From: David Jacobs <david@...>
Date: 2012-09-01T13:23:05+09:00
Subject: Re: Parsing unix filenames from STDIN

Sorry for the delay. Thanks for the pointer to Shellwords and to iteration, guys! 

David 


On Monday, August 27, 2012 at 2:52 PM, Sean O'Halpin wrote:

> On Mon, Aug 27, 2012 at 10:51 AM, Robert Klemme
> <shortcutter@googlemail.com (mailto:shortcutter@googlemail.com)> wrote:
> > 
> > Two additional cents:
> > 
> > 1. I'd rather use $stdin instead of STDIN, see here for reasoning:
> > http://stackoverflow.com/questions/4279604/what-is-the-difference-between-stdin-and-stdin-in-ruby
> 
> 
> 
> Good point. I agree.
> 
> > 
> > 2. One can as well use the usual iteration for reading lines from files.
> > 
> > =>
> > 
> > require 'shellwords'
> > 
> > $stdin.each_line do |line|
> > filename = Shellwords.shellwords(line).join('')
> > p filename
> > # expand wildcards
> > p Dir[filename]
> > end
> > 
> > Advantage is also that the scope of "line" is limited to the block
> > reducing potential for errors.
> 
> 
> 
> Another good point.
> 
> > Btw, Sean, are you sure David will join all the shellwords?
> 
> No, I wrote my response after quickly reading his examples, not
> by reading carefully to the end of his post.
> 
> > I am
> > asking since he said there were commands as well and he basically
> > wants to parse in the same way the shell does. So:
> > 
> > irb(main):006:0> ['my\\ file.txt', '"my file.txt"', 'ls foo\\
> > bar.txt'].each {|s| printf "%p -> %p\n", s, Shellwords.shellwords(s)}
> > "my\\ file.txt" -> ["my file.txt"]
> > "\"my file.txt\"" -> ["my file.txt"]
> > "ls foo\\ bar.txt" -> ["ls", "foo bar.txt"]
> > => ["my\\ file.txt", "\"my file.txt\"", "ls foo\\ bar.txt"]
> 
> 
> 
> Hat trick! I agree with all your points :)
> 
> > 
> > Kind regards
> > 
> > robert
> > 
> > --
> > remember.guy do |as, often| as.you_can - without end
> 
> 
> 
> Indeed. All the best,
> Sean