#!/usr/bin/env bash

set -euo pipefail
# Disable glob expansion to handle brackets in file paths
set -f
usage() {
  printf 'Usage: %s "commit message" "file" ["file" ...]\n' "$(basename "$0")" >&2
  exit 2
}

if [ "$#" -lt 2 ]; then
  usage
fi

commit_message=$1
shift

if [[ "$commit_message" != *[![:space:]]* ]]; then
  printf 'Error: commit message must not be empty\n' >&2
  exit 1
fi

if [ -e "$commit_message" ]; then
  printf 'Error: first argument looks like a file path ("%s"); provide the commit message first\n' "$commit_message" >&2
  exit 1
fi

if [ "$#" -eq 0 ]; then
  usage
fi

files=("$@")

for file in "${files[@]}"; do
  if [ ! -e "$file" ]; then
    if ! git ls-files --error-unmatch -- "$file" >/dev/null 2>&1; then
      printf 'Error: file not found: %s\n' "$file" >&2
      exit 1
    fi
  fi
done

git restore --staged :/
git add --force -- "${files[@]}"

if git diff --staged --quiet; then
  printf 'Warning: no staged changes detected for: %s\n' "${files[*]}" >&2
  exit 1
fi

git commit -m "$commit_message" -- "${files[@]}"

printf 'Committed "%s" with %d files\n' "$commit_message" "${#files[@]}"
