From: Brian Wallace <draygen80@...>
Date: 2009-04-22T03:11:34+09:00
Subject: Re: directory watcher, trying to match filename to directory name.

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Hi Tim,

 Thanks for the reply, since your the developer of the gem it is really nice
that you've taken the time to respond to my issue. You've made one of my
_favorite_ ruby gems so far...

Your example helps me a LOT  , especially since I'm horrible at regular
expressions :) .. I needed to show the application this morning, so I
frantically wrote an alternative - which may be ugly, but works pretty well
so far.. Basically, I grab all of the subdirectories of the Directory
Watcher directory, and then create an array of glob patterns with the
directory names, and filename ie:

@dir = Dir.open(@dirwatch)
parsed_dir = @dir.entries.grep(/^[^.]/).map
parsed_glob = parsed_dir.collect {|d| d = "*#{d}/#{d}*"}

I then just pass the parsed_glob array to the directory watcher ...

With that said - and since I am so horrible with regular expressions ...
Does anyone know the RegExp that will match directory names ONLY ?
(excluding '.' and '..') The one I have above appears to match anything
except '.' , and '..'

 Thanks,

Brian

On Tue, Apr 21, 2009 at 11:35 AM, Tim Pease <tim.pease@gmail.com> wrote:

> On Tue, Apr 21, 2009 at 6:51 AM, Brian Wallace <draygen80@gmail.com>
> wrote:
> > Thanks David,
> >
> >  Yes I've read every bit of documentation for Directory Watcher ... I
> guess
> > my problem is more of a generic ruby programming problem.
> >
> > I'm not sure how to dynamically change the glob pattern ...Since its set
> > during the creation of the dw object .. Of course I can change it, within
> > the add_observer block - with a symbol.. But the problem I'm having is
> > getting the subdirectory name for matching...
> >
> > ie: C:\Send has 3 subdirectories
> >
> > C:\Send\Bob
> > C:\Send\Kevin
> > C:\Send\James
> >
> > I want to only match a filename that has "Bob, Kevin, or James" inside
> its
> > respective subdirectory.
> >
>
> DirectoryWatcher is not able to do what you need. It only supports
> glob patterns for matching files, and what you are in need of is
> regular expressions. The best solution is to implement the regular
> expression matching inside your observer.
>
> def observer_method( *args )
>  args.each do |event|
>    next unless event.type == :added
>    next unless event.path =~ %r/^#{@directory}\/([^\/]+)\/.*\1.*/
>    # put your code here
>  end
> end
>
> Also, you have a sleep method in your observer block. I would
> recommend using the "stable" event if you want to make sure that the
> file is no longer being modified before operating on it.
>
> Blessings,
> TwP
>
>

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