+"""Helper script for psf/black's diff-shades Github Actions integration.
+
+diff-shades is a tool for analyzing what happens when you run Black on
+OSS code capturing it for comparisons or other usage. It's used here to
+help measure the impact of a change *before* landing it (in particular
+posting a comment on completion for PRs).
+
+This script exists as a more maintainable alternative to using inline
+Javascript in the workflow YAML files. The revision configuration and
+resolving, caching, and PR comment logic is contained here.
+
+For more information, please see the developer docs:
+
+https://black.readthedocs.io/en/latest/contributing/gauging_changes.html#diff-shades
+"""
+
+import json
+import os
+import platform
+import pprint
+import subprocess
+import sys
+import zipfile
+from io import BytesIO
+from pathlib import Path
+from typing import Any, Dict, Optional, Tuple
+
+import click
+import urllib3
+from packaging.version import Version
+
+if sys.version_info >= (3, 8):
+ from typing import Final, Literal
+else:
+ from typing_extensions import Final, Literal
+
+COMMENT_BODY_FILE: Final = ".pr-comment-body.md"
+DIFF_STEP_NAME: Final = "Generate HTML diff report"
+DOCS_URL: Final = (
+ "https://black.readthedocs.io/en/latest/"
+ "contributing/gauging_changes.html#diff-shades"
+)
+USER_AGENT: Final = f"psf/black diff-shades workflow via urllib3/{urllib3.__version__}"
+SHA_LENGTH: Final = 10
+GH_API_TOKEN: Final = os.getenv("GITHUB_TOKEN")
+REPO: Final = os.getenv("GITHUB_REPOSITORY", default="psf/black")
+http = urllib3.PoolManager()
+
+
+def set_output(name: str, value: str) -> None:
+ if len(value) < 200:
+ print(f"[INFO]: setting '{name}' to '{value}'")
+ else:
+ print(f"[INFO]: setting '{name}' to [{len(value)} chars]")
+ print(f"::set-output name={name}::{value}")
+
+
+def http_get(
+ url: str,
+ is_json: bool = True,
+ headers: Optional[Dict[str, str]] = None,
+ **kwargs: Any,
+) -> Any:
+ headers = headers or {}
+ headers["User-Agent"] = USER_AGENT
+ if "github" in url:
+ if GH_API_TOKEN:
+ headers["Authorization"] = f"token {GH_API_TOKEN}"
+ headers["Accept"] = "application/vnd.github.v3+json"
+ r = http.request("GET", url, headers=headers, **kwargs)
+ if is_json:
+ data = json.loads(r.data.decode("utf-8"))
+ else:
+ data = r.data
+ print(f"[INFO]: issued GET request for {r.geturl()}")
+ if not (200 <= r.status < 300):
+ pprint.pprint(dict(r.info()))
+ pprint.pprint(data)
+ raise RuntimeError(f"unexpected status code: {r.status}")
+
+ return data
+
+
+def get_branch_or_tag_revision(sha: str = "main") -> str:
+ data = http_get(
+ f"https://api.github.com/repos/{REPO}/commits",
+ fields={"per_page": "1", "sha": sha},
+ )
+ assert isinstance(data[0]["sha"], str)
+ return data[0]["sha"]
+
+
+def get_pr_revision(pr: int) -> str:
+ data = http_get(f"https://api.github.com/repos/{REPO}/pulls/{pr}")
+ assert isinstance(data["head"]["sha"], str)
+ return data["head"]["sha"]
+
+
+def get_pypi_version() -> Version:
+ data = http_get("https://pypi.org/pypi/black/json")
+ versions = [Version(v) for v in data["releases"]]
+ sorted_versions = sorted(versions, reverse=True)
+ return sorted_versions[0]
+
+
+def resolve_custom_ref(ref: str) -> Tuple[str, str]:
+ if ref == ".pypi":
+ # Special value to get latest PyPI version.
+ version = str(get_pypi_version())
+ return version, f"git checkout {version}"
+
+ if ref.startswith(".") and ref[1:].isnumeric():
+ # Special format to get a PR.
+ number = int(ref[1:])
+ revision = get_pr_revision(number)
+ return (
+ f"pr-{number}-{revision[:SHA_LENGTH]}",
+ f"gh pr checkout {number} && git merge origin/main",
+ )
+
+ # Alright, it's probably a branch, tag, or a commit SHA, let's find out!
+ revision = get_branch_or_tag_revision(ref)
+ # We're cutting the revision short as we might be operating on a short commit SHA.
+ if revision == ref or revision[: len(ref)] == ref:
+ # It's *probably* a commit as the resolved SHA isn't different from the REF.
+ return revision[:SHA_LENGTH], f"git checkout {revision}"
+
+ # It's *probably* a pre-existing branch or tag, yay!
+ return f"{ref}-{revision[:SHA_LENGTH]}", f"git checkout {revision}"
+
+
+@click.group()
+def main() -> None:
+ pass
+
+
+@main.command("config", help="Acquire run configuration and metadata.")
+@click.argument(
+ "event", type=click.Choice(["push", "pull_request", "workflow_dispatch"])
+)
+@click.argument("custom_baseline", required=False)
+@click.argument("custom_target", required=False)
+@click.option("--baseline-args", default="")
+def config(
+ event: Literal["push", "pull_request", "workflow_dispatch"],
+ custom_baseline: Optional[str],
+ custom_target: Optional[str],
+ baseline_args: str,
+) -> None:
+ import diff_shades
+
+ if event == "push":
+ # Push on main, let's use PyPI Black as the baseline.
