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const decoder = new TextDecoder();
export async function head(  env: { [index: string]: string },  cwd?: string,): Promise<string | undefined> {  try {    const process = Deno.run({      cmd: ["git", "rev-parse", "HEAD"],      env,      cwd,      stdout: "piped",    });    const output = await process.output();    return decoder.decode(output).trimEnd();  } catch {    return undefined;  }}
export async function branch(  env: { [index: string]: string },  cwd?: string,): Promise<string | undefined> {  try {    const process: Deno.Process = Deno.run({      cmd: ["git", "rev-parse", "--abbrev-ref", "HEAD"],      env,      cwd,      stdout: "piped",    });
    const headRef: string = decoder.decode(await process.output()).trimEnd();
    if (headRef === "HEAD") {      const process: Deno.Process = Deno.run({        cmd: ["git", "show", "-s", "--pretty=%d", "HEAD"],        env,        cwd,        stdout: "piped",      });      const output: string = decoder.decode(await process.output());      const branch: string | undefined = output        .replace(/^\(|\)$/g, "")        .split(", ")        .find((branch: string): boolean => branch.startsWith("origin/"));
      return branch ? branch.match(/^origin\/(.+)/)![1] : undefined;    }
    return headRef;  } catch {    return undefined;  }}