Fix and speedup diff-shades integration

.github/mypyc-requirements.txt

@@ -0,0 +1,14 @@
+mypy == 0.920
+
+# A bunch of packages for type information
+mypy-extensions >= 0.4.3
+tomli >= 0.10.2
+types-typed-ast >= 1.4.2
+types-dataclasses >= 0.1.3
+typing-extensions > 3.10.0.1
+click >= 8.0.0
+platformdirs >= 2.1.0
+
+# And because build isolation is disabled, we'll need to pull this too
+setuptools-scm[toml] >= 6.3.1
+wheel

.github/workflows/diff_shades.yml

@@ -3,10 +3,10 @@ name: diff-shades
 on:
   push:
     branches: [main]
-    paths-ignore: ["docs/**", "tests/**", "*.md"]
+    paths-ignore: ["docs/**", "tests/**", "**.md", "**.rst"]
 
   pull_request:
-    paths-ignore: ["docs/**", "tests/**", "*.md"]
+    paths-ignore: ["docs/**", "tests/**", "**.md", "**.rst"]
 
   workflow_dispatch:
     inputs:
@@ -27,10 +27,18 @@ on:
         description: "Custom Black arguments (eg. -S)"
         required: false
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   analysis:
     name: analysis / linux
     runs-on: ubuntu-latest
+    env:
+      # Clang is less picky with the C code it's given than gcc (and may
+      # generate faster binaries too).
+      CC: clang-12
 
     steps:
       - name: Checkout this repository (full clone)
@@ -45,6 +53,7 @@ jobs:
           python -m pip install pip --upgrade
           python -m pip install https://github.com/ichard26/diff-shades/archive/stable.zip
           python -m pip install click packaging urllib3
+          python -m pip install -r .github/mypyc-requirements.txt
           # After checking out old revisions, this might not exist so we'll use a copy.
           cat scripts/diff_shades_gha_helper.py > helper.py
           git config user.name "diff-shades-gha"
@@ -66,22 +75,28 @@ jobs:
           path: ${{ steps.config.outputs.baseline-analysis }}
           key: ${{ steps.config.outputs.baseline-cache-key }}
 
-      - name: Install baseline revision
+      - name: Build and install baseline revision
         if: steps.baseline-cache.outputs.cache-hit != 'true'
         env:
           GITHUB_TOKEN: ${{ github.token }}
-        run: ${{ steps.config.outputs.baseline-setup-cmd }} && python -m pip install .
+        run: >
+          ${{ steps.config.outputs.baseline-setup-cmd }}
+          && python setup.py --use-mypyc bdist_wheel
+          && python -m pip install dist/*.whl && rm build dist -r
 
       - name: Analyze baseline revision
         if: steps.baseline-cache.outputs.cache-hit != 'true'
         run: >
           diff-shades analyze -v --work-dir projects-cache/
           ${{ steps.config.outputs.baseline-analysis }} -- ${{ github.event.inputs.baseline-args }}
 
-      - name: Install target revision
+      - name: Build and install target revision
         env:
           GITHUB_TOKEN: ${{ github.token }}
-        run: ${{ steps.config.outputs.target-setup-cmd }} && python -m pip install .
+        run: >
+          ${{ steps.config.outputs.target-setup-cmd }}
+          && python setup.py --use-mypyc bdist_wheel
+          && python -m pip install dist/*.whl
 
       - name: Analyze target revision
         run: >
@@ -118,13 +133,14 @@ jobs:
           python helper.py comment-body
           ${{ steps.config.outputs.baseline-analysis }} ${{ steps.config.outputs.target-analysis }}
           ${{ steps.config.outputs.baseline-sha }} ${{ steps.config.outputs.target-sha }}
+          ${{ github.event.pull_request.number }}
 
       - name: Upload summary file (PR only)
         if: github.event_name == 'pull_request'
         uses: actions/upload-artifact@v2
         with:
-          name: .pr-comment-body.md
-          path: .pr-comment-body.md
+          name: .pr-comment.json
+          path: .pr-comment.json
 
         # This is last so the diff-shades-comment workflow can still work even if we
         # end up detecting failed files and failing the run.

