name: git.diff_name_only
description: List changed file names relative to a git base ref.
source:
  type: cli-tool
  command: node
  args:
    - -e
    - |
      const { spawnSync } = require("node:child_process");
      const path = require("node:path");

      const inputs = JSON.parse(process.env.RUNX_INPUTS_JSON || "{}");
      const repoRoot = path.resolve(String(inputs.repo_root || process.env.RUNX_CWD || process.cwd()));
      const base = String(inputs.base || "HEAD");

      const result = spawnSync("git", ["-C", repoRoot, "diff", "--name-only", "--relative", base], {
        encoding: "utf8",
        shell: false,
      });
      if (result.error) {
        throw result.error;
      }
      if (result.status !== 0) {
        if (result.stderr) process.stderr.write(result.stderr);
        process.exit(result.status ?? 1);
      }

      process.stdout.write(JSON.stringify({
        repo_root: repoRoot,
        base,
        files: result.stdout.split(/\\r?\\n/).map((line) => line.trim()).filter(Boolean),
      }));
inputs:
  repo_root:
    type: string
    required: false
    description: Repository root; defaults to RUNX_CWD or the current working directory.
  base:
    type: string
    required: false
    description: Base revision or tree-ish to diff against; defaults to HEAD.
scopes:
  - git.read
runx:
  artifacts:
    wrap_as: git_diff