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#!/bin/sh
# Strip Co-authored-by trailers whose identity looks like a coding agent
# (Copilot, Claude, Codex, ChatGPT, Cursor, Aider, Devin, ...). Various
# tools — GitHub Copilot CLI, VS Code chat, etc. — append these
# automatically and they then trip the pre-push hook's agent check.
# Easier to scrub at commit time than to amend later.
#
# Activated via core.hooksPath in ~/.config/git/config so it applies to
# every repo unless that repo overrides hooksPath itself.
#
# Bypass: git commit --no-verify
set -eu
msg_file=$1
# Keep this list in sync with executable_pre-push.
agent_subs='copilot claude codex chatgpt cursor aider devin [bot] @openai. @anthropic.'
# Rewrite the message file, dropping any Co-authored-by line whose
# lowercased content contains an agent substring. We deliberately
# operate line-by-line rather than on trailer blocks because the file
# already includes git's auto-generated comment block (`# ...`) and we
# don't want to touch any of that.
tmp=$(mktemp)
trap 'rm -f "$tmp"' EXIT INT TERM
awk -v agent_subs="$agent_subs" '
BEGIN { n = split(agent_subs, subs, " ") }
function is_agent(s, i) {
for (i = 1; i <= n; i++) if (index(s, subs[i])) return 1
return 0
}
{
# Match the trailer case-insensitively but keep the original
# casing for everything we pass through.
lower = tolower($0)
if (lower ~ /^co-authored-by:[[:space:]]/ && is_agent(lower)) {
stripped = 1
next
}
print
}
END { exit stripped ? 10 : 0 }
' "$msg_file" >"$tmp" && rc=0 || rc=$?
# awk exits 10 only when we actually dropped a line; anything else is
# treated as a real error.
case $rc in
0) exit 0 ;;
10) ;;
*) printf 'commit-msg: awk failed (rc=%d); leaving message untouched.\n' "$rc" >&2; exit 0 ;;
esac
# Collapse any trailing blank lines produced by the removal so we don't
# leave a dangling blank trailer block.
sed -e :a -e '/^$/{$d;N;ba' -e '}' "$tmp" >"$msg_file"
printf 'commit-msg: stripped AI Co-authored-by trailer(s).\n' >&2
exit 0
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