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feat(tui): add legacy terminal support for Ctrl+symbol keys

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Ctrl+\ sends ASCII 28 (File Separator) in legacy terminals. This is
commonly used as SIGQUIT in Unix.

Ctrl+] sends ASCII 29 (Group Separator) in legacy terminals. This is
commonly used as the telnet escape character.

Ctrl+_ sends ASCII 31 (Unit Separator) in legacy terminals. On US
keyboards, - and _ are on the same physical key, so this also functions
as an alias for Ctrl+-.
This commit is contained in:
Sviatoslav Abakumov 2026-01-18 23:14:39 +04:00 • committed by Mario Zechner
parent 6bde679a5f
commit fb1242829d
2 changed files with 66 additions and 8 deletions
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33
packages/tui/test/keys.test.ts
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@ -137,6 +137,39 @@ describe("matchesKey", () => {
assert.strictEqual(parseKey("\x00"), "ctrl+space");
});
it("should match legacy Ctrl+symbol", () => {
setKittyProtocolActive(false);
// Ctrl+\ sends ASCII 28 (File Separator) in legacy terminals
assert.strictEqual(matchesKey("\x1c", "ctrl+\\"), true);
assert.strictEqual(parseKey("\x1c"), "ctrl+\\");
// Ctrl+] sends ASCII 29 (Group Separator) in legacy terminals
assert.strictEqual(matchesKey("\x1d", "ctrl+]"), true);
assert.strictEqual(parseKey("\x1d"), "ctrl+]");
// Ctrl+_ sends ASCII 31 (Unit Separator) in legacy terminals
// Ctrl+- is on the same physical key on US keyboards
assert.strictEqual(matchesKey("\x1f", "ctrl+_"), true);
assert.strictEqual(matchesKey("\x1f", "ctrl+-"), true);
assert.strictEqual(parseKey("\x1f"), "ctrl+-");
});
it("should match legacy Ctrl+Alt+symbol", () => {
setKittyProtocolActive(false);
// Ctrl+Alt+[ sends ESC followed by ESC (Ctrl+[ = ESC)
assert.strictEqual(matchesKey("\x1b\x1b", "ctrl+alt+["), true);
assert.strictEqual(parseKey("\x1b\x1b"), "ctrl+alt+[");
// Ctrl+Alt+\ sends ESC followed by ASCII 28
assert.strictEqual(matchesKey("\x1b\x1c", "ctrl+alt+\\"), true);
assert.strictEqual(parseKey("\x1b\x1c"), "ctrl+alt+\\");
// Ctrl+Alt+] sends ESC followed by ASCII 29
assert.strictEqual(matchesKey("\x1b\x1d", "ctrl+alt+]"), true);
assert.strictEqual(parseKey("\x1b\x1d"), "ctrl+alt+]");
// Ctrl+_ sends ASCII 31 (Unit Separator) in legacy terminals
// Ctrl+- is on the same physical key on US keyboards
assert.strictEqual(matchesKey("\x1b\x1f", "ctrl+alt+_"), true);
assert.strictEqual(matchesKey("\x1b\x1f", "ctrl+alt+-"), true);
assert.strictEqual(parseKey("\x1b\x1f"), "ctrl+alt+-");
});
it("should parse legacy alt-prefixed sequences when kitty inactive", () => {
setKittyProtocolActive(false);
assert.strictEqual(matchesKey("\x1b ", "alt+space"), true);