Class: FileWatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/filewatcher.rb

Overview

Simple file watcher. Detect changes in files and directories.

Issues: Currently doesn’t monitor changes in directorynames

Instance Method Summary collapse

Constructor Details

#initialize(filenames, print_filelist = false) ⇒ FileWatcher

Returns a new instance of FileWatcher.



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# File 'lib/filewatcher.rb', line 6

def initialize(filenames,print_filelist=false)
  if(filenames.kind_of?String)
    filenames = [filenames]
  end

  filenames = expand_directories(filenames)

  if(print_filelist)
    if(print_filelist.kind_of?String)
      puts print_filelist
    else
      puts "Watching:"
    end
    filenames.each do |filename|
      puts filename
    end
  end

  @last_mtimes = { }
  filenames.each do |filename|
    raise "File does not exist" unless File.exist?(filename)
    @last_mtimes[filename] = File.stat(filename).mtime
  end
  @filenames = filenames
end

Instance Method Details

#expand_directories(filenames) ⇒ Object 



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# File 'lib/filewatcher.rb', line 52

def expand_directories(filenames)
  files = []
  filenames.each do |filename|
    if(File.directory?(filename))
      files = files + find(filename)
    end
    if(File.file?(filename))
      files << filename
    end
  end
  filenames = files
end

#file_updated? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/filewatcher.rb', line 39

def file_updated?
  @filenames.each do |filename|
    mtime = File.stat(filename).mtime
    updated = @last_mtimes[filename] < mtime
    @last_mtimes[filename] = mtime
    if(updated)
      @updated_file = filename
      return true
    end
  end
  return false
end

#find(dir, filename = "*.*", subdirs = true) ⇒ Object 



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# File 'lib/filewatcher.rb', line 65

def find(dir, filename="*.*", subdirs=true)
  Dir[ subdirs ? File.join(dir.split(/\\/), "**", filename) : File.join(dir.split(/\\/), filename) ]
end

#watch(sleep = 1, &on_update) ⇒ Object 



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# File 'lib/filewatcher.rb', line 32

def watch(sleep=1, &on_update)
  loop do
    Kernel.sleep sleep until file_updated?
    yield @updated_file
  end
end