Debugger implementation (#13433)

###  DISCLAIMER

> As of 6th March 2025, debugger is still in development. We plan to
merge it behind a staff-only feature flag for staff use only, followed
by non-public release and then finally a public one (akin to how Git
panel release was handled). This is done to ensure the best experience
when it gets released.

### END OF DISCLAIMER 

**The current state of the debugger implementation:**


https://github.com/user-attachments/assets/c4deff07-80dd-4dc6-ad2e-0c252a478fe9


https://github.com/user-attachments/assets/e1ed2345-b750-4bb6-9c97-50961b76904f

----

All the todo's are in the following channel, so it's easier to work on
this together:
https://zed.dev/channel/zed-debugger-11370

If you are on Linux, you can use the following command to join the
channel:
```cli
zed https://zed.dev/channel/zed-debugger-11370 
```

## Current Features

- Collab
  - Breakpoints
    - Sync when you (re)join a project
    - Sync when you add/remove a breakpoint
  - Sync active debug line
  - Stack frames
    - Click on stack frame
      - View variables that belong to the stack frame
      - Visit the source file
    - Restart stack frame (if adapter supports this)
  - Variables
  - Loaded sources
  - Modules
  - Controls
    - Continue
    - Step back
      - Stepping granularity (configurable)
    - Step into
      - Stepping granularity (configurable)
    - Step over
      - Stepping granularity (configurable)
    - Step out
      - Stepping granularity (configurable)
  - Debug console
- Breakpoints
  - Log breakpoints
  - line breakpoints
  - Persistent between zed sessions (configurable)
  - Multi buffer support
  - Toggle disable/enable all breakpoints
- Stack frames
  - Click on stack frame
    - View variables that belong to the stack frame
    - Visit the source file
    - Show collapsed stack frames
  - Restart stack frame (if adapter supports this)
- Loaded sources
  - View all used loaded sources if supported by adapter.
- Modules
  - View all used modules (if adapter supports this)
- Variables
  - Copy value
  - Copy name
  - Copy memory reference
  - Set value (if adapter supports this)
  - keyboard navigation
- Debug Console
  - See logs
  - View output that was sent from debug adapter
    - Output grouping
  - Evaluate code
    - Updates the variable list
    - Auto completion
- If not supported by adapter, we will show auto-completion for existing
variables
- Debug Terminal
- Run custom commands and change env values right inside your Zed
terminal
- Attach to process (if adapter supports this)
  - Process picker
- Controls
  - Continue
  - Step back
    - Stepping granularity (configurable)
  - Step into
    - Stepping granularity (configurable)
  - Step over
    - Stepping granularity (configurable)
  - Step out
    - Stepping granularity (configurable)
  - Disconnect
  - Restart
  - Stop
- Warning when a debug session exited without hitting any breakpoint
- Debug view to see Adapter/RPC log messages
- Testing
  - Fake debug adapter
    - Fake requests & events

---

Release Notes:

- N/A

---------

Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
Co-authored-by: Anthony Eid <hello@anthonyeid.me>
Co-authored-by: Anthony <anthony@zed.dev>
Co-authored-by: Piotr Osiewicz <peterosiewicz@gmail.com>
Co-authored-by: Piotr <piotr@zed.dev>

crates/project/src/terminals.rs

@@ -35,6 +35,14 @@ pub enum TerminalKind {
     Shell(Option<PathBuf>),
     /// Run a task.
     Task(SpawnInTerminal),
+    /// Run a debug terminal.
+    Debug {
+        command: Option<String>,
+        args: Vec<String>,
+        envs: HashMap<String, String>,
+        cwd: PathBuf,
+        title: Option<String>,
+    },
 }
 
 /// SshCommand describes how to connect to a remote server
@@ -93,6 +101,7 @@ impl Project {
                     self.active_project_directory(cx)
                 }
             }
+            TerminalKind::Debug { cwd, .. } => Some(Arc::from(cwd.as_path())),
         };
 
         let mut settings_location = None;
@@ -196,6 +205,7 @@ impl Project {
                     this.active_project_directory(cx)
                 }
             }
+            TerminalKind::Debug { cwd, .. } => Some(Arc::from(cwd.as_path())),
         };
         let ssh_details = this.ssh_details(cx);
 
@@ -229,6 +239,7 @@ impl Project {
         };
 
         let mut python_venv_activate_command = None;
+        let debug_terminal = matches!(kind, TerminalKind::Debug { .. });
 
         let (spawn_task, shell) = match kind {
             TerminalKind::Shell(_) => {
@@ -324,6 +335,27 @@ impl Project {
                     }
                 }
             }
+            TerminalKind::Debug {
+                command,
+                args,
+                envs,
+                title,
+                ..
+            } => {
+                env.extend(envs);
+
+                let shell = if let Some(program) = command {
+                    Shell::WithArguments {
+                        program,
+                        args,
+                        title_override: Some(title.unwrap_or("Debug Terminal".into()).into()),
+                    }
+                } else {
+                    settings.shell.clone()
+                };
+
+                (None, shell)
+            }
         };
         TerminalBuilder::new(
             local_path.map(|path| path.to_path_buf()),
@@ -337,6 +369,7 @@ impl Project {
             ssh_details.is_some(),
             window,
             completion_tx,
+            debug_terminal,
             cx,
         )
         .map(|builder| {