585 lines
21 KiB
Python
Executable File
585 lines
21 KiB
Python
Executable File
#!/usr/bin/env python3
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"""spec-revocation-check — generic spec-amendment revocation gate.
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Catches the two failure modes that have each felled a previous spec-amendment
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attempt: a fabricated ``Revokes prior text (<TAG>): "..."`` quote whose text
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was never in the file's pre-amendment state, and a normative line that was
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removed with NO revocation marker at all.
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Generic: walks any globs the caller provides, against any ``--base``
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commit-ish, with any ``--tag`` label, in any repo. No project-specific
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defaults.
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Exit codes:
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0 — clean
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1 — at least one violation (any of the four categories)
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2 — usage / environment error (bad --base, not a git repo, bad regex,
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missing --base / --glob)
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See ``specs/spec-revocation-check.spec.md`` for the full contract.
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"""
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from __future__ import annotations
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import argparse
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import json
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import re
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import subprocess
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import sys
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from pathlib import Path
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# --- Collapse helpers (blockquote, list-bullet, table outer pipes, then
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# whitespace). Match the reference byte-for-byte so a quote extracted in this
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# script matches the same quote at the same base sha.
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_WS_RE = re.compile(r"\s+")
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_BLOCKQUOTE_PREFIX_RE = re.compile(r"^>+\s*")
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_LIST_BULLET_PREFIX_RE = re.compile(r"^(?:[-*]|\d+\.)\s+")
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_TABLE_ROW_OUTER_PIPE_RE = re.compile(r"^\|\s*|\s*\|$")
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# Markdown-only lines that are pure structure (Check B ignores them).
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_TABLE_SEPARATOR_RE = re.compile(r"^\s*\|?[\s:|-]+\|?[\s:|-]*$")
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_CODE_FENCE_RE = re.compile(r"^\s*(```|~~~)\s*$")
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_HORIZONTAL_RULE_RE = re.compile(r"^\s*([-*_][\s]*){3,}\s*$")
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def collapse(text: str) -> str:
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"""Strip Markdown structural prefixes per line, then collapse all
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whitespace to single spaces (and trim)."""
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lines = text.splitlines()
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lines = [_BLOCKQUOTE_PREFIX_RE.sub("", line) for line in lines]
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lines = [_LIST_BULLET_PREFIX_RE.sub("", line) for line in lines]
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lines = [_TABLE_ROW_OUTER_PIPE_RE.sub("", line) for line in lines]
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return _WS_RE.sub(" ", " ".join(lines)).strip()
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def is_markdown_only(collapsed: str) -> bool:
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"""True if the collapsed text is pure Markdown structure (table
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separator, code fence, horizontal rule)."""
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if not collapsed:
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return True
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if "|" in collapsed and _TABLE_SEPARATOR_RE.match(collapsed):
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return True
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if _CODE_FENCE_RE.match(collapsed):
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return True
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if _HORIZONTAL_RULE_RE.match(collapsed):
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return True
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return False
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def is_free_prose_unquoted(line: str) -> bool:
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"""True if the line is a free-prose (no-quote) revocation marker.
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Recognised by the presence of ``Revokes prior text:`` (the colon form,
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no parens) AND the absence of any ``"`` on the same physical line.
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Examples::
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Revokes prior text: the pre-… wording
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**Revokes prior text:** the pre-… wording
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This is an older M23-era style that uses prose instead of a verbatim
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quote. Truly malformed lines (e.g. typos like ``Revokes prior text
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(M33): no quote`` or ``Revokes prior text typo``) lack the colon form
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or contain a ``"``, so they are not classified as free-prose.
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"""
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if "Revokes prior text:" not in line:
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return False
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return '"' not in line
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# --- Default marker regex builders ---------------------------------------
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# The two-branch no-tag pattern. We use named groups to disambiguate which
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# branch matched (the tagged branch's quote group is None on the untagged
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# branch, and vice versa).
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_NO_TAG_PATTERN = (
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r'Revokes prior text \((?P<tag>[^)]+)\):\s*"(?P<quote_tagged>.*)"'
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r'|Revokes prior text:\s*"(?P<quote_untagged>.*)"'
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)
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def default_marker_regex(tag: str | None) -> re.Pattern[str]:
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"""Build the default per-line marker pattern.
