Forum: Ruby directory watcher, trying to match filename to directory name.

Announcement (2017-05-07): www.ruby-forum.com is now read-only since I unfortunately do not have the time to support and maintain the forum any more. Please see rubyonrails.org/community and ruby-lang.org/en/community for other Rails- und Ruby-related community platforms.
3af9b1c30beee755b32c660d6687537a?d=identicon&s=25 Brian Wallace (Guest)
on 2009-04-21 07:04
(Received via mailing list)
Hi All,

 Here's an issue I can't seem to figure out, regardless of the hours
i've
spent pondering it...

I'm using Directory Watcher to scan a directory for added files, if
files
are added I run my method that handles them.. This works great...

However.. I'm trying to match the directory name to the file name , ie:

C:\Send\Bob\Bob* will trigger the event ,but any other file added to
that
directory will not ... here's what I have - this will just fire an event
for
any file added to the observed folder.

I set a directory , such as "C:\Send" and then only monitor the
subdirectories of this directory .. I just need to make sure that events
are
fired _only_ when the subdirectory name matches the beginning of the
file
name.

dw = DirectoryWatcher.new "#{@dirwatch}", :interval => 5, :glob =>
"*/*",
:pre_load => true
dw.add_observer {|*args| args.each do |a|
    if a.type == :added
      sleep(3)
      @filename = a.path
       signInAction()
        getFile(@filename)
      initDataUpload(@localFileSize, @session)
      completeSend(@fileId, @session)
       addDelivery(@localFile, @fileId, @session, @rcpt_email)
      puts "File: #{@filename} sent!!!"
      @chunkSize = 61440
    end
end
end}

Any Ideas?

 Thanks,

Brian
1d0479f64e06532c86e785a9e59efd23?d=identicon&s=25 David Gaya (Guest)
on 2009-04-21 09:30
(Received via mailing list)
> dw = DirectoryWatcher.new "#{@dirwatch}", :interval => 5, :glob => "*/*", :pre_load => 
true
dw = DirectoryWatcher.new "#{@dirwatch}", :interval => 5, :glob =>
"*/Bob*", :pre_load => true

From the documentation:
File Selection
The directory watcher uses glob patterns to select the files to scan.
The default glob pattern will select all regular files in the
directory of interest ’*’.
Here are a few useful glob examples:
    '*'               => all files in the current directory
    '**/*'            => all files in all subdirectories
    '**/*.rb'         => all ruby files
    'ext/**/*.{h,c}'  => all C source code files

Regards,
David

2009/4/21 Brian Wallace <draygen80@gmail.com>:
3af9b1c30beee755b32c660d6687537a?d=identicon&s=25 Brian Wallace (Guest)
on 2009-04-21 14:52
(Received via mailing list)
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.
4d5b5dd4e263d780a5dfe7ac8b8ac98c?d=identicon&s=25 Tim Pease (Guest)
on 2009-04-21 17:36
(Received via mailing list)
On Tue, Apr 21, 2009 at 6:51 AM, Brian Wallace <draygen80@gmail.com>
wrote:
> 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
3af9b1c30beee755b32c660d6687537a?d=identicon&s=25 Brian Wallace (Guest)
on 2009-04-21 20:12
(Received via mailing list)
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
Bee69cfed999cd13e3bff73d472a39ee?d=identicon&s=25 Hassan Schroeder (Guest)
on 2009-04-21 20:19
(Received via mailing list)
On Tue, Apr 21, 2009 at 11:11 AM, Brian Wallace <draygen80@gmail.com>
wrote:

> With that said - and since I am so horrible with regular expressions ...
> Does anyone know the RegExp that will match directory names ONLY ?

There's nothing about a name that distinguishes a directory from a
file, so the answer to that is easy:  no  :-)
3af9b1c30beee755b32c660d6687537a?d=identicon&s=25 Brian Wallace (Guest)
on 2009-04-21 20:29
(Received via mailing list)
I do realize this :) , but if I could at least assume that "STRING"
without
the .??? is a directory, it would suffice ... Since the application will
run
in Windows there's less of a chance that a file called "STRING" would be
placed into the list.

So a RegEx that matches anything up to the '.' file extension and
excludes
'.' and '..' would be enough

On Tue, Apr 21, 2009 at 2:19 PM, Hassan Schroeder <
Bee69cfed999cd13e3bff73d472a39ee?d=identicon&s=25 Hassan Schroeder (Guest)
on 2009-04-21 20:47
(Received via mailing list)
On Tue, Apr 21, 2009 at 11:28 AM, Brian Wallace <draygen80@gmail.com>
wrote:
> I do realize this :) , but if I could at least assume that "STRING" without
> the .??? is a directory, it would suffice ... Since the application will run
> in Windows there's less of a chance that a file called "STRING" would be
> placed into the list.

Still a dicey assumption, IMO, but

> So a RegEx that matches anything up to the '.' file extension and excludes
> '.' and '..' would be enough

Something like

irb(main):017:0> puts "wow" if /^[\w]+$/.match("foobar")
wow
=> nil
irb(main):018:0> puts "wow" if /^[\w]+$/.match("foo.bar")
=> nil
irb(main):019:0>

HTH!
4d5b5dd4e263d780a5dfe7ac8b8ac98c?d=identicon&s=25 Tim Pease (Guest)
on 2009-04-21 20:47
(Received via mailing list)
On Tue, Apr 21, 2009 at 12:28 PM, Brian Wallace <draygen80@gmail.com>
wrote:
> I do realize this :) , but if I could at least assume that "STRING" without
> the .??? is a directory, it would suffice ... Since the application will run
> in Windows there's less of a chance that a file called "STRING" would be
> placed into the list.
>
> So a RegEx that matches anything up to the '.' file extension and excludes
> '.' and '..' would be enough
>

No regular expression required ...

Dir.glob('/root/directory/*').each do |fn|
  next unless test(?d, fn)
  # your code goes here
end


The "test(?d, fn)" returns true if the current filename is a directory
and false otherwise.

Blessings,
TwP
3af9b1c30beee755b32c660d6687537a?d=identicon&s=25 Brian Wallace (Guest)
on 2009-04-21 20:59
(Received via mailing list)
I agree, not a good assumption in most cases - and its a bit wasteful
since
i'm creating an array of globs with elements that will never match (ie:
a
file with a single name in C:\send will never match unless a directory
exists with the same name, and the same file under it)

This is good though, thank you - just seeing these regex's in use helps
me
understand them..

 Thanks,

Brian

On Tue, Apr 21, 2009 at 2:46 PM, Hassan Schroeder <
3af9b1c30beee755b32c660d6687537a?d=identicon&s=25 Brian Wallace (Guest)
on 2009-04-21 21:13
(Received via mailing list)
Tim,

 This was my original idea, however this returns the full pathname -
when I
only need actual directory name to be able to form the array of glob
patterns..

If I could figure out how this would return just the children directory
names of ('/root/directory'), this would be the perfect solution.

Thanks again for all your attention, I've already learned so much.

 Brian
Ae16cb4f6d78e485b04ce1e821592ae5?d=identicon&s=25 Martin DeMello (Guest)
on 2009-04-21 22:37
(Received via mailing list)
On Wed, Apr 22, 2009 at 12:42 AM, Brian Wallace <draygen80@gmail.com>
wrote:
> Tim,
>
>  This was my original idea, however this returns the full pathname - when I
> only need actual directory name to be able to form the array of glob
> patterns..
>
> If I could figure out how this would return just the children directory
> names of ('/root/directory'), this would be the perfect solution.

Look up File.basename and File.dirname

martin
This topic is locked and can not be replied to.