git hook to run a command after `git pull` if a specified file was changed.In this example it's used to run `npm install` if package.json changed and `bower install` if `bower.json` changed.Run `chmod +x post-merge` to make it executable then put it into `.git/hooks/`.

post-merge

#!/usr/bin/env bash

changed_files="$( git diff-tree -r --name-only --no-commit-id origin/master HEAD)"

changed() {
	echo "$changed_files" | wc -l | grep --quiet "[123456789]*" && eval "$1"
}
check_run() {
	echo "$changed_files" | grep --quiet "$1" && eval "$2"
}

# Example usage
# In this example it's used to run `npm install` if package.json changed
check_run package.json "npm install"
changed "service spottydev restart"