Git hook to call `bower install` and `npm install` automatically.

post-rewrite

#!/bin/sh
echo "[post-rewrite hook: $1]"

# by noahgrant & digitaljhelms
#
# quick script to call "bower install" and "npm install" automatically if
# bower.json or package.json are changed, respectively
#
# this assumes one top-level file for each

changedfiles=( `git diff-tree --no-commit-id --name-only HEAD@{1} HEAD` )

if [[ "${changedfiles[*]}" =~ "bower.json" ]]; then
    echo "bower installing"
    bower install && bower update
fi

if [[ "${changedfiles[*]}" =~ "package.json" ]]; then
    echo "npm installing"
    npm install
fi

Thanks for sharing!

There is a minor issue: you should change #!/bin/sh to #!/bin/bash, or you'll get a syntax error. Maybe something is not POSIX compliant, and does not work with "basic" shells like dash.