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[PR #10906] Implement and action for manually clearing the Terminal (and conpty) buffer #28293

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opened 2026-01-31 09:27:35 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:27:35 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/10906

State: closed
Merged: Yes

Summary of the Pull Request

clear-buffer-000

This adds a new action, clearBuffer. It accepts 3 values for the clear type:

  • "clear": "screen": Clear the terminal viewport content. Leaves the scrollback untouched. Moves the cursor row to the top of the viewport (unmodified).
  • "clear": "scrollback": Clear the scrollback. Leaves the viewport untouched.
  • "clear": "all": (default) Clear the scrollback and the visible viewport. Moves the cursor row to the top of the viewport (unmodified).

"Clear Buffer" has also been added to defaults.json.

References

PR Checklist

Detailed Description of the Pull Request / Additional comments

This is a bit tricky, because we need to plumb it all the way through conpty to clear the buffer. If we don't, then conpty will immediately just redraw the screen. So this sends a signal to the attached conpty, and then waits for conpty to draw the updated, cleared, screen back to us.

Validation Steps Performed

  • works for each of the three clear types as expected
  • tests pass.
  • works even with ping -t 8.8.8.8 as you'd hope.
**Original Pull Request:** https://github.com/microsoft/terminal/pull/10906 **State:** closed **Merged:** Yes --- ## Summary of the Pull Request ![clear-buffer-000](https://user-images.githubusercontent.com/18356694/127570078-90c6089e-0430-4dfc-bcd4-a0cde20c9167.gif) This adds a new action, `clearBuffer`. It accepts 3 values for the `clear` type: * `"clear": "screen"`: Clear the terminal viewport content. Leaves the scrollback untouched. Moves the cursor row to the top of the viewport (unmodified). * `"clear": "scrollback"`: Clear the scrollback. Leaves the viewport untouched. * `"clear": "all"`: (**default**) Clear the scrollback and the visible viewport. Moves the cursor row to the top of the viewport (unmodified). "Clear Buffer" has also been added to `defaults.json`. ## References * From microsoft/vscode#75141 originally ## PR Checklist * [x] Closes #1193 * [x] Closes #1882 * [x] I work here * [x] Tests added/passed * [ ] Requires documentation to be updated ## Detailed Description of the Pull Request / Additional comments This is a bit tricky, because we need to plumb it all the way through conpty to clear the buffer. If we don't, then conpty will immediately just redraw the screen. So this sends a signal to the attached conpty, and then waits for conpty to draw the updated, cleared, screen back to us. ## Validation Steps Performed * works for each of the three clear types as expected * tests pass. * works even with `ping -t 8.8.8.8` as you'd hope.
claunia added the pull-request label 2026-01-31 09:27:35 +00:00
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Reference: starred/terminal#28293
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