git: Implement commit creation (#23263)

- [x] Basic implementation
- [x] Disable commit buttons when committing is not possible (empty
message, no changes)
- [x] Upgrade GitSummary to efficiently figure out whether there are any
staged changes
- [x] Make CommitAll work
- [x] Surface errors with toasts
  - [x] Channel shutdown
  - [x] Empty commit message or no changes
  - [x] Failed git operations
- [x] Fix added files no longer appearing correctly in the project panel
(GitSummary breakage)
- [x] Fix handling of commit message

Release Notes:

- N/A

---------

Co-authored-by: Nate <nate@zed.dev>

crates/git/src/repository.rs

@@ -61,6 +61,8 @@ pub trait GitRepository: Send + Sync {
     ///
     /// If any of the paths were previously staged but do not exist in HEAD, they will be removed from the index.
     fn unstage_paths(&self, paths: &[RepoPath]) -> Result<()>;
+
+    fn commit(&self, message: &str) -> Result<()>;
 }
 
 impl std::fmt::Debug for dyn GitRepository {
@@ -280,6 +282,24 @@ impl GitRepository for RealGitRepository {
         }
         Ok(())
     }
+
+    fn commit(&self, message: &str) -> Result<()> {
+        let working_directory = self
+            .repository
+            .lock()
+            .workdir()
+            .context("failed to read git work directory")?
+            .to_path_buf();
+
+        let cmd = new_std_command(&self.git_binary_path)
+            .current_dir(&working_directory)
+            .args(["commit", "--quiet", "-m", message])
+            .status()?;
+        if !cmd.success() {
+            return Err(anyhow!("Failed to commit: {cmd}"));
+        }
+        Ok(())
+    }
 }
 
 #[derive(Debug, Clone)]
@@ -423,6 +443,10 @@ impl GitRepository for FakeGitRepository {
     fn unstage_paths(&self, _paths: &[RepoPath]) -> Result<()> {
         unimplemented!()
     }
+
+    fn commit(&self, _message: &str) -> Result<()> {
+        unimplemented!()
+    }
 }
 
 fn check_path_to_repo_path_errors(relative_file_path: &Path) -> Result<()> {