Add support for recommended packages on Debian

Packaging.Targets/Deb/DebPackageCreator.cs

@@ -33,6 +33,7 @@ namespace Packaging.Targets.Deb
             string preRemoveScript,
             string postRemoveScript,
             IEnumerable<string> additionalDependencies,
+            IEnumerable<string> recommends,
             Action<DebPackage> additionalMetadata)
         {
             var pkg = new DebPackage
@@ -130,11 +131,16 @@ namespace Packaging.Targets.Deb
                 }
             }
 
-            if (additionalDependencies != null)
+            if (additionalDependencies != null && additionalDependencies.Any())
             {
                 pkg.ControlFile["Depends"] = string.Join(", ", additionalDependencies);
             }
 
+            if (recommends != null && recommends.Any())
+            {
+                pkg.ControlFile["Recommends"] = string.Join(", ", recommends);
+            }
+
             additionalMetadata?.Invoke(pkg);
 
             return pkg;

Packaging.Targets/DebTask.cs

@@ -88,6 +88,12 @@ namespace Packaging.Targets
         /// </summary>
         public ITaskItem[] DebDependencies { get; set; }
 
+        /// <summary>
+        /// Gets or sets a list of Debian packages which this Debian
+        /// package recommends.
+        /// </summary>
+        public ITaskItem[] DebRecommends { get; set; }
+
         /// <summary>
         /// Gets or sets a value indicating whether to create a Linux
         /// user and group when installing the package.
@@ -230,6 +236,14 @@ namespace Packaging.Targets
                     dependencies.AddRange(debDotNetDependencies);
                 }
 
+                // Prepare the list of recommended dependencies
+                List<string> recommends = new List<string>();
+
+                if (this.DebRecommends != null)
+                {
+                    recommends.AddRange(this.DebRecommends.Select(d => d.ItemSpec));
+                }
+
                 // XZOutputStream class has low quality (doesn't even know it's current position,
                 // needs to be disposed to finish compression, etc),
                 // So we are doing compression in a separate step
@@ -261,6 +275,7 @@ namespace Packaging.Targets
                         this.PreRemoveScript,
                         this.PostRemoveScript,
                         dependencies,
+                        recommends,
                         null);
 
                     DebPackageCreator.WriteDebPackage(

Packaging.Targets/build/Packaging.Targets.targets

@@ -176,6 +176,7 @@
              DebDependencies="@(DebDependency)"
              DebDotNetDependencies="@(DebDotNetDependencies)"
              DebPackageArchitecture="$(DebPackageArchitecture)"
+			 DebRecommends="@(DebRecommends)"
              RuntimeIdentifier="$(RuntimeIdentifier)"
              CreateUser="$(CreateUser)"
              Maintainer="$(PackageMaintainer)"