label": "Run Code Format",
+            "command": "powershell.exe",
+            "args": [
+              "-Command",
+              "Import-Module ${workspaceFolder}\\tools\\OpenConsole.psm1;",
+              "Set-MsBuildDevEnvironment;",
+              "Invoke-CodeFormat",
+            ],
+            "problemMatcher": ["$msCompile"],
         }
     ],
     "inputs":[
@@ -98,11 +111,10 @@
             "description": "OpenConsole or Terminal?",
             "options":[
                 "OpenConsole",
-                "Terminal",
-                "TermControl"
+                "Terminal"
             ],
             "default": "Terminal"
         }
 
     ]
-}
+}

README.md

@@ -33,10 +33,23 @@ This is our preferred method.
 
 #### Via GitHub
 
-For users who are unable to install Terminal from the Microsoft Store, Terminal
-builds can be manually downloaded from this repository's [Releases
+For users who are unable to install Windows Terminal from the Microsoft Store,
+released builds can be manually downloaded from this repository's [Releases
 page](https://github.com/microsoft/terminal/releases).
 
+Download the `Microsoft.WindowsTerminal_<versionNumber>.msixbundle` file from
+the **Assets** section. To install the app, you can simply double-click on the
+`.msixbundle` file, and the app installer should automatically run. If that
+fails for any reason, you can try the following command at a PowerShell prompt:
+
+```powershell
+# NOTE: If you are using PowerShell 7+, please run
+# Import-Module Appx -UseWindowsPowerShell
+# before using Add-AppxPackage.
+
+Add-AppxPackage Microsoft.WindowsTerminal_<versionNumber>.msixbundle
+```
+
 > 🔴 Note: If you install Terminal manually:
 >
 > * Terminal will not auto-update when new builds are released so you will need

XamlStyler.json

@@ -0,0 +1,41 @@
+{
+    "AttributesTolerance": 1,
+    "KeepFirstAttributeOnSameLine": true,
+    "MaxAttributeCharactersPerLine": 0,
+    "MaxAttributesPerLine": 1,
+    "NewlineExemptionElements": "RadialGradientBrush, GradientStop, LinearGradientBrush, ScaleTransform, SkewTransform, RotateTransform, TranslateTransform, Trigger, Condition, Setter",
+    "SeparateByGroups": false,
+    "AttributeIndentation": 0,
+    "AttributeIndentationStyle": 1,
+    "RemoveDesignTimeReferences":  false,
+    "EnableAttributeReordering": true,
+    "AttributeOrderingRuleGroups": [
+        "x:Class",
+        "xmlns, xmlns:x",
+        "xmlns:*",
+        "x:Key, Key, x:Name, Name, x:Uid, Uid, Title",
+        "Grid.Row, Grid.RowSpan, Grid.Column, Grid.ColumnSpan, Canvas.Left, Canvas.Top, Canvas.Right, Canvas.Bottom",
+        "Width, Height, MinWidth, MinHeight, MaxWidth, MaxHeight",
+        "Margin, Padding, HorizontalAlignment, VerticalAlignment, HorizontalContentAlignment, VerticalContentAlignment, Panel.ZIndex",
+        "*:*, *",
+        "PageSource, PageIndex, Offset, Color, TargetName, Property, Value, StartPoint, EndPoint",
+        "mc:Ignorable, d:IsDataSource, d:LayoutOverrides, d:IsStaticText",
+        "Storyboard.*, From, To, Duration"
+    ],
+    "FirstLineAttributes": "",
+    "OrderAttributesByName": true,
+    "PutEndingBracketOnNewLine": false,
+    "RemoveEndingTagOfEmptyElement": true,
+    "SpaceBeforeClosingSlash": true,
+    "RootElementLineBreakRule": 0,
+    "ReorderVSM": 2,
+    "ReorderGridChildren": false,
+    "ReorderCanvasChildren": false,
+    "ReorderSetters": 0,
+    "FormatMarkupExtension": true,
+    "NoNewLineMarkupExtensions": "x:Bind, Binding",
+    "ThicknessSeparator": 2,
+    "ThicknessAttributes": "Margin, Padding, BorderThickness, ThumbnailClipMargin",
+    "FormatOnSave": true,
+    "CommentPadding": 2,
+}

build/Helix/PrepareHelixPayload.ps1

@@ -19,8 +19,8 @@ New-Item -ItemType Directory -Force -Path $payloadDir
 
 # Copy files from nuget packages
 Copy-Item "$nugetPackagesDir\microsoft.windows.apps.test.1.0.181203002\lib\netcoreapp2.1\*.dll" $payloadDir
-Copy-Item "$nugetPackagesDir\taef.redist.wlk.10.57.200731005-develop\build\Binaries\$Platform\*" $payloadDir
-Copy-Item "$nugetPackagesDir\taef.redist.wlk.10.57.200731005-develop\build\Binaries\$Platform\CoreClr\*" $payloadDir
+Copy-Item "$nugetPackagesDir\Microsoft.Taef.10.58.210305002\build\Binaries\$Platform\*" $payloadDir
+Copy-Item "$nugetPackagesDir\Microsoft.Taef.10.58.210305002\build\Binaries\$Platform\CoreClr\*" $payloadDir
 New-Item -ItemType Directory -Force -Path "$payloadDir\.NETCoreApp2.1\"
 Copy-Item "$nugetPackagesDir\runtime.win-$Platform.microsoft.netcore.app.2.1.0\runtimes\win-$Platform\lib\netcoreapp2.1\*" "$payloadDir\.NETCoreApp2.1\"
 Copy-Item "$nugetPackagesDir\runtime.win-$Platform.microsoft.netcore.app.2.1.0\runtimes\win-$Platform\native\*" "$payloadDir\.NETCoreApp2.1\"

build/Helix/packages.config

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="MUXCustomBuildTasks" version="1.0.48" targetFramework="native" />
-  <package id="TAEF.Redist.Wlk" version="10.57.200731005-develop" targetFramework="native" />
+  <package id="Microsoft.Taef" version="10.58.210305002" targetFramework="native" />
   <package id="microsoft.windows.apps.test" version="1.0.181203002" targetFramework="native" />
   <package id="runtime.win-x86.microsoft.netcore.app" version="2.1.0" targetFramework="native" />
   <package id="runtime.win-x64.microsoft.netcore.app" version="2.1.0" targetFramework="native" />

build/packages.config

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="MUXCustomBuildTasks" version="1.0.48" targetFramework="native" />
-  <package id="TAEF.Redist.Wlk" version="10.57.200731005-develop" targetFramework="native" />
+  <package id="Microsoft.Taef" version="10.58.210305002" targetFramework="native" />
 </packages>

build/pipelines/templates/helix-createprojfile-steps.yml

@@ -12,4 +12,4 @@ steps:
     inputs:
       targetType: filePath
       filePath: build\Helix\GenerateTestProjFile.ps1
-      arguments: -TestFile '${{ parameters.testFilePath }}' -OutputProjFile '$(Build.ArtifactStagingDirectory)\${{ parameters.outputProjFileName }}' -JobTestSuiteName '${{ parameters.testSuite }}' -TaefPath '$(Build.SourcesDirectory)\build\Helix\packages\taef.redist.wlk.10.57.200731005-develop\build\Binaries\x86' -TaefQuery '${{ parameters.taefQuery }}'
+      arguments: -TestFile '${{ parameters.testFilePath }}' -OutputProjFile '$(Build.ArtifactStagingDirectory)\${{ parameters.outputProjFileName }}' -JobTestSuiteName '${{ parameters.testSuite }}' -TaefPath '$(Build.SourcesDirectory)\build\Helix\packages\Microsoft.Taef.10.58.210305002\build\Binaries\x86' -TaefQuery '${{ parameters.taefQuery }}'

build/pipelines/templates/helix-runtests-job.yml

@@ -36,7 +36,7 @@ jobs:
     matrix: ${{ parameters.matrix }}
   variables:
     artifactsDir: $(Build.SourcesDirectory)\Artifacts
-    taefPath: $(Build.SourcesDirectory)\build\Helix\packages\taef.redist.wlk.10.57.200731005-develop\build\Binaries\$(buildPlatform)
+    taefPath: $(Build.SourcesDirectory)\build\Helix\packages\Microsoft.Taef.10.58.210305002\build\Binaries\$(buildPlatform)
     helixCommonArgs: '/binaryLogger:$(Build.SourcesDirectory)/${{parameters.name}}.$(buildPlatform).$(buildConfiguration).binlog /p:HelixBuild=$(Build.BuildId).$(buildPlatform).$(buildConfiguration) /p:Platform=$(buildPlatform) /p:Configuration=$(buildConfiguration) /p:HelixType=${{parameters.helixType}} /p:TestSuite=${{parameters.testSuite}} /p:ProjFilesPath=$(Build.ArtifactStagingDirectory) /p:rerunPassesRequiredToAvoidFailure=${{parameters.rerunPassesRequiredToAvoidFailure}}'
 
 

build/rules/GenerateFeatureFlags.proj

@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="16.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <!-- THIS PROJECT CANNOT BE LOADED INTO THE SOLUTION. -->
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Release|Any CPU">
+      <Configuration>Release</Configuration>
+      <Platform>AnyCPU</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Fuzzing|Any CPU">
+      <Configuration>Fuzzing</Configuration>
+      <Platform>AnyCPU</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="AuditMode|Any CPU">
+      <Configuration>AuditMode</Configuration>
+      <Platform>AnyCPU</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|Any CPU">
+      <Configuration>Debug</Configuration>
+      <Platform>AnyCPU</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>d97c3c61-53cd-4e72-919b-9a0940e038f9</ProjectGuid>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <IntermediateOutputPath>$(SolutionDir)obj\$(Configuration)\GenerateFeatureFlags\</IntermediateOutputPath>
+    <OpenConsoleCommonOutDir>$(SolutionDir)bin\$(Configuration)\</OpenConsoleCommonOutDir>
+
+    <_WTBrandingName Condition="'$(WindowsTerminalBranding)'=='Preview'">Preview</_WTBrandingName>
+    <_WTBrandingName Condition="'$(WindowsTerminalBranding)'=='Release'">Release</_WTBrandingName>
+    <_WTBrandingName Condition="'$(_WTBrandingName)'==''">Dev</_WTBrandingName>
+  </PropertyGroup>
+
+  <Target Name="_GenerateBranchAndBrandingCache">
+    <Exec Command="git.exe rev-parse --abbrev-ref HEAD"
+      CustomWarningRegularExpression="^fatal:.*"
+      ConsoleToMsBuild="true"
+      IgnoreExitCode="true">
+      <Output TaskParameter="ConsoleOutput" ItemName="_GitBranchLines" />
+    </Exec>
+
+    <ItemGroup>
+      <_BrandingLines Include="$(_WTBrandingName)" />
+    </ItemGroup>
+
+    <WriteLinesToFile File="$(IntermediateOutputPath)branch_branding_cache.txt"
+      Lines="@(_GitBranchLines);@(_BrandingLines)"
+      Overwrite="true"
+      WriteOnlyWhenDifferent="true" />
+
+    <ItemGroup>
+      <FileWrites Include="$(IntermediateOutputPath)branch_branding_cache.txt" />
+      <_BranchBrandingCacheFiles Include="$(IntermediateOutputPath)branch_branding_cache.txt" />
+    </ItemGroup>
+  </Target>
+
+  <Target Name="_RunFeatureFlagScript"
+    Inputs="@(FeatureFlagFile);@(_BranchBrandingCacheFiles)"
+    Outputs="$(OpenConsoleCommonOutDir)\inc\TilFeatureStaging.h"
+    DependsOnTargets="_GenerateBranchAndBrandingCache">
+    <MakeDir Directories="$(OpenConsoleCommonOutDir)\inc" />
+    <Exec
+      Command="powershell -NoLogo -NoProfile -NonInteractive -ExecutionPolicy ByPass -Command &quot;$(SolutionDir)\tools\Generate-FeatureStagingHeader.ps1&quot; -Path &quot;%(FeatureFlagFile.FullPath)&quot; -Branding $(_WTBrandingName)"
+      ConsoleToMsBuild="true"
+      StandardOutputImportance="low">
+      <Output TaskParameter="ConsoleOutput" ItemName="_FeatureFlagFileLines" />
+    </Exec>
+
+    <!--
+      We gather the feature flag output in MSBuild and emit the file so that we can take advantage of
+      WriteOnlyWhenDifferent. Doing this ensures that we don't rebuild the world when the branch changes
+      (if it results in a new TilFeatureStaging.h that would have had the same content/features as the previous one)
+    -->
+
+    <WriteLinesToFile File="$(OpenConsoleCommonOutDir)\inc\TilFeatureStaging.h"
+      Lines="@(_FeatureFlagFileLines)"
+      Overwrite="true"
+      WriteOnlyWhenDifferent="true" />
+
+    <ItemGroup>
+      <FileWrites Include="$(OpenConsoleCommonOutDir)\inc\TilFeatureStaging.h" />
+    </ItemGroup>
+  </Target>
+
+  <Target Name="Build" DependsOnTargets="_RunFeatureFlagScript" />
+  <Target Name="Clean">
+    <Delete Files="$(OpenConsoleCommonOutDir)\inc\TilFeatureStaging.h" />
+  </Target>
+
+  <ItemGroup>
+    <FeatureFlagFile Include="$(SolutionDir)\src\features.xml" />
+  </ItemGroup>
+</Project>

build/scripts/Invoke-FormattingCheck.ps1

@@ -3,12 +3,24 @@
 # Checks for code formatting errors. Will throw exception if any are found.
 function Invoke-CheckBadCodeFormatting() {
     Import-Module ./tools/OpenConsole.psm1
-    Invoke-CodeFormat
+
+    # Don't run the XAML formatter in this step - even if it changes nothing,
+    # it'll still touch all the .xaml files.
+    Invoke-CodeFormat -IgnoreXaml
+
     # returns a non-zero exit code if there are any diffs in the tracked files in the repo
     git diff-index --quiet HEAD --
     if ($lastExitCode -eq 1) {
+
+        # Write the list of files that need updating to the log
+        git diff-index --name-only HEAD
+
         throw "code formatting bad, run Invoke-CodeFormat on branch"
     }
+
+    # Manually check the formatting of our .xaml files, without touching them.
+    Verify-XamlFormat
+
 }
 
 Invoke-CheckBadCodeFormatting

build/scripts/Test-WindowsTerminalPackage.ps1

@@ -58,7 +58,7 @@ Try {
 
     ### Check the activatable class entries for a few DLLs we need.
     $inProcServers = $Manifest.Package.Extensions.Extension.InProcessServer.Path
-    $RequiredInProcServers = ("TerminalApp.dll", "TerminalControl.dll", "TerminalConnection.dll")
+    $RequiredInProcServers = ("TerminalApp.dll", "Microsoft.Terminal.Control.dll", "Microsoft.Terminal.Remoting.dll", "Microsoft.Terminal.Settings.Editor.dll", "Microsoft.Terminal.Settings.Model.dll", "TerminalConnection.dll")
 
     Write-Verbose "InProc Servers: $inProcServers"
 

consolegit2gitfilters.json

@@ -19,6 +19,7 @@
     "/.github/",
     "/samples/",
     "/res/terminal/",
+    "/res/fonts/",
     "/doc/specs/",
     "/doc/cascadia/",
     "/doc/user-docs/",
@@ -38,6 +39,7 @@
     ".wrn",
     ".rec",
     ".err",
+    "XamlStyler.json",
     ".xlsx"
   ]
 }

doc/TAEF.md

@@ -12,9 +12,9 @@ Use the [TAEF Verify Macros for C++](https://docs.microsoft.com/en-us/windows-ha
 
 ### Running Tests
 
-If you have Visual Studio and related C++ components installed, and you have successfully restored NuGets, you should have the TAEF test runner `te.exe` available locally as part of the `Taef.Redist.Wlk` package.
+If you have Visual Studio and related C++ components installed, and you have successfully restored NuGets, you should have the TAEF test runner `te.exe` available locally as part of the `Microsoft.Taef` package.
 
-> Note that you cannot easily run TAEF tests directly through Visual Studio. The `Taef.Redist.Wlk` NuGet package comes with an adapter that will let you browse and execute TAEF tests inside of Visual Studio, but its performance and reliability prevent us from recommending it here.
+> Note that you cannot easily run TAEF tests directly through Visual Studio. The `Microsoft.Taef` NuGet package comes with an adapter that will let you browse and execute TAEF tests inside of Visual Studio, but its performance and reliability prevent us from recommending it here.
 
