#!/usr/bin/env bash
# Strip Claude/agent co-author trailers that don't belong on Bizar commits.
#
# Why: Claude Code's CLI appends "Co-Authored-By: Claude <noreply@anthropic.com>"
# by default; older Bizar release docs also templated Norse/office-agent
# personas as co-authors. This repo's commits should only carry the human
# author identity. Any matching trailers get removed before the commit lands.
#
# To bypass in an emergency: git commit --no-verify
set -euo pipefail

msg_file="$1"
tmp="$(mktemp)"
trap 'rm -f "$tmp"' EXIT

# Remove the two known offender trailers (case-insensitive on the header).
# Also strip any Co-authored-by: line whose email ends in @anthropic.com
# or @polderlabs.dev — defense-in-depth against future variations.
sed -E \
  -e '/^[Cc]o-[Aa]uthored-[Bb]y:[[:space:]]*Claude <noreply@anthropic\.com>[[:space:]]*$/d' \
  -e '/^[Cc]o-[Aa]uthored-[Bb]y:[[:space:]]*[^<]*<(noreply@anthropic\.com|noreply@polderlabs\.dev)>$/d' \
  "$msg_file" > "$tmp"

# Collapse runs of blank lines that may result from trailer removal.
awk 'BEGIN { blank=0; seen=0 } {
  if ($0 == "") { blank++ }
  else {
    if (blank > 0 && seen) print "";
    blank=0; print; seen=1
  }
}' "$tmp" > "${tmp}.2"
mv "${tmp}.2" "$tmp"

if ! cmp -s "$msg_file" "$tmp"; then
  echo "commit-msg: stripped Claude/agent co-author trailers" >&2
fi

mv "$tmp" "$msg_file"