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core: translate alt- prefix to an esc (0x1B) prefix

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This commit is contained in:
Mitchell Hashimoto
2023-08-12 16:04:48 -07:00
parent 387c62d226
commit c964a3f4c8
1 changed files with 26 additions and 3 deletions
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29
src/Surface.zig
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@ -1086,15 +1086,29 @@ pub fn keyCallback(
return true;
}
// If we have alt pressed, we're going to prefix any of the
// translations below with ESC (0x1B).
const alt = binding_mods.alt;
const unalt_mods = unalt_mods: {
var unalt_mods = binding_mods;
unalt_mods.alt = false;
break :unalt_mods unalt_mods;
};
// Handle non-printables
const char: u8 = char: {
const mods_int: u8 = @bitCast(binding_mods);
const mods_int: u8 = @bitCast(unalt_mods);
const ctrl_only: u8 = @bitCast(input.Mods{ .ctrl = true });
// If we're only pressing control, check if this is a character
// we convert to a non-printable. The best table I've found for
// this is:
// https://sw.kovidgoyal.net/kitty/keyboard-protocol/#legacy-ctrl-mapping-of-ascii-keys
//
// Note that depending on the apprt, these might be handled as
// composed characters. But not all app runtimes will do this;
// some only compose printable characters. So we manually handle
// this here.
if (mods_int == ctrl_only) {
const val: u8 = switch (key) {
.space => 0,
@ -1157,11 +1171,20 @@ pub fn keyCallback(
if (char > 0) {
// Ask our IO thread to write the data
var data: termio.Message.WriteReq.Small.Array = undefined;
data[0] = @intCast(char);
// Write our data. If we need to alt-prefix we add that first.
var i: u8 = 0;
if (alt) {
data[i] = 0x1B;
i += 1;
}
data[i] = @intCast(char);
i += 1;
_ = self.io_thread.mailbox.push(.{
.write_small = .{
.data = data,
.len = 1,
.len = i,
},
}, .{ .forever = {} });