 In a "normal" CMD environment, `te.exe` may not be directly available. Try the following command to set up the development enviroment first:
 

doc/cascadia/Unittesting-CppWinRT-Xaml.md

@@ -166,7 +166,7 @@ should be working just the same as before.
 Now that you have a static library project, you can start building your unittest
 dll. Start by creating a new directory for your unittest code, and creating a
 `.vcxproj` for a TAEF unittest dll. For the Terminal solution, we use the TAEF
-nuget package `Taef.Redist.Wlk`.
+nuget package `Microsoft.Taef`.
 
 ### Referencing your C++/WinRT static lib
 

doc/cascadia/profiles.schema.json

@@ -52,6 +52,117 @@
         }
       ]
     },
+    "AppearanceConfig": {
+      "properties": {
+        "colorScheme": {
+          "description": "The name of a color scheme to use when unfocused.",
+          "type": "string"
+        },
+        "foreground": {
+          "$ref": "#/definitions/Color",
+          "default": "#cccccc",
+          "description": "Sets the text color when unfocused. Overrides \"foreground\" from the color scheme. Uses hex color format: \"#rrggbb\".",
+          "type": ["string", "null"]
+        },
+        "background": {
+          "$ref": "#/definitions/Color",
+          "default": "#0c0c0c",
+          "description": "Sets the background color of the text when unfocused. Overrides \"background\" from the color scheme. Uses hex color format: \"#rrggbb\".",
+          "type": ["string", "null"]
+        },
+        "selectionBackground": {
+          "oneOf": [
+            {"$ref": "#/definitions/Color"},
+            { "type": "null" }
+          ],
+          "description": "Sets the background color of selected text when unfocused. Overrides selectionBackground set in the color scheme. Uses hex color format: \"#rrggbb\"."
+        },
+        "cursorColor": {
+          "oneOf": [
+            { "$ref": "#/definitions/Color" },
+            {"type": "null"}
+          ],
+          "description": "Sets the color of the cursor when unfocused. Overrides the cursor color from the color scheme. Uses hex color format: \"#rrggbb\"."
+        },
+        "cursorShape": {
+          "default": "bar",
+          "description": "Sets the shape of the cursor when unfocused. Possible values:\n -\"bar\" ( ┃, default )\n -\"doubleUnderscore\" ( ‗ )\n -\"emptyBox\" ( ▯ )\n -\"filledBox\" ( █ )\n -\"underscore\" ( ▁ )\n -\"vintage\" ( ▃ )",
+          "enum": [
+            "bar",
+            "doubleUnderscore",
+            "emptyBox",
+            "filledBox",
+            "underscore",
+            "vintage"
+          ],
+          "type": "string"
+        },
+        "cursorHeight": {
+          "description": "Sets the percentage height of the cursor (when unfocused) starting from the bottom. Only works when cursorShape is set to \"vintage\". Accepts values from 1-100.",
+          "maximum": 100,
+          "minimum": 1,
+          "type": ["integer","null"],
+          "default": 25
+        },
+        "backgroundImage": {
+          "description": "Sets the file location of the image to draw over the window background when unfocused.",
+          "oneOf": [
+            {
+              "type": ["string", null]
+            },
+            {
+              "enum": [
+                "desktopWallpaper"
+              ]
+            }
+          ],
+          "type": [ "string", "null" ]
+        },
+        "backgroundImageOpacity": {
+          "default": 1.0,
+          "description": "Sets the transparency of the background image when unfocused. Accepts floating point values from 0-1.",
+          "maximum": 1.0,
+          "minimum": 0.0,
+          "type": "number"
+        },
+        "backgroundImageStretchMode": {
+          "default": "uniformToFill",
+          "description": "Sets how the background image is resized to fill the window when unfocused.",
+          "enum": [
+            "fill",
+            "none",
+            "uniform",
+            "uniformToFill"
+          ],
+          "type": "string"
+        },
+        "backgroundImageAlignment": {
+          "default": "center",
+          "enum": [
+            "bottom",
+            "bottomLeft",
+            "bottomRight",
+            "center",
+            "left",
+            "right",
+            "top",
+            "topLeft",
+            "topRight"
+          ],
+          "description": "Sets how the background image aligns to the boundaries of the window when unfocused. Possible values: \"center\", \"left\", \"top\", \"right\", \"bottom\", \"topLeft\", \"topRight\", \"bottomLeft\", \"bottomRight\"",
+          "type": "string"
+        },
+        "experimental.retroTerminalEffect": {
+          "description": "When set to true, enable retro terminal effects when unfocused. This is an experimental feature, and its continued existence is not guaranteed.",
+          "type": "boolean"
+        },
+        "experimental.pixelShaderPath": {
+          "description": "Use to set a path to a pixel shader to use with the Terminal when unfocused. Overrides `experimental.retroTerminalEffect`. This is an experimental feature, and its continued existence is not guaranteed.",
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
     "ProfileGuid": {
       "default": "{}",
       "pattern": "^\\{[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}\\}$",
@@ -77,6 +188,8 @@
         "duplicateTab",
         "find",
         "findMatch",
+        "identifyWindow",
+        "identifyWindows",
         "moveFocus",
         "moveTab",
         "newTab",
@@ -85,12 +198,14 @@
         "openNewTabDropdown",
         "openSettings",
         "openTabColorPicker",
+        "openWindowRenamer",
         "paste",
         "prevTab",
         "renameTab",
         "openTabRenamer",
         "resetFontSize",
         "resizePane",
+        "renameWindow",
         "scrollDown",
         "scrollDownPage",
         "scrollUp",
@@ -227,10 +342,27 @@
           "type": "boolean",
           "default": "false",
           "description": "When set to true, tabTitle overrides the default title of the tab and any title change messages from the application will be suppressed. When set to false, tabTitle behaves as normal"
+        },
+        "colorScheme": {
+          "description": "The name of a color scheme to use, instead of the one specified by the profile",
+          "type": "string"
         }
       },
       "type": "object"
     },
+    "SwitchToAdjacentTabArgs" : {
+      "oneOf": [
+        { "type": "null" },
+        {
+          "enum": [
+            "mru",
+            "inOrder",
+            "disabled"
+          ],
+          "type": "string"
+        }
+      ]
+    },
     "ShortcutAction": {
       "properties": {
         "action": {
@@ -409,12 +541,14 @@
             "action": { "type": "string", "pattern": "openSettings" },
             "target": {
               "type": "string",
-              "default": "settingsFile",
-              "description": "The settings file to open.",
+              "default": "settingsUI",
+              "description": "Opens Settings UI or settings file.",
               "enum": [
                 "settingsFile",
                 "defaultsFile",
-                "allFiles"
+                "allFiles",
+                "settingsUI"
+                
               ]
             }
           }
@@ -602,6 +736,70 @@
         }
       ]
     },
+    "PrevTabAction": {
+      "description": "Arguments corresponding to a Previous Tab Action",
+      "allOf": [
+        { "$ref": "#/definitions/ShortcutAction" },
+        {
+          "properties": {
+            "action": { "type":"string", "pattern": "prevTab" },
+            "tabSwitcherMode": {
+              "$ref": "#/definitions/SwitchToAdjacentTabArgs",
+              "default": null,
+              "description": "Move to the previous tab using \"tabSwitcherMode\". If no mode is provided, use the one globally defined one."
+            }
+          }
+        }
+      ]
+    },
+    "NextTabAction": {
+      "description": "Arguments corresponding to a Next Tab Action",
+      "allOf": [
+        { "$ref": "#/definitions/ShortcutAction" },
+        {
+          "properties": {
+            "action": { "type":"string", "pattern": "nextTab" },
+            "tabSwitcherMode": {
+              "$ref": "#/definitions/SwitchToAdjacentTabArgs",
+              "default": null,
+              "description": "Move to the next tab using \"tabSwitcherMode\". If no mode is provided, use the one globally defined one."
+            }
+          }
+        }
+      ]
+    },
+    "RenameTabAction": {
+      "description": "Arguments corresponding to a renameTab Action",
+      "allOf": [
+        { "$ref": "#/definitions/ShortcutAction" },
+        {
+          "properties": {
+            "action": { "type": "string", "pattern": "renameTab" },
+            "title": {
+              "type": "string",
+              "default": "",
+              "description": "A title to assign to the tab. If omitted or null, this action will restore the tab's title to the original value."
+            }
+          }
+        }
+      ]
+    },
+    "RenameWindowAction": {
+      "description": "Arguments corresponding to a renameWindow Action",
+      "allOf": [
+        { "$ref": "#/definitions/ShortcutAction" },
+        {
+          "properties": {
+            "action": { "type": "string", "pattern": "renameWindow" },
+            "name": {
+              "type": "string",
+              "default": "",
+              "description": "A name to assign to the window."
+            }
+          }
+        }
+      ]
+    },
     "Keybinding": {
       "additionalProperties": false,
       "properties": {
@@ -628,6 +826,10 @@
               { "$ref": "#/definitions/MoveTabAction" },
               { "$ref": "#/definitions/FindMatchAction" },
               { "$ref": "#/definitions/NewWindowAction" },
+              { "$ref": "#/definitions/NextTabAction" },
+              { "$ref": "#/definitions/PrevTabAction" },
+              { "$ref": "#/definitions/RenameTabAction" },
+              { "$ref": "#/definitions/RenameWindowAction" },
               { "type": "null" }
             ]
         },
@@ -911,6 +1113,11 @@
           "description": "Sets the background color of the text. Overrides \"background\" from the color scheme. Uses hex color format: \"#rrggbb\".",
           "type": ["string", "null"]
         },
+        "unfocusedAppearance": {
+          "$ref": "#/definitions/AppearanceConfig",
+          "description": "Sets the appearance of the terminal when it is unfocused.",
+          "type": ["object", "null"]
+        },
         "backgroundImage": {
           "description": "Sets the file location of the image to draw over the window background.",
           "oneOf": [
@@ -1142,6 +1349,11 @@
           "type": "boolean",
           "default": false
         },
+        "tabColor": {
+          "$ref": "#/definitions/Color",
+          "description": "Sets the color of the profile's tab. Using the tab color picker will override this color.",
+          "type": ["string", "null"]
+        },
         "tabTitle": {
           "description": "If set, will replace the name as the title to pass to the shell on startup. Some shells (like bash) may choose to ignore this initial value, while others (cmd, powershell) may use this value over the lifetime of the application.",
           "type": ["string", "null"]

doc/feature_flags.md

@@ -0,0 +1,65 @@
+# til::feature
+
+Feature flags are controlled by an XML document stored at `src/features.xml`.
+
+## Example Document
+
+```xml
+<?xml version="1.0"?>
+<featureStaging xmlns="http://microsoft.com/TilFeatureStaging-Schema.xsd">
+    <feature>
+        <!-- This will produce Feature_XYZ::IsEnabled() and TIL_FEATURE_XYZ_ENABLED (preprocessor) -->
+        <name>Feature_XYZ</name>
+
+        <description>Does a cool thing</description>
+
+        <!-- GitHub deliverable number; optional -->
+        <id>1234</id>
+
+        <!-- Whether the feature defaults to enabled or disabled -->
+        <stage>AlwaysEnabled|AlwaysDisabled</stage>
+
+        <!-- Branch wildcards where the feature should be *DISABLED* -->
+        <alwaysDisabledBranchTokens>
+            <branchToken>branch/with/wildcard/*</branchToken>
+            <!-- ... more branchTokens ... -->
+        </alwaysDisabledBranchTokens>
+
+        <!-- Just like alwaysDisabledBranchTokens, but for *ENABLING* the feature. -->
+        <alwaysEnabledBranchTokens>
+            <branchToken>...</branchToken>
+        </alwaysEnabledBranchTokens>
+
+        <!-- Brandings where the feature should be *DISABLED* -->
+        <alwaysDisabledBrandingTokens>
+            <!-- Valid brandings include Dev, Preview, Release, WindowsInbox -->
+            <brandingToken>Release</brandingToken>
+            <!-- ... more brandingTokens ... -->
+        </alwaysDisabledBrandingTokens>
+
+        <!-- Just like alwaysDisabledBrandingTokens, but for *ENABLING* the feature -->
+        <alwaysEnabledBrandingTokens>
+            <branchToken>...</branchToken>
+        </alwaysEnabledBrandingTokens>
+
+        <!-- Unequivocally disable this feature in Release -->
+        <alwaysDisabledReleaseTokens />
+    </feature>
+</featureStaging>
+```
+
+## Notes
+
+Features that are disabled for Release using `alwaysDisabledReleaseTokens` are
+*always* disabled in Release, even if they come from a branch that would have
+been enabled by the wildcard.
+
+### Precedence
+
+1. `alwaysDisabledReleaseTokens`
+2. Enabled branches
+3. Disabled branches
+   * The longest branch token that matches your branch will win.
+3. Enabled brandings
+4. Disabled brandings
+5. The feature's default state

doc/terminal-v2-roadmap.md

@@ -2,17 +2,16 @@
 
 ## Overview
 
-This document outlines the roadmap towards delivering Windows Terminal 2.0 by Spring 2021.
-
+This document outlines the roadmap towards delivering Windows Terminal 2.0 by Winter 2021.
 
 ## Milestones
 
-The Windows Terminal project is engineered and delivered as a set of 4-week milestones. New features will go into [Windows Terminal Preview](https://aka.ms/terminal-preview) first, then a month after they've been in Preview, those features will move into [Windows Terminal](https://aka.ms/terminal).
+Windows Terminal is engineered and delivered as a set of 6-week milestones. New features will go into [Windows Terminal Preview](https://aka.ms/terminal-preview) first, then a month after they've been in Preview, those features will move into [Windows Terminal](https://aka.ms/terminal).
 
 | Duration | Activity | Releases |
 | --- | --- | --- |
-| 2 weeks | Dev Work<br/> <ul><li>Fixes / Features for future Windows Releases</li><li>Fixes / Features for Windows Terminal</li></ul> |  Release to Internal Selfhosters at end of week 2 |
-| 1 week | Quality & Stability<br/> <ul><li>Bug Fixes</li><li>Perf & Stability</li><li>UI Polish</li><li>Tests</li><li>etc.</li></ul>| Push to Microsoft Store at end of week 3 |
+| 4 weeks | Dev Work<br/> <ul><li>Fixes / Features for future Windows Releases</li><li>Fixes / Features for Windows Terminal</li></ul> |  Release to Internal Selfhosters at end of week 4 |
+| 1 week | Quality & Stability<br/> <ul><li>Bug Fixes</li><li>Perf & Stability</li><li>UI Polish</li><li>Tests</li><li>etc.</li></ul>| Push to Microsoft Store at end of week 5 |
 | 1 week | Release <br/> <ul><li>Available from [Microsoft Store](https://aka.ms/terminal) & [GitHub Releases](https://github.com/microsoft/terminal/releases)</li><li>Release Notes & Announcement Blog published</li><li>Engineering System Maintenance</li><li>Community Engagement</li><li>Docs</li><li>Future Milestone Planning</li></ul> | Release available from Microsoft Store & GitHub Releases |
 
