Envclean helps nuke and reseed a ruby environment for development purposes using rbenv and bundler. Add it to your PATH.

envclean.sh

#!/bin/sh

set -o nounset
set -o errexit

help() {
printf "envclean - managing ruby environments

envclean list                   list available ruby versions (uses rbenv).
envclean for RUBY_VERSION       cleans and initializes a specific ruby version.
"
}

remove_gems() {
	gem list | grep -v '[test\-unit|rdoc|rake|psych|minitest|io-console|json|bigdecimal]' | cut -d" " -f1 | xargs gem uninstall -aIx
}

ensure_bundler() {
	if [ "x$(gem list |grep bundler)x" == "xx" ] ; then
		gem install bundler --no-rdoc --no-ri
	fi
}

# Define macros
switch_to() {
	local version=$1
	printf "Switching to ruby $version\n"
	rbenv local $version
	remove_gems
	ensure_bundler
	if [ -d .bundle ] ; then
		printf "Rebuilding bundles..."
		rm -rf .bundle && bundle
	fi

}

list_versions() {
	ls ~/.rbenv/versions
}

envclean_for() {
	for v in $(list_versions)
	do
		#SHORTHAND=$(printf $v | cut -d'-' -f 1)
		if [ $1 = $v ] ; then
			read -p "This will delete bundles, continue? (y/n) " yn
			case $yn in
					[Yy]* )
						switch_to $v
					;;
					[Nn]* )
						exit 0
					;;
					* )
						exit 0
					;;
			esac
			break;
		fi
	done
}

# Process options

if [ ! -d .git ] ; then
	printf "Not a git repository.\n"
	exit 1
fi

if [ -z "$*" ] ; then
	help
	exit 1
fi

if [ $1 = 'list' ] ; then
	list_versions
	exit 0
fi

if [ $1 = 'for' ] ; then
	envclean_for $2
	exit 0
fi