.github/workflows/diff_shades_comment.yml

@@ -31,15 +31,15 @@ jobs:
       - name: Try to find pre-existing PR comment
         if: steps.metadata.outputs.needs-comment == 'true'
         id: find-comment
-        uses: peter-evans/find-comment@v1
+        uses: peter-evans/find-comment@d2dae40ed151c634e4189471272b57e76ec19ba8
         with:
           issue-number: ${{ steps.metadata.outputs.pr-number }}
           comment-author: "github-actions[bot]"
           body-includes: "diff-shades"
 
       - name: Create or update PR comment
         if: steps.metadata.outputs.needs-comment == 'true'
-        uses: peter-evans/create-or-update-comment@v1
+        uses: peter-evans/create-or-update-comment@a35cf36e5301d70b76f316e867e7788a55a31dae
         with:
           comment-id: ${{ steps.find-comment.outputs.comment-id }}
           issue-number: ${{ steps.metadata.outputs.pr-number }}

docs/contributing/gauging_changes.md

@@ -74,7 +74,7 @@ to further information. If there's a pre-existing diff-shades comment, it'll be
 instead the next time the workflow is triggered on the same PR.
 
 The workflow uploads 3-4 artifacts upon completion: the two generated analyses (they
-have the .json file extension), `diff.html`, and `.pr-comment-body.md` if triggered by a
+have the .json file extension), `diff.html`, and `.pr-comment.json` if triggered by a
 PR. The last one is downloaded by the `diff-shades-comment` workflow and shouldn't be
 downloaded locally. `diff.html` comes in handy for push-based or manually triggered
 runs. And the analyses exist just in case you want to do further analysis using the

scripts/diff_shades_gha_helper.py

@@ -23,7 +23,7 @@
 import zipfile
 from io import BytesIO
 from pathlib import Path
-from typing import Any, Dict, Optional, Tuple
+from typing import Any, Optional, Tuple
 
 import click
 import urllib3
@@ -34,7 +34,7 @@
 else:
     from typing_extensions import Final, Literal
 
-COMMENT_BODY_FILE: Final = ".pr-comment-body.md"
+COMMENT_FILE: Final = ".pr-comment.json"
 DIFF_STEP_NAME: Final = "Generate HTML diff report"
 DOCS_URL: Final = (
     "https://black.readthedocs.io/en/latest/"
@@ -55,19 +55,16 @@ def set_output(name: str, value: str) -> None:
     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 {}
+def http_get(url: str, is_json: bool = True, **kwargs: Any) -> Any:
+    headers = kwargs.get("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)
+    kwargs["headers"] = headers
+
+    r = http.request("GET", url, **kwargs)
     if is_json:
         data = json.loads(r.data.decode("utf-8"))
     else:
@@ -199,8 +196,9 @@ def config(
 @click.argument("target", type=click.Path(exists=True, path_type=Path))
 @click.argument("baseline-sha")
 @click.argument("target-sha")
+@click.argument("pr-num", type=int)
 def comment_body(
-    baseline: Path, target: Path, baseline_sha: str, target_sha: str
+    baseline: Path, target: Path, baseline_sha: str, target_sha: str, pr_num: int
 ) -> None:
     # fmt: off
     cmd = [
@@ -225,45 +223,43 @@ def comment_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)
+    print(f"[INFO]: writing comment details to {COMMENT_FILE}")
+    with open(COMMENT_FILE, "w", encoding="utf-8") as f:
+        json.dump({"body": body, "pr-number": pr_num}, f)
 
 
 @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":
+    if data["event"] != "pull_request" or data["conclusion"] == "cancelled":
         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]
+    jobs = http_get(data["jobs_url"])["jobs"]
+    assert len(jobs) == 1, "multiple jobs not supported nor tested"
+    job = 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")
+    comment_url = artifacts[COMMENT_FILE]
+    comment_zip = BytesIO(http_get(comment_url, is_json=False))
+    with zipfile.ZipFile(comment_zip) as zfile:
+        with zfile.open(COMMENT_FILE) as rf:
+            comment_data = json.loads(rf.read().decode("utf-8"))
+
+    set_output("pr-number", str(comment_data["pr-number"]))
+    body = comment_data["body"]
     # 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.51.almunity/t/set-output-truncates-multiline-strings/16852/3
+    # https://github.51.almunity/t/set-output-truncates-multiline-strings/16852/3
     escaped = body.replace("%", "%25").replace("\n", "%0A").replace("\r", "%0D")
     set_output("comment-body", escaped)
 

src/black/parsing.py

@@ -206,7 +206,7 @@ def stringify_ast(node: Union[ast.AST, ast3.AST], depth: int = 0) -> Iterator[st
                 break
 
         try:
-            value = getattr(node, field)
+            value: object = getattr(node, field)
         except AttributeError:
             continue
 
@@ -237,6 +237,7 @@ def stringify_ast(node: Union[ast.AST, ast3.AST], depth: int = 0) -> Iterator[st
             yield from stringify_ast(value, depth + 2)
 
         else:
+            normalized: object
             # Constant strings may be indented across newlines, if they are
             # docstrings; fold spaces after newlines when comparing. Similarly,
             # trailing and leading space may be removed.