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Switch build backend to Hatchling (#3233)
[etc/vim.git] / scripts / diff_shades_gha_helper.py
1 """Helper script for psf/black's diff-shades Github Actions integration.
2
3 diff-shades is a tool for analyzing what happens when you run Black on
4 OSS code capturing it for comparisons or other usage. It's used here to
5 help measure the impact of a change *before* landing it (in particular
6 posting a comment on completion for PRs).
7
8 This script exists as a more maintainable alternative to using inline
9 Javascript in the workflow YAML files. The revision configuration and
10 resolving, caching, and PR comment logic is contained here.
11
12 For more information, please see the developer docs:
13
14 https://black.readthedocs.io/en/latest/contributing/gauging_changes.html#diff-shades
15 """
16
17 import json
18 import os
19 import platform
20 import pprint
21 import subprocess
22 import sys
23 import zipfile
24 from io import BytesIO
25 from pathlib import Path
26 from typing import Any
27
28 import click
29 import urllib3
30 from packaging.version import Version
31
32 if sys.version_info >= (3, 8):
33     from typing import Final, Literal
34 else:
35     from typing_extensions import Final, Literal
36
37 COMMENT_FILE: Final = ".pr-comment.json"
38 DIFF_STEP_NAME: Final = "Generate HTML diff report"
39 DOCS_URL: Final = (
40     "https://black.readthedocs.io/en/latest/"
41     "contributing/gauging_changes.html#diff-shades"
42 )
43 USER_AGENT: Final = f"psf/black diff-shades workflow via urllib3/{urllib3.__version__}"
44 SHA_LENGTH: Final = 10
45 GH_API_TOKEN: Final = os.getenv("GITHUB_TOKEN")
46 REPO: Final = os.getenv("GITHUB_REPOSITORY", default="psf/black")
47 http = urllib3.PoolManager()
48
49
50 def set_output(name: str, value: str) -> None:
51     if len(value) < 200:
52         print(f"[INFO]: setting '{name}' to '{value}'")
53     else:
54         print(f"[INFO]: setting '{name}' to [{len(value)} chars]")
55     print(f"::set-output name={name}::{value}")
56
57
58 def http_get(url: str, *, is_json: bool = True, **kwargs: Any) -> Any:
59     headers = kwargs.get("headers") or {}
60     headers["User-Agent"] = USER_AGENT
61     if "github" in url:
62         if GH_API_TOKEN:
63             headers["Authorization"] = f"token {GH_API_TOKEN}"
64         headers["Accept"] = "application/vnd.github.v3+json"
65     kwargs["headers"] = headers
66
67     r = http.request("GET", url, **kwargs)
68     if is_json:
69         data = json.loads(r.data.decode("utf-8"))
70     else:
71         data = r.data
72     print(f"[INFO]: issued GET request for {r.geturl()}")
73     if not (200 <= r.status < 300):
74         pprint.pprint(dict(r.info()))
75         pprint.pprint(data)
76         raise RuntimeError(f"unexpected status code: {r.status}")
77
78     return data
79
80
81 def get_main_revision() -> str:
82     data = http_get(
83         f"https://api.github.com/repos/{REPO}/commits",
84         fields={"per_page": "1", "sha": "main"},
85     )
86     assert isinstance(data[0]["sha"], str)
87     return data[0]["sha"]
88
89
90 def get_pr_revision(pr: int) -> str:
91     data = http_get(f"https://api.github.com/repos/{REPO}/pulls/{pr}")
92     assert isinstance(data["head"]["sha"], str)
93     return data["head"]["sha"]
94
95
96 def get_pypi_version() -> Version:
97     data = http_get("https://pypi.org/pypi/black/json")
98     versions = [Version(v) for v in data["releases"]]
99     sorted_versions = sorted(versions, reverse=True)
100     return sorted_versions[0]
101
102
103 @click.group()
104 def main() -> None:
105     pass
106
107
108 @main.command("config", help="Acquire run configuration and metadata.")
109 @click.argument("event", type=click.Choice(["push", "pull_request"]))
110 def config(event: Literal["push", "pull_request"]) -> None:
111     import diff_shades
112
113     if event == "push":
114         jobs = [{"mode": "preview-changes", "force-flag": "--force-preview-style"}]
115         # Push on main, let's use PyPI Black as the baseline.
116         baseline_name = str(get_pypi_version())
117         baseline_cmd = f"git checkout {baseline_name}"
118         target_rev = os.getenv("GITHUB_SHA")
119         assert target_rev is not None
120         target_name = "main-" + target_rev[:SHA_LENGTH]
121         target_cmd = f"git checkout {target_rev}"
122
123     elif event == "pull_request":
124         jobs = [
125             {"mode": "preview-changes", "force-flag": "--force-preview-style"},
126             {"mode": "assert-no-changes", "force-flag": "--force-stable-style"},
127         ]
128         # PR, let's use main as the baseline.
