#!/bin/sh
# Reject a commit that contains unformatted Ludic — in source or in the ```ludic
# fences of a Markdown file.
#
# Enable this and the commit-msg hook together with:
#
#   git config core.hooksPath tools/git-hooks
#
# Checks only the files being committed, so it stays fast on a big tree.
set -e
ROOT=$(git rev-parse --show-toplevel)
FMT="$ROOT/bin/ludic-fmt"

[ -x "$FMT" ] || exit 0        # toolchain not built: do not block the commit

FILES=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(ludic|md|markdown)$' || true)
[ -z "$FILES" ] && exit 0

UNFORMATTED=""
for f in $FILES; do
  [ -f "$ROOT/$f" ] || continue
  "$FMT" --check -q "$ROOT/$f" >/dev/null 2>&1 || UNFORMATTED="$UNFORMATTED $f"
done

if [ -n "$UNFORMATTED" ]; then
  echo "unformatted Ludic:"
  for f in $UNFORMATTED; do echo "  $f"; done
  echo
  echo "fix with:  build/ludic-fmt -w$UNFORMATTED"
  exit 1
fi