Add support for DECRPM/DECRQM

CHANGELOG.md

@@ -26,6 +26,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Inline vi-mode search using `f`/`F`/`t`/`T`
 - `window.blur` config option to request blur for transparent windows
 - `--option` argument for `alacritty msg create-window`
+- Support for `DECRQM`/`DECRPM` escape sequences
 
 ### Changed
 

alacritty_terminal/src/term/mod.rs

@@ -1921,6 +1921,58 @@ impl<T: EventListener> Handler for Term<T> {
         }
     }
 
+    #[inline]
+    fn report_private_mode(&mut self, mode: PrivateMode) {
+        trace!("Reporting private mode {mode:?}");
+        let state = match mode {
+            PrivateMode::Named(mode) => match mode {
+                NamedPrivateMode::CursorKeys => self.mode.contains(TermMode::APP_CURSOR).into(),
+                NamedPrivateMode::Origin => self.mode.contains(TermMode::ORIGIN).into(),
+                NamedPrivateMode::LineWrap => self.mode.contains(TermMode::LINE_WRAP).into(),
+                NamedPrivateMode::BlinkingCursor => {
+                    let style = self.cursor_style.get_or_insert(self.config.default_cursor_style);
+                    style.blinking.into()
+                },
+                NamedPrivateMode::ShowCursor => self.mode.contains(TermMode::SHOW_CURSOR).into(),
+                NamedPrivateMode::ReportMouseClicks => {
+                    self.mode.contains(TermMode::MOUSE_REPORT_CLICK).into()
+                },
+                NamedPrivateMode::ReportCellMouseMotion => {
+                    self.mode.contains(TermMode::MOUSE_DRAG).into()
+                },
+                NamedPrivateMode::ReportAllMouseMotion => {
+                    self.mode.contains(TermMode::MOUSE_MOTION).into()
+                },
+                NamedPrivateMode::ReportFocusInOut => {
+                    self.mode.contains(TermMode::FOCUS_IN_OUT).into()
+                },
+                NamedPrivateMode::Utf8Mouse => self.mode.contains(TermMode::UTF8_MOUSE).into(),
+                NamedPrivateMode::SgrMouse => self.mode.contains(TermMode::SGR_MOUSE).into(),
+                NamedPrivateMode::AlternateScroll => {
+                    self.mode.contains(TermMode::ALTERNATE_SCROLL).into()
+                },
+                NamedPrivateMode::UrgencyHints => {
+                    self.mode.contains(TermMode::URGENCY_HINTS).into()
+                },
+                NamedPrivateMode::SwapScreenAndSetRestoreCursor => {
+                    self.mode.contains(TermMode::ALT_SCREEN).into()
+                },
+                NamedPrivateMode::BracketedPaste => {
+                    self.mode.contains(TermMode::BRACKETED_PASTE).into()
+                },
+                NamedPrivateMode::SyncUpdate => ModeState::Reset,
+                NamedPrivateMode::ColumnMode => ModeState::NotSupported,
+            },
+            PrivateMode::Unknown(_) => ModeState::NotSupported,
+        };
+
+        self.event_proxy.send_event(Event::PtyWrite(format!(
+            "\x1b[?{};{}$p",
+            mode.raw(),
+            state as u8,
+        )));
+    }
+
     #[inline]
     fn set_mode(&mut self, mode: ansi::Mode) {
         let mode = match mode {
@@ -1958,6 +2010,26 @@ impl<T: EventListener> Handler for Term<T> {
         }
     }
 
+    #[inline]
+    fn report_mode(&mut self, mode: ansi::Mode) {
+        trace!("Reporting mode {mode:?}");
+        let state = match mode {
+            ansi::Mode::Named(mode) => match mode {
+                NamedMode::Insert => self.mode.contains(TermMode::INSERT).into(),
+                NamedMode::LineFeedNewLine => {
+                    self.mode.contains(TermMode::LINE_FEED_NEW_LINE).into()
+                },
+            },
+            ansi::Mode::Unknown(_) => ModeState::NotSupported,
+        };
+
+        self.event_proxy.send_event(Event::PtyWrite(format!(
+            "\x1b[{};{}$p",
+            mode.raw(),
+            state as u8,
+        )));
+    }
+
     #[inline]
     fn set_scrolling_region(&mut self, top: usize, bottom: Option<usize>) {
         // Fallback to the last line as default.
@@ -2079,6 +2151,28 @@ impl<T: EventListener> Handler for Term<T> {
     }
 }
 
+/// The state of the [`Mode`] and [`PrivateMode`].
+#[repr(u8)]
+#[derive(Debug, Clone, Copy)]
+enum ModeState {
+    /// The mode is not supported.
+    NotSupported = 0,
+    /// The mode is currently set.
+    Set = 1,
+    /// The mode is currently not set.
+    Reset = 2,
+}
+
+impl From<bool> for ModeState {
+    fn from(value: bool) -> Self {
+        if value {
+            Self::Set
+        } else {
+            Self::Reset
+        }
+    }
+}
+
 /// Terminal version for escape sequence reports.
 ///
 /// This returns the current terminal version as a unique number based on alacritty_terminal's

docs/escape_support.md

@@ -71,6 +71,8 @@ brevity.
 |            | REJECTED    | `11`-`19`, `51`-`55`                              |
 | `CSI n`    | IMPLEMENTED |                                                   |
 | `CSI P`    | IMPLEMENTED |                                                   |
+| `CSI $ p`  | IMPLEMENTED |                                                   |
+| `CSI ? $ p`| IMPLEMENTED |                                                   |
 | `CSI SP q` | IMPLEMENTED |                                                   |
 | `CSI r`    | IMPLEMENTED |                                                   |
 | `CSI S`    | IMPLEMENTED |                                                   |