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Edit file: /usr/share/bash-completion/helpers/perl

# -*- perl -*-

use strict;
use Config;
use Cwd;
use File::Spec::Functions;

my %seen;

sub print_modules_real {
    my ($base, $dir, $word, $include_pod) = @_;

# return immediately if potential completion doesn't match current word
    # a double comparison is used to avoid dealing with string lengths
    # (the shorter being the pattern to be used as the regexp)
    # word 'Fi', base 'File' -> match 'File' against 'Fi'
    # word 'File::Sp', base 'File' -> match 'File::Sp' against 'File'
    return
           if $base
        && $word
        && $base !~ /^\Q$word/
        && $word !~ /^\Q$base/;

chdir($dir) or return;

# print each file
    foreach my $file (sort(glob('*.pm'), glob('*.pod'))) {
        next if ($file =~ /\.pod$/ and not $include_pod);
        $file =~ s/\.(?:pm|pod)$//;
        my $module = $base . $file;
        next if $module !~ /^\Q$word/;
        next if $seen{$module}++;
        print $module, "\n";
    }

# recurse in each subdirectory
    foreach my $directory (grep {-d} glob('*')) {
        my $subdir = $dir . '/' . $directory;
        if ($directory =~ /^(?:[.\d]+|$Config{archname}|auto)$/) {

# exclude subdirectory name from base
            print_modules_real(undef, $subdir, $word, $include_pod);
        } else {

# add subdirectory name to base
            print_modules_real($base . $directory . '::',
                $subdir, $word, $include_pod);
        }
    }
}

sub print_modules {
    my ($word, $include_pod) = @_;

my $origdir = getcwd;
    foreach my $directory (@INC) {
        print_modules_real(undef, $directory, $word, $include_pod);
        chdir $origdir;
    }
}

sub print_functions {
    my ($word) = @_;

my $perlfunc;
    for (@INC, undef) {
        return if not defined;
        $perlfunc = catfile $_, qw( pod perlfunc.pod );
        last if -r $perlfunc;
    }

open my $fh, '<', $perlfunc or return;

my $nest_level = -1;
    while (<$fh>) {
        next if 1 .. /^=head2 Alphabetical Listing of Perl Functions$/;
        ++$nest_level if /^=over/;
        --$nest_level if /^=back/;
        next          if $nest_level;
        next unless /^=item (-?\w+)/;
        my $function = $1;
        next if $function !~ /^\Q$word/;
        next if $seen{$function}++;
        print $function, "\n";
    }

}

my $type = shift;
my $word = shift;

if ($type eq 'functions') {
    print_functions($word);
} elsif ($type eq 'modules') {
    print_modules($word);
} elsif ($type eq 'perldocs') {
    print_modules($word, 1);
}

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