RStakeout

gistfile1.rb

#!/usr/bin/env ruby
 
# Originally by Mike Clark.
#
# From http://www.pragmaticautomation.com/cgi-bin/pragauto.cgi/Monitor/StakingOutFileChanges.rdoc
#
# Runs a user-defined command when files are modified.
#
# Can use Ruby's Dir[] to get file glob. Quote your args to take advantage of this.
#
# rstakeout 'rake test:recent' **/*.rb
# => Only watches Ruby files one directory down (no quotes)
#
# rstakeout 'rake test:recent' '**/*.rb'
# => Watches all Ruby files in all directories and subdirectories
#
# Modified by James Penn
# - (27 AUG 08) Removed Growl::Notify etc
# - (04 MAY 09) Added logic to handle new/deleted files
 
@command = ARGV.shift
@splats = ARGV
@files = {}
 
def find_new_files(verbose=true)
  # check for new files matching the splats
  @splats.each do |splat|
    Dir[splat].each do |file|
      unless @files[file]
        @files[file] = File.mtime(file)
        puts "=> adding new file #{file} to the watch list" if verbose
      end
    end
  end
end
 
find_new_files false
puts "=> watching #{@files.keys.join(', ')}\nfile count: #{@files.keys.length}"
 
trap('INT') do
  puts "\n=> quitting..."
  exit
end
 
 
loop do
 
  sleep 1
  
  find_new_files
 
  changed_file, last_changed = @files.find { |file, last_changed|
    begin
      File.mtime(file) > last_changed
    rescue Exception => e
      @files.delete file
      puts "=> removing deleted file #{file} from the watch list."
    end
  }
 
  if changed_file
    @files[changed_file] = File.mtime(changed_file)
    puts "=> #{changed_file} changed, running #{@command}"
    results = `#{@command}`
    puts results
 
    puts "=> done"
  end
end