From: "Brian Schröder" <ruby.brian@...>
Date: 2005-08-19T01:32:29+09:00
Subject: Re: Idiomatic ruby version of this code?

On 18/08/05, Brock Weaver <brockweaver@gmail.com> wrote:
> Showing off ruby to a coworker, and I want to emphasize how succinct yet
> clear it can be.  So I want to rename all .mp3 files to .temp, or vice versa
> in the current directory -- in the shortest LOC *that you would actually write*;
> not the "here's a one-liner nobody in their right mind would every write if
> they had to maintain it".
> 
> Here's my first solution:
> 
> Dir.new("./").each do |file|
>         if file.match(/mp3$/)
>                 File.rename(file, file.gsub(/mp3$/, 'temp'))
>         elsif file.match(/temp$/)
>                 File.rename(file, file.gsub(/temp$/, 'mp3'))
>         end
> end
> 
> Note you can NOT do the following, as it renames mp3 to temp,
> then immediately renames that same file back to mp3...
> 
> Dir.new("./").each do |file|
>         File.rename(file, file.gsub(/mp3$/, 'temp')) if file.match(/mp3$/)
>         File.rename(file, file.gsub(/temp$/, 'mp3')) if file.match(/temp$/)
> end
> 
> Any ideas?
> 
> --
> Brock Weaver
> [OBC]Technique
> 
> 

If it where a one time solution, I'd do something like this. Though
maybe I'd extract the file endings into variables, to make it easier
to change them.

mp3 = Dir['*.mp3']
temp = Dir['*.temp']
mp3.each do | fn | File.rename(fn, File.basename(fn, '.mp3') + '.temp') end
temp.each do | fn | File.rename(fn, File.basename(fn, '.temp') + '.mp3') end

regards,

Brian

-- 
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