 ## Terminal Roadmap / Timeline
@@ -26,12 +25,15 @@ Below is the schedule for when milestones will be included in release builds of
 | 2020-08-31 | [1.3] in Windows Terminal Preview<br>[1.2] in Windows Terminal | [Windows Terminal Preview 1.3 Release](https://devblogs.microsoft.com/commandline/windows-terminal-preview-1-3-release/) |
 | 2020-09-30 | [1.4] in Windows Terminal Preview<br>[1.3] in Windows Terminal | [Windows Terminal Preview 1.4 Release](https://devblogs.microsoft.com/commandline/windows-terminal-preview-1-4-release/) |
 | 2020-11-30 | [1.5] in Windows Terminal Preview<br>[1.4] in Windows Terminal | [Windows Terminal Preview 1.5 Release](https://devblogs.microsoft.com/commandline/windows-terminal-preview-1-5-release/) |
-| 2020-12-31 | [1.6] in Windows Terminal Preview<br>[1.5] in Windows Terminal | |
-| 2021-01-31 | 1.7 in Windows Terminal Preview<br>[1.6] in Windows Terminal | |
-| 2021-02-28 | 1.8 in Windows Terminal Preview<br>1.8 in Windows Terminal | |
-| 2021-03-31 | 1.9 in Windows Terminal Preview<br>1.9 in Windows Terminal | |
-| 2021-04-30 | 2.0 RC in Windows Terminal Preview<br>2.0 RC in Windows Terminal | |
-| 2021-05-31 | [2.0] in Windows Terminal Preview<br>[2.0] in Windows Terminal | |
+| 2021-01-31 | [1.6] in Windows Terminal Preview<br>[1.5] in Windows Terminal | [Windows Terminal Preview 1.6 Release](https://devblogs.microsoft.com/commandline/windows-terminal-preview-1-6-release/) |
+| 2021-03-01 | [1.7] in Windows Terminal Preview<br>[1.6] in Windows Terminal | [Windows Terminal Preview 1.7 Release](https://devblogs.microsoft.com/commandline/windows-terminal-preview-1-7-release/) |
+| 2021-04-30 | [1.8] in Windows Terminal Preview<br>[1.7] in Windows Terminal | |
+| 2021-05-31 | [1.9] in Windows Terminal Preview<br>[1.8] in Windows Terminal | |
+| 2021-07-31 | 1.10 in Windows Terminal Preview<br>[1.9] in Windows Terminal | |
+| 2021-08-30 | 1.11 in Windows Terminal Preview<br>1.10 in Windows Terminal | |
+| 2021-10-31 | 1.12 in Windows Terminal Preview<br>1.11 in Windows Terminal | |
+| 2021-11-30 | 2.0 RC in Windows Terminal Preview<br>2.0 RC in Windows Terminal | |
+| 2021-12-31 | [2.0] in Windows Terminal Preview<br>[2.0] in Windows Terminal | |
 
 ## Issue Triage & Prioritization
 
@@ -84,6 +86,9 @@ Feature Notes:
 [1.4]: https://github.com/microsoft/terminal/milestone/28
 [1.5]: https://github.com/microsoft/terminal/milestone/30
 [1.6]: https://github.com/microsoft/terminal/milestone/31
+[1.7]: https://github.com/microsoft/terminal/milestone/32
+[1.8]: https://github.com/microsoft/terminal/milestone/33
+[1.9]: https://github.com/microsoft/terminal/milestone/34
 [2.0]: https://github.com/microsoft/terminal/milestone/22
 [#1564]: https://github.com/microsoft/terminal/issues/1564
 [#6720]: https://github.com/microsoft/terminal/pull/6720

oss/fmt/cgmanifest.json

@@ -4,7 +4,7 @@
        "type": "git", 
        "git": { 
          "repositoryUrl": "https://github.com/fmtlib/fmt", 
-         "commitHash": "f19b1a521ee8b606dedcadfda69fd10ddf882753" 
+         "commitHash": "7bdf0628b1276379886c7f6dda2cef2b3b374f0b" 
          }
        }
     }

oss/fmt/include/fmt/chrono.h

@@ -72,43 +72,27 @@ FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) {
   static_assert(F::is_integer, "From must be integral");
   static_assert(T::is_integer, "To must be integral");
 
-  if (F::is_signed && !T::is_signed) {
+  if (detail::const_check(F::is_signed && !T::is_signed)) {
     // From may be negative, not allowed!
     if (fmt::detail::is_negative(from)) {
       ec = 1;
       return {};
     }
-
     // From is positive. Can it always fit in To?
-    if (F::digits <= T::digits) {
-      // yes, From always fits in To.
-    } else {
-      // from may not fit in To, we have to do a dynamic check
-      if (from > static_cast<From>((T::max)())) {
-        ec = 1;
-        return {};
-      }
+    if (F::digits > T::digits &&
+        from > static_cast<From>(detail::max_value<To>())) {
+      ec = 1;
+      return {};
     }
   }
 
-  if (!F::is_signed && T::is_signed) {
-    // can from be held in To?
-    if (F::digits < T::digits) {
-      // yes, From always fits in To.
-    } else {
-      // from may not fit in To, we have to do a dynamic check
-      if (from > static_cast<From>((T::max)())) {
-        // outside range.
-        ec = 1;
-        return {};
-      }
-    }
+  if (!F::is_signed && T::is_signed && F::digits >= T::digits &&
+      from > static_cast<From>(detail::max_value<To>())) {
+    ec = 1;
+    return {};
   }
-
-  // reaching here means all is ok for lossless conversion.
-  return static_cast<To>(from);
-
-}  // function
+  return static_cast<To>(from);  // Lossless conversion.
+}
 
 template <typename To, typename From,
           FMT_ENABLE_IF(std::is_same<From, To>::value)>
@@ -190,11 +174,9 @@ To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from,
   // safe conversion to IntermediateRep
   IntermediateRep count =
       lossless_integral_conversion<IntermediateRep>(from.count(), ec);
-  if (ec) {
-    return {};
-  }
+  if (ec) return {};
   // multiply with Factor::num without overflow or underflow
-  if (Factor::num != 1) {
+  if (detail::const_check(Factor::num != 1)) {
     const auto max1 = detail::max_value<IntermediateRep>() / Factor::num;
     if (count > max1) {
       ec = 1;
@@ -209,17 +191,9 @@ To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from,
     count *= Factor::num;
   }
 
-  // this can't go wrong, right? den>0 is checked earlier.
-  if (Factor::den != 1) {
-    count /= Factor::den;
-  }
-  // convert to the to type, safely
-  using ToRep = typename To::rep;
-  const ToRep tocount = lossless_integral_conversion<ToRep>(count, ec);
-  if (ec) {
-    return {};
-  }
-  return To{tocount};
+  if (detail::const_check(Factor::den != 1)) count /= Factor::den;
+  auto tocount = lossless_integral_conversion<typename To::rep>(count, ec);
+  return ec ? To() : To(tocount);
 }
 
 /**
@@ -351,6 +325,11 @@ inline std::tm localtime(std::time_t time) {
   return lt.tm_;
 }
 
+inline std::tm localtime(
+    std::chrono::time_point<std::chrono::system_clock> time_point) {
+  return localtime(std::chrono::system_clock::to_time_t(time_point));
+}
+
 // Thread-safe replacement for std::gmtime
 inline std::tm gmtime(std::time_t time) {
   struct dispatcher {
@@ -387,6 +366,11 @@ inline std::tm gmtime(std::time_t time) {
   return gt.tm_;
 }
 
+inline std::tm gmtime(
+    std::chrono::time_point<std::chrono::system_clock> time_point) {
+  return gmtime(std::chrono::system_clock::to_time_t(time_point));
+}
+
 namespace detail {
 inline size_t strftime(char* str, size_t count, const char* format,
                        const std::tm* time) {
@@ -399,6 +383,17 @@ inline size_t strftime(wchar_t* str, size_t count, const wchar_t* format,
 }
 }  // namespace detail
 
+template <typename Char>
+struct formatter<std::chrono::time_point<std::chrono::system_clock>, Char>
+    : formatter<std::tm, Char> {
+  template <typename FormatContext>
+  auto format(std::chrono::time_point<std::chrono::system_clock> val,
+              FormatContext& ctx) -> decltype(ctx.out()) {
+    std::tm time = localtime(val);
+    return formatter<std::tm, Char>::format(time, ctx);
+  }
+};
+
 template <typename Char> struct formatter<std::tm, Char> {
   template <typename ParseContext>
   auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {

oss/fmt/include/fmt/color.h

@@ -463,16 +463,16 @@ template <> inline void reset_color<wchar_t>(FILE* stream) FMT_NOEXCEPT {
 }
 
 template <typename Char>
-inline void reset_color(basic_memory_buffer<Char>& buffer) FMT_NOEXCEPT {
+inline void reset_color(buffer<Char>& buffer) FMT_NOEXCEPT {
   const char* begin = data::reset_color;
   const char* end = begin + sizeof(data::reset_color) - 1;
   buffer.append(begin, end);
 }
 
 template <typename Char>
-void vformat_to(basic_memory_buffer<Char>& buf, const text_style& ts,
+void vformat_to(buffer<Char>& buf, const text_style& ts,
                 basic_string_view<Char> format_str,
-                basic_format_args<buffer_context<Char>> args) {
+                basic_format_args<buffer_context<type_identity_t<Char>>> args) {
   bool has_style = false;
   if (ts.has_emphasis()) {
     has_style = true;
@@ -496,7 +496,7 @@ void vformat_to(basic_memory_buffer<Char>& buf, const text_style& ts,
 
 template <typename S, typename Char = char_t<S>>
 void vprint(std::FILE* f, const text_style& ts, const S& format,
-            basic_format_args<buffer_context<Char>> args) {
+            basic_format_args<buffer_context<type_identity_t<Char>>> args) {
   basic_memory_buffer<Char> buf;
   detail::vformat_to(buf, ts, to_string_view(format), args);
   buf.push_back(Char(0));
@@ -504,20 +504,22 @@ void vprint(std::FILE* f, const text_style& ts, const S& format,
 }
 
 /**
+  \rst
   Formats a string and prints it to the specified file stream using ANSI
   escape sequences to specify text formatting.
-  Example:
+
+  **Example**::
+
     fmt::print(fmt::emphasis::bold | fg(fmt::color::red),
                "Elapsed time: {0:.2f} seconds", 1.23);
+  \endrst
  */
 template <typename S, typename... Args,
           FMT_ENABLE_IF(detail::is_string<S>::value)>
 void print(std::FILE* f, const text_style& ts, const S& format_str,
            const Args&... args) {
-  detail::check_format_string<Args...>(format_str);
-  using context = buffer_context<char_t<S>>;
-  format_arg_store<context, Args...> as{args...};
-  vprint(f, ts, format_str, basic_format_args<context>(as));
+  vprint(f, ts, format_str,
+         fmt::make_args_checked<Args...>(format_str, args...));
 }
 
 /**
@@ -558,7 +560,42 @@ template <typename S, typename... Args, typename Char = char_t<S>>
 inline std::basic_string<Char> format(const text_style& ts, const S& format_str,
                                       const Args&... args) {
   return vformat(ts, to_string_view(format_str),
-                 detail::make_args_checked<Args...>(format_str, args...));
+                 fmt::make_args_checked<Args...>(format_str, args...));
+}
+
+/**
+  Formats a string with the given text_style and writes the output to ``out``.
+ */
+template <typename OutputIt, typename Char,
+          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value)>
+OutputIt vformat_to(
+    OutputIt out, const text_style& ts, basic_string_view<Char> format_str,
+    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
+  decltype(detail::get_buffer<Char>(out)) buf(detail::get_buffer_init(out));
+  detail::vformat_to(buf, ts, format_str, args);
+  return detail::get_iterator(buf);
+}
+
+/**
+  \rst
+  Formats arguments with the given text_style, writes the result to the output
+  iterator ``out`` and returns the iterator past the end of the output range.
+
+  **Example**::
+
+    std::vector<char> out;
+    fmt::format_to(std::back_inserter(out),
+                   fmt::emphasis::bold | fg(fmt::color::red), "{}", 42);
+  \endrst
+*/
+template <typename OutputIt, typename S, typename... Args,
+          bool enable = detail::is_output_iterator<OutputIt, char_t<S>>::value&&
+              detail::is_string<S>::value>
+inline auto format_to(OutputIt out, const text_style& ts, const S& format_str,
+                      Args&&... args) ->
+    typename std::enable_if<enable, OutputIt>::type {
+  return vformat_to(out, ts, to_string_view(format_str),
+                    fmt::make_args_checked<Args...>(format_str, args...));
 }
 
 FMT_END_NAMESPACE

oss/fmt/include/fmt/compile.h

@@ -368,7 +368,8 @@ template <typename... Args> struct type_list {};
 
 // Returns a reference to the argument at index N from [first, rest...].
 template <int N, typename T, typename... Args>
-constexpr const auto& get(const T& first, const Args&... rest) {
+constexpr const auto& get([[maybe_unused]] const T& first,
+                          [[maybe_unused]] const Args&... rest) {
   static_assert(N < 1 + sizeof...(Args), "index is out of bounds");
   if constexpr (N == 0)
     return first;
@@ -406,6 +407,19 @@ constexpr text<Char> make_text(basic_string_view<Char> s, size_t pos,
   return {{&s[pos], size}};
 }
 
+template <typename Char> struct code_unit {
+  Char value;
+  using char_type = Char;
+
+  template <typename OutputIt, typename... Args>
+  OutputIt format(OutputIt out, const Args&...) const {
+    return write<Char>(out, value);
+  }
+};
+
+template <typename Char>
+struct is_compiled_format<code_unit<Char>> : std::true_type {};
+
 // A replacement field that refers to argument N.
 template <typename Char, typename T, int N> struct field {
   using char_type = Char;
@@ -430,7 +444,9 @@ template <typename Char, typename T, int N> struct spec_field {
   OutputIt format(OutputIt out, const Args&... args) const {
     // This ensures that the argument type is convertile to `const T&`.
     const T& arg = get<N>(args...);
-    basic_format_context<OutputIt, Char> ctx(out, {});
+    const auto& vargs =
+        make_format_args<basic_format_context<OutputIt, Char>>(args...);
+    basic_format_context<OutputIt, Char> ctx(out, vargs);
     return fmt.format(arg, ctx);
   }
 };
@@ -489,16 +505,17 @@ constexpr auto parse_tail(T head, S format_str) {
 template <typename T, typename Char> struct parse_specs_result {
   formatter<T, Char> fmt;
   size_t end;
+  int next_arg_id;
 };
 
 template <typename T, typename Char>
 constexpr parse_specs_result<T, Char> parse_specs(basic_string_view<Char> str,
-                                                  size_t pos) {
+                                                  size_t pos, int arg_id) {
   str.remove_prefix(pos);
-  auto ctx = basic_format_parse_context<Char>(str);
+  auto ctx = basic_format_parse_context<Char>(str, {}, arg_id + 1);
   auto f = formatter<T, Char>();
   auto end = f.parse(ctx);
-  return {f, pos + (end - str.data()) + 1};
+  return {f, pos + (end - str.data()) + 1, ctx.next_arg_id()};
 }
 
 // Compiles a non-empty format string and returns the compiled representation
@@ -518,8 +535,8 @@ constexpr auto compile_format_string(S format_str) {
                                                format_str);
     } else if constexpr (str[POS + 1] == ':') {
       using type = get_type<ID, Args>;
-      constexpr auto result = parse_specs<type>(str, POS + 2);
-      return parse_tail<Args, result.end, ID + 1>(
+      constexpr auto result = parse_specs<type>(str, POS + 2, ID);
+      return parse_tail<Args, result.end, result.next_arg_id>(
           spec_field<char_type, type, ID>{result.fmt}, format_str);
     } else {
       return unknown_format();
@@ -530,8 +547,13 @@ constexpr auto compile_format_string(S format_str) {
     return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), format_str);
   } else {
     constexpr auto end = parse_text(str, POS + 1);
-    return parse_tail<Args, end, ID>(make_text(str, POS, end - POS),
-                                     format_str);
+    if constexpr (end - POS > 1) {
+      return parse_tail<Args, end, ID>(make_text(str, POS, end - POS),
+                                       format_str);
+    } else {
+      return parse_tail<Args, end, ID>(code_unit<char_type>{str[POS]},
+                                       format_str);
+    }
   }
 }
 
@@ -587,8 +609,7 @@ template <typename CompiledFormat, typename... Args,
 FMT_INLINE std::basic_string<Char> format(const CompiledFormat& cf,
                                           const Args&... args) {
   basic_memory_buffer<Char> buffer;
-  detail::buffer<Char>& base = buffer;
-  cf.format(std::back_inserter(base), args...);
+  cf.format(detail::buffer_appender<Char>(buffer), args...);
   return to_string(buffer);
 }
 
