Fix multiple issues found under Linux (#706)

Fixed:
* `sighandler_t` warning in nightly
* cppdbg + gdb pretty printing
* UTF8 parsing for SGR mouse coords

.vscode/launch.json

@@ -10,18 +10,20 @@
             "program": "${workspaceFolder}/target/debug/edit",
             "cwd": "${workspaceFolder}",
             "args": [
-                "${workspaceFolder}/src/bin/edit/main.rs"
+                "${workspaceFolder}/crates/edit/src/bin/edit/main.rs"
             ],
         },
         {
-            "name": "Launch Debug (GDB/LLDB)",
+            "name": "Launch Debug (GDB)",
             "preLaunchTask": "rust: cargo build",
             "type": "cppdbg",
             "request": "launch",
+            "miDebuggerPath": "rust-gdb",
+            "externalConsole": true,
             "program": "${workspaceFolder}/target/debug/edit",
             "cwd": "${workspaceFolder}",
             "args": [
-                "${workspaceFolder}/src/bin/edit/main.rs"
+                "${workspaceFolder}/crates/edit/src/bin/edit/main.rs"
             ],
         },
         {
@@ -32,7 +34,7 @@
             "program": "${workspaceFolder}/target/debug/edit",
             "cwd": "${workspaceFolder}",
             "args": [
-                "${workspaceFolder}/src/bin/edit/main.rs"
+                "${workspaceFolder}/crates/edit/src/bin/edit/main.rs"
             ],
         }
     ]

crates/edit/src/input.rs

@@ -268,7 +268,7 @@ pub struct Parser {
     bracketed_paste: bool,
     bracketed_paste_buf: Vec<u8>,
     x10_mouse_want: bool,
-    x10_mouse_buf: [u8; 3],
+    x10_mouse_buf: [char; 3],
     x10_mouse_len: usize,
 }
 
@@ -281,7 +281,7 @@ impl Parser {
             bracketed_paste: false,
             bracketed_paste_buf: Vec::new(),
             x10_mouse_want: false,
-            x10_mouse_buf: [0; 3],
+            x10_mouse_buf: ['\0'; 3],
             x10_mouse_len: 0,
         }
     }
@@ -535,27 +535,35 @@ impl<'input> Stream<'_, '_, 'input> {
     /// This is so puzzling to me. The existence of this function makes me unhappy.
     #[cold]
     fn parse_x10_mouse_coordinates(&mut self) -> Option<Input<'input>> {
-        self.parser.x10_mouse_len +=
-            self.stream.read(&mut self.parser.x10_mouse_buf[self.parser.x10_mouse_len..]);
+        while self.parser.x10_mouse_len < 3 && !self.stream.done() {
+            self.parser.x10_mouse_buf[self.parser.x10_mouse_len] = self.stream.next_char();
+            self.parser.x10_mouse_len += 1;
+        }
         if self.parser.x10_mouse_len < 3 {
             return None;
         }
 
-        let button = self.parser.x10_mouse_buf[0] & 0b11;
-        let modifier = self.parser.x10_mouse_buf[0] & 0b11100;
+        let b = self.parser.x10_mouse_buf[0] as u32;
         let x = self.parser.x10_mouse_buf[1] as CoordType - 0x21;
         let y = self.parser.x10_mouse_buf[2] as CoordType - 0x21;
-        let action = match button {
+        let action = match b & 0b11 {
             0 => InputMouseState::Left,
             1 => InputMouseState::Middle,
             2 => InputMouseState::Right,
             _ => InputMouseState::None,
         };
-        let modifiers = match modifier {
-            4 => kbmod::SHIFT,
-            8 => kbmod::ALT,
-            16 => kbmod::CTRL,
-            _ => kbmod::NONE,
+        let modifiers = {
+            let mut m = kbmod::NONE;
+            if (b & 0b00100) != 0 {
+                m |= kbmod::SHIFT;
+            }
+            if (b & 0b01000) != 0 {
+                m |= kbmod::ALT;
+            }
+            if (b & 0b10000) != 0 {
+                m |= kbmod::CTRL;
+            }
+            m
         };
 
         self.parser.x10_mouse_want = false;

crates/edit/src/sys/unix.rs

@@ -63,7 +63,7 @@ pub fn switch_modes() -> apperr::Result<()> {
 
         // Set STATE.inject_resize to true whenever we get a SIGWINCH.
         let mut sigwinch_action: libc::sigaction = mem::zeroed();
-        sigwinch_action.sa_sigaction = sigwinch_handler as libc::sighandler_t;
+        sigwinch_action.sa_sigaction = sigwinch_handler as *const () as libc::sighandler_t;
         check_int_return(libc::sigaction(libc::SIGWINCH, &sigwinch_action, null_mut()))?;
 
         // Get the original terminal modes so we can disable raw mode on exit.

crates/edit/src/vt.rs

@@ -128,17 +128,13 @@ impl<'input> Stream<'_, 'input> {
         self.off
     }
 
-    /// Reads and consumes raw bytes from the input.
-    pub fn read(&mut self, dst: &mut [u8]) -> usize {
-        let bytes = self.input.as_bytes();
-        let off = self.off.min(bytes.len());
-        let len = dst.len().min(bytes.len() - off);
-        dst[..len].copy_from_slice(&bytes[off..off + len]);
-        self.off += len;
-        len
+    /// Returns `true` if the input has been fully parsed.
+    pub fn done(&self) -> bool {
+        self.off >= self.input.len()
     }
 
-    fn decode_next(&mut self) -> char {
+    /// Decodes and consumes the next UTF-8 character from the input.
+    pub fn next_char(&mut self) -> char {
         let mut iter = Utf8Chars::new(self.input.as_bytes(), self.off);
         let c = iter.next().unwrap_or('\0');
         self.off = iter.offset();
@@ -190,7 +186,7 @@ impl<'input> Stream<'_, 'input> {
                         return Some(Token::Text(&input[beg..self.off]));
                     }
                 },
-                State::Esc => match self.decode_next() {
+                State::Esc => match self.next_char() {
                     '[' => {
                         self.parser.state = State::Csi;
                         self.parser.csi.private_byte = '\0';
@@ -216,7 +212,7 @@ impl<'input> Stream<'_, 'input> {
                 },
                 State::Ss3 => {
                     self.parser.state = State::Ground;
-                    return Some(Token::SS3(self.decode_next()));
+                    return Some(Token::SS3(self.next_char()));
                 }
                 State::Csi => {
                     loop {