git commit hook that modifies the commit message to include links to Pivotal Tracker stories when issue number is included

commit-msg

#!/usr/bin/env ruby

PREFIX = "https://www.pivotaltracker.com/story/show/"
fn = ARGV.first
sids = []
File.open(fn) do |f|
  f.each do |line|
    next if line =~ /^#/
    line.scan(/\[[^#]*#(\d+)\s*\]/) {|a| sids += a }
  end
end
story_links = sids.map {|i| PREFIX + i }.join("\n")
msg = File.read(fn) + "\n" + story_links
File.open(fn, 'w') {|f| f.puts msg }