@@ -608,8 +629,7 @@ template <typename CompiledFormat, typename... Args,
 std::basic_string<Char> format(const CompiledFormat& cf, const Args&... args) {
   basic_memory_buffer<Char> buffer;
   using context = buffer_context<Char>;
-  detail::buffer<Char>& base = buffer;
-  detail::cf::vformat_to<context>(std::back_inserter(base), cf,
+  detail::cf::vformat_to<context>(detail::buffer_appender<Char>(buffer), cf,
                                   make_format_args<context>(args...));
   return to_string(buffer);
 }
@@ -618,9 +638,13 @@ template <typename S, typename... Args,
           FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
 FMT_INLINE std::basic_string<typename S::char_type> format(const S&,
                                                            Args&&... args) {
-  constexpr basic_string_view<typename S::char_type> str = S();
-  if (str.size() == 2 && str[0] == '{' && str[1] == '}')
-    return fmt::to_string(detail::first(args...));
+#ifdef __cpp_if_constexpr
+  if constexpr (std::is_same<typename S::char_type, char>::value) {
+    constexpr basic_string_view<typename S::char_type> str = S();
+    if (str.size() == 2 && str[0] == '{' && str[1] == '}')
+      return fmt::to_string(detail::first(args...));
+  }
+#endif
   constexpr auto compiled = detail::compile<Args...>(S());
   return format(compiled, std::forward<Args>(args)...);
 }
@@ -643,18 +667,30 @@ OutputIt format_to(OutputIt out, const S&, const Args&... args) {
   return format_to(out, compiled, args...);
 }
 
-template <
-    typename OutputIt, typename CompiledFormat, typename... Args,
-    FMT_ENABLE_IF(detail::is_output_iterator<OutputIt>::value&& std::is_base_of<
-                  detail::basic_compiled_format, CompiledFormat>::value)>
-format_to_n_result<OutputIt> format_to_n(OutputIt out, size_t n,
-                                         const CompiledFormat& cf,
-                                         const Args&... args) {
+template <typename OutputIt, typename CompiledFormat, typename... Args>
+auto format_to_n(OutputIt out, size_t n, const CompiledFormat& cf,
+                 const Args&... args) ->
+    typename std::enable_if<
+        detail::is_output_iterator<OutputIt,
+                                   typename CompiledFormat::char_type>::value &&
+            std::is_base_of<detail::basic_compiled_format,
+                            CompiledFormat>::value,
+        format_to_n_result<OutputIt>>::type {
   auto it =
       format_to(detail::truncating_iterator<OutputIt>(out, n), cf, args...);
   return {it.base(), it.count()};
 }
 
+template <typename OutputIt, typename S, typename... Args,
+          FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
+format_to_n_result<OutputIt> format_to_n(OutputIt out, size_t n, const S&,
+                                         const Args&... args) {
+  constexpr auto compiled = detail::compile<Args...>(S());
+  auto it = format_to(detail::truncating_iterator<OutputIt>(out, n), compiled,
+                      args...);
+  return {it.base(), it.count()};
+}
+
 template <typename CompiledFormat, typename... Args>
 size_t formatted_size(const CompiledFormat& cf, const Args&... args) {
   return format_to(detail::counting_iterator(), cf, args...).count();

oss/fmt/include/fmt/core.h

@@ -18,7 +18,7 @@
 #include <vector>
 
 // The fmt library version in the form major * 10000 + minor * 100 + patch.
-#define FMT_VERSION 70001
+#define FMT_VERSION 70103
 
 #ifdef __clang__
 #  define FMT_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__)
@@ -57,6 +57,7 @@
 #  define FMT_MSC_VER 0
 #  define FMT_SUPPRESS_MSC_WARNING(n)
 #endif
+
 #ifdef __has_feature
 #  define FMT_HAS_FEATURE(x) __has_feature(x)
 #else
@@ -64,7 +65,7 @@
 #endif
 
 #if defined(__has_include) && !defined(__INTELLISENSE__) && \
-    !(FMT_ICC_VERSION && FMT_ICC_VERSION < 1600)
+    (!FMT_ICC_VERSION || FMT_ICC_VERSION >= 1600)
 #  define FMT_HAS_INCLUDE(x) __has_include(x)
 #else
 #  define FMT_HAS_INCLUDE(x) 0
@@ -99,7 +100,7 @@
 #endif
 
 #ifndef FMT_OVERRIDE
-#  if FMT_HAS_FEATURE(cxx_override) || \
+#  if FMT_HAS_FEATURE(cxx_override_control) || \
       (FMT_GCC_VERSION >= 408 && FMT_HAS_GXX_CXX11) || FMT_MSC_VER >= 1900
 #    define FMT_OVERRIDE override
 #  else
@@ -152,7 +153,7 @@
 #  if FMT_HAS_CPP14_ATTRIBUTE(deprecated) || FMT_MSC_VER >= 1900
 #    define FMT_DEPRECATED [[deprecated]]
 #  else
-#    if defined(__GNUC__) || defined(__clang__)
+#    if (defined(__GNUC__) && !defined(__LCC__)) || defined(__clang__)
 #      define FMT_DEPRECATED __attribute__((deprecated))
 #    elif FMT_MSC_VER
 #      define FMT_DEPRECATED __declspec(deprecated)
@@ -177,9 +178,17 @@
 #  endif
 #endif
 
-#ifndef FMT_BEGIN_NAMESPACE
+#ifndef FMT_USE_INLINE_NAMESPACES
 #  if FMT_HAS_FEATURE(cxx_inline_namespaces) || FMT_GCC_VERSION >= 404 || \
-      FMT_MSC_VER >= 1900
+      (FMT_MSC_VER >= 1900 && !_MANAGED)
+#    define FMT_USE_INLINE_NAMESPACES 1
+#  else
+#    define FMT_USE_INLINE_NAMESPACES 0
+#  endif
+#endif
+
+#ifndef FMT_BEGIN_NAMESPACE
+#  if FMT_USE_INLINE_NAMESPACES
 #    define FMT_INLINE_NAMESPACE inline namespace
 #    define FMT_END_NAMESPACE \
       }                       \
@@ -269,8 +278,7 @@ struct monostate {};
 
 namespace detail {
 
-// A helper function to suppress bogus "conditional expression is constant"
-// warnings.
+// A helper function to suppress "conditional expression is constant" warnings.
 template <typename T> constexpr T const_check(T value) { return value; }
 
 FMT_NORETURN FMT_API void assert_fail(const char* file, int line,
@@ -299,7 +307,8 @@ template <typename T> struct std_string_view {};
 
 #ifdef FMT_USE_INT128
 // Do nothing.
-#elif defined(__SIZEOF_INT128__) && !FMT_NVCC
+#elif defined(__SIZEOF_INT128__) && !FMT_NVCC && \
+    !(FMT_CLANG_VERSION && FMT_MSC_VER)
 #  define FMT_USE_INT128 1
 using int128_t = __int128_t;
 using uint128_t = __uint128_t;
@@ -506,6 +515,18 @@ template <typename S> struct char_t_impl<S, enable_if_t<is_string<S>::value>> {
   using type = typename result::value_type;
 };
 
+// Reports a compile-time error if S is not a valid format string.
+template <typename..., typename S, FMT_ENABLE_IF(!is_compile_string<S>::value)>
+FMT_INLINE void check_format_string(const S&) {
+#ifdef FMT_ENFORCE_COMPILE_STRING
+  static_assert(is_compile_string<S>::value,
+                "FMT_ENFORCE_COMPILE_STRING requires all format strings to use "
+                "FMT_STRING.");
+#endif
+}
+template <typename..., typename S, FMT_ENABLE_IF(is_compile_string<S>::value)>
+void check_format_string(S);
+
 struct error_handler {
   constexpr error_handler() = default;
   constexpr error_handler(const error_handler&) = default;
@@ -545,8 +566,9 @@ class basic_format_parse_context : private ErrorHandler {
   using iterator = typename basic_string_view<Char>::iterator;
 
   explicit constexpr basic_format_parse_context(
-      basic_string_view<Char> format_str, ErrorHandler eh = {})
-      : ErrorHandler(eh), format_str_(format_str), next_arg_id_(0) {}
+      basic_string_view<Char> format_str, ErrorHandler eh = {},
+      int next_arg_id = 0)
+      : ErrorHandler(eh), format_str_(format_str), next_arg_id_(next_arg_id) {}
 
   /**
     Returns an iterator to the beginning of the format string range being
@@ -616,8 +638,24 @@ template <typename T, typename Context>
 using has_formatter =
     std::is_constructible<typename Context::template formatter_type<T>>;
 
+// Checks whether T is a container with contiguous storage.
+template <typename T> struct is_contiguous : std::false_type {};
+template <typename Char>
+struct is_contiguous<std::basic_string<Char>> : std::true_type {};
+
 namespace detail {
 
+// Extracts a reference to the container from back_insert_iterator.
+template <typename Container>
+inline Container& get_container(std::back_insert_iterator<Container> it) {
+  using bi_iterator = std::back_insert_iterator<Container>;
+  struct accessor : bi_iterator {
+    accessor(bi_iterator iter) : bi_iterator(iter) {}
+    using bi_iterator::container;
+  };
+  return *accessor(it).container;
+}
+
 /**
   \rst
   A contiguous memory buffer with an optional growing ability. It is an internal
@@ -640,6 +678,8 @@ template <typename T> class buffer {
         size_(sz),
         capacity_(cap) {}
 
+  ~buffer() = default;
+
   /** Sets the buffer data and capacity. */
   void set(T* buf_data, size_t buf_capacity) FMT_NOEXCEPT {
     ptr_ = buf_data;
@@ -655,7 +695,6 @@ template <typename T> class buffer {
 
   buffer(const buffer&) = delete;
   void operator=(const buffer&) = delete;
-  virtual ~buffer() = default;
 
   T* begin() FMT_NOEXCEPT { return ptr_; }
   T* end() FMT_NOEXCEPT { return ptr_ + size_; }
@@ -675,24 +714,26 @@ template <typename T> class buffer {
   /** Returns a pointer to the buffer data. */
   const T* data() const FMT_NOEXCEPT { return ptr_; }
 
-  /**
-    Resizes the buffer. If T is a POD type new elements may not be initialized.
-   */
-  void resize(size_t new_size) {
-    reserve(new_size);
-    size_ = new_size;
-  }
-
   /** Clears this buffer. */
   void clear() { size_ = 0; }
 
-  /** Reserves space to store at least *capacity* elements. */
-  void reserve(size_t new_capacity) {
+  // Tries resizing the buffer to contain *count* elements. If T is a POD type
+  // the new elements may not be initialized.
+  void try_resize(size_t count) {
+    try_reserve(count);
+    size_ = count <= capacity_ ? count : capacity_;
+  }
+
+  // Tries increasing the buffer capacity to *new_capacity*. It can increase the
+  // capacity by a smaller amount than requested but guarantees there is space
+  // for at least one additional element either by increasing the capacity or by
+  // flushing the buffer if it is full.
+  void try_reserve(size_t new_capacity) {
     if (new_capacity > capacity_) grow(new_capacity);
   }
 
   void push_back(const T& value) {
-    reserve(size_ + 1);
+    try_reserve(size_ + 1);
     ptr_[size_++] = value;
   }
 
@@ -705,32 +746,150 @@ template <typename T> class buffer {
   }
 };
 
-// A container-backed buffer.
+struct buffer_traits {
+  explicit buffer_traits(size_t) {}
+  size_t count() const { return 0; }
+  size_t limit(size_t size) { return size; }
+};
+
+class fixed_buffer_traits {
+ private:
+  size_t count_ = 0;
+  size_t limit_;
+
+ public:
+  explicit fixed_buffer_traits(size_t limit) : limit_(limit) {}
+  size_t count() const { return count_; }
+  size_t limit(size_t size) {
+    size_t n = limit_ > count_ ? limit_ - count_ : 0;
+    count_ += size;
+    return size < n ? size : n;
+  }
+};
+
+// A buffer that writes to an output iterator when flushed.
+template <typename OutputIt, typename T, typename Traits = buffer_traits>
+class iterator_buffer final : public Traits, public buffer<T> {
+ private:
+  OutputIt out_;
+  enum { buffer_size = 256 };
+  T data_[buffer_size];
+
+ protected:
+  void grow(size_t) final FMT_OVERRIDE {
+    if (this->size() == buffer_size) flush();
+  }
+  void flush();
+
+ public:
+  explicit iterator_buffer(OutputIt out, size_t n = buffer_size)
+      : Traits(n),
+        buffer<T>(data_, 0, buffer_size),
+        out_(out) {}
+  ~iterator_buffer() { flush(); }
+
+  OutputIt out() {
+    flush();
+    return out_;
+  }
+  size_t count() const { return Traits::count() + this->size(); }
+};
+
+template <typename T> class iterator_buffer<T*, T> final : public buffer<T> {
+ protected:
+  void grow(size_t) final FMT_OVERRIDE {}
+
+ public:
+  explicit iterator_buffer(T* out, size_t = 0) : buffer<T>(out, 0, ~size_t()) {}
+
+  T* out() { return &*this->end(); }
+};
+
+// A buffer that writes to a container with the contiguous storage.
 template <typename Container>
-class container_buffer : public buffer<typename Container::value_type> {
+class iterator_buffer<std::back_insert_iterator<Container>,
+                      enable_if_t<is_contiguous<Container>::value,
+                                  typename Container::value_type>>
+    final : public buffer<typename Container::value_type> {
  private:
   Container& container_;
 
  protected:
-  void grow(size_t capacity) FMT_OVERRIDE {
+  void grow(size_t capacity) final FMT_OVERRIDE {
     container_.resize(capacity);
     this->set(&container_[0], capacity);
   }
 
  public:
-  explicit container_buffer(Container& c)
+  explicit iterator_buffer(Container& c)
       : buffer<typename Container::value_type>(c.size()), container_(c) {}
+  explicit iterator_buffer(std::back_insert_iterator<Container> out, size_t = 0)
+      : iterator_buffer(get_container(out)) {}
+  std::back_insert_iterator<Container> out() {
+    return std::back_inserter(container_);
+  }
 };
 
-// Extracts a reference to the container from back_insert_iterator.
-template <typename Container>
-inline Container& get_container(std::back_insert_iterator<Container> it) {
-  using bi_iterator = std::back_insert_iterator<Container>;
-  struct accessor : bi_iterator {
-    accessor(bi_iterator iter) : bi_iterator(iter) {}
-    using bi_iterator::container;
-  };
-  return *accessor(it).container;
+// A buffer that counts the number of code units written discarding the output.
+template <typename T = char> class counting_buffer final : public buffer<T> {
+ private:
+  enum { buffer_size = 256 };
+  T data_[buffer_size];
+  size_t count_ = 0;
+
+ protected:
+  void grow(size_t) final FMT_OVERRIDE {
+    if (this->size() != buffer_size) return;
+    count_ += this->size();
+    this->clear();
+  }
+
+ public:
+  counting_buffer() : buffer<T>(data_, 0, buffer_size) {}
+
+  size_t count() { return count_ + this->size(); }
+};
+
+// An output iterator that appends to the buffer.
+// It is used to reduce symbol sizes for the common case.
+template <typename T>
+class buffer_appender : public std::back_insert_iterator<buffer<T>> {
+  using base = std::back_insert_iterator<buffer<T>>;
+
+ public:
+  explicit buffer_appender(buffer<T>& buf) : base(buf) {}
+  buffer_appender(base it) : base(it) {}
+
+  buffer_appender& operator++() {
+    base::operator++();
+    return *this;
+  }
+
+  buffer_appender operator++(int) {
+    buffer_appender tmp = *this;
+    ++*this;
+    return tmp;
+  }
+};
+
+// Maps an output iterator into a buffer.
+template <typename T, typename OutputIt>
+iterator_buffer<OutputIt, T> get_buffer(OutputIt);
+template <typename T> buffer<T>& get_buffer(buffer_appender<T>);
+
+template <typename OutputIt> OutputIt get_buffer_init(OutputIt out) {
+  return out;
+}
+template <typename T> buffer<T>& get_buffer_init(buffer_appender<T> out) {
+  return get_container(out);
+}
+
+template <typename Buffer>
+auto get_iterator(Buffer& buf) -> decltype(buf.out()) {
+  return buf.out();
+}
+template <typename T> buffer_appender<T> get_iterator(buffer<T>& buf) {
+  return buffer_appender<T>(buf);
 }
 
 template <typename T, typename Char = char, typename Enable = void>
@@ -759,7 +918,8 @@ template <typename Char> struct named_arg_info {
 template <typename T, typename Char, size_t NUM_ARGS, size_t NUM_NAMED_ARGS>
 struct arg_data {
   // args_[0].named_args points to named_args_ to avoid bloating format_args.
-  T args_[1 + (NUM_ARGS != 0 ? NUM_ARGS : 1)];
+  // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning.
+  T args_[1 + (NUM_ARGS != 0 ? NUM_ARGS : +1)];
   named_arg_info<Char> named_args_[NUM_NAMED_ARGS];
 
   template <typename... U>
@@ -771,7 +931,8 @@ struct arg_data {
 
 template <typename T, typename Char, size_t NUM_ARGS>
 struct arg_data<T, Char, NUM_ARGS, 0> {
-  T args_[NUM_ARGS != 0 ? NUM_ARGS : 1];
+  // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning.
+  T args_[NUM_ARGS != 0 ? NUM_ARGS : +1];
 
   template <typename... U>
   FMT_INLINE arg_data(const U&... init) : args_{init...} {}
@@ -959,6 +1120,8 @@ enum { long_short = sizeof(long) == sizeof(int) };
 using long_type = conditional_t<long_short, int, long long>;
 using ulong_type = conditional_t<long_short, unsigned, unsigned long long>;
 
