Bash function to quickly install / update a WordPress plugin / theme and commit the addition in Git. Shove this in your .bashrc.

wpadd

# Bash function to quickly install / update a plugin / theme and commit the addition.
#
# Function should be run from the root WP directory.
#
# Requires:
# wp-cli - http://wp-cli.org; should be used as 'wp'
# git    - duh'doy! :)
#
# Usage:
# wpadd -slug "slug-of-item" -new "1.0.0"
#
# slug  - Plugin or theme slug that you want to install / update from wp.org
# type  - Whether we're dealing with a plugin or theme.  Either 'plugin' or 'theme'. Default: 'plugin'
# new   - Version you want to install or update
# prev  - Previous version of the plugin or theme.  This is used only for the commit message.
# skip  - Skips updating.  Useful if you want to just add the files in Git and commit.
#         Enter any value if you want to skip, otherwise omit this parameter.
# msg   - (optional) Appends an additional message to the end of the commit message.
# debug - Echo the commands. Used for internal debugging.
#
# Example:
# wpadd -slug akismet -new 3.0.4             - Installs 'akismet' and commits the changes
# wpadd -slug akismet -new 3.0.4 -prev 3.0.3 - Updates 'akismet' to 3.0.4 and commits the changes detailing both versions
# wpadd -slug akismet -new 3.0.4 -prev 3.0.3 -skip 1 - Adds the 'akismet' directory in Git and commits the changes detailing both versions
function wpadd() {
	local action="install"
	local type="plugin"
	local slug=""
	local new=""
	local prev=""
	local message=""
	local msg=""
	local skip=""
	local debug=""

	local wp=""
	local gitadd=""
	local gitcommit=""

	while test $# -gt 0; do
		case "$1" in
			-action)
				shift
				action=$1
				shift
				;;
			-type)
				shift
				type=$1
				shift
				;;
			-slug)
				shift
				slug=$1
				shift
				;;
			-new)
				shift
				new=$1
				shift
				;;
			-prev)
				shift
				prev=$1
				shift
				;;
			-msg)
				shift
				msg=$1
				shift
				;;
			-skip)
				shift
				skip=$1
				shift
				;;
			-debug)
				shift
				debug=1
				shift
				;;
			*)
				echo "$1 is not a recognized flag!"
				exit 1;
				;;
		esac
	done  

	# prev
	if [ "$prev" ]; then
		action="update"

		wp="wp $type $action $slug --version=$new"
	else
		wp="wp $type $action $slug"
	fi

	if [ -z "$skip" ]; then
		if [ "$debug" ]; then
			echo $wp
		else
			eval $wp
		fi
	fi

	gitadd="cd wp-content/${type}s/$slug && git add -A . && cd ../../../"
	if [ "$debug" ]; then
		echo $gitadd
	else
		eval $gitadd
	fi


	if [ "$action" == "update" ]; then
		message="-m 'Update $type: $slug'"
	else
		message="-m 'Install $type: $slug'"
	fi

	message+=" -m 'New version: $new'"

	if [ "$prev" ]; then
		message+=" -m 'Previous version: $prev'"
	fi

	if [ "$msg" ]; then
		message+=" -m '$msg'"
	fi

	gitcommit="git commit $message"

	if [ "$debug" ]; then
		echo $gitcommit
	else
		eval $gitcommit
	fi
}