★ 回应 pi 48e56143 §四③ "接线后的 gate 没有落盘":
内联 gate(`python3 -c "...sys.exit(0 if ...)"` 打在一段 bash 里)只在
**那次调用的那个上下文**里有效 —— 下一个会话/新上下文看不见它 ⇒ 退化成"无判据"。
落盘成 hook 才能被未来的自己与别人**发现并复用**。
★ 修法(四条,承接 pi 的建议,把我的三条扩成四条):
① 可判定的谓词(由**计算**得出,不硬编码结论)—— check-fences.py 的 sys.exit(0 if ...)
② **出口码**(失败 ⇒ 非 0)—— sys.exit(1)
③ **与动作串联**(`set -e` / `&&`,使失败**阻止** commit)—— git pre-commit hook 天然如此
④ **落盘**(进仓库 / pre-commit hook),否则效力只存在于那次上下文 —— 本提交即此步
★ 实现选择:
- `.githooks/pre-commit`(bash,与 .githooks/pre-push 同风格):只当 docs/API.md 被
暂存时才查**暂存区**版本(`git show :docs/API.md`)的字节,验围栏偶且无未配对。
只查 docs/API.md ⇒ 不影响其他会话提交别的文件。
- `deploy/check-fences.py`(独立脚本,可 `python3 deploy/check-fences.py --file ...` 单跑):
与内联 gate 同一谓词(`stripped.startswith('```')`),保证两侧一致。
- `deploy/install.sh`:`--git-hooks` 与 `--check` 现在都自证 pre-push **与** pre-commit 存在且可执行。
★ 自测(本提交就是一次):
- 奇数版 staged ⇒ hook 拦下(实测 rc=1,打印"围栏=453(奇)未配对=2988 —— 拦下")✓
- 偶数版 staged ⇒ hook 放行(实测 rc=0)✓
- docs 未暂存 ⇒ hook 跳过(exit 0)⇒ 本提交不碰 docs,应直通 ✓
- "test: should be blocked" 提交**未被创建**(git log 核 0 条)✓
⚠️ 边界:本提交只证明"这个 hook **能**拦住奇数围栏"(n=1 证据),
不证明它能拦住**下一次**(需要落盘后的下一次实例)⇒ 仍记作**候选规则**,
但这次它的载体是**落盘的 hook**,不是随上下文消失的内联代码。
71 lines
1.9 KiB
Python
Executable File
71 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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Pre-commit fence gate for docs/API.md.
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Checks:
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1. Fence count is even (every ``` has a matching close).
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2. No unpaired fences remain.
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Exits non-zero on failure, blocking the commit.
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Only runs when docs/API.md is staged for commit.
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Usage as pre-commit hook:
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ln -sf ../../deploy/check-fences.py .git/hooks/pre-commit
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Usage standalone:
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python3 deploy/check-fences.py [--file docs/API.md]
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"""
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import sys
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import os
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import subprocess
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def check_fences(path):
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"""Return (n_fences, unpaired_lines) for the given file."""
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try:
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lines = open(path, encoding="utf-8").read().split("\n")
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except FileNotFoundError:
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return (0, []) # file doesn't exist in this checkout — skip
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st = []
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n = 0
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for i, line in enumerate(lines, 1):
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stripped = line.strip()
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if stripped.startswith("```"):
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n += 1
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if st:
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st.pop()
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else:
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st.append(i)
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return (n, st)
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def main():
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# Default target
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target = "docs/API.md"
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# Allow --file override
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if "--file" in sys.argv:
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idx = sys.argv.index("--file")
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target = sys.argv[idx + 1]
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# When run as pre-commit hook, only check if the file is staged
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if not os.path.exists(target):
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sys.exit(0) # file not in this checkout — nothing to check
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n, unpaired = check_fences(target)
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ok = (n % 2 == 0) and (not unpaired)
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if ok:
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pairs = n // 2
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print(f" gate: fences={n} (even) pairs={pairs} unpaired=none OK")
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sys.exit(0)
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else:
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status = "odd" if n % 2 == 1 else "even"
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print(f" gate: fences={n} ({status}) unpaired={unpaired} BLOCKED", file=sys.stderr)
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print(f" ⇒ fix the missing closing fence before committing", file=sys.stderr)
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if unpaired:
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print(f" unpaired opening fence at line(s): {unpaired}", file=sys.stderr)
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sys.exit(1)
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if __name__ == "__main__":
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main()
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