WxResearcher has asked for the wisdom of the Perl Monks concerning the following question:

I am trying to parse this path but because it is a directory of subdirectories the last part of the path is variable. I want to assign the last directory in the path a variable so I can print it later on but I've had no luck. Any help is greatly appreciated. Thanks!

 #!/usr/bin/perl
                                                                      
+                          
#KDUX station METARS throughout a certain directory                   
+                          
                                                                      
+                          
use strict;                       
use warnings;                                
use File::Find;                      
use File::Basename;

my($filename, $directories, $suffix) = basename("/d2/aschwa/archive_pr
+oject/METAR_data/#lastdirectoryname");          

my @folder = ("/d2/aschwa/archive_project/METAR_data/");

open(OUT , '>',+ 'KDUX_METARS.txt') or die "Could not open $!";       
+                           
                                                                      
+print OUT "Station, Day/Time, Obs Type, Wind/Gust (Kt), Vis (SM), Sky
+, T/Td (C), Alt, Rmk\n";

print STDOUT "Finding METAR files\n";
                     
my $criteria = sub {if(-e && /^2012/) {
         open(my $file,$_) or die "Could not open $_ $!\n";
             while(<$file>) {
               print OUT $lastdirectoryname, $_ if /KDUX ....55Z|KDUX 
+....05Z/;      }                                                  }  
+                                                       };            
+                               
find($criteria,@folder);                                              
+                          
close OUT;

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Replies are listed 'Best First'.
Re: I humbly ask for your help with parsing
by atcroft (Abbot) on Oct 30, 2013 at 20:09 UTC

    I think File::Spec's catdir(), splitdir(), catpath(), and splitpath() functions may be what you are looking for. You may use splitpath() to break the name apart, splitdir() to break the directory into a list, push() the desired directory name onto the end, then catdir() to reassemble the directory path, then catpath() to build the full name.

    Hope that helps.

[reply]
      ++ atcroft -- File::Specdoes the job: 

      #!/usr/bin/perl

use strict;
use warnings;

use File::Spec;

{
    my $pathName = "/usr/tmp/booger/test.dat";
    my $baseName = ExtractLastDir($pathName);
    print "Result is $baseName\n";
}

exit;


sub ExtractLastDir
{
    my ($fullName, @extraStuff) = @_;
    if (!defined $fullName) { $fullName = ''; }

    my ($volumeName, $directoryPath, $fileName) = File::Spec->splitpat
+h($fullName);
    my @directoryNames = File::Spec->splitdir($directoryPath);

    # Grab the last element from the directory -- but it is probably b
+lank
    my $lastDirectory = pop @directoryNames;

    # So if it is blank, get the next one
    if ($lastDirectory eq '')
    {
        $lastDirectory = pop @directoryNames;
    }

    return $lastDirectory;
}

__END__

C:\Steve\Dev\PerlMonks\P-2013-10-30@1354-BaseDir>basedir3.pl
Result is booger

      [download]
[reply]
[d/l]
[select]
Re: I humbly ask for your help with parsing
by marinersk (Priest) on Oct 30, 2013 at 20:00 UTC

    I can't get your code to run, and I don't think it's because I'm on a Windows system (but I could be wrong): 

    C:\Steve\Dev\PerlMonks\P-2013-10-30@1354-BaseDir>basedir.pl
Global symbol "$lastdirectoryname" requires explicit package name at 
  C:\Steve\Dev\PerlMonks\P-2013-10-30@1354-BaseDir\basedir.pl line 22.
Execution of C:\Steve\Dev\PerlMonks\P-2013-10-30@1354-BaseDir\basedir.
+pl aborted due to compilation errors.

    [download]

    Are you trying to extract the last directory name out of a full pathname? Example:

    my $pathName = "/usr/tmp/booger/test.dat";
    my $baseName = ExtractLastDir($pathName);
    print "Result is $baseName\n";

    And you would expect:

    Result is booger

    Is that your goal?

[reply]
[d/l]
[select]

      That is exactly my goal. Sorry I wasn't very clear. There are a series of dated subdirectories (i.e. "20120405") underneath the directory "METAR_files" that are searched for a string and printed when that string is found. I just need to take the directory that the script is found in and print it with the script. The path name is: /d2/aschwa/archive_project/METAR_data/ and the subdirectories are "20110101","20110102","20110103", etc. I want to get the subdirectory name. Thank you so much for your help.

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Re: I humbly ask for your help with parsing
by Lennotoecom (Pilgrim) on Oct 30, 2013 at 23:46 UTC 
    $_ = '/usr/local/www/someth/file.cfg';
print "$1\n" if /.+\/(\w+)\//;

    [download]
    no?
[reply]
[d/l]
      The main benefit of matured modules is they handle corner cases you might have overlooked. Your code would, I agree, work most of the time, but if you get an odd directory name with a slash in it, she fails: 

      $_ = '/usr/local/www/"something/other"/"This file/data thing.cfg"';
print "$1\n" if /.+\/(\w+)\//;

www

      [download]
[reply]
[d/l]
        I agree, it's just,
        if the author's task is to thrash through some ordinary-named directories
        maybe he doesn't need all this module-stuff.
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Re: I humbly ask for your help with parsing (Path::Tiny/File::Find::Rule)
by Anonymous Monk on Oct 30, 2013 at 22:53 UTC

    #!/usr/bin/perl --
    use strict; use warnings;
    use Path::Tiny qw/ path /;
    use File::Find::Rule qw/ file /;
    my @files = find( -file => name => qr{\.pl$} => in => $thisdironly, maxdepth => 1 );
    my @dirs = find( -file => name => qr{metar} => in => \@startdirs );
    my $kduxout = path('KDUX_METARS.txt')->openrw_utf8;
    print $kduxout "$_\n" for @files, @dirs;
[reply]

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