#!/usr/bin/env perl
use strict;

# This script will recombine the perltidy binary script and all of its modules
# into a single, monolithic script.  I use it for making a temporary "sandbox"
# for debugging.

# This is also useful for making a copy of previous versions for parallel
# debugging sessions.

# usage:
#   perl pm2pl

# Run this from the perltidy main installation directory.  It reads
# bin/perltidy and lib/*.pm and writes a file 'perltidy-VERSION.pl' in the
# current directory.

# This should work for a system with File::Spec,
# and for older Windows/Unix systems without File::Spec.
my $script  = 'bin/perltidy';
my @modules = qw(
  lib/Perl/Tidy.pm
  lib/Perl/Tidy/Debugger.pm
  lib/Perl/Tidy/DevNull.pm
  lib/Perl/Tidy/Diagnostics.pm
  lib/Perl/Tidy/FileWriter.pm
  lib/Perl/Tidy/Formatter.pm
  lib/Perl/Tidy/HtmlWriter.pm
  lib/Perl/Tidy/IOScalar.pm
  lib/Perl/Tidy/IOScalarArray.pm
  lib/Perl/Tidy/IndentationItem.pm
  lib/Perl/Tidy/LineBuffer.pm
  lib/Perl/Tidy/LineSink.pm
  lib/Perl/Tidy/LineSource.pm
  lib/Perl/Tidy/Logger.pm
  lib/Perl/Tidy/Tokenizer.pm
  lib/Perl/Tidy/VerticalAligner.pm
  lib/Perl/Tidy/VerticalAligner/Alignment.pm
  lib/Perl/Tidy/VerticalAligner/Line.pm
);

# try to make the pathnames system independent
eval "use File::Spec;";
my $missing_file_spec = $@;
unless ($missing_file_spec) {
    $script = File::Spec->catfile( split '/', $script );
    foreach my $module (@modules) {
        $module = File::Spec->catfile( split '/', $module );
    }
}

my $VERSION = get_version("lib/Perl/Tidy.pm");
my $outfile = "perltidy-$VERSION.pl";
open OUTFILE, "> $outfile" or die "can't open file '$outfile' : $!\n";
print "Creating standalone formatter script '$outfile' ....\n ";

# first, open the script and copy the first (hash-bang) line
# (Note: forward slashes in file names here will work in Windows)
open SCRIPT, "< $script" or die "can't open script file '$script' : $!\n";
my $hash_bang = <SCRIPT>;
print OUTFILE $hash_bang;

# then copy all modules
foreach my $module (@modules) {
    open PM, "< $module" or die "can't open my module file '$module' : $!\n";
    while (<PM>) {
        last if /^\s*__END__\s*$/;
        print OUTFILE unless $_ =~ /^use Perl::Tidy/;
    }
    close PM;
}

# then, copy the rest of the script except for the 'use PerlTidy' statement
while (<SCRIPT>) {
    last if /^\s*__END__\s*$/;
    print OUTFILE unless $_ =~ /^use Perl::Tidy/;
}
close SCRIPT;
close OUTFILE;
chmod 0755, $outfile;

my $testfile = "somefile.pl";
print <<EOM;

You can now run $outfile to reformat perl scripts.  
For example, the following command:

    perl $outfile $testfile

will produce the output file $testfile.tdy
EOM

sub get_version {
    my ($file) = @_;
    my $fh;
    open( $fh, "<", $file ) || die "cannot open $fh: $!\n";
    while ( my $line = <$fh> ) {

        # Looking for something simple like this, with or without quotes,
        # with semicolon and no sidecomments:
        #                     $VERSION   =   "20180202.245"  ;
        #                 our $VERSION   =    20104202       ;
        if ( $line =~
            /^((our)?\s*\$VERSION\s*=\s*\'?)  ([^'#]+)   (\'?) \s* ;/x )
        {
            $VERSION = $3;
            last;
        }
    }
    return $VERSION;
}