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core: implement backarrow key mode (DECBKM) - mode 67

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This mode allows programs to modify the code that the `backspace`
key (backarrow key in DEC parlance) sends. If this mode is
`off`/`false`/`reset` (the default, the same as before this PR), we
send the byte `0x7f`. If this mode is `on`/`true`/`set` we send the
byte `0x08`.
This commit is contained in:
Jeffrey C. Ollie
2026-04-10 10:14:24 -05:00
parent 94cd3da8bc
commit aea70a5f7c
3 changed files with 82 additions and 3 deletions
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include/ghostty/vt/modes.h
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@@ -70,6 +70,7 @@ extern "C" {
#define GHOSTTY_MODE_REVERSE_WRAP (ghostty_mode_new(45, false)) /**< Reverse wrap */
#define GHOSTTY_MODE_ALT_SCREEN_LEGACY (ghostty_mode_new(47, false)) /**< Alternate screen (legacy) */
#define GHOSTTY_MODE_KEYPAD_KEYS (ghostty_mode_new(66, false)) /**< Application keypad */
#define GHOSTTY_MODE_BACKARROW_KEY_MODE (ghostty_mode_new(67, false)) /**< Backarrow key mode (DECBKM) */
#define GHOSTTY_MODE_LEFT_RIGHT_MARGIN (ghostty_mode_new(69, false)) /**< Left/right margin mode */
#define GHOSTTY_MODE_NORMAL_MOUSE (ghostty_mode_new(1000, false)) /**< Normal mouse tracking */
#define GHOSTTY_MODE_BUTTON_MOUSE (ghostty_mode_new(1002, false)) /**< Button-event mouse tracking */