+ baseline_name = str(get_pypi_version())
+ baseline_cmd = f"git checkout {baseline_name}"
+ target_rev = os.getenv("GITHUB_SHA")
+ assert target_rev is not None
+ target_name = "main-" + target_rev[:SHA_LENGTH]
+ target_cmd = f"git checkout {target_rev}"
+
+ elif event == "pull_request":
+ # PR, let's use main as the baseline.
+ baseline_rev = get_branch_or_tag_revision()
+ baseline_name = "main-" + baseline_rev[:SHA_LENGTH]
+ baseline_cmd = f"git checkout {baseline_rev}"
+
+ pr_ref = os.getenv("GITHUB_REF")
+ assert pr_ref is not None
+ pr_num = int(pr_ref[10:-6])
+ pr_rev = get_pr_revision(pr_num)
+ target_name = f"pr-{pr_num}-{pr_rev[:SHA_LENGTH]}"
+ target_cmd = f"gh pr checkout {pr_num} && git merge origin/main"
+
+ # These are only needed for the PR comment.
+ set_output("baseline-sha", baseline_rev)
+ set_output("target-sha", pr_rev)
+ else:
+ assert custom_baseline is not None and custom_target is not None
+ baseline_name, baseline_cmd = resolve_custom_ref(custom_baseline)
+ target_name, target_cmd = resolve_custom_ref(custom_target)
+ if baseline_name == target_name:
+ # Alright we're using the same revisions but we're (hopefully) using
+ # different command line arguments, let's support that too.
+ baseline_name += "-1"
+ target_name += "-2"
+
+ set_output("baseline-analysis", baseline_name + ".json")
+ set_output("baseline-setup-cmd", baseline_cmd)
+ set_output("target-analysis", target_name + ".json")
+ set_output("target-setup-cmd", target_cmd)
+
+ key = f"{platform.system()}-{platform.python_version()}-{diff_shades.__version__}"
+ key += f"-{baseline_name}-{baseline_args.encode('utf-8').hex()}"
+ set_output("baseline-cache-key", key)
+
+
+@main.command("comment-body", help="Generate the body for a summary PR comment.")
+@click.argument("baseline", type=click.Path(exists=True, path_type=Path))
+@click.argument("target", type=click.Path(exists=True, path_type=Path))
+@click.argument("baseline-sha")
+@click.argument("target-sha")
+def comment_body(
+ baseline: Path, target: Path, baseline_sha: str, target_sha: str
+) -> None:
+ # fmt: off
+ cmd = [
+ sys.executable, "-m", "diff_shades", "--no-color",
+ "compare", str(baseline), str(target), "--quiet", "--check"
+ ]
+ # fmt: on
+ proc = subprocess.run(cmd, stdout=subprocess.PIPE, encoding="utf-8")
+ if not proc.returncode:
+ body = (
+ f"**diff-shades** reports zero changes comparing this PR ({target_sha}) to"
+ f" main ({baseline_sha}).\n\n---\n\n"
+ )
+ else:
+ body = (
+ f"**diff-shades** results comparing this PR ({target_sha}) to main"
+ f" ({baseline_sha}). The full diff is [available in the logs]"
+ f'($job-diff-url) under the "{DIFF_STEP_NAME}" step.'
+ )
+ body += "\n```text\n" + proc.stdout.strip() + "\n```\n"
+ body += (
+ f"[**What is this?**]({DOCS_URL}) | [Workflow run]($workflow-run-url) |"
+ " [diff-shades documentation](https://github.com/ichard26/diff-shades#readme)"
+ )
+ print(f"[INFO]: writing half-completed comment body to {COMMENT_BODY_FILE}")
+ with open(COMMENT_BODY_FILE, "w", encoding="utf-8") as f:
+ f.write(body)
+
+
+@main.command("comment-details", help="Get PR comment resources from a workflow run.")
+@click.argument("run-id")
+def comment_details(run_id: str) -> None:
+ data = http_get(f"https://api.github.com/repos/{REPO}/actions/runs/{run_id}")
+ if data["event"] != "pull_request":
+ set_output("needs-comment", "false")
+ return
+
+ set_output("needs-comment", "true")
+ pulls = data["pull_requests"]
+ assert len(pulls) == 1
+ pr_number = pulls[0]["number"]
+ set_output("pr-number", str(pr_number))
+
+ jobs_data = http_get(data["jobs_url"])
+ assert len(jobs_data["jobs"]) == 1, "multiple jobs not supported nor tested"
+ job = jobs_data["jobs"][0]
+ steps = {s["name"]: s["number"] for s in job["steps"]}
+ diff_step = steps[DIFF_STEP_NAME]
+ diff_url = job["html_url"] + f"#step:{diff_step}:1"
+
+ artifacts_data = http_get(data["artifacts_url"])["artifacts"]
+ artifacts = {a["name"]: a["archive_download_url"] for a in artifacts_data}
+ body_url = artifacts[COMMENT_BODY_FILE]
+ body_zip = BytesIO(http_get(body_url, is_json=False))
+ with zipfile.ZipFile(body_zip) as zfile:
+ with zfile.open(COMMENT_BODY_FILE) as rf:
+ body = rf.read().decode("utf-8")
+ # It's more convenient to fill in these fields after the first workflow is done
+ # since this command can access the workflows API (doing it in the main workflow
+ # while it's still in progress seems impossible).
+ body = body.replace("$workflow-run-url", data["html_url"])
+ body = body.replace("$job-diff-url", diff_url)
+ # # https://github.community/t/set-output-truncates-multiline-strings/16852/3
+ escaped = body.replace("%", "%25").replace("\n", "%0A").replace("\r", "%0D")
+ set_output("comment-body", escaped)
+
+
+if __name__ == "__main__":
+ main()
projects / etc / vim.git / commitdiff