Function runRevParse

packages/computer/src/git/cli.ts:880–942

(
  client: GitClient,
  args: string[],
  input: GitCliInput,
)

// ---------------------------------------------------------------

async function runRevParse(
  client: GitClient,
  args: string[],
  input: GitCliInput,
): Promise<GitCliResult> {
  const parsed = parseFlags(args, {
    "abbrev-ref": { kind: "bool" },
    "show-toplevel": { kind: "bool" },
  });
  if ("error" in parsed) {
    return { stdout: "", stderr: `git rev-parse: ${parsed.error}\n`, exitCode: 129 };
  }

  if (parsed.flags["show-toplevel"] === true) {
    // Print the working-tree root, walking up from cwd. Takes no
    // ref, so it short-circuits before the missing-ref check.
    const dir = resolveDir(undefined, input.cwd);
    try {
      const root = await client.repoRoot({ dir });
      return { stdout: `${root}\n`, stderr: "", exitCode: 0 };
    } catch (cause) {
      return mapGitError("rev-parse", cause);
    }
  }

  if (parsed.positional.length === 0) {
    return { stdout: "", stderr: "git rev-parse: missing <ref>\n", exitCode: 129 };
  }
  if (parsed.positional.length > 1) {
    return {
      stdout: "",
      stderr: `git rev-parse: unexpected argument '${parsed.positional[1]}'\n`,
      exitCode: 129,
    };
  }
  const dir = resolveDir(undefined, input.cwd);
  const ref = parsed.positional[0];

  if (parsed.flags["abbrev-ref"] === true) {
    // `--abbrev-ref HEAD` prints the symbolic branch name. On
    // detached HEAD real git falls back to printing the resolved
    // oid, so mirror that rather than erroring.
    try {
      if (ref === "HEAD") {
        const current = await client.currentBranch({ dir });
        if (current !== undefined) {
          return { stdout: `${current}\n`, stderr: "", exitCode: 0 };
        }
      }
      const oid = await client.revParse({ dir, ref });
      return { stdout: `${oid}\n`, stderr: "", exitCode: 0 };
    } catch (cause) {
      return mapGitError("rev-parse", cause);
    }
  }

  try {
    const oid = await client.revParse({ dir, ref });