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With ``--tag TAG``: ``Revokes prior text (TAG):\\s*"(.*)"``.
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Without ``--tag``: either the tagged form for any single parenthesised
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token (group ``quote_tagged``), OR the untagged form
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``Revokes prior text:\\s*"(.*)"`` (group ``quote_untagged``).
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Greedy to the LAST ``"`` on the line so quotes containing literal ``"``
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still parse.
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"""
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if tag is not None:
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body = rf'Revokes prior text \({re.escape(tag)}\):\s*"(.*)"'
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else:
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body = _NO_TAG_PATTERN
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return re.compile(body)
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# --- Git helpers ----------------------------------------------------------
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def _git(repo_root: Path, *args: str) -> subprocess.CompletedProcess[str]:
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return subprocess.run(
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["git", "-C", str(repo_root), *args],
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capture_output=True,
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text=True,
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)
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def git_show(repo_root: Path, rev: str, rel_path: str) -> str | None:
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result = _git(repo_root, "show", f"{rev}:{rel_path}")
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if result.returncode != 0:
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return None
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return result.stdout
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def git_resolve(repo_root: Path, rev: str) -> str | None:
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"""Return the full sha for ``rev``, or None if it does not resolve."""
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result = _git(repo_root, "rev-parse", "--verify", f"{rev}^{{commit}}")
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if result.returncode != 0:
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return None
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return result.stdout.strip()
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def git_diff_renames(repo_root: Path, base: str) -> dict[str, str]:
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"""Return {old_path: new_path} for renames reported by ``git diff
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--find-renames --name-status -M30 <base>``.
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The ``-M30`` lowers the rename-detection similarity threshold from the
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default 50% to 30% — a renamed-then-quoted file has very low raw
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similarity (the original prose line is replaced with a revocation
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marker), so the default threshold misses it. 30% is conservative enough
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to avoid spurious matches on unrelated text but loose enough to catch
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the rename-and-amend case the brief describes.
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"""
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result = _git(repo_root, "diff", "--find-renames", "-M30", "--name-status", "--diff-filter=R", base)
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out: dict[str, str] = {}
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if result.returncode != 0:
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return out
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for line in result.stdout.splitlines():
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parts = line.split("\t")
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if len(parts) == 3 and parts[0].startswith("R"):
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_, old, new = parts
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out[old] = new
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return out
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# --- File enumeration -----------------------------------------------------
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def iter_files(repo_root: Path, globs: list[str]) -> list[Path]:
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"""Return every file matched by any glob, sorted, deduped."""
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seen: dict[Path, None] = {}
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for pattern in globs:
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for p in sorted(repo_root.glob(pattern)):
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if p.is_file():
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seen[p] = None
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return list(seen)
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def _glob_to_regex(pat: str) -> re.Pattern[str]:
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"""Translate a pathlib-style glob (``*``, ``**``, ``?``) to a regex.
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``**`` matches any number of path segments (including zero), consuming an
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optional trailing ``/``. ``*`` matches any chars except ``/``. ``?``
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matches one char except ``/``. Other chars are escaped.
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"""
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out: list[str] = []
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i = 0
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while i < len(pat):
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c = pat[i]
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if c == "*":
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if i + 1 < len(pat) and pat[i + 1] == "*":
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out.append(".*")
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i += 2
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if i < len(pat) and pat[i] == "/":
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i += 1
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else:
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out.append("[^/]*")
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i += 1
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elif c == "?":
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out.append("[^/]")
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i += 1
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else:
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out.append(re.escape(c))
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i += 1
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return re.compile("^" + "".join(out) + "$")
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def iter_files_at_base(repo_root: Path, base: str, globs: list[str]) -> list[str]:
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"""Return relative paths of every file that matched any glob at ``base``."""
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result = _git(repo_root, "ls-tree", "-r", "--name-only", base)
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if result.returncode != 0:
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return []
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base_paths = set(result.stdout.splitlines())
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compiled = [_glob_to_regex(g) for g in globs]
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out: list[str] = []
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seen: set[str] = set()
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for rel in sorted(base_paths):
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if rel in seen:
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continue
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if any(c.match(rel) for c in compiled):
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seen.add(rel)
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out.append(rel)
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return out
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# --- Marker parsing -------------------------------------------------------
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def find_quotes_and_malformed(
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path: Path,
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marker_re: re.Pattern[str],
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no_tag_mode: bool,
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tag: str | None,
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strict: bool,
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) -> tuple[list[tuple[int, str]], list[tuple[int, str]], int]:
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"""Return (quotes, malformed, ignored).
