#!/usr/bin/env ruby
require 'rexml/document'
require 'net/http'

# Customize these values: 
  # Your backpack account:
ACCOUNT = "yourbackpacksubdomain"
  # Your backpack user id:
USER_ID = 123456
  # Your token (you might want to put this in a shell variable):
TOKEN   = '1234567890987654321234567890987654321'
PROJECT = "my-project"

GIT     = `which git`.strip

def build_commit_message
  text = `#{GIT} log --all -n 1`
  lines = text.split("\n\ncommit ")

  revision = text[/([a-f0-9]{32})/]
  commit_author  = `#{GIT} show --pretty=format:"%an" #{revision} | sed q`.chomp
  commit_log     = `#{GIT} show --pretty=format:"%s" #{revision}  | sed q`.chomp
  # Additional useful data...
  # commit_date    = `#{GIT} show --pretty=format:"%aD" #{revision} | sed q`.chomp
  # commit_changed = `#{GIT}-diff-tree --name-status #{revision}    | sed -n '$p'`
  
  "[#{PROJECT}] #{commit_log}"
end

# Build the Backpack xml snippet:
def build_request(message)
  doc = REXML::Document.new
  request = doc.add_element 'request'
  request.add_element('token').add_text TOKEN
  journal_entry = request.add_element('journal-entry')
  journal_entry.add_element('body').add_text(message)
  return doc
end

# Post the request to Backpack:
def send_to_journal(message)
  doc = build_request(message)
  http = Net::HTTP.new("#{ACCOUNT}.backpackit.com")
  response = http.post("/users/#{USER_ID}/journal_entries.xml", doc.to_s, {'Content-Type' => 'application/xml'})
end

# Do it:
send_to_journal(build_commit_message)