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perlfind -- perldoc on steroids

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#!/usr/bin/env perl
 
use strict;
use warnings;
use Carp qw(cluck);
 
use autodie ':all';
use Getopt::Long 2.33 qw(:config auto_help);
use File::Find::Rule;
use File::Basename 'basename';
use Term::ProgressBar;
 
$0 = basename($0);
my $perldoc = $ENV{PERLDOC} || 'perldoc';
 
GetOptions(
verbose => \my $VERBOSE,
'perldoc=s' => \$perldoc,
'all' => \my $all,
) or die;
 
my $term = shift @ARGV || 'strict';
 
if ( my $doc = get_main_doc( $perldoc, $term ) ) {
exec $perldoc, $doc;
}
elsif ( is_func( $perldoc, $term ) ) {
exec $perldoc, '-f', $term;
}
elsif ( is_var( $perldoc, $term ) ) {
exec $perldoc, '-v', $term;
}
elsif ( is_faq( $perldoc, $term ) ) {
exec $perldoc, '-q', $term;
}
elsif ( my @files_with_count = do_grep( $all, $term ) ) {
foreach my $aref (@files_with_count) {
my ( $file, $count ) = @$aref;
print "$count hits: $file\n";
}
}
else {
warn "Could not find '$term'";
unless ($all) {
warn "You can try a brute force search with: $0 --all $term\n";
}
}
 
exit;
 
sub get_main_doc {
my ( $perldoc, $term ) = @_;
my @results = _exec( $perldoc, '-l', $term );
if ( @results > 1 ) {
my $results = join "\n" => @results;
cluck "Found more than one result for: $term\n\n$results\n";
}
return $results[0];
}
 
sub is_func {
my ( $perldoc, $term ) = @_;
my $is_func = _exec( $perldoc, '-f', $term );
return $is_func;
}
 
sub is_var {
my ( $perldoc, $term ) = @_;
my $is_var = _exec( $perldoc, '-v', "'$term'" );
return $is_var;
}
 
sub is_faq {
my ( $perldoc, $term ) = @_;
my $is_faq = _exec( $perldoc, '-q', "'$term'" );
return $is_faq;
}
 
sub do_grep {
my ( $all, $term ) = @_;
return unless $all;
 
warn "Could not find '$term'. Falling back to brute force search.";
 
my @paths = @INC, map { split /:/ } $ENV{PERL5LIB};
if ( $VERBOSE ) {
my $locations = join "\n\t" => "Searching in:", @paths;
warn "$locations\n";
}
my @files = File::Find::Rule->file->name('*.pod')->in(@paths);
my $count = @files;
if ( $VERBOSE ) {
warn "Found $count matching files\n";
}
 
my @files_with_count;
my $progress = Term::ProgressBar->new({count => scalar @files});
my $num_searched = 0;
foreach my $file (@files) {
my @count = _exec( 'grep', '-c', $term, $file );
$num_searched++;
if ( $count[0] ) {
push @files_with_count => [ $file, $count[0] ];
}
$progress->update($num_searched);
}
@files_with_count = sort { $b->[1] <=> $a->[1] } @files_with_count;
return @files_with_count;
}
 
sub _exec {
my @command = @_;
if ($VERBOSE) {
warn "Executing: @command\n";
}
chomp( my @results = qx(@command 2>/dev/null) );
return @results;
}
 
__END__
 
=head1 NAME
perlfind - perldoc on steroids
=head1 SYNOPSIS
perlfind '$@'
perlfind Scalar::Util
perlfind file
perlfind die
perlfind __DATA__ --all
=head1 DESCRIPTION
Tired of C<perldoc>? Try C<perlfind> I<anything>. It will return the first
matching perldoc document found for I<anything>, in the following precedence
order.
=over 4
=item 1. C<perldoc MODULE>
=item 2. C<perldoc -f FUNCTION>
=item 3. C<perldoc -v VARIABLE>
=item 4. C<perldoc -q FAQKEYWORD>
=item 5. A brute force grep of C<@INC> and C<$ENV{PERL5LIB>.
=back
Note that the brute force grep requires L</Term::ProgressBar> and
L</File::Find::Rule>. You must also specify the C<--all> option.
=head1 OPTIONS
--perldoc=/path/to/perldoc Force an explicit path to your perldoc
--verbose Show how we're searching
--all Fall back to brute force if we fail
=head1 CAVEATS
It's a hack.
=head1 BUGS
Probably.
=head1 AUTHOR
Curtis "Ovid" Poe
=head1 LICENSE
Copyright (c) 2012 Curtis "Ovid" Poe (ovid@cpan.org). All rights reserved.
This module is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

I made a minor change in my fork. perl unshifts PERL5LIB onto @INC; the original do_grep() was treating PERL5LIB as though it were pushed onto @INC.

Actually, checking PERL5LIB in addition to @INC seems redundant. If $ENV{PERL5LIB} is set, it's already at the beginning of @INC. Adding it on to @INC, whether at the beginning or the end, just means that those directories will get checked twice. I've updated my gist.

gray commented

If you use it from within vim, you might want it add namespace backtracking, like my hack: p5doc.

perlfind --all '$@'

a bug?

Owner
Ovid commented

vfilatov: the --all switch only falls back to the in-depth search if it doesn't find the argument in the normal docs. So I would argue that it's another feature I should add :)

You mean you don't get the script frozen?

% perlfind --all '$@'
Could not find '$@'. Falling back to brute force search. at /usr/local/bin/perlfind line 83.
0% [ ]^C

Owner
Ovid commented

Nope, it doesn't freeze for me. What version of Perl are you using?

Owner
Ovid commented

Actually, it sometimes freezes for me. This is very strange!

Owner
Ovid commented

I don't have the time to debug this right now, but it looks like File::Find::Rule is hanging.

Owner
Ovid commented

I've just updated the gist above. Grab the new copy and run it with --verbose.

./gistfile1.pl --verbose --all '$@'
Executing: perldoc -l $@
Executing: perldoc -f $@
Executing: perldoc -v '$@'
Executing: perldoc -q '$@'
Could not find '$@'. Falling back to brute force search. at ./gistfile1.pl line 83.
Use of uninitialized value $_ in split at ./gistfile1.pl line 85.
Searching in:
/etc/perl
/usr/local/lib/perl/5.10.1
/usr/local/share/perl/5.10.1
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.10
/usr/share/perl/5.10
/usr/local/lib/site_perl
.
Found 282 matching files
0% [ ]Executing: grep -c $@ /usr/local/lib/perl/5.10.1/perllocal.pod
^C

looks like 'grep' does not get a pattern to search

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