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terminal: document DECECM report behavior

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This commit is contained in:
Ayush
2026-05-16 12:44:48 -07:00
parent f1ca88da37
commit 7bb3758008
1 changed files with 10 additions and 2 deletions
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12
src/terminal/modes.zig
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@@ -79,8 +79,16 @@ pub const ModeState = struct {
/// Return a DECRPM report for the given mode tag. If the tag does
/// not correspond to a known mode, the report state is .not_recognized.
pub fn getReport(self: *const ModeState, tag: ModeTag) Report {
// DECECM (Erase Color Mode) is DEC private mode 117. Ghostty behaves as
// if it is permanently reset and does not implement it as a mutable mode.
// DECECM (Erase Color Mode, DEC private mode 117) controls whether erasing
// and scrolling use the default background or the active background color.
// Ghostty's behavior is fixed equivalent to DECECM reset, and DECRQM has a
// "permanently reset" response for recognized modes that cannot be changed.
// Report that instead of "not recognized" so applications can query and adapt
// to Ghostty's erase-color behavior.
//
// See VT520/VT525 Programmer Information, "Erase Color" and DECRQM/DECRPM:
// https://web.mit.edu/dosathena/doc/www/ek-vt520-rm.pdf
if (!tag.ansi and tag.value == 117) {
return .{ .tag = tag, .state = .permanently_reset };
}