Enable viewing of worktrees under Repositories (#254992)

* init

* fix: correct configuration key for detecting Git worktrees

* Fixed misspelling of worktrees and populated worktree list

* exported parseGitWorktrees

* Replaced git commands with file system reader

* Removed trailing './git' from path

* Prevent errors when accessing empty worktree directory

* Enable worktree deletion

* code clean up

* Remove exposure to git extension

* labeling and minor fixes

* throw error when no worktrees created

* Error handling when getting worktrees

---------

Co-authored-by: bhavyaus <bhavyau@microsoft.com>

extensions/git/src/git.ts

@@ -860,6 +860,11 @@ export class GitStatusParser {
 	}
 }
 
+export interface Worktree {
+	readonly name: string;
+	readonly path: string;
+}
+
 export interface Submodule {
 	name: string;
 	path: string;
@@ -2028,6 +2033,11 @@ export class Repository {
 		await this.exec(args);
 	}
 
+	async deleteWorktree(path: string): Promise<void> {
+		const args = ['worktree', 'remove', path];
+		await this.exec(args);
+	}
+
 	async deleteRemoteRef(remoteName: string, refName: string, options?: { force?: boolean }): Promise<void> {
 		const args = ['push', remoteName, '--delete'];
 
@@ -2740,6 +2750,50 @@ export class Repository {
 		return parseGitStashes(result.stdout.trim());
 	}
 
+	async getWorktrees(): Promise<Worktree[]> {
+		return await this.getWorktreesFS();
+	}
+
+	private async getWorktreesFS(): Promise<Worktree[]> {
+		const worktreesPath = path.join(this.repositoryRoot, '.git', 'worktrees');
+
+		try {
+			// List all worktree folder names
+			const dirents = await fs.readdir(worktreesPath, { withFileTypes: true });
+			const result: Worktree[] = [];
+
+			for (const dirent of dirents) {
+				if (!dirent.isDirectory()) {
+					continue;
+				}
+
+				const gitdirPath = path.join(worktreesPath, dirent.name, 'gitdir');
+
+				try {
+					const gitdirContent = (await fs.readFile(gitdirPath, 'utf8')).trim();
+					// Remove trailing '/.git'
+					const gitdirTrimmed = gitdirContent.replace(/\.git.*$/, '');
+					result.push({ name: dirent.name, path: gitdirTrimmed });
+				} catch (err) {
+					if (/ENOENT/.test(err.message)) {
+						continue;
+					}
+
+					throw err;
+				}
+			}
+
+			return result;
+		}
+		catch (err) {
+			if (/ENOENT/.test(err.message)) {
+				return [];
+			}
+
+			throw err;
+		}
+	}
+
 	async getRemotes(): Promise<Remote[]> {
 		const remotes: MutableRemote[] = [];