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lib-vt: add color scheme report encoder

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Add a shared encoder for CSI ? 997 ; Ps n color scheme reports and use 
it for both CSI ? 996 n replies and unsolicited Termio reports. Export the 
same encoder through the libghostty-vt C API with docs and an example.

This is a really light API, arguably easy for consumers to hardcode,
but it didn't match the rest of our style in the libghostty API so we 
should expose it.

Example: GHOSTTY_COLOR_SCHEME_DARK encodes to ESC [ ? 997 ; 1 n,
while GHOSTTY_COLOR_SCHEME_LIGHT encodes to ESC [ ? 997 ; 2 n.
This commit is contained in:
Mitchell Hashimoto
2026-07-04 20:34:53 -07:00
parent 98df7efc83
commit f00e906949
12 changed files with 301 additions and 8 deletions
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12
src/termio/Termio.zig
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@@ -712,11 +712,15 @@ pub fn colorSchemeReportLocked(self: *Termio, td: *ThreadData, force: bool) !voi
if (!force and !self.renderer_state.terminal.modes.get(.report_color_scheme)) {
return;
}
const output = switch (self.config.conditional_state.theme) {
.light => "\x1B[?997;2n",
.dark => "\x1B[?997;1n",
const scheme: terminalpkg.device_status.ColorScheme = switch (self.config.conditional_state.theme) {
.light => .light,
.dark => .dark,
};
try self.queueWrite(td, output, false);
var buf: [terminalpkg.device_status.max_color_scheme_report_encode_size]u8 = undefined;
var writer: std.Io.Writer = .fixed(&buf);
try terminalpkg.device_status.encodeColorSchemeReport(&writer, scheme);
try self.queueWrite(td, writer.buffered(), false);
}
/// ThreadData is the data created and stored in the termio thread