+struct unformattable {};
+
 // Maps formatting arguments to core types.
 template <typename Context> struct arg_mapper {
   using char_type = typename Context::char_type;
@@ -1067,15 +1230,7 @@ template <typename Context> struct arg_mapper {
     return map(val.value);
   }
 
-  int map(...) {
-    constexpr bool formattable = sizeof(Context) == 0;
-    static_assert(
-        formattable,
-        "Cannot format argument. To make type T formattable provide a "
-        "formatter<T> specialization: "
-        "https://fmt.dev/latest/api.html#formatting-user-defined-types");
-    return 0;
-  }
+  unformattable map(...) { return {}; }
 };
 
 // A type constant after applying arg_mapper<Context>.
@@ -1199,15 +1354,25 @@ FMT_CONSTEXPR_DECL FMT_INLINE auto visit_format_arg(
   return vis(monostate());
 }
 
-// Checks whether T is a container with contiguous storage.
-template <typename T> struct is_contiguous : std::false_type {};
-template <typename Char>
-struct is_contiguous<std::basic_string<Char>> : std::true_type {};
-template <typename Char>
-struct is_contiguous<detail::buffer<Char>> : std::true_type {};
+template <typename T> struct formattable : std::false_type {};
 
 namespace detail {
 
+// A workaround for gcc 4.8 to make void_t work in a SFINAE context.
+template <typename... Ts> struct void_t_impl { using type = void; };
+template <typename... Ts>
+using void_t = typename detail::void_t_impl<Ts...>::type;
+
+template <typename It, typename T, typename Enable = void>
+struct is_output_iterator : std::false_type {};
+
+template <typename It, typename T>
+struct is_output_iterator<
+    It, T,
+    void_t<typename std::iterator_traits<It>::iterator_category,
+           decltype(*std::declval<It>() = std::declval<T>())>>
+    : std::true_type {};
+
 template <typename OutputIt>
 struct is_back_insert_iterator : std::false_type {};
 template <typename Container>
@@ -1219,6 +1384,9 @@ struct is_contiguous_back_insert_iterator : std::false_type {};
 template <typename Container>
 struct is_contiguous_back_insert_iterator<std::back_insert_iterator<Container>>
     : is_contiguous<Container> {};
+template <typename Char>
+struct is_contiguous_back_insert_iterator<buffer_appender<Char>>
+    : std::true_type {};
 
 // A type-erased reference to an std::locale to avoid heavy <locale> include.
 class locale_ref {
@@ -1250,13 +1418,24 @@ FMT_CONSTEXPR basic_format_arg<Context> make_arg(const T& value) {
   return arg;
 }
 
+template <typename T> int check(unformattable) {
+  static_assert(
+      formattable<T>(),
+      "Cannot format an argument. To make type T formattable provide a "
+      "formatter<T> specialization: https://fmt.dev/latest/api.html#udt");
+  return 0;
+}
+template <typename T, typename U> inline const U& check(const U& val) {
+  return val;
+}
+
 // The type template parameter is there to avoid an ODR violation when using
 // a fallback formatter in one translation unit and an implicit conversion in
 // another (not recommended).
 template <bool IS_PACKED, typename Context, type, typename T,
           FMT_ENABLE_IF(IS_PACKED)>
 inline value<Context> make_arg(const T& val) {
-  return arg_mapper<Context>().map(val);
+  return check<T>(arg_mapper<Context>().map(val));
 }
 
 template <bool IS_PACKED, typename Context, type, typename T,
@@ -1356,13 +1535,13 @@ template <typename OutputIt, typename Char> class basic_format_context {
 
 template <typename Char>
 using buffer_context =
-    basic_format_context<std::back_insert_iterator<detail::buffer<Char>>, Char>;
+    basic_format_context<detail::buffer_appender<Char>, Char>;
 using format_context = buffer_context<char>;
 using wformat_context = buffer_context<wchar_t>;
 
-// Workaround a bug in gcc: https://stackoverflow.com/q/62767544/471164.
+// Workaround an alias issue: https://stackoverflow.com/q/62767544/471164.
 #define FMT_BUFFER_CONTEXT(Char) \
-  basic_format_context<std::back_insert_iterator<detail::buffer<Char>>, Char>
+  basic_format_context<detail::buffer_appender<Char>, Char>
 
 /**
   \rst
@@ -1414,7 +1593,7 @@ class format_arg_store
 
 /**
   \rst
-  Constructs an `~fmt::format_arg_store` object that contains references to
+  Constructs a `~fmt::format_arg_store` object that contains references to
   arguments and can be implicitly converted to `~fmt::format_args`. `Context`
   can be omitted in which case it defaults to `~fmt::context`.
   See `~fmt::arg` for lifetime considerations.
@@ -1426,6 +1605,27 @@ inline format_arg_store<Context, Args...> make_format_args(
   return {args...};
 }
 
+/**
+  \rst
+  Constructs a `~fmt::format_arg_store` object that contains references
+  to arguments and can be implicitly converted to `~fmt::format_args`.
+  If ``format_str`` is a compile-time string then `make_args_checked` checks
+  its validity at compile time.
+  \endrst
+ */
+template <typename... Args, typename S, typename Char = char_t<S>>
+inline auto make_args_checked(const S& format_str,
+                              const remove_reference_t<Args>&... args)
+    -> format_arg_store<buffer_context<Char>, remove_reference_t<Args>...> {
+  static_assert(
+      detail::count<(
+              std::is_base_of<detail::view, remove_reference_t<Args>>::value &&
+              std::is_reference<Args>::value)...>() == 0,
+      "passing views as lvalues is disallowed");
+  detail::check_format_string<Args...>(format_str);
+  return {args...};
+}
+
 /**
   \rst
   Returns a named argument to be used in a formatting function. It should only
@@ -1713,7 +1913,7 @@ template <typename Context> class basic_format_args {
   }
 
   template <typename Char> int get_id(basic_string_view<Char> name) const {
-    if (!has_named_args()) return {};
+    if (!has_named_args()) return -1;
     const auto& named_args =
         (is_packed() ? values_[-1] : args_[-1].value_).named_args;
     for (size_t i = 0; i < named_args.size; ++i) {
@@ -1729,7 +1929,14 @@ template <typename Context> class basic_format_args {
   }
 };
 
-/** An alias to ``basic_format_args<context>``. */
+#ifdef FMT_ARM_ABI_COMPATIBILITY
+/** An alias to ``basic_format_args<format_context>``. */
+// Separate types would result in shorter symbols but break ABI compatibility
+// between clang and gcc on ARM (#1919).
+using format_args = basic_format_args<format_context>;
+using wformat_args = basic_format_args<wformat_context>;
+#else
+// DEPRECATED! These are kept for ABI compatibility.
 // It is a separate type rather than an alias to make symbols readable.
 struct format_args : basic_format_args<format_context> {
   template <typename... Args>
@@ -1738,32 +1945,10 @@ struct format_args : basic_format_args<format_context> {
 struct wformat_args : basic_format_args<wformat_context> {
   using basic_format_args::basic_format_args;
 };
+#endif
 
 namespace detail {
 
-// Reports a compile-time error if S is not a valid format string.
-template <typename..., typename S, FMT_ENABLE_IF(!is_compile_string<S>::value)>
-FMT_INLINE void check_format_string(const S&) {
-#ifdef FMT_ENFORCE_COMPILE_STRING
-  static_assert(is_compile_string<S>::value,
-                "FMT_ENFORCE_COMPILE_STRING requires all format strings to use "
-                "FMT_STRING.");
-#endif
-}
-template <typename..., typename S, FMT_ENABLE_IF(is_compile_string<S>::value)>
-void check_format_string(S);
-
-template <typename... Args, typename S, typename Char = char_t<S>>
-inline format_arg_store<buffer_context<Char>, remove_reference_t<Args>...>
-make_args_checked(const S& format_str,
-                  const remove_reference_t<Args>&... args) {
-  static_assert(count<(std::is_base_of<view, remove_reference_t<Args>>::value &&
-                       std::is_reference<Args>::value)...>() == 0,
-                "passing views as lvalues is disallowed");
-  check_format_string<Args...>(format_str);
-  return {args...};
-}
-
 template <typename Char, FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
 std::basic_string<Char> vformat(
     basic_string_view<Char> format_str,
@@ -1772,9 +1957,10 @@ std::basic_string<Char> vformat(
 FMT_API std::string vformat(string_view format_str, format_args args);
 
 template <typename Char>
-typename FMT_BUFFER_CONTEXT(Char)::iterator vformat_to(
+void vformat_to(
     buffer<Char>& buf, basic_string_view<Char> format_str,
-    basic_format_args<FMT_BUFFER_CONTEXT(type_identity_t<Char>)> args);
+    basic_format_args<FMT_BUFFER_CONTEXT(type_identity_t<Char>)> args,
+    detail::locale_ref loc = {});
 
 template <typename Char, typename Args,
           FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
@@ -1789,26 +1975,80 @@ inline void vprint_mojibake(std::FILE*, string_view, format_args) {}
 /** Formats a string and writes the output to ``out``. */
 // GCC 8 and earlier cannot handle std::back_insert_iterator<Container> with
 // vformat_to<ArgFormatter>(...) overload, so SFINAE on iterator type instead.
-template <
-    typename OutputIt, typename S, typename Char = char_t<S>,
-    FMT_ENABLE_IF(detail::is_contiguous_back_insert_iterator<OutputIt>::value)>
-OutputIt vformat_to(
-    OutputIt out, const S& format_str,
-    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
-  auto& c = detail::get_container(out);
-  detail::container_buffer<remove_reference_t<decltype(c)>> buf(c);
+template <typename OutputIt, typename S, typename Char = char_t<S>,
+          bool enable = detail::is_output_iterator<OutputIt, Char>::value>
+auto vformat_to(OutputIt out, const S& format_str,
+                basic_format_args<buffer_context<type_identity_t<Char>>> args)
+    -> typename std::enable_if<enable, OutputIt>::type {
+  decltype(detail::get_buffer<Char>(out)) buf(detail::get_buffer_init(out));
   detail::vformat_to(buf, to_string_view(format_str), args);
-  return out;
+  return detail::get_iterator(buf);
 }
 
-template <typename Container, typename S, typename... Args,
-          FMT_ENABLE_IF(
-              is_contiguous<Container>::value&& detail::is_string<S>::value)>
-inline std::back_insert_iterator<Container> format_to(
-    std::back_insert_iterator<Container> out, const S& format_str,
-    Args&&... args) {
-  return vformat_to(out, to_string_view(format_str),
-                    detail::make_args_checked<Args...>(format_str, args...));
+/**
+ \rst
+ Formats arguments, writes the result to the output iterator ``out`` and returns
+ the iterator past the end of the output range.
+
+ **Example**::
+
+   std::vector<char> out;
+   fmt::format_to(std::back_inserter(out), "{}", 42);
+ \endrst
+ */
+// We cannot use FMT_ENABLE_IF because of a bug in gcc 8.3.
+template <typename OutputIt, typename S, typename... Args,
+          bool enable = detail::is_output_iterator<OutputIt, char_t<S>>::value>
+inline auto format_to(OutputIt out, const S& format_str, Args&&... args) ->
+    typename std::enable_if<enable, OutputIt>::type {
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
+  return vformat_to(out, to_string_view(format_str), vargs);
+}
+
+template <typename OutputIt> struct format_to_n_result {
+  /** Iterator past the end of the output range. */
+  OutputIt out;
+  /** Total (not truncated) output size. */
+  size_t size;
+};
+
+template <typename OutputIt, typename Char, typename... Args,
+          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value)>
+inline format_to_n_result<OutputIt> vformat_to_n(
+    OutputIt out, size_t n, basic_string_view<Char> format_str,
+    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
+  detail::iterator_buffer<OutputIt, Char, detail::fixed_buffer_traits> buf(out,
+                                                                           n);
+  detail::vformat_to(buf, format_str, args);
+  return {buf.out(), buf.count()};
+}
+
+/**
+ \rst
+ Formats arguments, writes up to ``n`` characters of the result to the output
+ iterator ``out`` and returns the total output size and the iterator past the
+ end of the output range.
+ \endrst
+ */
+template <typename OutputIt, typename S, typename... Args,
+          bool enable = detail::is_output_iterator<OutputIt, char_t<S>>::value>
+inline auto format_to_n(OutputIt out, size_t n, const S& format_str,
+                        const Args&... args) ->
+    typename std::enable_if<enable, format_to_n_result<OutputIt>>::type {
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
+  return vformat_to_n(out, n, to_string_view(format_str), vargs);
+}
+
+/**
+  Returns the number of characters in the output of
+  ``format(format_str, args...)``.
+ */
+template <typename... Args>
+inline size_t formatted_size(string_view format_str, Args&&... args) {
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
+  detail::counting_buffer<> buf;
+  detail::vformat_to(buf, format_str, vargs);
+  return buf.count();
 }
 
 template <typename S, typename Char = char_t<S>>
@@ -1832,7 +2072,7 @@ FMT_INLINE std::basic_string<Char> vformat(
 // std::basic_string<char_t<S>> to reduce the symbol size.
 template <typename S, typename... Args, typename Char = char_t<S>>
 FMT_INLINE std::basic_string<Char> format(const S& format_str, Args&&... args) {
-  const auto& vargs = detail::make_args_checked<Args...>(format_str, args...);
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
   return detail::vformat(to_string_view(format_str), vargs);
 }
 
@@ -1852,7 +2092,7 @@ FMT_API void vprint(std::FILE*, string_view, format_args);
  */
 template <typename S, typename... Args, typename Char = char_t<S>>
 inline void print(std::FILE* f, const S& format_str, Args&&... args) {
-  const auto& vargs = detail::make_args_checked<Args...>(format_str, args...);
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
   return detail::is_unicode<Char>()
              ? vprint(f, to_string_view(format_str), vargs)
              : detail::vprint_mojibake(f, to_string_view(format_str), vargs);
@@ -1871,7 +2111,7 @@ inline void print(std::FILE* f, const S& format_str, Args&&... args) {
  */
 template <typename S, typename... Args, typename Char = char_t<S>>
 inline void print(const S& format_str, Args&&... args) {
-  const auto& vargs = detail::make_args_checked<Args...>(format_str, args...);
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
   return detail::is_unicode<Char>()
              ? vprint(to_string_view(format_str), vargs)
              : detail::vprint_mojibake(stdout, to_string_view(format_str),

oss/fmt/include/fmt/locale.h

@@ -15,22 +15,12 @@
 FMT_BEGIN_NAMESPACE
 
 namespace detail {
-template <typename Char>
-typename buffer_context<Char>::iterator vformat_to(
-    const std::locale& loc, buffer<Char>& buf,
-    basic_string_view<Char> format_str,
-    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
-  using af = arg_formatter<typename buffer_context<Char>::iterator, Char>;
-  return vformat_to<af>(std::back_inserter(buf), to_string_view(format_str),
-                        args, detail::locale_ref(loc));
-}
-
 template <typename Char>
 std::basic_string<Char> vformat(
     const std::locale& loc, basic_string_view<Char> format_str,
     basic_format_args<buffer_context<type_identity_t<Char>>> args) {
   basic_memory_buffer<Char> buffer;
-  detail::vformat_to(loc, buffer, format_str, args);
+  detail::vformat_to(buffer, format_str, args, detail::locale_ref(loc));
   return fmt::to_string(buffer);
 }
 }  // namespace detail
@@ -45,32 +35,28 @@ inline std::basic_string<Char> vformat(
 template <typename S, typename... Args, typename Char = char_t<S>>
 inline std::basic_string<Char> format(const std::locale& loc,
                                       const S& format_str, Args&&... args) {
-  return detail::vformat(
-      loc, to_string_view(format_str),
-      detail::make_args_checked<Args...>(format_str, args...));
+  return detail::vformat(loc, to_string_view(format_str),
+                         fmt::make_args_checked<Args...>(format_str, args...));
 }
 
 template <typename S, typename OutputIt, typename... Args,
-          typename Char = enable_if_t<
-              detail::is_output_iterator<OutputIt>::value, char_t<S>>>
+          typename Char = char_t<S>,
+          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value)>
 inline OutputIt vformat_to(
     OutputIt out, const std::locale& loc, const S& format_str,
-    format_args_t<type_identity_t<OutputIt>, Char> args) {
-  using af = detail::arg_formatter<OutputIt, Char>;
-  return vformat_to<af>(out, to_string_view(format_str), args,
-                        detail::locale_ref(loc));
+    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
+  decltype(detail::get_buffer<Char>(out)) buf(detail::get_buffer_init(out));
+  vformat_to(buf, to_string_view(format_str), args, detail::locale_ref(loc));
+  return detail::get_iterator(buf);
 }
 
 template <typename OutputIt, typename S, typename... Args,
-          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt>::value&&
-                            detail::is_string<S>::value)>
-inline OutputIt format_to(OutputIt out, const std::locale& loc,
-                          const S& format_str, Args&&... args) {
-  detail::check_format_string<Args...>(format_str);
-  using context = format_context_t<OutputIt, char_t<S>>;
-  format_arg_store<context, Args...> as{args...};
-  return vformat_to(out, loc, to_string_view(format_str),
-                    basic_format_args<context>(as));
+          bool enable = detail::is_output_iterator<OutputIt, char_t<S>>::value>
+inline auto format_to(OutputIt out, const std::locale& loc,
+                      const S& format_str, Args&&... args) ->
+    typename std::enable_if<enable, OutputIt>::type {
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
+  return vformat_to(out, loc, to_string_view(format_str), vargs);
 }
 
