push_couch_app_on_change.rb

# Scans a CouchApp folder for changes, and on detection auto pushes to Couch 
# this allows you to simply save your JS files and test them from CLI without re-loading manually every time

# (c) Steve Midgley 2011
# Released under Apache 2.0 license 
# (http://www.apache.org/licenses/LICENSE-2.0.html)

require 'rake'
def running_windows?
  !(RUBY_PLATFORM =~ /win32/).nil?
end
# set cmd_line to run on file change based on platform (windows needs ".bat" ext)
cmd_line = running_windows? ? "couchapp.bat push" : "couchapp push"

puts "Working folder: #{Dir::pwd}"
# monitor current folder and all subs for any file changes. On file change issue "couchapp push"
keep_running = true
while keep_running do
  # Loop until interrupted by ctrl-c
  trap("INT") { puts "\nExiting"; keep_running = false; exit;}
  test_list = FileList['./**/*']
  orig_dates = {}
  test_list.each do |file|
    orig_dates[file] = File.stat(file).mtime
  end
  # loop through test_list looking for date changes
  test_file = ""
  keep_searching = true
  while keep_searching && keep_running do
    print "\r**** Waiting for file changes. (#{Time::now.strftime('%b %d %I:%M:%S %p')}), ctrl-c exits"
    Kernel::sleep(0.3) # wait 3/10 second between searches for changed files
    test_list.each do |file|
      Kernel::sleep(0.05) # keep the cpu/disk from maxing out with short pause between each file read
      if orig_dates[file] != File.stat(file).mtime
        puts "\n  File change detected: #{file}"
        puts "  Time is: #{Time::now}"
        keep_searching = false
        test_file = file
        break
      end
    end
    if test_file != "" && keep_running
      # invoke the test b/c the file has changed
      puts "Pushing code due to file change in file #{test_file}..."
      puts `#{cmd_line}`
    end
  end # while keep_searching... -- change detection loop
end # while keep_running do -- main loop