#!/bin/bash
#
# Purpose : coredesktop-dev hooks: install or remove the working copy's pre-push
#           hook, which runs coredesktop-dev check before each push

hooks_usage() {
  cat << EOF
Usage: coredesktop-dev hooks [status|install|remove]

  status    Show whether the pre-push hook is installed (the default)
  install   Run coredesktop-dev check before each git push from the working copy
  remove    Remove that hook

git push --no-verify skips the hook for one push. A pre-push hook that
coredesktop-dev didn't install is never replaced or removed.
EOF
}

# Where git looks for the working copy's pre-push hook (core.hooksPath aware)
hook_path() {
  local path
  path="$(git -C "$WORKING_COPY" rev-parse --git-path hooks/pre-push)" || return 1
  [[ "$path" == /* ]] || path="$WORKING_COPY/$path"
  echo "$path"
}

hook_is_ours() {
  [ -f "$1" ] && grep -qxF "$HOOK_MARKER" "$1"
}

cmd_hooks() {
  local hook
  case "${1:-status}" in
    -h | --help) hooks_usage; return 0 ;;
    status | install | remove) ;;
    *) hooks_usage >&2; return 1 ;;
  esac
  require_working_copy
  hook="$(hook_path)" || die "Couldn't find the working copy's git hooks folder."

  case "${1:-status}" in
    status)
      if hook_is_ours "$hook"; then
        echo "The pre-push hook is installed: $hook"
      elif [ -e "$hook" ]; then
        echo "$hook is someone else's hook; coredesktop-dev leaves it alone."
      else
        echo "The pre-push hook isn't installed. To install it: coredesktop-dev hooks install"
      fi
      ;;
    install)
      if [ -e "$hook" ] && ! hook_is_ours "$hook"; then
        die "$hook already exists and coredesktop-dev didn't write it, so it's left alone."
      fi
      mkdir -p "$(dirname "$hook")"
      install -m 755 "$(sibling_dir)/hooks/pre-push" "$hook"
      echo "Installed $hook: each git push now runs coredesktop-dev check first."
      ;;
    remove)
      if hook_is_ours "$hook"; then
        rm "$hook"
        echo "Removed $hook."
      elif [ -e "$hook" ]; then
        die "$hook isn't coredesktop-dev's, so it's left alone."
      else
        echo "The pre-push hook isn't installed."
      fi
      ;;
  esac
}