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#!/usr/bin/perl
    eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
        if $running_under_some_shell;

=head1 NAME

pl2pm - Rough tool to translate Perl4 .pl files to Perl5 .pm modules.

=head1 SYNOPSIS

B<pl2pm> F<files>

=head1 DESCRIPTION

B<pl2pm> is a tool to aid in the conversion of Perl4-style .pl
library files to Perl5-style library modules.  Usually, your old .pl
file will still work fine and you should only use this tool if you
plan to update your library to use some of the newer Perl 5 features,
such as AutoLoading.

=head1 LIMITATIONS

It's just a first step, but it's usually a good first step.

=head1 AUTHOR

Larry Wall <larry@wall.org>

=cut

use strict;
use warnings;

my %keyword = ();

while (<DATA>) {
    chomp;
    $keyword{$_} = 1;
}

local $/;

while (<>) {
    my $newname = $ARGV;
    $newname =~ s/\.pl$/.pm/ || next;
    $newname =~ s#(.*/)?(\w+)#$1\u$2#;
    if (-f $newname) {
        warn "Won't overwrite existing $newname\n";
        next;
    }
    my $oldpack = $2;
    my $newpack = "\u$2";
    my @export = ();

    s/\bstd(in|out|err)\b/\U$&/g;
    s/(sub\s+)(\w+)(\s*\{[ \t]*\n)\s*package\s+$oldpack\s*;[ \t]*\n+/${1}main'$2$3/ig;
    if (/sub\s+\w+'/) {
        @export = m/sub\s+\w+'(\w+)/g;
        s/(sub\s+)main'(\w+)/$1$2/g;
    }
    else {
        @export = m/sub\s+([A-Za-z]\w*)/g;
    }
    my @export_ok = grep($keyword{$_}, @export);
    @export = grep(!$keyword{$_}, @export);

    my %export = ();
    @export{@export} = (1) x @export;

    s/(^\s*);#/$1#/g;
    s/(#.*)require ['"]$oldpack\.pl['"]/$1use $newpack/;
    s/(package\s*)($oldpack)\s*;[ \t]*\n+//ig;
    s/([\$\@%&*])'(\w+)/&xlate($1,"",$2,$newpack,$oldpack,\%export)/eg;
    s/([\$\@%&*]?)(\w+)'(\w+)/&xlate($1,$2,$3,$newpack,$oldpack,\%export)/eg;
    if (!/\$\[\s*\)?\s*=\s*[^0\s]/) {
        s/^\s*(local\s*\()?\s*\$\[\s*\)?\s*=\s*0\s*;[ \t]*\n//g;
        s/\$\[\s*\+\s*//g;
        s/\s*\+\s*\$\[//g;
        s/\$\[/0/g;
    }
    s/open\s+(\w+)/open($1)/g;
 
    my $export_ok = '';
    my $carp      ='';


    if (s/\bdie\b/croak/g) {
        $carp = "use Carp;\n";
        s/croak "([^"]*)\\n"/croak "$1"/g;
    }

    if (@export_ok) {
        $export_ok = "\@EXPORT_OK = qw(@export_ok);\n";
    }

    if ( open(PM, ">$newname") ) {
        print PM <<"END";
package $newpack;
use 5.006;
require Exporter;
$carp
\@ISA = qw(Exporter);
\@EXPORT = qw(@export);
$export_ok
$_
END
    }
    else {
      warn "Can't create $newname: $!\n";
    }
}

sub xlate {
    my ($prefix, $pack, $ident,$newpack,$oldpack,$export) = @_;

    my $xlated ;
    if ($prefix eq '' && $ident =~ /^(t|s|m|d|ing|ll|ed|ve|re)$/) {
        $xlated = "${pack}'$ident";
    }
    elsif ($pack eq '' || $pack eq 'main') {
        if ($export->{$ident}) {
            $xlated = "$prefix$ident";
        }
        else {
            $xlated = "$prefix${pack}::$ident";
        }
    }
    elsif ($pack eq $oldpack) {
        $xlated = "$prefix${newpack}::$ident";
    }
    else {
        $xlated = "$prefix${pack}::$ident";
    }

    return $xlated;
}
__END__
AUTOLOAD
BEGIN
CORE
DESTROY
END
INIT
CHECK
abs
accept
alarm
and
atan2
bind
binmode
bless
caller
chdir
chmod
chomp
chop
chown
chr
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close
closedir
cmp
connect
continue
cos
crypt
dbmclose
dbmopen
defined
delete
die
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each
else
elsif
endgrent
endhostent
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endpwent
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eof
eq
eval
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exists
exit
exp
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flock
for
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fork
format
formline
ge
getc
getgrent
getgrgid
getgrnam
gethostbyaddr
gethostbyname
gethostent
getlogin
getnetbyaddr
getnetbyname
getnetent
getpeername
getpgrp
getppid
getpriority
getprotobyname
getprotobynumber
getprotoent
getpwent
getpwnam
getpwuid
getservbyname
getservbyport
getservent
getsockname
getsockopt
glob
gmtime
goto
grep
gt
hex
if
index
int
ioctl
join
keys
kill
last
lc
lcfirst
le
length
link
listen
local
localtime
lock
log
lstat
lt
m
map
mkdir
msgctl
msgget
msgrcv
msgsnd
my
ne
next
no
not
oct
open
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or
ord
our
pack
package
pipe
pop
pos
print
printf
prototype
push
q
qq
qr
quotemeta
qw
qx
rand
read
readdir
readline
readlink
readpipe
recv
redo
ref
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require
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return
reverse
rewinddir
rindex
rmdir
s
scalar
seek
seekdir
select
semctl
semget
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send
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sethostent
setnetent
setpgrp
setpriority
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setsockopt
shift
shmctl
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sin
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socketpair
sort
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sqrt
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sysopen
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tell
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tie
tied
time
times
tr
truncate
uc
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umask
undef
unless
unlink
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unshift
untie
until
use
utime
values
vec
wait
waitpid
wantarray
warn
while
write
x
xor
y