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#!/usr/bin/env python3
"""PreToolUse hook for Bash: gate `gh pr create` behind a confirmation modal.
Parses title, body, base, head, reviewers, labels, draft flag from the
`gh pr create` command and renders a modal so the user sees exactly what
will be opened.
Wire in ~/.claude/settings.json alongside git-commit-confirm.py:
{
"hooks": {
"PreToolUse": [
{
"matcher": "Bash",
"hooks": [
{
"type": "command",
"command": "~/.claude/hooks/gh-pr-create-confirm.py"
}
]
}
]
}
}
"""
import json
import re
import sys
MAX_BODY_LINES = 20
def main() -> int:
try:
payload = json.loads(sys.stdin.read())
except (json.JSONDecodeError, ValueError):
return 0
if payload.get("tool_name") != "Bash":
return 0
cmd = payload.get("tool_input", {}).get("command", "")
if not re.search(r"(?:^|[\s;&|()])gh\s+pr\s+create\b", cmd):
return 0
fields = parse_pr_create(cmd)
reason = format_pr_confirmation(fields)
output = {
"hookSpecificOutput": {
"hookEventName": "PreToolUse",
"permissionDecision": "ask",
"permissionDecisionReason": reason,
}
}
print(json.dumps(output))
return 0
def parse_pr_create(cmd: str) -> dict:
fields: dict = {
"title": None,
"body": None,
"base": None,
"head": None,
"reviewers": [],
"labels": [],
"assignees": [],
"milestone": None,
"draft": False,
}
# Title — quoted string after --title / -t
t = re.search(r"--title\s+([\"'])(.*?)\1", cmd, re.DOTALL)
if not t:
t = re.search(r"\s-t\s+([\"'])(.*?)\1", cmd, re.DOTALL)
if t:
fields["title"] = t.group(2)
# Body — HEREDOC inside $() first, then plain quoted string, then --body-file
body_heredoc = re.search(
r"--body\s+\"\$\(cat\s*<<-?\s*['\"]?(\w+)['\"]?\s*\n(.*?)\n\s*\1\s*\)\"",
cmd,
re.DOTALL,
)
if body_heredoc:
fields["body"] = body_heredoc.group(2).strip()
else:
b = re.search(r"--body\s+([\"'])(.*?)\1", cmd, re.DOTALL)
if b:
fields["body"] = b.group(2).strip()
else:
bf = re.search(r"--body-file\s+(\S+)", cmd)
if bf:
fields["body"] = f"(body read from file: {bf.group(1)})"
# Base / head
base = re.search(r"--base\s+(\S+)", cmd)
if not base:
base = re.search(r"\s-B\s+(\S+)", cmd)
if base:
fields["base"] = base.group(1)
head = re.search(r"--head\s+(\S+)", cmd)
if not head:
head = re.search(r"\s-H\s+(\S+)", cmd)
if head:
fields["head"] = head.group(1)
# Multi-valued flags (comma-separated or repeated)
for name, key in (
("reviewer", "reviewers"),
("label", "labels"),
("assignee", "assignees"),
):
pattern = rf"--{name}[=\s]([\"']?)([^\s\"']+)\1"
for match in re.finditer(pattern, cmd):
fields[key].extend(match.group(2).split(","))
# Milestone
m = re.search(r"--milestone[=\s]([\"'])?([^\s\"']+)\1?", cmd)
if m:
fields["milestone"] = m.group(2)
# Draft flag
if re.search(r"--draft\b", cmd):
fields["draft"] = True
return fields
def format_pr_confirmation(fields: dict) -> str:
lines = ["Create pull request?", ""]
if fields["draft"]:
lines.append("[DRAFT]")
lines.append("")
lines.append(f"Title: {fields['title'] or '(not parsed)'}")
base = fields["base"] or "(default — usually main)"
head = fields["head"] or "(current branch)"
lines.append(f"Base ← Head: {base} ← {head}")
if fields["reviewers"]:
lines.append(f"Reviewers: {', '.join(fields['reviewers'])}")
if fields["assignees"]:
lines.append(f"Assignees: {', '.join(fields['assignees'])}")
if fields["labels"]:
lines.append(f"Labels: {', '.join(fields['labels'])}")
if fields["milestone"]:
lines.append(f"Milestone: {fields['milestone']}")
lines.append("")
if fields["body"]:
lines.append("Body:")
body_lines = fields["body"].splitlines()
for line in body_lines[:MAX_BODY_LINES]:
lines.append(f" {line}")
if len(body_lines) > MAX_BODY_LINES:
lines.append(f" ... ({len(body_lines) - MAX_BODY_LINES} more lines)")
else:
lines.append("Body: (not parsed)")
lines.append("")
lines.append("Confirm target branch, title, body, and reviewers before proceeding.")
return "\n".join(lines)
if __name__ == "__main__":
sys.exit(main())
|