129         baseline_rev = get_main_revision()
130         baseline_name = "main-" + baseline_rev[:SHA_LENGTH]
131         baseline_cmd = f"git checkout {baseline_rev}"
132         pr_ref = os.getenv("GITHUB_REF")
133         assert pr_ref is not None
134         pr_num = int(pr_ref[10:-6])
135         pr_rev = get_pr_revision(pr_num)
136         target_name = f"pr-{pr_num}-{pr_rev[:SHA_LENGTH]}"
137         target_cmd = f"gh pr checkout {pr_num} && git merge origin/main"
138
139     env = f"{platform.system()}-{platform.python_version()}-{diff_shades.__version__}"
140     for entry in jobs:
141         entry["baseline-analysis"] = f"{entry['mode']}-{baseline_name}.json"
142         entry["baseline-setup-cmd"] = baseline_cmd
143         entry["target-analysis"] = f"{entry['mode']}-{target_name}.json"
144         entry["target-setup-cmd"] = target_cmd
145         entry["baseline-cache-key"] = f"{env}-{baseline_name}-{entry['mode']}"
146         if event == "pull_request":
147             # These are only needed for the PR comment.
148             entry["baseline-sha"] = baseline_rev
149             entry["target-sha"] = pr_rev
150
151     set_output("matrix", json.dumps(jobs, indent=None))
152     pprint.pprint(jobs)
153
154
155 @main.command("comment-body", help="Generate the body for a summary PR comment.")
156 @click.argument("baseline", type=click.Path(exists=True, path_type=Path))
157 @click.argument("target", type=click.Path(exists=True, path_type=Path))
158 @click.argument("baseline-sha")
159 @click.argument("target-sha")
160 @click.argument("pr-num", type=int)
161 def comment_body(
162     baseline: Path, target: Path, baseline_sha: str, target_sha: str, pr_num: int
163 ) -> None:
164     # fmt: off
165     cmd = [
166         sys.executable, "-m", "diff_shades", "--no-color",
167         "compare", str(baseline), str(target), "--quiet", "--check"
168     ]
169     # fmt: on
170     proc = subprocess.run(cmd, stdout=subprocess.PIPE, encoding="utf-8")
171     if not proc.returncode:
172         body = (
173             f"**diff-shades** reports zero changes comparing this PR ({target_sha}) to"
174             f" main ({baseline_sha}).\n\n---\n\n"
175         )
176     else:
177         body = (
178             f"**diff-shades** results comparing this PR ({target_sha}) to main"
179             f" ({baseline_sha}). The full diff is [available in the logs]"
180             f'($job-diff-url) under the "{DIFF_STEP_NAME}" step.'
181         )
182         body += "\n```text\n" + proc.stdout.strip() + "\n```\n"
183     body += (
184         f"[**What is this?**]({DOCS_URL}) | [Workflow run]($workflow-run-url) |"
185         " [diff-shades documentation](https://github.com/ichard26/diff-shades#readme)"
186     )
187     print(f"[INFO]: writing comment details to {COMMENT_FILE}")
188     with open(COMMENT_FILE, "w", encoding="utf-8") as f:
189         json.dump({"body": body, "pr-number": pr_num}, f)
190
191
192 @main.command("comment-details", help="Get PR comment resources from a workflow run.")
193 @click.argument("run-id")
194 def comment_details(run_id: str) -> None:
195     data = http_get(f"https://api.github.com/repos/{REPO}/actions/runs/{run_id}")
196     if data["event"] != "pull_request" or data["conclusion"] == "cancelled":
197         set_output("needs-comment", "false")
198         return
199
200     set_output("needs-comment", "true")
201     jobs = http_get(data["jobs_url"])["jobs"]
202     job = next(j for j in jobs if j["name"] == "analysis / preview-changes")
203     diff_step = next(s for s in job["steps"] if s["name"] == DIFF_STEP_NAME)
204     diff_url = job["html_url"] + f"#step:{diff_step['number']}:1"
205
206     artifacts = http_get(data["artifacts_url"])["artifacts"]
207     comment_artifact = next(a for a in artifacts if a["name"] == COMMENT_FILE)
208     comment_url = comment_artifact["archive_download_url"]
209     comment_zip = BytesIO(http_get(comment_url, is_json=False))
210     with zipfile.ZipFile(comment_zip) as zfile:
211         with zfile.open(COMMENT_FILE) as rf:
212             comment_data = json.loads(rf.read().decode("utf-8"))
213
214     set_output("pr-number", str(comment_data["pr-number"]))
215     body = comment_data["body"]
216     # It's more convenient to fill in these fields after the first workflow is done
217     # since this command can access the workflows API (doing it in the main workflow
218     # while it's still in progress seems impossible).
219     body = body.replace("$workflow-run-url", data["html_url"])
220     body = body.replace("$job-diff-url", diff_url)
221     # https://github.community/t/set-output-truncates-multiline-strings/16852/3
222     escaped = body.replace("%", "%25").replace("\n", "%0A").replace("\r", "%0D")
223     set_output("comment-body", escaped)
224
225
226 if __name__ == "__main__":
227     main()