From: "Shangz B." <shangbaby@...>
Date: 2011-03-19T04:35:18+09:00
Subject: Re: "10 Minutes to Your First Ruby Application" Deconstructed!

Muchos Gracias Jesus I do appreciate your time. Thank you for responding 
to my post.


Thank you Jesus, :( unfortunately I got syntax errors and no launch of
the application. So, wherever the word 'file' appears should I put in
its place, "launcher"...?  Will I have to substitute 'rb' wherever
file_type() appears? When I took out the "launcher=Launcher.new" it gave
syntax errors as with placing the end after everything. Excuse me for
being thick. I really would like to understand. And just so I don't bug 
you too much is there any other place I can get an explanation of this 
particular or a breakdown of this tutorial line-by-line? I attempted the 
"Ruby Syntax" link, but I need a reference as I go through this 
tutorial.

Thanks again:)



########################################################################

"Jesús Gabriel y Galán" <jgabrielygalan@gmail.com> wrote in post
#988096:
> On Fri, Mar 18, 2011 at 7:06 AM, Shangz B. <shangbaby@gmail.com> wrote:
>>
>> reference to 'select_app,' or 'file_type,' 'file_name,' 'app_map...'
>> Thanks in advance, you've been lovely :)
>>
>>  end
>>  end
>> help
>> l.run( target )
>> end
>>
>>
>> #####################################################
>>
>> Attachments:
>> http://www.ruby-forum.com/attachment/6039/RubyForum.txt
>
> I see some strange things:
>
> First of all: initialize, run, select_launcher and file_type
> definitions should be inside class Launcher ... end, because they
> should be instance methods of class Launcher.
> You can remove the launcher = Launcher.new, since you are not using it.
> After that, I think the application should work, if you call it like:
>
> ruby launcher.rb test.html
>
> it should launch firefox with test.html as a parameter. Also, the
> parameter name launcher in the methods run and select_launcher is
> confusing, since you are not passing the launcher, but the target. So,
> this is how it would look like (I change other minor things):
>
> #!/usr/bin/env ruby
>
> class Launcher
>   def initialize(launcher_map)
>     @app_map = launcher_map
>   end
>
>   # Execute the given file using the associate app
>   def run(file)
>     application = select_launcher(file)
>     system ("#{application} #{file}")
>   end
>
>   # Given a file, look up the matching application
>   def select_launcher(file)
>     ftype = file_type(file)
>     @app_map [ftype]
>   end
>
>   # Return the part of the file name string after the last '.'
>   def file_type(file)
>     File.extname(file)[1..-1].downcase
>   end
> end
>
> def help
>   puts "You must pass in the path to the file to launch."
>   puts
>   puts "Usage: #{__FILE__} target_file"
> end
>
> if ARGV.empty?
>   help
>   exit
> end
>
> app_map= {'html' => 'firefox', 'rb' => 'notepad', 'jpg' => 'gimp'}
> l = Launcher.new( app_map)
> target = ARGV.join( ' ' )
> l.run( target )
>
> Jesus.

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