feat: quick pick branches for pull request

Show a quick pick with all remote branches as target when creating pull request.

Closes #223

src/commands/pull-requests.ts

@@ -174,30 +174,12 @@ export class CreatePullRequest extends PullRequestCommand {
       return;
     }
     let [owner, repo] = await this.git.getGitProviderOwnerAndRepository();
-    const repository = await this.githubManager.getRepository();
-    const items = [{
-      label: repository.name,
-      description: '',
-      repo: repository as { defaultBranch: string }
-    }];
-    if (repository.parent) {
-      items.push({
-        label: repository.parent.name,
-        description: '',
-        repo: repository.parent as { defaultBranch: string }
-      });
-    }
-    const selectedRepository = await vscode.window.showQuickPick(items,
-      { placeHolder: 'Select a repository to create the pull request in' });
+    const selectedRepository = await this.getRepository();
     if (!selectedRepository) {
       return;
     }
     [owner, repo] = selectedRepository.label.split('/');
-    const branch = await vscode.window.showInputBox({
-      ignoreFocusOut: true,
-      prompt: 'Select a branch to create the pull request for',
-      value: selectedRepository.repo.defaultBranch
-    });
+    const branch = await this.getTargetBranch(selectedRepository.repo.defaultBranch);
     if (!branch) {
       return;
     }
@@ -212,6 +194,44 @@ export class CreatePullRequest extends PullRequestCommand {
     }
   }
 
+  private async getRepository(): Promise<{label: string, repo: { defaultBranch: string }} | undefined> {
+    const repository = await this.githubManager.getRepository();
+    const items = [{
+      label: repository.name,
+      description: '',
+      repo: repository as { defaultBranch: string }
+    }];
+    if (repository.parent) {
+      items.push({
+        label: repository.parent.name,
+        description: '',
+        repo: repository.parent as { defaultBranch: string }
+      });
+    }
+    if (items.length === 1) {
+      return items[0];
+    }
+    return await vscode.window.showQuickPick(items,
+      { placeHolder: 'Select a repository to create the pull request in' });
+  }
+
+  private async getTargetBranch(defaultBranch: string): Promise<string | undefined> {
+    // sort default branch up
+    const picks = (await this.git.getRemoteBranches())
+      .sort((b1, b2) => {
+        if (b1 === defaultBranch) {
+          return -1;
+        } else if (b2 === defaultBranch) {
+          return 1;
+        }
+        return b1.localeCompare(b2);
+      });
+    return await vscode.window.showQuickPick(picks, {
+      ignoreFocusOut: true,
+      placeHolder: 'Select a branch to create the pull request for'
+    });
+  }
+
 }
 
 @component({eager: true})

src/git.ts

@@ -36,6 +36,15 @@ export class Git {
     }
   }
 
+  public async getRemoteBranches(): Promise<string[]> {
+    const response = await this.execute('git branch --list --remotes --no-color');
+    return response.stdout
+      .split('\n')
+      .filter(line => !line.match('->'))
+      .map(line => line.replace(`${this.remoteName}/`, ''))
+      .map(line => line.trim());
+  }
+
   /**
    * Check config for a default upstream and if none found look in .git/config for a remote origin and
    * parses it to get username and repository.