6268a4779c
## Summary of the Pull Request  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.
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
// Copyright (c) Microsoft Corporation.
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// Licensed under the MIT license.
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#include "precomp.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct _PseudoConsole
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{
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HANDLE hSignal;
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HANDLE hPtyReference;
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HANDLE hConPtyProcess;
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} PseudoConsole;
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// Signals
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// These are not defined publicly, but are used for controlling the conpty via
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// the signal pipe.
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#define PTY_SIGNAL_CLEAR_WINDOW (2u)
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#define PTY_SIGNAL_RESIZE_WINDOW (8u)
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// CreatePseudoConsole Flags
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// The other flag (PSEUDOCONSOLE_INHERIT_CURSOR) is actually defined in consoleapi.h in the OS repo
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// #define PSEUDOCONSOLE_INHERIT_CURSOR (0x1)
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#define PSEUDOCONSOLE_RESIZE_QUIRK (0x2)
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#define PSEUDOCONSOLE_WIN32_INPUT_MODE (0x4)
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// Implementations of the various PseudoConsole functions.
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HRESULT _CreatePseudoConsole(const HANDLE hToken,
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const COORD size,
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const HANDLE hInput,
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const HANDLE hOutput,
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const DWORD dwFlags,
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_Inout_ PseudoConsole* pPty);
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HRESULT _ResizePseudoConsole(_In_ const PseudoConsole* const pPty, _In_ const COORD size);
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HRESULT _ClearPseudoConsole(_In_ const PseudoConsole* const pPty);
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void _ClosePseudoConsoleMembers(_In_ PseudoConsole* pPty);
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VOID _ClosePseudoConsole(_In_ PseudoConsole* pPty);
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HRESULT ConptyCreatePseudoConsoleAsUser(_In_ HANDLE hToken,
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_In_ COORD size,
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_In_ HANDLE hInput,
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_In_ HANDLE hOutput,
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_In_ DWORD dwFlags,
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_Out_ HPCON* phPC);
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#ifdef __cplusplus
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}
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#endif
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