simplify_static_dir/util/squash

#!/usr/bin/perl

# Squashes together the parts of the app into the single script.
# (Adapted from the script that squashes App::Ack - see https://github.com/beyondgrep/ack3)
use warnings;
use strict;

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 $in_pod = 0;
    my $in_section = '';
    my $ignore_lines = 0;
    my $empty_lines = 0;
    while (<$fh>) {
        if (/#.*:squash-ignore-start:$/) {
            $in_section = 'ignore';
            $ignore_lines = 1;
        } elsif (/#.*:squash-ignore-end:$/) {
            $in_section = '';
            $ignore_lines = 1;
        }
        if ($ignore_lines > 0) {
            $ignore_lines--;
            next;
        }

        if ($in_section eq 'ignore') {
            $empty_lines = 0 unless /^$/;
            $code .= $_;
            next;
        }

        # Remove repeated newlines between paragraphs
        # (Provided of course we're not in an 'ignore' section)
        if (/^$/) {
            ++$empty_lines;
            if ($empty_lines > 1) {
                next;
            }
        } else {
            $empty_lines = 0;
        }

        if (/#.*:squash-remove-start:$/) {
            $in_section = 'remove';
            next;
        } elsif (/#.*:squash-remove-end:$/) {
            $in_section = '';
            next;
        }
        next if $in_section eq 'remove';
        next if /#.*:squash-remove-line:$/;

        next if /^\s*1;$/;

        if ($filename =~ /\.pm$/) {
            # See if we're in module POD blocks
            if (/^=(\w+)/) {
                $in_pod = ($1 ne 'cut');
                next;
            }
            elsif ($in_pod) {
                next;
            }
            next if /^# vi:/;
        }

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

    # Warn if there were unterminated :squash-*: sections
    warn "$filename: Unterminated :squash-$in_section-start: section" if $in_section;

    close $fh;
}

print $code;

exit 0;