 FMT_END_NAMESPACE

oss/fmt/include/fmt/os.h

@@ -29,7 +29,8 @@
 #if FMT_HAS_INCLUDE("winapifamily.h")
 #  include <winapifamily.h>
 #endif
-#if FMT_HAS_INCLUDE("fcntl.h") && \
+#if (FMT_HAS_INCLUDE(<fcntl.h>) || defined(__APPLE__) || \
+     defined(__linux__)) &&                              \
     (!defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP))
 #  include <fcntl.h>  // for O_RDONLY
 #  define FMT_USE_FCNTL 1
@@ -278,7 +279,8 @@ class file {
     RDONLY = FMT_POSIX(O_RDONLY),  // Open for reading only.
     WRONLY = FMT_POSIX(O_WRONLY),  // Open for writing only.
     RDWR = FMT_POSIX(O_RDWR),      // Open for reading and writing.
-    CREATE = FMT_POSIX(O_CREAT)    // Create if the file doesn't exist.
+    CREATE = FMT_POSIX(O_CREAT),   // Create if the file doesn't exist.
+    APPEND = FMT_POSIX(O_APPEND)   // Open in append mode.
   };
 
   // Constructs a file object which doesn't represent any file.
@@ -343,36 +345,69 @@ class file {
 // Returns the memory page size.
 long getpagesize();
 
-class direct_buffered_file;
+namespace detail {
 
-template <typename S, typename... Args>
-void print(direct_buffered_file& f, const S& format_str,
-           const Args&... args);
+struct buffer_size {
+  size_t value = 0;
+  buffer_size operator=(size_t val) const {
+    auto bs = buffer_size();
+    bs.value = val;
+    return bs;
+  }
+};
 
-// A buffered file with a direct buffer access and no synchronization.
-class direct_buffered_file {
+struct ostream_params {
+  int oflag = file::WRONLY | file::CREATE;
+  size_t buffer_size = BUFSIZ > 32768 ? BUFSIZ : 32768;
+
+  ostream_params() {}
+
+  template <typename... T>
+  ostream_params(T... params, int oflag) : ostream_params(params...) {
+    this->oflag = oflag;
+  }
+
+  template <typename... T>
+  ostream_params(T... params, detail::buffer_size bs)
+      : ostream_params(params...) {
+    this->buffer_size = bs.value;
+  }
+};
+}  // namespace detail
+
+static constexpr detail::buffer_size buffer_size;
+
+// A fast output stream which is not thread-safe.
+class ostream final : private detail::buffer<char> {
  private:
   file file_;
 
-  enum { buffer_size = 4096 };
-  char buffer_[buffer_size];
-  int pos_;
-
   void flush() {
-    if (pos_ == 0) return;
-    file_.write(buffer_, pos_);
-    pos_ = 0;
+    if (size() == 0) return;
+    file_.write(data(), size());
+    clear();
   }
 
-  int free_capacity() const { return buffer_size - pos_; }
+  FMT_API void grow(size_t) override final;
+
+  ostream(cstring_view path, const detail::ostream_params& params)
+      : file_(path, params.oflag) {
+    set(new char[params.buffer_size], params.buffer_size);
+  }
 
  public:
-  direct_buffered_file(cstring_view path, int oflag)
-    : file_(path, oflag), pos_(0) {}
-
-  ~direct_buffered_file() {
-    flush();
+  ostream(ostream&& other)
+      : detail::buffer<char>(other.data(), other.size(), other.capacity()),
+        file_(std::move(other.file_)) {
+    other.set(nullptr, 0);
   }
+  ~ostream() {
+    flush();
+    delete[] data();
+  }
+
+  template <typename... T>
+  friend ostream output_file(cstring_view path, T... params);
 
   void close() {
     flush();
@@ -380,25 +415,20 @@ class direct_buffered_file {
   }
 
   template <typename S, typename... Args>
-  friend void print(direct_buffered_file& f, const S& format_str,
-                    const Args&... args) {
-    // We could avoid double buffering.
-    auto buf = fmt::memory_buffer();
-    fmt::format_to(std::back_inserter(buf), format_str, args...);
-    auto remaining_pos = 0;
-    auto remaining_size = buf.size();
-    while (remaining_size > detail::to_unsigned(f.free_capacity())) {
-      auto size = f.free_capacity();
-      memcpy(f.buffer_ + f.pos_, buf.data() + remaining_pos, size);
-      f.pos_ += size;
-      f.flush();
-      remaining_pos += size;
-      remaining_size -= size;
-    }
-    memcpy(f.buffer_ + f.pos_, buf.data() + remaining_pos, remaining_size);
-    f.pos_ += static_cast<int>(remaining_size);
+  void print(const S& format_str, const Args&... args) {
+    format_to(detail::buffer_appender<char>(*this), format_str, args...);
   }
 };
+
+/**
+  Opens a file for writing. Supported parameters passed in `params`:
+  * ``<integer>``: Output flags (``file::WRONLY | file::CREATE`` by default)
+  * ``buffer_size=<integer>``: Output buffer size
+ */
+template <typename... T>
+inline ostream output_file(cstring_view path, T... params) {
+  return {path, detail::ostream_params(params...)};
+}
 #endif  // FMT_USE_FCNTL
 
 #ifdef FMT_LOCALE

oss/fmt/include/fmt/ostream.h

@@ -49,17 +49,27 @@ template <class Char> class formatbuf : public std::basic_streambuf<Char> {
   }
 };
 
+struct converter {
+  template <typename T, FMT_ENABLE_IF(is_integral<T>::value)> converter(T);
+};
+
 template <typename Char> struct test_stream : std::basic_ostream<Char> {
  private:
-  // Hide all operator<< from std::basic_ostream<Char>.
-  void_t<> operator<<(null<>);
-  void_t<> operator<<(const Char*);
-
-  template <typename T, FMT_ENABLE_IF(std::is_convertible<T, int>::value &&
-                                      !std::is_enum<T>::value)>
-  void_t<> operator<<(T);
+  void_t<> operator<<(converter);
 };
 
+// Hide insertion operators for built-in types.
+template <typename Char, typename Traits>
+void_t<> operator<<(std::basic_ostream<Char, Traits>&, Char);
+template <typename Char, typename Traits>
+void_t<> operator<<(std::basic_ostream<Char, Traits>&, char);
+template <typename Traits>
+void_t<> operator<<(std::basic_ostream<char, Traits>&, char);
+template <typename Traits>
+void_t<> operator<<(std::basic_ostream<char, Traits>&, signed char);
+template <typename Traits>
+void_t<> operator<<(std::basic_ostream<char, Traits>&, unsigned char);
+
 // Checks if T has a user-defined operator<< (e.g. not a member of
 // std::ostream).
 template <typename T, typename Char> class is_streamable {
@@ -103,7 +113,7 @@ void format_value(buffer<Char>& buf, const T& value,
 #endif
   output << value;
   output.exceptions(std::ios_base::failbit | std::ios_base::badbit);
-  buf.resize(buf.size());
+  buf.try_resize(buf.size());
 }
 
 // Formats an object of type T that has an overloaded ostream operator<<.
@@ -160,7 +170,7 @@ template <typename S, typename... Args,
           typename Char = enable_if_t<detail::is_string<S>::value, char_t<S>>>
 void print(std::basic_ostream<Char>& os, const S& format_str, Args&&... args) {
   vprint(os, to_string_view(format_str),
-         detail::make_args_checked<Args...>(format_str, args...));
+         fmt::make_args_checked<Args...>(format_str, args...));
 }
 FMT_END_NAMESPACE
 

oss/fmt/include/fmt/printf.h

@@ -181,7 +181,7 @@ template <typename Char> class printf_width_handler {
 template <typename Char, typename Context>
 void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
              basic_format_args<Context> args) {
-  Context(std::back_inserter(buf), format, args).format();
+  Context(buffer_appender<Char>(buf), format, args).format();
 }
 }  // namespace detail
 
@@ -598,7 +598,7 @@ OutputIt basic_printf_context<OutputIt, Char>::format() {
 
 template <typename Char>
 using basic_printf_context_t =
-    basic_printf_context<std::back_insert_iterator<detail::buffer<Char>>, Char>;
+    basic_printf_context<detail::buffer_appender<Char>, Char>;
 
 using printf_context = basic_printf_context_t<char>;
 using wprintf_context = basic_printf_context_t<wchar_t>;

oss/fmt/include/fmt/ranges.h

@@ -157,6 +157,9 @@ template <class Tuple, class F> void for_each(Tuple&& tup, F&& f) {
   for_each(indexes, std::forward<Tuple>(tup), std::forward<F>(f));
 }
 
+template <typename Range>
+using value_type = remove_cvref_t<decltype(*std::declval<Range>().begin())>;
+
 template <typename Arg, FMT_ENABLE_IF(!is_like_std_string<
                                       typename std::decay<Arg>::type>::value)>
 FMT_CONSTEXPR const char* format_str_quoted(bool add_space, const Arg&) {
@@ -182,7 +185,6 @@ FMT_CONSTEXPR const char* format_str_quoted(bool add_space, const char) {
 FMT_CONSTEXPR const wchar_t* format_str_quoted(bool add_space, const wchar_t) {
   return add_space ? L" '{}'" : L"'{}'";
 }
-
 }  // namespace detail
 
 template <typename T> struct is_tuple_like {
@@ -246,9 +248,18 @@ template <typename T, typename Char> struct is_range {
       !std::is_constructible<detail::std_string_view<Char>, T>::value;
 };
 
-template <typename RangeT, typename Char>
-struct formatter<RangeT, Char,
-                 enable_if_t<fmt::is_range<RangeT, Char>::value>> {
+template <typename T, typename Char>
+struct formatter<
+    T, Char,
+    enable_if_t<fmt::is_range<T, Char>::value
+// Workaround a bug in MSVC 2017 and earlier.
+#if !FMT_MSC_VER || FMT_MSC_VER >= 1927
+                &&
+                (has_formatter<detail::value_type<T>, format_context>::value ||
+                 detail::has_fallback_formatter<detail::value_type<T>,
+                                                format_context>::value)
+#endif
+                >> {
   formatting_range<Char> formatting;
 
   template <typename ParseContext>
@@ -257,8 +268,7 @@ struct formatter<RangeT, Char,
   }
 
   template <typename FormatContext>
-  typename FormatContext::iterator format(const RangeT& values,
-                                          FormatContext& ctx) {
+  typename FormatContext::iterator format(const T& values, FormatContext& ctx) {
     auto out = detail::copy(formatting.prefix, ctx.out());
     size_t i = 0;
     auto it = values.begin();

oss/fmt/src/format.cc

@@ -23,6 +23,36 @@ int format_float(char* buf, std::size_t size, const char* format, int precision,
   return precision < 0 ? snprintf_ptr(buf, size, format, value)
                        : snprintf_ptr(buf, size, format, precision, value);
 }
+
+template FMT_API dragonbox::decimal_fp<float> dragonbox::to_decimal(float x)
+    FMT_NOEXCEPT;
+template FMT_API dragonbox::decimal_fp<double> dragonbox::to_decimal(double x)
+    FMT_NOEXCEPT;
+
+// DEPRECATED! This function exists for ABI compatibility.
+template <typename Char>
+typename basic_format_context<std::back_insert_iterator<buffer<Char>>,
+                              Char>::iterator
+vformat_to(buffer<Char>& buf, basic_string_view<Char> format_str,
+           basic_format_args<basic_format_context<
+               std::back_insert_iterator<buffer<type_identity_t<Char>>>,
+               type_identity_t<Char>>>
+               args) {
+  using iterator = std::back_insert_iterator<buffer<char>>;
+  using context = basic_format_context<
+      std::back_insert_iterator<buffer<type_identity_t<Char>>>,
+      type_identity_t<Char>>;
+  auto out = iterator(buf);
+  format_handler<iterator, Char, context> h(out, format_str, args, {});
+  parse_format_string<false>(format_str, h);
+  return out;
+}
+template basic_format_context<std::back_insert_iterator<buffer<char>>,
+                              char>::iterator
+vformat_to(buffer<char>&, string_view,
+           basic_format_args<basic_format_context<
+               std::back_insert_iterator<buffer<type_identity_t<char>>>,
+               type_identity_t<char>>>);
 }  // namespace detail
 
 template struct FMT_INSTANTIATION_DEF_API detail::basic_data<void>;
@@ -44,9 +74,9 @@ template FMT_API char detail::decimal_point_impl(locale_ref);
 
 template FMT_API void detail::buffer<char>::append(const char*, const char*);
 
-template FMT_API FMT_BUFFER_CONTEXT(char)::iterator detail::vformat_to(
+template FMT_API void detail::vformat_to(
     detail::buffer<char>&, string_view,
-    basic_format_args<FMT_BUFFER_CONTEXT(char)>);
+    basic_format_args<FMT_BUFFER_CONTEXT(char)>, detail::locale_ref);
 
 template FMT_API int detail::snprintf_float(double, int, detail::float_specs,
                                             detail::buffer<char>&);

oss/fmt/src/os.cc

@@ -62,7 +62,7 @@ using RWResult = int;
 inline unsigned convert_rwcount(std::size_t count) {
   return count <= UINT_MAX ? static_cast<unsigned>(count) : UINT_MAX;
 }
-#else
+#elif FMT_USE_FCNTL
 // Return type of read and write functions.
 using RWResult = ssize_t;
 
@@ -124,7 +124,8 @@ void detail::format_windows_error(detail::buffer<char>& out, int error_code,
       if (result != 0) {
         utf16_to_utf8 utf8_message;
         if (utf8_message.convert(system_message) == ERROR_SUCCESS) {
-          format_to(std::back_inserter(out), "{}: {}", message, utf8_message);
+          format_to(buffer_appender<char>(out), "{}: {}", message,
+                    utf8_message);
           return;
         }
         break;
@@ -288,12 +289,12 @@ void file::pipe(file& read_end, file& write_end) {
 }
 
 buffered_file file::fdopen(const char* mode) {
-  // Don't retry as fdopen doesn't return EINTR.
-  #if defined(__MINGW32__) && defined(_POSIX_)
+// Don't retry as fdopen doesn't return EINTR.
+#  if defined(__MINGW32__) && defined(_POSIX_)
   FILE* f = ::fdopen(fd_, mode);
-  #else
+#  else
   FILE* f = FMT_POSIX_CALL(fdopen(fd_, mode));
-  #endif
+#  endif
   if (!f)
     FMT_THROW(
         system_error(errno, "cannot associate stream with file descriptor"));
@@ -313,5 +314,9 @@ long getpagesize() {
   return size;
 #  endif
 }
+
+FMT_API void ostream::grow(size_t) {
+  if (this->size() == this->capacity()) flush();
+}
 #endif  // FMT_USE_FCNTL
 FMT_END_NAMESPACE

res/README.md

@@ -6,16 +6,3 @@ The images in this directory do not fall under the same [license](https://raw.gi
 of the Windows Terminal code.
 
