From: Leslie Viljoen <leslieviljoen@...>
Date: 2008-06-08T02:34:31+09:00
Subject: Glader: quick .glade -> Ruby

Here's a tiny script I wrote to go the last mile when generating Ruby
programs to make
use of Glade forms. The ruby-glade-create-template program that comes in the
libglade2-ruby.18 package creates an example program that will be
overwritten each
time the script is re-run.

Glader makes a script that uses the example program, allowing you to
repeatedly save
your .glade file, convert it and "run" it to see changes.

I hope that makes sense to *someone*


Example session:
----------------------
lesliev@lesliev-laptop:~/glade_test/calbox$ ./glader.rb layout.glade
Making class file (layout_glade.rb)...
Making main file (layout.rb)...

lesliev@lesliev-laptop:~/glade_test/calbox$ ruby layout.rb    (to play
with the form)

...now you can edit and re-save your .glade form and quickly regen
without overwriting any of your changes to layout.rb by running glader again.


Glader:
---------

#!/usr/bin/ruby -w

# This class is a quick way of creating a runnable Ruby program from
# a single Glade form.
#
class Glader
	def initialize(glade_filename)
		raise ArgumentError.new("File missing: #{glade_filename}") if
!File.exist?(glade_filename)
		raise ArgumentError.new("Not a .glade file: #{glade_filename}") if
glade_filename !~ /.*\.glade/

		@glade_filename = glade_filename
		@base_filename = File.basename(@glade_filename, ".glade")
		@class_filename = @base_filename + "_glade.rb"
	end

	# Runs the ruby-glade-create-template script to create a file with a
	# class that corresponds to the form. This can be called repeatedly
	# to keep creating the class every time the .glade file changes.
	#
	def make_class
		`/usr/bin/ruby-glade-create-template #{@glade_filename} > #{@class_filename}`
		@class_filename
	end

	# Creates a main program that uses the glade class created with
	# _make_class_ and opens the window with the form. It will do nothing
	# if the main program file already exists, since the user is likely
	# to add code to this file.
	#
	def make_main
		main_filename = @base_filename + '.rb'

		if(File.exist?(main_filename))
			raise ArgumentError.new("#{main_filename} already exists, skipping")
		else
			File.open(main_filename, "w") {|f| f.write generate_main}
		end
		main_filename
	end

	private
	def generate_main()
		class_name = File.read(@class_filename).scan(/class (.*)/).to_s	
		window_id = File.read(@glade_filename).scan(/class="GtkWindow"
id="(\w*)">/).to_s

		main =<<END

require '#{@base_filename}_glade'

class #{class_name}
	def show
		@glade["#{window_id}"].show
	end

	#if this signal exists, exit nicely
	#
	def on_#{window_id}_destroy(widget)
		Gtk.main_quit
  end
end

form = #{class_name}.new("#{@glade_filename}", nil, "Application")
form.show

Gtk.main

END
	end
end

if __FILE__ == $0
	if ARGV.length != 1
		puts
		puts "This script creates a class and a main program that shows a
window using"
		puts "that class from a .glade file. It can be used to quickly
generate a functional Ruby"
		puts "program from a .glade file"
		puts
		puts "Usage: #{__FILE__} <file.glade>"
		puts
		exit
	end

	glader = Glader.new(ARGV[0])
	print "Making class file (#{glader.make_class})...\n"

	begin
		print "Making main file (#{glader.make_main})...\n"
	rescue => e
		puts e.message
	end
	puts

end