A git hook to run checks and commands automatically after `git pull`

post-merge

#!/usr/bin/env bash
# MIT © Sindre Sorhus - sindresorhus.com

# git hook to run a command after `git pull` if a specified file was changed
# Run `chmod +x post-merge` to make it executable then put it into `.git/hooks/`.

changed_files=$(git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD)

check_run() {
  echo "${changed_files}" | grep --quiet "$1" && eval "$2"
}

# Run `npm install` if package.json changed and/or `bower install` if `bower.json` changed.
check_run package.json "npm install"
check_run bower.json "bower install"

# Updating git submodules
check_run .gitmodules "git submodule init && git submodule update"