hook-it

#!/usr/bin/env bash

# Application variables
DEFAULT_HOOKS_DIR="${DEFAULT_HOOKS_DIR:-.git/hooks}"
REPO=

# General variables
ASSUMEYES=1
FORCE=0
NOOP=
ERROR=
VERBOSE=0
ARGS=()

GIT=${GIT:-git}

source hooks/common/functions.sh

function is_git() {
  [[ ! -d $1 ]]      && ERROR="Folder $REPO does not exist" && return 1
  [[ ! -d $1/.git ]] && ERROR="Folder $REPO is not a git repository" && return 2
	return 0
}

function inject_hooks() {
  local status
  local language
  local hooks_path
  local repo=$1

  # 0/ validation
  is_git $repo || return $?
  verbose "Injecting git hooks into $repo"

  # 1/ make sure git flow is initialized
  if [[ -z $($GIT -C $repo config gitflow.branch.master) ]]; then
    verbose "Initializing git flow in repository $repo"
    $NOOP $GIT -C $repo flow init -d --tag v
    status=$? ; (( status )) && ERROR="Error while initializing git flow in repository $REPO" && return $status
  fi
  hooks_path=$($GIT -C $repo config gitflow.path.hooks)
  if [[ -z $hooks_path ]]; then
    ERROR="git flow AVH edition is needed for this to work" && return 1
  fi
  hooks_path="${repo}/${DEFAULT_HOOKS_DIR}" # Resetting the hooks folder, in case the repo was moved

  # 2/ configure git flow
  verbose "Configuring gitflow"
  $NOOP $GIT -C $repo config gitflow.path.hooks             "$hooks_path"
  $NOOP $GIT -C $repo config gitflow.prefix.versiontag      "v"
  $NOOP $GIT -C $repo config gitflow.hotfix.finish.message  "Hotfix %tag%"
  $NOOP $GIT -C $repo config gitflow.release.finish.message "Release %tag%"

  if [[ -z $($GIT -C $repo config --get gitflow.allow-master-commit) ]]; then
    $NOOP $GIT -C $repo config gitflow.allow-master-commit false
  fi

  if [[ -z $($GIT -C $repo config --get gitflow.allow-conflict-commit) ]]; then
    $NOOP $GIT -C $repo config gitflow.allow-conflict-commit false
  fi

  # 3/ find language
  if [[ -e $repo/package.json ]]; then
    language="node"
  elif [[ -e $repo/go.mod ]]; then
    language="go"
  else
    ERROR="Unable to find language for $repo" && return 1
  fi
  verbose "Language: $language"

  # 3/ copy hooks
  if [[ ! -d $hooks_path ]]; then
    $NOOP mkdir -p $hooks_path
    status=$? ; (( status )) && ERROR="Error while creating hooks folder $hooks_path" && return $status
  fi
  verbose "Copying hooks"
  $NOOP cp -f hooks/common/* $hooks_path/
  status=$? ; (( status )) && ERROR="Error while copying common hooks to $hooks_path" && return $status
  $NOOP cp -f hooks/$language/* $hooks_path/
  status=$? ; (( status )) && ERROR="Error while copying $language hooks to $hooks_path" && return $status
  return 0
}

function usage() {
  echo "Usage: $0 [options] <repository>"
  echo "Options:"
  #echo "  -r, --recursive   Inject hooks in all subfolders"
  echo "  -h, --help        Display this help message"
  echo "  --noop, --dry-run Do not execute any command, just display what would be done"
  echo "  --quiet           Do not display any message"
  echo "  -v, --verbose     Increase verbosity"
  echo "  -y, --yes         Assume yes to all questions"
}

function parse_args() {
  local parse_config="${1};"
  declare -A options
  shift

  while [[ $parse_config ]]; do
    local option_config=${parse_config%%;*}
    local option_names="${option_config%%=*},"
    local option_code=${option_config#*=}

    while [[ $option_names ]]; do
      local option_name=${option_names%%,*}

      if [[ ${#option_name} == 1 ]]; then
        options["-${option_name}"]="${option_code}"
      else
        options["--${option_name}"]="${option_code}"
      fi
      option_names=${option_names#*,}
    done
    parse_config=${parse_config#*;}
  done

  while (( "$#" )); do
    # Replace --parm=arg with --parm arg
    [[ $1 == --*=* ]] && set -- "${1%%=*}" "${1#*=}" "${@:2}"
    if [[ -n ${options[$1]} ]]; then
      local action=${options[$1]}
      if [[ ${action:0:1} == "*" ]]; then
        [[ -z $2 || ${2:0:1} == '-' ]] && die "Argument for option $1 is missing"
        eval "${action:1}=$2"
        shift 2
        continue
      else
        eval "${action}=1"
      fi
    else
      case $1 in
        # Standard options
        --force)
          warn "This program will force operations to be executed"
          FORCE=1
          ;;
        --help|-h|-\?)
          usage
          exit 0
          ;;
        --noop|--dry_run|--dry-run)
          warn "This program will execute in dry mode, your system will not be modified"
          NOOP=:
          ;;
      --quiet)
        VERBOSE=0
        ;;
      -v|--verbose)
        VERBOSE=$((VERBOSE + 1))
        ;;
      -y|--yes|--assumeyes|--assume_yes|--assume-yes)
        ASSUMEYES=1
        ;;
      -?*|--*=) # Invalid options
        warn "Unknown option $1 will be ignored"
        ;;
      --) # Force end of options
        shift
        break
        ;;
      *)  # Positional Argument
        ARGS+=( "$1" )
        ;;
      esac
    fi
    shift
  done
}

function main() {
  parse_args "r,recursive=RECURSIVE" "$@"

  # Set all positional arguments back in the proper order
  eval set -- "${ARGS[@]}"

  inject_hooks "$1" || die "$ERROR"
}

main "$@"