 Please consult the [license](./LICENSE) in this directory for terms applicable to the image assets in this directory.
-
-## Fonts
-
-The fonts in this directory do not fall under the same [license](https://raw.githubusercontent.com/microsoft/terminal/main/LICENSE) as the rest
-of the Windows Terminal code.
-
-Please consult the [license](https://raw.githubusercontent.com/microsoft/cascadia-code/main/LICENSE) in the
-[microsoft/cascadia-code](https://github.com/microsoft/cascadia-code) repository for terms applicable to the fonts in this directory.
-
-### Fonts Included
-
-* Cascadia Code, Cascadia Mono (2102.25)
-   * from microsoft/cascadia-code@911dc421f333e3b72b97381d16fee5b71eb48f04

res/fonts/README.md

@@ -0,0 +1,12 @@
+# Windows Terminal and Console Assets (Fonts)
+
+The fonts in this directory do not fall under the same [license](https://raw.githubusercontent.com/microsoft/terminal/main/LICENSE) as the rest
+of the Windows Terminal code.
+
+Please consult the [license](https://raw.githubusercontent.com/microsoft/cascadia-code/main/LICENSE) in the
+[microsoft/cascadia-code](https://github.com/microsoft/cascadia-code) repository for terms applicable to the fonts in this directory.
+
+### Fonts Included
+
+* Cascadia Code, Cascadia Mono (2106.17)
+   * from microsoft/cascadia-code@fb0bce69c1c12f6c298b8bc1c1d181868f5daa9a

samples/ConPTY/GUIConsole/GUIConsole.WPF/App.xaml

@@ -1,8 +1,6 @@
-<Application x:Class="GUIConsole.Wpf.App"
-             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             StartupUri="MainWindow.xaml">
-    <Application.Resources>
-         
-    </Application.Resources>
-</Application>
+<Application x:Class="GUIConsole.Wpf.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources />
+</Application>

samples/ConPTY/GUIConsole/GUIConsole.WPF/MainWindow.xaml

@@ -1,84 +1,100 @@
-<Window x:Class="GUIConsole.Wpf.MainWindow"
-        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        mc:Ignorable="d"
-        
-        Title="MainWindow" Height="450" Width="800"
-        Background="#C7000000"
-        AllowsTransparency="True"
-        WindowStyle="None"
-        MouseDown="Window_MouseDown"
-        BorderThickness="1"
-        BorderBrush="LightSlateGray"
-        
-        KeyDown="Window_KeyDown"
-        Loaded="Window_Loaded">
-    <Window.Resources>
-        <Style x:Key="TitleBarButtonStyle" TargetType="{x:Type Button}">
-            <Setter Property="Background" Value="Transparent"/>
-            <Setter Property="FontFamily" Value="Segoe MDL2 Assets"/>
-            <Setter Property="FontSize" Value="14"/>
-            <Setter Property="Height" Value="32"/>
-            <Setter Property="Width" Value="46"/>
-            <Setter Property="Background" Value="Transparent"/>
-            <Setter Property="Foreground" Value="White"/>
-            <Setter Property="BorderThickness" Value="0"/>
-        </Style>
-
-        <Style x:Key="CloseButtonStyle" TargetType="{x:Type Button}" BasedOn="{StaticResource TitleBarButtonStyle}">
-            <Setter Property="Content" Value="&#xE10A;"/>
-            <!--Remove the default Button template's Triggers, otherwise they'll override our trigger below.-->
-            <Setter Property="Template">
-                <Setter.Value>
-                    <ControlTemplate TargetType="{x:Type Button}">
-                        <Border Background="{TemplateBinding Background}">
-                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
-                        </Border>
-                    </ControlTemplate>
-                </Setter.Value>
-            </Setter>
-            <Style.Triggers>
-                <Trigger Property="IsMouseOver" Value="True">
-                    <Setter Property="Button.Background" Value="Red"/>
-                </Trigger>
-            </Style.Triggers>
-        </Style>
-    </Window.Resources>
-    
-    <Grid>
-        <Grid.RowDefinitions>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="*"/>
-        </Grid.RowDefinitions>
-
-        <Grid Grid.Row="0">
-            <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="*"/>
-                <ColumnDefinition Width="Auto"/>
-            </Grid.ColumnDefinitions>
-            <TextBlock x:Name="TitleBarTitle" Grid.Column="0" VerticalAlignment="Center" Padding="10 0" Foreground="White">
-                GUIConsole
-            </TextBlock>
-            <StackPanel x:Name="TitleBarButtons" Grid.Column="1" Orientation="Horizontal" VerticalAlignment="Top">
-                <Button x:Name="MinimizeButton"
-                        Click="MinimizeButton_Click"
-                        Content="&#xE108;"
-                        Style="{StaticResource TitleBarButtonStyle}"/>
-                <Button x:Name="MaximizeRestoreButton"
-                        Click="MaximizeRestoreButton_Click"
-                        Content="&#xE922;"
-                        FontSize="12"
-                        Style="{StaticResource TitleBarButtonStyle}"/>
-                <Button x:Name="CloseButton"
-                        Click="CloseButton_Click" 
-                        FontSize="12"
-                        Style="{StaticResource CloseButtonStyle}"/>
-            </StackPanel>
-        </Grid>
-        <ScrollViewer x:Name="TerminalHistoryViewer" Grid.Row="1" ScrollChanged="ScrollViewer_ScrollChanged">
-            <TextBlock x:Name="TerminalHistoryBlock" FontFamily="Consolas" TextWrapping="Wrap" Foreground="White"/>
-        </ScrollViewer>
-    </Grid>
-</Window>
+<Window x:Class="GUIConsole.Wpf.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        Title="MainWindow"
+        Width="800"
+        Height="450"
+        AllowsTransparency="True"
+        Background="#C7000000"
+        BorderBrush="LightSlateGray"
+        BorderThickness="1"
+        KeyDown="Window_KeyDown"
+        Loaded="Window_Loaded"
+        MouseDown="Window_MouseDown"
+        WindowStyle="None"
+        mc:Ignorable="d">
+    <Window.Resources>
+        <Style x:Key="TitleBarButtonStyle"
+               TargetType="{x:Type Button}">
+            <Setter Property="Background" Value="Transparent" />
+            <Setter Property="FontFamily" Value="Segoe MDL2 Assets" />
+            <Setter Property="FontSize" Value="14" />
+            <Setter Property="Height" Value="32" />
+            <Setter Property="Width" Value="46" />
+            <Setter Property="Background" Value="Transparent" />
+            <Setter Property="Foreground" Value="White" />
+            <Setter Property="BorderThickness" Value="0" />
+        </Style>
+
+        <Style x:Key="CloseButtonStyle"
+               BasedOn="{StaticResource TitleBarButtonStyle}"
+               TargetType="{x:Type Button}">
+            <Setter Property="Content" Value="&#xE10A;" />
+            <!--  Remove the default Button template's Triggers, otherwise they'll override our trigger below.  -->
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="{x:Type Button}">
+                        <Border Background="{TemplateBinding Background}">
+                            <ContentPresenter HorizontalAlignment="Center"
+                                              VerticalAlignment="Center" />
+                        </Border>
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+            <Style.Triggers>
+                <Trigger Property="IsMouseOver" Value="True">
+                    <Setter Property="Button.Background" Value="Red" />
+                </Trigger>
+            </Style.Triggers>
+        </Style>
+    </Window.Resources>
+
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+
+        <Grid Grid.Row="0">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*" />
+                <ColumnDefinition Width="Auto" />
+            </Grid.ColumnDefinitions>
+            <TextBlock x:Name="TitleBarTitle"
+                       Grid.Column="0"
+                       Padding="10,0"
+                       VerticalAlignment="Center"
+                       Foreground="White">
+                GUIConsole
+            </TextBlock>
+            <StackPanel x:Name="TitleBarButtons"
+                        Grid.Column="1"
+                        VerticalAlignment="Top"
+                        Orientation="Horizontal">
+                <Button x:Name="MinimizeButton"
+                        Click="MinimizeButton_Click"
+                        Content="&#xE108;"
+                        Style="{StaticResource TitleBarButtonStyle}" />
+                <Button x:Name="MaximizeRestoreButton"
+                        Click="MaximizeRestoreButton_Click"
+                        Content="&#xE922;"
+                        FontSize="12"
+                        Style="{StaticResource TitleBarButtonStyle}" />
+                <Button x:Name="CloseButton"
+                        Click="CloseButton_Click"
+                        FontSize="12"
+                        Style="{StaticResource CloseButtonStyle}" />
+            </StackPanel>
+        </Grid>
+        <ScrollViewer x:Name="TerminalHistoryViewer"
+                      Grid.Row="1"
+                      ScrollChanged="ScrollViewer_ScrollChanged">
+            <TextBlock x:Name="TerminalHistoryBlock"
+                       FontFamily="Consolas"
+                       Foreground="White"
+                       TextWrapping="Wrap" />
+        </ScrollViewer>
+    </Grid>
+</Window>

samples/PixelShaders/Outlines.hlsl

@@ -0,0 +1,66 @@
+// A minimal pixel shader that outlines text
+
+// The terminal graphics as a texture
+Texture2D shaderTexture;
+SamplerState samplerState;
+
+// Terminal settings such as the resolution of the texture
+cbuffer PixelShaderSettings {
+  // The number of seconds since the pixel shader was enabled
+  float  Time;
+  // UI Scale
+  float  Scale;
+  // Resolution of the shaderTexture
+  float2 Resolution;
+  // Background color as rgba
+  float4 Background;
+};
+
+// A pixel shader is a program that given a texture coordinate (tex) produces a color.
+// tex is an x,y tuple that ranges from 0,0 (top left) to 1,1 (bottom right).
+// Just ignore the pos parameter.
+float4 main(float4 pos : SV_POSITION, float2 tex : TEXCOORD) : SV_TARGET
+{
+    // Read the color value at the current texture coordinate (tex)
+    //  float4 is tuple of 4 floats, rgba
+    float4 color = shaderTexture.Sample(samplerState, tex);
+
+    // Read the color value at some offset, will be used as shadow. For the best
+    // effect, read the colors offset on the left, right, top, bottom of this
+    // fragment, as well as on the corners of this fragment.
+    //
+    // You could get away with fewer samples, but the resulting outlines will be
+    // blurrier.
+
+    //left, right, top, bottom:
+    float4 leftColor   = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 1.0,  0.0)/Resolution.y);
+    float4 rightColor  = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2(-1.0,  0.0)/Resolution.y);
+    float4 topColor    = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 0.0,  1.0)/Resolution.y);
+    float4 bottomColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 0.0, -1.0)/Resolution.y);
+
+    // Corners
+    float4 topLeftColor     = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 1.0,  1.0)/Resolution.y);
+    float4 topRightColor    = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2(-1.0,  1.0)/Resolution.y);
+    float4 bottomLeftColor  = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2( 1.0, -1.0)/Resolution.y);
+    float4 bottomRightColor = shaderTexture.Sample(samplerState, tex+1.0*Scale*float2(-1.0, -1.0)/Resolution.y);
+
+
+    // Now, if any of those adjacent cells has text in it, then the *color vec4
+    // will have a non-zero .w (which is used for alpha). Use that alpha value
+    // to add some black to the current fragment.
+    //
+    // This will result in only coloring fragments adjacent to text, but leaving
+    // background images (for example) untouched.
+    float3 outlineColor = float3(0, 0, 0);
+    float4 result = color;
+    result = result + float4(outlineColor, leftColor.w);
+    result = result + float4(outlineColor, rightColor.w);
+    result = result + float4(outlineColor, topColor.w);
+    result = result + float4(outlineColor, bottomColor.w);
+
+    result = result + float4(outlineColor, topLeftColor.w);
+    result = result + float4(outlineColor, topRightColor.w);
+    result = result + float4(outlineColor, bottomLeftColor.w);
+    result = result + float4(outlineColor, bottomRightColor.w);
+    return result;
+}

src/ConsolePerf.wprp

@@ -43,6 +43,7 @@
         <EventProvider Id="EventProvider-Microsoft.Windows.Console.Server" Name="1A541C01-589A-496E-85A7-A9E02170166D"/>
         <EventProvider Id="EventProvider-Microsoft.Windows.Console.VirtualTerminal.Parser" Name="c9ba2a84-d3ca-5e19-2bd6-776a0910cb9d"/>
         <EventProvider Id="EventProvider-Microsoft.Windows.Console.Render.VtEngine" Name="c9ba2a95-d3ca-5e19-2bd6-776a0910cb9d"/>
+        <EventProvider Id="EventProvider-Microsoft.Windows.Console.UIA" Name="e7ebce59-2161-572d-b263-2f16a6afb9e5"/>
         <!-- Now define some profiles. We'll call them by ID when collecting. Also, the Base is where it is inheriting from and is a .wprpi file built... -->
         <!-- ... into WPR automatically. Go look in the WPR install directory or in the documentation to find it. -->
         <Profile Id="ConsolePerfProfile.Verbose.File" Base="GeneralProfile.Light.File" LoggingMode="File" Name="ConsolePerfProfile" DetailLevel="Verbose" Description="Console Performance default profile">
@@ -66,6 +67,7 @@
                         <EventProviderId Value="EventProvider-Microsoft.Windows.Console.Server"/>
                         <EventProviderId Value="EventProvider-Microsoft.Windows.Console.VirtualTerminal.Parser"/>
                         <EventProviderId Value="EventProvider-Microsoft.Windows.Console.Render.VtEngine"/>
+                        <EventProviderId Value="EventProvider-Microsoft.Windows.Console.UIA"/>
                     </EventProviders>
                 </EventCollectorId>
             </Collectors>

src/Terminal.wprp

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<WindowsPerformanceRecorder Version="1.0" Author="Microsoft Corporation" Copyright="Microsoft Corporation" Company="Microsoft Corporation">
+  <Profiles>
+    <EventCollector Id="EventCollector_Terminal" Name="Terminal">
+      <BufferSize Value="64" />
+      <Buffers Value="4" />
+    </EventCollector>
+    <EventProvider Id="EventProvider_TerminalControl" Name="28c82e50-57af-5a86-c25b-e39cd990032b" />
+    <EventProvider Id="EventProvider_TerminalConnection" Name="e912fe7b-eeb6-52a5-c628-abe388e5f792" />
+    <EventProvider Id="EventProvider_TerminalSettingsModel" Name="be579944-4d33-5202-e5d6-a7a57f1935cb" />
+    <EventProvider Id="EventProvider_TerminalApp" Name="24a1622f-7da7-5c77-3303-d850bd1ab2ed" />
+    <EventProvider Id="EventProvider_TerminalWin32Host" Name="56c06166-2e2e-5f4d-7ff3-74f4b78c87d6" />
+    <EventProvider Id="EventProvider_TerminalRemoting" Name="d6f04aad-629f-539a-77c1-73f5c3e4aa7b" />
+    <EventProvider Id="EventProvider_TerminalDirectX" Name="c93e739e-ae50-5a14-78e7-f171e947535d" />
+    <Profile Id="Terminal.Verbose.File" Name="Terminal" Description="Terminal" LoggingMode="File" DetailLevel="Verbose">
+      <Collectors>
+        <EventCollectorId Value="EventCollector_Terminal">
+          <EventProviders>
+            <EventProviderId Value="EventProvider_TerminalControl" />
+            <EventProviderId Value="EventProvider_TerminalConnection" />
+            <EventProviderId Value="EventProvider_TerminalSettingsModel" />
+            <EventProviderId Value="EventProvider_TerminalApp" />
+            <EventProviderId Value="EventProvider_TerminalWin32Host" />
+            <EventProviderId Value="EventProvider_TerminalRemoting" />
+            <EventProviderId Value="EventProvider_TerminalDirectX" />
+          </EventProviders>
+        </EventCollectorId>
+      </Collectors>
+    </Profile>
+    <Profile Id="Terminal.Light.File" Name="Terminal" Description="Terminal" Base="Terminal.Verbose.File" LoggingMode="File" DetailLevel="Light" />
+    <Profile Id="Terminal.Verbose.Memory" Name="Terminal" Description="Terminal" Base="Terminal.Verbose.File" LoggingMode="Memory" DetailLevel="Verbose" />
+    <Profile Id="Terminal.Light.Memory" Name="Terminal" Description="Terminal" Base="Terminal.Verbose.File" LoggingMode="Memory" DetailLevel="Light" />
+  </Profiles>
+</WindowsPerformanceRecorder>

src/buffer/out/textBuffer.cpp

@@ -281,9 +281,9 @@ bool TextBuffer::_AssertValidDoubleByteSequence(const DbcsAttribute dbcsAttribut
 // - false otherwise (out of memory)
 bool TextBuffer::_PrepareForDoubleByteSequence(const DbcsAttribute dbcsAttribute)
 {
-    // Assert the buffer state is ready for this character
-    // This function corrects most errors. If this is false, we had an uncorrectable one.
-    FAIL_FAST_IF(!(_AssertValidDoubleByteSequence(dbcsAttribute))); // Shouldn't be uncorrectable sequences unless something is very wrong.
+    // This function corrects most errors. If this is false, we had an uncorrectable one which
+    // older versions of conhost simply let pass by unflinching.
+    LOG_HR_IF(E_NOT_VALID_STATE, !(_AssertValidDoubleByteSequence(dbcsAttribute))); // Shouldn't be uncorrectable sequences unless something is very wrong.
 
