.git.prepare-commit-msg-hook

#!/bin/bash
[[ -z "$1" ]] && exit 0

tmp="$1".hook-tmp

cp "$1" "$tmp"
sed -i '/^[[:space:]]*\(#\|$\)/d' "$1"
[[ -s "$1" ]] || echo >"$1"

echo >>"$1"
echo '# ¯\_ ⅁OꞀƎ⅁NⱯHƆ Ǝ⊥ⱯᗡԀ∩ O⊥ ⊥Ǝ⅁ᴚOᖵ ⊥ON Oᗡ _/¯' >>"$1"
echo '#' >>"$1"

echo '#' >>"$1"
sed -i '/^[[:space:]]*#/!d' "$tmp"
cat "$tmp" >> "$1"
rm -f "$tmp"

echo '# Previous commits:' >>"$1"
git log -10 --format='#   %s' >>"$1"