support Terminal identification sequence

This reports the TERM_PROGRAM and TERM_PROGRAM_VERSION
separated by a space.

See discussion in https://github.com/mintty/mintty/issues/881
with a more concise description of the functionality here in
this VTE issue: https://gitlab.gnome.org/GNOME/vte/-/issues/235

```bash
$ printf '\033[>q'; cat
^[P>|WezTerm 20200503-171512-b13ef15f-4-g0395639a^[\
```

src/mux/domain.rs

@@ -130,6 +130,8 @@ impl Domain for LocalDomain {
             size.pixel_width as usize,
             size.pixel_height as usize,
             std::sync::Arc::new(crate::config::TermConfig {}),
+            "WezTerm",
+            crate::wezterm_version(),
         );
 
         let mux = Mux::get().unwrap();

src/ssh.rs

@@ -261,6 +261,8 @@ impl Domain for RemoteSshDomain {
             size.pixel_width as usize,
             size.pixel_height as usize,
             std::sync::Arc::new(crate::config::TermConfig {}),
+            "WezTerm",
+            crate::wezterm_version(),
         );
 
         let mux = Mux::get().unwrap();

term/src/terminal.rs

@@ -53,6 +53,8 @@ impl Terminal {
         pixel_width: usize,
         pixel_height: usize,
         config: Arc<dyn TerminalConfiguration>,
+        term_program: &str,
+        term_version: &str,
     ) -> Terminal {
         Terminal {
             state: TerminalState::new(
@@ -61,6 +63,8 @@ impl Terminal {
                 pixel_height,
                 pixel_width,
                 config,
+                term_program,
+                term_version,
             ),
             parser: Parser::new(),
         }

term/src/terminalstate.rs

@@ -229,6 +229,9 @@ pub struct TerminalState {
     clipboard: Option<Arc<dyn Clipboard>>,
 
     current_dir: Option<Url>,
+
+    term_program: String,
+    term_version: String,
 }
 
 fn encode_modifiers(mods: KeyModifiers) -> u8 {
@@ -279,6 +282,8 @@ impl TerminalState {
         pixel_width: usize,
         pixel_height: usize,
         config: Arc<dyn TerminalConfiguration>,
+        term_program: &str,
+        term_version: &str,
     ) -> TerminalState {
         let screen = ScreenOrAlt::new(physical_rows, physical_cols, &config);
 
@@ -309,6 +314,8 @@ impl TerminalState {
             pixel_width,
             clipboard: None,
             current_dir: None,
+            term_program: term_program.to_string(),
+            term_version: term_version.to_string(),
         }
     }
 
@@ -1042,6 +1049,13 @@ impl TerminalState {
             Device::RequestSecondaryDeviceAttributes => {
                 host.writer().write(b"\x1b[>0;0;0c").ok();
             }
+            Device::RequestTerminalNameAndVersion => {
+                host.writer().write(DCS).ok();
+                host.writer()
+                    .write(format!(">|{} {}", self.term_program, self.term_version).as_bytes())
+                    .ok();
+                host.writer().write(ST).ok();
+            }
             Device::StatusReport => {
                 host.writer().write(b"\x1b[0n").ok();
             }

term/src/test/mod.rs

@@ -93,6 +93,8 @@ impl TestTerm {
             height * 16,
             width * 8,
             Arc::new(TestTermConfig { scrollback }),
+            "WezTerm",
+            "O_o",
         );
         let clip: Arc<dyn Clipboard> = Arc::new(LocalClip::new());
         term.set_clipboard(&clip);

termwiz/src/escape/csi.rs

@@ -172,6 +172,9 @@ pub enum Device {
     RequestPrimaryDeviceAttributes,
     RequestSecondaryDeviceAttributes,
     StatusReport,
+    /// https://github.com/mintty/mintty/issues/881
+    /// https://gitlab.gnome.org/GNOME/vte/-/issues/235
+    RequestTerminalNameAndVersion,
 }
 
 impl Display for Device {
@@ -188,6 +191,7 @@ impl Display for Device {
             Device::SoftReset => write!(f, "!p")?,
             Device::RequestPrimaryDeviceAttributes => write!(f, "c")?,
             Device::RequestSecondaryDeviceAttributes => write!(f, ">c")?,
+            Device::RequestTerminalNameAndVersion => write!(f, ">q")?,
             Device::StatusReport => write!(f, "5n")?,
         };
         Ok(())
@@ -1301,6 +1305,9 @@ impl<'a> CSIParser<'a> {
             ('r', &[b'?']) => self
                 .dec(params)
                 .map(|mode| CSI::Mode(Mode::RestoreDecPrivateMode(mode))),
+            ('q', &[b'>']) => self
+                .req_terminal_name_and_version(params)
+                .map(|dev| CSI::Device(Box::new(dev))),
             ('s', &[b'?']) => self
                 .dec(params)
                 .map(|mode| CSI::Mode(Mode::SaveDecPrivateMode(mode))),
@@ -1386,6 +1393,16 @@ impl<'a> CSIParser<'a> {
         }
     }
 
+    fn req_terminal_name_and_version(&mut self, params: &'a [i64]) -> Result<Device, ()> {
+        if params == [] {
+            Ok(Device::RequestTerminalNameAndVersion)
+        } else if params == [0] {
+            Ok(self.advance_by(1, params, Device::RequestTerminalNameAndVersion))
+        } else {
+            Err(())
+        }
+    }
+
     fn req_secondary_device_attributes(&mut self, params: &'a [i64]) -> Result<Device, ()> {
         if params == [] {
             Ok(Device::RequestSecondaryDeviceAttributes)