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``quotes``: ``[(line_no, quoted_text), ...]`` for every parseable marker.
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``malformed``: ``[(line_no, raw_line), ...]`` for every candidate line
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that contained the marker phrase but did NOT parse.
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``ignored``: count of free-prose unquoted lines seen in no-tag mode
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when ``strict`` is False. With ``--tag``, free-prose is impossible by
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construction (only literal-tagged lines are candidates), so this is
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always 0.
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In **tag mode** (``--tag TAG``, ``no_tag_mode == False``), only lines
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containing the literal ``Revokes prior text (TAG)`` are candidates;
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every other line is skipped before the regex runs, so a marker for a
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different tag, an untagged marker, or a free-prose marker cannot
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accidentally be classified as malformed or quoted.
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In **no-tag mode**, every line containing ``Revokes prior text`` is a
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candidate. A candidate that fails the multi-branch regex is split:
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``is_free_prose_unquoted`` lines become ``ignored`` (or ``malformed``
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if ``strict``); everything else becomes ``malformed``.
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"""
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quotes: list[tuple[int, str]] = []
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malformed: list[tuple[int, str]] = []
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ignored = 0
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tag_literal = f"Revokes prior text ({tag})" if not no_tag_mode else None
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for n, line in enumerate(path.read_text(encoding="utf-8").splitlines(), start=1):
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if "Revokes prior text" not in line:
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continue
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if tag_literal is not None and tag_literal not in line:
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# With --tag, lines without the literal TAG marker are entirely
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# ignored — not malformed, not quoted, not counted. Their text
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# is never used to cover deletions in this run.
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continue
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m = marker_re.search(line)
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if m:
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if no_tag_mode:
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# Group 'quote_tagged' is None on the untagged branch.
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q = m.group("quote_tagged")
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if q is None:
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q = m.group("quote_untagged")
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else:
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q = m.group(1)
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quotes.append((n, q or ""))
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else:
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if no_tag_mode and is_free_prose_unquoted(line):
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if strict:
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malformed.append((n, line))
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else:
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ignored += 1
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else:
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malformed.append((n, line))
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return quotes, malformed, ignored
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# --- The check itself -----------------------------------------------------
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def run_checks(
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repo_root: Path,
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base_sha: str,
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tag: str | None,
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marker_re: re.Pattern[str],
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globs: list[str],
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min_line_chars: int,
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strict: bool,
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) -> dict:
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files_at_head = iter_files(repo_root, globs)
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renames = git_diff_renames(repo_root, base_sha)
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head_rel_set = {str(p.relative_to(repo_root)) for p in files_at_head}
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# Inverse map: new -> old, for renamed files.
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rename_targets = {new: old for old, new in renames.items()}
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no_tag_mode = (tag is None)
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unquoted: list[dict] = []
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fabricated: list[dict] = []
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malformed: list[dict] = []
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ignored_total = 0
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# Pass 1: every file at HEAD (Check A + Check B).
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for path in files_at_head:
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rel = str(path.relative_to(repo_root))
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base_text = git_show(repo_root, base_sha, rel)
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# If this is a renamed file, the base text lives at the OLD path.
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if base_text is None and rel in rename_targets:
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old_rel = rename_targets[rel]
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base_text = git_show(repo_root, base_sha, old_rel)
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quotes, mf, ignored = find_quotes_and_malformed(
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path, marker_re, no_tag_mode, tag, strict,
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)
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ignored_total += ignored
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if base_text is None:
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# File did not exist at base (and is not a rename). Any quote is
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# fabricated.
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for ln, quote in quotes:
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fabricated.append({
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"path": rel, "line": ln, "base": base_sha,
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"quote": quote,
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"reason": "file did not exist at base",
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})
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for ln, raw in mf:
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malformed.append({
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"path": rel, "line": ln, "base": base_sha,
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"line_text": raw,
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})
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continue
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# Check A — verbatim quotes.
