squash

#!perl

# Squashes together the parts of ack into the single ack app.
use warnings;
use strict;

use File::Next;

# make clear that ack is not supposed to be edited
my $NO_EDIT_COMMENT = <<'EOCOMMENT';
#
# This file, ack, is generated code.
# Please DO NOT EDIT or send patches for it.
#
# Please take a look at the source from
# http://github.com/petdance/ack2
# and submit patches against the individual files
# that build ack.
#
EOCOMMENT

my $debug_mode = grep { $_ eq '--debug' } @ARGV;
@ARGV          = grep { $_ ne '--debug' } @ARGV;

my $code;
for my $arg ( @ARGV ) {
    my $filename = $arg;
    if ( $arg =~ /::/ ) {
        my $key = "$arg.pm";
        $key =~ s{::}{/}g;
        $filename = $INC{$key} or die "Can't find the file for $arg";
    }

    warn "Reading $filename\n";
    open( my $fh, '<', $filename ) or die "Can't open $filename: $!";
    my $was_in_pod = 0;
    my $in_pod     = 0;
    $code .= "#line 1 '$filename'\n" if $debug_mode && $filename ne 'ack';
    while ( <$fh> ) {
        next if /^use (?:File::Next|App::Ack)/;

        s/^use base (.+)/BEGIN {\n    our \@ISA = $1\n}/;

        if ( $was_in_pod && !$in_pod ) {
            $was_in_pod = 0;
            if ($debug_mode) {
                $code .= "#line $. '$filename'\n";
            }
        }

        # See if we're in module POD blocks
        if ( $filename ne 'ack' ) {
            $was_in_pod = $in_pod;

            if ( /^=(\w+)/ ) {
                $in_pod = ($1 ne 'cut');
                next;
            }
            elsif ( $in_pod ) {
                next;
            }
        }

        # Replace the shebang line and append 'no edit' comment
        if ( s{^#!.+}{#!/usr/bin/env perl} ) {
            $_ .= $NO_EDIT_COMMENT;
        }

        # Remove Perl::Critic comments.
        # I'd like to remove all comments, but this is a start
        s{\s*##.+critic.*}{};
        $code .= $_;
    }
    close $fh;
}

for my $unused_func ( qw( dirs everything ) ) {
    $code =~ s/^sub $unused_func\b.*?^}//sm; # It's OK if we can't find it
}
print $code;

exit 0;