The forge's tools close and read pull requests, read files and branches, and delete a branch

Ten tools the console lacked for the actions a review and a merge leave behind: close or reopen a
pull request whose work landed elsewhere, change its title or body, read its files, its diff and its
comments, reopen an issue, read one file at a ref, list branches, delete the branch a closed pull
request leaves. Each is the client's own call; `gitea_api` stays the escape hatch for the rest.
Tested against the fake forge through the compiled tools, the way the console calls them (13/13).

modules/gitea/client.ts

@@ -45,6 +45,14 @@ export interface GiteaPull {
   html_url: string;
 }
 
+export interface GiteaComment {
+  id: number;
+  user?: string;
+  body: string;
+  created_at?: string;
+  html_url: string;
+}
+
 export interface GiteaLabel {
   id: number;
   name: string;
@@ -257,6 +265,64 @@ export class GiteaClient {
     );
   }
 
+  /** Close or reopen a pull request without merging it. A pull request is an issue to the forge's
+   *  state machine, and the pulls endpoint takes the same `state`. */
+  async setPullState(owner: string, repo: string, index: number, state: "open" | "closed"): Promise<GiteaPull> {
+    return GiteaClient.mapPull(
+      await this.request<any>(`/repos/${owner}/${repo}/pulls/${index}`, { method: "PATCH", body: JSON.stringify({ state }) }),
+    );
+  }
+
+  /** Change a pull request's title or body; a field left undefined is left alone. */
+  async updatePullRequest(owner: string, repo: string, index: number, data: { title?: string; body?: string }): Promise<GiteaPull> {
+    return GiteaClient.mapPull(
+      await this.request<any>(`/repos/${owner}/${repo}/pulls/${index}`, { method: "PATCH", body: JSON.stringify(data) }),
+    );
+  }
+
+  /** The unified diff of a pull request, as text. */
+  async pullDiff(owner: string, repo: string, index: number): Promise<string> {
+    return this.requestText(`/repos/${owner}/${repo}/pulls/${index}.diff`);
+  }
+
+  /** Every comment on an issue or pull request, oldest first. */
+  async listComments(owner: string, repo: string, index: number): Promise<GiteaComment[]> {
+    const raw = await this.request<any[]>(`/repos/${owner}/${repo}/issues/${index}/comments`);
+    return (raw ?? []).map((c) => ({
+      id: Number(c?.id ?? 0),
+      user: c?.user?.login,
+      body: String(c?.body ?? ""),
+      created_at: c?.created_at,
+      html_url: String(c?.html_url ?? ""),
+    }));
+  }
+
+  /** One file's contents at a ref (default the repository's default branch), decoded. */
+  async getFile(owner: string, repo: string, path: string, ref?: string): Promise<{ path: string; ref?: string; sha: string; size: number; content: string }> {
+    const qs = ref ? `?ref=${encodeURIComponent(ref)}` : "";
+    const f = await this.request<any>(`/repos/${owner}/${repo}/contents/${path.split("/").map(encodeURIComponent).join("/")}${qs}`);
+    if (!f || f.type !== "file") throw new Error(`Gitea API: ${path} is not a file`);
+    const content = f.encoding === "base64" ? Buffer.from(String(f.content ?? ""), "base64").toString("utf8") : String(f.content ?? "");
+    return { path, ref, sha: String(f.sha ?? ""), size: Number(f.size ?? content.length), content };
+  }
+
+  async listBranches(owner: string, repo: string): Promise<{ name: string; commit: string; protected: boolean }[]> {
+    const raw = await this.request<any[]>(`/repos/${owner}/${repo}/branches?limit=100`);
+    return (raw ?? []).map((b) => ({ name: String(b?.name ?? ""), commit: String(b?.commit?.id ?? ""), protected: Boolean(b?.protected) }));
+  }
+
+  async deleteBranch(owner: string, repo: string, branch: string): Promise<void> {
+    await this.request(`/repos/${owner}/${repo}/branches/${encodeURIComponent(branch)}`, { method: "DELETE" });
+  }
+
+  /** A request whose answer is text, not JSON — a diff. Same token handling as request(). */
+  private async requestText(path: string): Promise<string> {
+    const token = await this.tokens.current();
+    const res = await this.send(path, { headers: { Accept: "text/plain" } }, token);
+    if (!res.ok) throw new Error(`Gitea API ${path}: ${res.status} ${await res.text()}`);
+    return res.text();
+  }
+
   async mergePullRequest(owner: string, repo: string, index: number, method = "merge", deleteBranch = false): Promise<void> {
     await this.request(`/repos/${owner}/${repo}/pulls/${index}/merge`, {
       method: "POST",