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collapsed_base = collapse(base_text)
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for ln, quote in quotes:
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cq = collapse(quote)
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if cq and cq not in collapsed_base:
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fabricated.append({
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"path": rel, "line": ln, "base": base_sha,
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"quote": quote,
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})
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# Malformed markers.
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for ln, raw in mf:
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malformed.append({
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"path": rel, "line": ln, "base": base_sha,
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"line_text": raw,
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})
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# Check B — completeness (only if file differs from base).
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current_text = path.read_text(encoding="utf-8")
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if collapse(base_text) == collapse(current_text):
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continue
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collapsed_current = collapse(current_text)
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collapsed_quotes = [collapse(q) for _, q in quotes]
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for n, line in enumerate(base_text.splitlines(), start=1):
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if not line.strip():
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continue
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collapsed_old = collapse(line)
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if not collapsed_old:
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continue
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if len(collapsed_old) < min_line_chars:
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continue
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if is_markdown_only(collapsed_old):
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continue
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if collapsed_old in collapsed_current:
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continue
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if any(collapsed_old in q for q in collapsed_quotes):
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continue
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unquoted.append({
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"path": rel, "line": n, "base": base_sha,
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"text": line.strip(),
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})
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# Pass 2: files that matched at base but not at HEAD (Check D).
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base_paths = iter_files_at_base(repo_root, base_sha, globs)
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deleted: list[dict] = []
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for rel in base_paths:
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if rel in head_rel_set:
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continue
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if rel in renames:
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new = renames[rel]
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if new in head_rel_set:
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continue # rename handled by Check B
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deleted.append({"path": rel, "base": base_sha})
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return {
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"repo_root": str(repo_root.resolve()),
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"base": base_sha,
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"tag": tag,
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"strict": strict,
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"marker_regex": marker_re.pattern,
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"files_checked": sorted(head_rel_set),
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"violations": {
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"unquoted_deletions": unquoted,
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"fabricated_quotes": fabricated,
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"malformed_markers": malformed,
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"deleted_since_base": deleted,
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},
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"summary": {
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"unquoted": len(unquoted),
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"fabricated": len(fabricated),
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"malformed": len(malformed),
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"deleted": len(deleted),
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"ignored": ignored_total,
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},
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}
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# --- Output ---------------------------------------------------------------
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def format_human(result: dict) -> str:
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"""Render the result dict as human-readable text."""
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lines: list[str] = []
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v = result["violations"]
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if v["unquoted_deletions"]:
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lines.append("unquoted deletions:")
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for x in v["unquoted_deletions"]:
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lines.append(f" {x['path']}:{x['line']} ({x['base']}): {x['text']}")
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if v["fabricated_quotes"]:
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lines.append("fabricated quotes:")
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for x in v["fabricated_quotes"]:
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reason = x.get("reason", "")
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if reason:
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lines.append(f" {x['path']}:{x['line']} ({x['base']}): {x['quote']!r} [{reason}]")
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else:
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lines.append(f" {x['path']}:{x['line']} ({x['base']}): {x['quote']!r}")
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if v["malformed_markers"]:
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lines.append("malformed markers:")
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for x in v["malformed_markers"]:
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lines.append(f" {x['path']}:{x['line']} ({x['base']}): {x['line_text']}")
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if v["deleted_since_base"]:
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lines.append("deleted since base:")
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for x in v["deleted_since_base"]:
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lines.append(f" {x['path']} ({x['base']})")
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if not any(v.values()) and result["summary"]["ignored"] == 0:
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return (
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f"spec-revocation-check: clean — every {result['base']} line "
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"survives or is quoted."
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)
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s = result["summary"]
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lines.append(
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f"Summary: {s['unquoted'] + s['fabricated'] + s['malformed'] + s['deleted']} "
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f"violation(s) — {s['unquoted']} unquoted, {s['fabricated']} fabricated, "
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f"{s['malformed']} malformed, {s['deleted']} deleted, "
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f"{s['ignored']} ignored"
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)
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return "\n".join(lines)
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# --- CLI ------------------------------------------------------------------
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def _validate_marker_regex(pattern: str) -> tuple[re.Pattern[str] | None, str | None]:
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"""Compile the pattern and check it has exactly one capture group."""
