Installation script for pre-commit/pre-push hooks

install.sh

#!/usr/bin/env bash
# Installs all project Git hooks.
# Author: Eric Weinstein <eric.q.weinstein@gmail.com>

set -e

# Output colors
error() {
  echo -e "\033[0;31m[!] $1\033[0;m"
}
warn() {
  echo -e "\033[0;33m[-] $1\033[0;m"
}
warn_and_confirm() {
  echo -ne "\033[0;33m[-] $1\033[0;m"
}
ok() {
  echo -e "\033[0;32m[\xE2\x9C\x93] $1\033[0;m"
}
info() {
  echo -e "\033[0;35m[+] $1\033[0;m"
}

TARGET_DIR="../../.git/hooks"

# Check for .git/hooks relative to this directory
check_dir() {
  if [[ ! -d $TARGET_DIR ]]; then
    error 'Could not locate Git hooks directory.'
    info 'Ensure you have a .git/hooks directory in your project root and that you are running this script from within the /scripts/git_hooks directory.'
    exit 1
  fi
}

# Check to make sure we're not overwriting existing hooks
check_overwrite() {
  if [[ -e "$TARGET_DIR/$1" ]]; then
    warn_and_confirm "You have an existing $1 hook; this script will overwrite it. Is this OK? [Y/N]: "
    read response
    case $response in
      [nN] | [nN][Oo] )
        error "Skipping $1 hook installation."
        return 1
        ;;
      [yY] | [yY][Ee][Ss] )
        return 0
        ;;
      * )
        error "Default: skipping $1 hook installation due to invalid input."
        return 1
        ;;
    esac
  fi
}

# Copy hooks to .git/hooks
install_hooks() {
  check_dir

  for file_path in $PWD/*; do
    filename=$( echo $file_path | tr '/' '\n' | tail -n '1' )

    # Don't install the installation script itself
    if [[ $file_path != "$PWD/install" ]]; then
      if check_overwrite $filename; then
        info "Installing $filename hook..."
        chmod +x $filename
        cp $file_path $TARGET_DIR
        ok "Successfully installed $filename hook."
      fi
    fi
  done
  ok "Done."
}

install_hooks