Modification of @abachman's helpful groutes utility to add branch support

groutes

#!/bin/bash

# groutes greps routes
#
# the first time you run routes it runs bin/rails routes and caches it and
# greps that. if you update config/routes.rb, groutes _knows_ and rebuilds
# the cache.
#
# usage:
#   $ groutes username
#                username GET     /:username(.:format)                              dashboards#show
#          username_feeds GET     /:username/feeds(.:format)                        feeds#index
#    username_group_feeds GET     /:username/groups/:group/feeds(.:format)          groups#feeds
#           username_feed GET     /:username/feeds/:id(.:format)                    feeds#show
#                         GET     /:username/dashboards/:dashboard_id(.:format)     dashboards#show
#      username_dashboard GET     /:username/:dashboard_id(.:format)                dashboards#show
#
# if you ctrl-c, you'll probably have to delete the cache files and start over
#   $ rm .rails_routes*
#
# add the two cache files to .gitignore
#   $ echo .rails_routes* >> .gitignore

export BRANCH=$(git branch --show-current)
export CACHE_FILESPEC=".rails_routes_$BRANCH~"
export ROUTES_RB_REFERENCE_FILESPEC=".rails_routes_rb_$BRANCH~"


if [ ! -f Rakefile -o ! -f config/routes.rb ]; then
  echo "groutes will only work in rails project directories :("
  exit 1
fi

if [ ! -f $CACHE_FILESPEC ]; then
  echo "generate routes because cache doesn't exist"
  bundle exec rake routes > $CACHE_FILESPEC
fi

if [ ! -f $ROUTES_RB_REFERENCE_FILESPEC ]; then
  echo "regenerate routes because config/routes.rb is newer than cache"
  cp config/routes.rb $ROUTES_RB_REFERENCE_FILESPEC
  bundle exec rake routes > $CACHE_FILESPEC
else
  diff -q config/routes.rb $ROUTES_RB_REFERENCE_FILESPEC
  diff_status=$?

  if [ "$diff_status" -ne 0 ]; then
    echo "regenerate routes because config/routes.rb doesn't match previous version"
    cp config/routes.rb $ROUTES_RB_REFERENCE_FILESPEC
    bundle exec rake routes > $CACHE_FILESPEC
  fi
fi

cat $CACHE_FILESPEC