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try:
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compiled = re.compile(pattern)
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except re.error as e:
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return None, f"--marker-regex does not compile: {e}"
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if compiled.groups != 1:
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return None, (
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f"--marker-regex must have exactly one capture group, got "
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f"{compiled.groups}. The single group is the quote text."
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)
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return compiled, None
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def main(argv: list[str]) -> int:
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parser = argparse.ArgumentParser(
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description="Generic spec-amendment revocation gate.",
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add_help=True,
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)
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parser.add_argument("--base", required=True,
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help="pre-amendment base commit-ish (required)")
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parser.add_argument("--tag", default=None,
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help="marker tag, e.g. M33 (optional)")
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parser.add_argument("--glob", action="append", dest="globs", default=[],
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help="glob (relative to --repo-root), repeatable, REQUIRED")
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parser.add_argument("--repo-root", default=None,
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help="repo root (default: git rev-parse --show-toplevel of cwd)")
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parser.add_argument("--marker-regex", default=None,
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help="override the marker regex; must have exactly one capture group")
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parser.add_argument("--min-line-chars", type=int, default=12,
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help="ignore base lines shorter than this after collapsing (default: 12)")
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parser.add_argument("--strict", action="store_true",
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help="without --tag, treat free-prose unquoted markers as malformed "
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"(they are otherwise counted in the summary as 'ignored')")
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parser.add_argument("--json", action="store_true",
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help="emit result as JSON on stdout")
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parser.add_argument("--dryrun", "-n", action="store_true",
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help="print resolved config then run checks anyway")
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args = parser.parse_args(argv)
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if not args.globs:
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print("error: --glob is required (repeatable; no project default)", file=sys.stderr)
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return 2
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# Resolve repo root from cwd (NOT from the script's path).
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if args.repo_root is not None:
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repo_root = Path(args.repo_root).resolve()
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else:
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result = subprocess.run(
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["git", "rev-parse", "--show-toplevel"],
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capture_output=True, text=True,
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)
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if result.returncode != 0:
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print(
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f"error: not inside a git working tree "
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f"({result.stderr.strip() or 'git rev-parse failed'})",
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file=sys.stderr,
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)
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return 2
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repo_root = Path(result.stdout.strip()).resolve()
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# Verify --base resolves.
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base_sha = git_resolve(repo_root, args.base)
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if base_sha is None:
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print(
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f"error: --base {args.base!r} does not resolve in {repo_root}",
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file=sys.stderr,
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)
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return 2
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# Build / validate marker regex.
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if args.marker_regex is not None:
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marker_re, err = _validate_marker_regex(args.marker_regex)
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if err is not None:
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print(f"error: {err}", file=sys.stderr)
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return 2
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else:
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marker_re = default_marker_regex(args.tag)
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if args.min_line_chars < 0:
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print("error: --min-line-chars must be >= 0", file=sys.stderr)
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return 2
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# Dryrun: print resolved config (still run checks).
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if args.dryrun:
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head_files = iter_files(repo_root, args.globs)
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print(f"[dryrun] repo_root: {repo_root}")
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print(f"[dryrun] base: {args.base} -> {base_sha}")
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print(f"[dryrun] tag: {args.tag if args.tag else 'None'}")
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print(f"[dryrun] strict: {args.strict}")
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print(f"[dryrun] marker: {marker_re.pattern}")
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print(f"[dryrun] min_line_chars: {args.min_line_chars}")
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print(f"[dryrun] files: {len(head_files)}")
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for p in head_files:
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print(f"[dryrun] - {p.relative_to(repo_root)}")
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print()
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result = run_checks(
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repo_root=repo_root,
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base_sha=base_sha,
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tag=args.tag,
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marker_re=marker_re,
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globs=args.globs,
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min_line_chars=args.min_line_chars,
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strict=args.strict,
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)
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if args.json:
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json.dump(result, sys.stdout, indent=2, sort_keys=False)
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sys.stdout.write("\n")
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print(format_human(result), file=sys.stderr)
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else:
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print(format_human(result))
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s = result["summary"]
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total = s["unquoted"] + s["fabricated"] + s["malformed"] + s["deleted"]
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return 1 if total > 0 else 0
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if __name__ == "__main__":
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raise SystemExit(main(sys.argv[1:])) |