     bool fSuccess = true;
     // Now compensate if we don't have enough space for the upcoming double byte sequence

src/cascadia/CascadiaPackage/CascadiaPackage.wapproj

@@ -70,6 +70,7 @@
   <ItemGroup>
     <ProjectReference Include="..\WindowsTerminal\WindowsTerminal.vcxproj" />
     <ProjectReference Include="..\..\host\exe\Host.EXE.vcxproj" />
+    <ProjectReference Include="..\..\host\proxy\Host.Proxy.vcxproj" />
     <ProjectReference Include="..\TerminalAzBridge\TerminalAzBridge.vcxproj" />
     <ProjectReference Include="..\ShellExtension\WindowsTerminalShellExt.vcxproj" />
     <ProjectReference Include="..\wt\wt.vcxproj" />

src/cascadia/CascadiaPackage/Package-Dev.appxmanifest

@@ -54,7 +54,6 @@
             <uap:ShowOn Tile="square310x310Logo"/>
           </uap:ShowNameOnTiles>
         </uap:DefaultTile>
-        <uap:SplashScreen Image="Images\SplashScreen.png"/>
       </uap:VisualElements>
 
       <Extensions>
@@ -74,21 +73,55 @@
                 <uap3:Name>com.microsoft.windows.terminal.settings</uap3:Name>
               </uap3:AppExtensionHost>
         </uap3:Extension>
-
+        <uap3:Extension Category="windows.appExtension">
+            <uap3:AppExtension Name="com.microsoft.windows.console.host"
+                Id="OpenConsole-Dev"
+                DisplayName="OpenConsole Dev"
+                Description="Console host built from microsoft/terminal open source repository"
+                PublicFolder="Public">
+                <uap3:Properties>
+                    <Clsid>{1F9F2BF5-5BC3-4F17-B0E6-912413F1F451}</Clsid>
+                </uap3:Properties>
+            </uap3:AppExtension>
+        </uap3:Extension>
+        <uap3:Extension Category="windows.appExtension">
+            <uap3:AppExtension Name="com.microsoft.windows.terminal.host"
+                Id="Terminal-Dev"
+                DisplayName="Windows Terminal Dev"
+                Description="Terminal host built from microsoft/terminal open source repository"
+                PublicFolder="Public">
+                <uap3:Properties>
+                    <Clsid>{051F34EE-C1FD-4B19-AF75-9BA54648434C}</Clsid>
+                </uap3:Properties>
+            </uap3:AppExtension>
+        </uap3:Extension>
+        <com:Extension Category="windows.comInterface">
+            <com:ComInterface>
+                <com:ProxyStub Id="DEC4804D-56D1-4F73-9FBE-6828E7C85C56" DisplayName="OpenConsoleHandoffProxy" Path="OpenConsoleProxy.dll"/>
+                <com:Interface Id="2B607BC1-43EB-40C3-95AE-2856ADDB7F23" ProxyStubClsid="DEC4804D-56D1-4F73-9FBE-6828E7C85C56"/>
+                <com:Interface Id="FA1E3AB4-9AEC-4A3C-96CA-E6078C30BD74" ProxyStubClsid="DEC4804D-56D1-4F73-9FBE-6828E7C85C56"/>
+            </com:ComInterface>
+        </com:Extension>
         <com:Extension Category="windows.comServer">
             <com:ComServer>
+                <com:ExeServer DisplayName="OpenConsole" Executable="OpenConsole.exe">
+                    <com:Class Id="1F9F2BF5-5BC3-4F17-B0E6-912413F1F451"/>
+                </com:ExeServer>
+                <com:ExeServer DisplayName="WindowsTerminal" Executable="WindowsTerminal.exe">
+                    <com:Class Id="051F34EE-C1FD-4B19-AF75-9BA54648434C"/>
+                </com:ExeServer>
                 <com:SurrogateServer DisplayName="WindowsTerminalShellExt">
-                    <com:Class Id="9f156763-7844-4dc4-b2b1-901f640f5155" Path="WindowsTerminalShellExt.dll" ThreadingModel="STA"/>
+                    <com:Class Id="52065414-e077-47ec-a3ac-1cc5455e1b54" Path="WindowsTerminalShellExt.dll" ThreadingModel="STA"/>
                 </com:SurrogateServer>
             </com:ComServer>
         </com:Extension>
         <desktop4:Extension Category="windows.fileExplorerContextMenus">
             <desktop4:FileExplorerContextMenus>
                 <desktop5:ItemType Type="Directory">
-                    <desktop5:Verb Id="Command1" Clsid="9f156763-7844-4dc4-b2b1-901f640f5155" />
+                    <desktop5:Verb Id="OpenTerminalDev" Clsid="52065414-e077-47ec-a3ac-1cc5455e1b54" />
                 </desktop5:ItemType>
                 <desktop5:ItemType Type="Directory\Background">
-                  <desktop5:Verb Id="Command2" Clsid="9f156763-7844-4dc4-b2b1-901f640f5155" />
+                  <desktop5:Verb Id="OpenTerminalDev" Clsid="52065414-e077-47ec-a3ac-1cc5455e1b54" />
                 </desktop5:ItemType>                
             </desktop4:FileExplorerContextMenus>
         </desktop4:Extension>

src/cascadia/CascadiaPackage/Package-Pre.appxmanifest

@@ -55,7 +55,6 @@
             <uap:ShowOn Tile="square310x310Logo"/>
           </uap:ShowNameOnTiles>
         </uap:DefaultTile>
-        <uap:SplashScreen Image="Images\SplashScreen.png"/>
       </uap:VisualElements>
 
       <Extensions>
@@ -75,20 +74,57 @@
             Enabled="false"
             DisplayName="ms-resource:AppNamePre" />
         </uap5:Extension>
+        <!-- DISABLED FOR 1.8
+        <uap3:Extension Category="windows.appExtension">
+            <uap3:AppExtension Name="com.microsoft.windows.console.host"
+                Id="OpenConsole-Pre"
+                DisplayName="OpenConsole Preview"
+                Description="Console host built from microsoft/terminal open source repository"
+                PublicFolder="Public">
+                <uap3:Properties>
+                    <Clsid>{06EC847C-C0A5-46B8-92CB-7C92F6E35CD5}</Clsid>
+                </uap3:Properties>
+            </uap3:AppExtension>
+        </uap3:Extension>
+        <uap3:Extension Category="windows.appExtension">
+            <uap3:AppExtension Name="com.microsoft.windows.terminal.host"
+                Id="Terminal-Pre"
+                DisplayName="Windows Terminal Preview"
+                Description="Terminal host built from microsoft/terminal open source repository"
+                PublicFolder="Public">
+                <uap3:Properties>
+                    <Clsid>{86633F1F-6454-40EC-89CE-DA4EBA977EE2}</Clsid>
+                </uap3:Properties>
+            </uap3:AppExtension>
+        </uap3:Extension>
+        -->
+        <com:Extension Category="windows.comInterface">
+            <com:ComInterface>
+                <com:ProxyStub Id="1833E661-CC81-4DD0-87C6-C2F74BD39EFA" DisplayName="OpenConsoleHandoffProxy" Path="OpenConsoleProxy.dll"/>
+                <com:Interface Id="2B607BC1-43EB-40C3-95AE-2856ADDB7F23" ProxyStubClsid="1833E661-CC81-4DD0-87C6-C2F74BD39EFA"/>
+                <com:Interface Id="FA1E3AB4-9AEC-4A3C-96CA-E6078C30BD74" ProxyStubClsid="1833E661-CC81-4DD0-87C6-C2F74BD39EFA"/>
+            </com:ComInterface>
+        </com:Extension>
         <com:Extension Category="windows.comServer">
             <com:ComServer>
+                <com:ExeServer DisplayName="OpenConsole" Executable="OpenConsole.exe">
+                    <com:Class Id="06EC847C-C0A5-46B8-92CB-7C92F6E35CD5"/>
+                </com:ExeServer>
+                <com:ExeServer DisplayName="WindowsTerminal" Executable="WindowsTerminal.exe">
+                    <com:Class Id="86633F1F-6454-40EC-89CE-DA4EBA977EE2"/>
+                </com:ExeServer>
                 <com:SurrogateServer DisplayName="WindowsTerminalShellExt">
-                    <com:Class Id="9f156763-7844-4dc4-b2b1-901f640f5155" Path="WindowsTerminalShellExt.dll" ThreadingModel="STA"/>
+                    <com:Class Id="02db545a-3e20-46de-83a5-1329b1e88b6b" Path="WindowsTerminalShellExt.dll" ThreadingModel="STA"/>
                 </com:SurrogateServer>
             </com:ComServer>
         </com:Extension>
         <desktop4:Extension Category="windows.fileExplorerContextMenus">
             <desktop4:FileExplorerContextMenus>
                 <desktop5:ItemType Type="Directory">
-                    <desktop5:Verb Id="Command1" Clsid="9f156763-7844-4dc4-b2b1-901f640f5155" />
+                    <desktop5:Verb Id="OpenTerminalPre" Clsid="02db545a-3e20-46de-83a5-1329b1e88b6b" />
                 </desktop5:ItemType>
                 <desktop5:ItemType Type="Directory\Background">
-                  <desktop5:Verb Id="Command2" Clsid="9f156763-7844-4dc4-b2b1-901f640f5155" />
+                  <desktop5:Verb Id="OpenTerminalPre" Clsid="02db545a-3e20-46de-83a5-1329b1e88b6b" />
                 </desktop5:ItemType>
             </desktop4:FileExplorerContextMenus>
         </desktop4:Extension>
@@ -106,8 +142,10 @@
   <Extensions>
     <uap7:Extension Category="windows.sharedFonts">
       <uap7:SharedFonts>
-        <uap4:Font File="Cascadia.ttf" />
+        <uap4:Font File="CascadiaCode.ttf" />
+        <uap4:Font File="CascadiaCodeItalic.ttf" />
         <uap4:Font File="CascadiaMono.ttf" />
+        <uap4:Font File="CascadiaMonoItalic.ttf" />
       </uap7:SharedFonts>
     </uap7:Extension>
   </Extensions>

src/cascadia/CascadiaPackage/Package.appxmanifest

@@ -55,7 +55,6 @@
             <uap:ShowOn Tile="square310x310Logo"/>
           </uap:ShowNameOnTiles>
         </uap:DefaultTile>
-        <uap:SplashScreen Image="Images\SplashScreen.png"/>
       </uap:VisualElements>
 
       <Extensions>
@@ -75,9 +74,43 @@
             Enabled="false"
             DisplayName="ms-resource:AppName" />
         </uap5:Extension>
-
+        <!-- <uap3:Extension Category="windows.appExtension">
+            <uap3:AppExtension Name="com.microsoft.windows.console.host"
+                Id="OpenConsole"
+                DisplayName="OpenConsole"
+                Description="Console host built from microsoft/terminal open source repository"
+                PublicFolder="Public">
+                <uap3:Properties>
+                    <Clsid>{2EACA947-7F5F-4CFA-BA87-8F7FBEEFBE69}</Clsid>
+                </uap3:Properties>
+            </uap3:AppExtension>
+        </uap3:Extension>
+        <uap3:Extension Category="windows.appExtension">
+            <uap3:AppExtension Name="com.microsoft.windows.terminal.host"
+                Id="Terminal"
+                DisplayName="Windows Terminal"
+                Description="Terminal host built from microsoft/terminal open source repository"
+                PublicFolder="Public">
+                <uap3:Properties>
+                    <Clsid>{E12CFF52-A866-4C77-9A90-F570A7AA2C6B}</Clsid>
+                </uap3:Properties>
+            </uap3:AppExtension>
+        </uap3:Extension>
+        <com:Extension Category="windows.comInterface">
+            <com:ComInterface>
+                <com:ProxyStub Id="3171DE52-6EFA-4AEF-8A9F-D02BD67E7A4F" DisplayName="OpenConsoleHandoffProxy" Path="OpenConsoleProxy.dll"/>
+                <com:Interface Id="2B607BC1-43EB-40C3-95AE-2856ADDB7F23" ProxyStubClsid="3171DE52-6EFA-4AEF-8A9F-D02BD67E7A4F"/>
+                <com:Interface Id="FA1E3AB4-9AEC-4A3C-96CA-E6078C30BD74" ProxyStubClsid="3171DE52-6EFA-4AEF-8A9F-D02BD67E7A4F"/>
+            </com:ComInterface>
+        </com:Extension> -->
         <com:Extension Category="windows.comServer">
             <com:ComServer>
+                <!-- <com:ExeServer DisplayName="OpenConsole" Executable="OpenConsole.exe">
+                    <com:Class Id="2EACA947-7F5F-4CFA-BA87-8F7FBEEFBE69"/>
+                </com:ExeServer>
+                <com:ExeServer DisplayName="WindowsTerminal" Executable="WindowsTerminal.exe">
+                    <com:Class Id="E12CFF52-A866-4C77-9A90-F570A7AA2C6B"/>
+                </com:ExeServer> -->
                 <com:SurrogateServer DisplayName="WindowsTerminalShellExt">
                     <com:Class Id="9f156763-7844-4dc4-b2b1-901f640f5155" Path="WindowsTerminalShellExt.dll" ThreadingModel="STA"/>
                 </com:SurrogateServer>
@@ -86,10 +119,10 @@
         <desktop4:Extension Category="windows.fileExplorerContextMenus">
             <desktop4:FileExplorerContextMenus>
                 <desktop5:ItemType Type="Directory">
-                    <desktop5:Verb Id="Command1" Clsid="9f156763-7844-4dc4-b2b1-901f640f5155" />
+                    <desktop5:Verb Id="OpenTerminalHere" Clsid="9f156763-7844-4dc4-b2b1-901f640f5155" />
                 </desktop5:ItemType>
                 <desktop5:ItemType Type="Directory\Background">
-                  <desktop5:Verb Id="Command2" Clsid="9f156763-7844-4dc4-b2b1-901f640f5155" />
+                  <desktop5:Verb Id="OpenTerminalHere" Clsid="9f156763-7844-4dc4-b2b1-901f640f5155" />
                 </desktop5:ItemType>
             </desktop4:FileExplorerContextMenus>
         </desktop4:Extension>
@@ -107,8 +140,10 @@
   <Extensions>
     <uap7:Extension Category="windows.sharedFonts">
       <uap7:SharedFonts>
-        <uap4:Font File="Cascadia.ttf" />
+        <uap4:Font File="CascadiaCode.ttf" />
+        <uap4:Font File="CascadiaCodeItalic.ttf" />
         <uap4:Font File="CascadiaMono.ttf" />
+        <uap4:Font File="CascadiaMonoItalic.ttf" />
       </uap7:SharedFonts>
     </uap7:Extension>
   </Extensions>