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terminal: extract DECRPM mode report encoding to terminal package

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This extracts our mode reporting from being hardcoded in termio
to being reusable in the existing `terminal.modes` namespace. The goal
is to expose this via the Zig API libghostty (done) and C API (to do
later).
This commit is contained in:
Mitchell Hashimoto
2026-03-16 14:47:50 -07:00
parent e90dbc9da6
commit d6b37ba38f
2 changed files with 132 additions and 26 deletions
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41
src/termio/stream_handler.zig
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@@ -610,35 +610,24 @@ pub const StreamHandler = struct {
}
fn requestMode(self: *StreamHandler, mode: terminal.Mode) !void {
const tag: terminal.modes.ModeTag = @bitCast(@intFromEnum(mode));
const code: u8 = if (self.terminal.modes.get(mode)) 1 else 2;
var msg: termio.Message = .{ .write_small = .{} };
const resp = try std.fmt.bufPrint(
&msg.write_small.data,
"\x1B[{s}{};{}$y",
.{
if (tag.ansi) "" else "?",
tag.value,
code,
},
);
msg.write_small.len = @intCast(resp.len);
self.messageWriter(msg);
self.sendModeReport(self.terminal.modes.getReport(.fromMode(mode)));
}
fn requestModeUnknown(self: *StreamHandler, mode_raw: u16, ansi: bool) !void {
var msg: termio.Message = .{ .write_small = .{} };
const resp = try std.fmt.bufPrint(
&msg.write_small.data,
"\x1B[{s}{};0$y",
.{
if (ansi) "" else "?",
mode_raw,
},
);
msg.write_small.len = @intCast(resp.len);
self.messageWriter(msg);
self.sendModeReport(self.terminal.modes.getReport(.{ .value = @truncate(mode_raw), .ansi = ansi }));
}
fn sendModeReport(self: *StreamHandler, report: terminal.modes.Report) void {
var data: termio.Message.WriteReq.Small.Array = undefined;
var writer: std.Io.Writer = .fixed(&data);
report.encode(&writer) catch |err| {
log.err("error encoding mode report err={}", .{err});
return;
};
self.messageWriter(.{ .write_small = .{
.data = data,
.len = @intCast(writer.buffered().len),
} });
}
pub fn setMode(self: *StreamHandler, mode: terminal.Mode, enabled: bool) !void {