Jamm Them Assets

pre-commit

#!/usr/bin/env ruby

require 'jammit'

print "JAMMIT: Looking for changes to tracked assets... "
# take a look at the status before compression
status_before = %x[git status --porcelain --untracked-files=no]
# package changed assets
Jammit.package!
# now take a look at the status after compressing assets
status_after = %x[git status --porcelain --untracked-files=no]
# compare the status before and after compressing
jammit_files = (status_after.split("\n") - status_before.split("\n")).map { |f| f.split[1] }
# if there's no difference, there's nothing to add to the commit
# but if there is a difference, Jammit has compressed something
if !jammit_files.empty?
  # give feedback as to what just happened
  puts "\nPackaged #{jammit_files.count} files.\nAdding packaged files to the commit:"
  jammit_files.each do |file|
    puts file
  end
  # and then add the newly-changed files to the commit
  `git add #{jammit_files.join(' ')}`
else
  puts "and there aren't any."
end
exit 0