#!/usr/local/bin/perl

use strict;
use File::Find;
use File::Path;
use Getopt::Long;
use HTML::Stream;
use IO::File;
use Pod::Tree::HTML;
use File::Spec;

my %Options = (bgcolor => '#ffffff',
	       text    => '#000000',
	       hr      => 1,
	       toc     => 1 );

my $ok = GetOptions(\%Options, "base:s", 
		               "css:s",
		               "bgcolor:s",
		    	       "empty",
		               "index:s",
		               "module",
		               "text:s",
		               "toc!", 
		               "hr:i",
		               "variables:s");
$ok or die "Bad command line options\n";

my %Index;
my @Dirs;
my($PodDir, $HTMLDir, $Template, @Variables) = @ARGV;
$HTMLDir or die "pods2html PodDir HTMLDir\n";

$PodDir  = canonpath File::Spec $PodDir;
$HTMLDir = rel2abs   File::Spec $HTMLDir;

mkpath($HTMLDir);

do $Options{variables} if $Options{variables};

for (@Variables)
{
    chomp;
    my($name, $value) = split /=/, $_, 2;
    $name =~ s(^\$)();
    ${$Pod::Tree::HTML::{$name}} = $value;
}

umask 0022;
find({ wanted   => \&Translate,
       no_chdir => 1          }, $PodDir);
Index  () if $Options{index};
Cleanup() unless $Options{empty};


sub Translate
{
    -d and &Translate_Dir;
    -f and &Translate_POD;
}

sub MkDir
{
    my $dir = shift;

    -d $dir and return;
    mkdir $dir, 0755 or die "Can't mkdir $dir: $!\n";
    push @Dirs, $dir;
}

sub Translate_Dir
{
    my $dir = $File::Find::name;

    if ($HTMLDir eq rel2abs File::Spec $dir)
    {
	$File::Find::prune = 1;
	return;
    }

    if ($Options{module} and ( m(/t$) or m(/blib$) ) )
    {
	$File::Find::prune = 1;
	return;
    }

    $dir =~ s/^$PodDir/$HTMLDir/o;
    -d $dir or MkDir $dir;
    print "$File::Find::name\n";
}


sub Translate_POD
{
    m( \.(pm|pod)$ )x or return;
    my $source = $File::Find::name;

    Hidden($source) and return;
    print "$source\n";

    my $dest = $source;
    $dest =~ s/^$PodDir/$HTMLDir/;
    $dest =~ s( \.\w+$ )(.html)x;

    my $depth = Depth($source);

    my $pod = $source;
    $pod =~ s(^$PodDir/)();
    $pod =~ s( \.\w+$ )()x;
    $Index{$pod} = 1;

    my $html = new Pod::Tree::HTML $source, $dest, %Options;
    $html->set_options(depth => $depth);
    $html->translate($Template);
}

sub Hidden
{
    my $source = shift;
       $source =~ m(\.pm$) or return 0;
       $source =~ s(\.pm$)(.pod);
    -e $source
}

sub Depth
{
    my $source   = shift;
    my $tree     = new Pod::Tree;
       $tree->load_file($source);
    my $children = $tree->get_root->get_children;
    my @pod      = grep { is_pod $_ } @$children;
    my $node1    = $pod[1];
       $node1 or return '';

    my $text     = $node1->get_deep_text;
    my($name)    = split m(\s+-+\s+), $text;
       $name     =~ s(^\s+)();

    my @name     = split /::/, $name;
       @name-1
}

sub Index
{
    my $index   = "$HTMLDir/index.html";
    my $fh      = new IO::File ">$index";
    defined $fh or die "Can't open $index: $!\n";

    my $stream  = new HTML::Stream $fh;

    my $title   = $Options{index};
    my $bgcolor = $Options{bgcolor};
    my $text 	= $Options{text};

    $stream-> HTML->HEAD;
    $stream-> TITLE->text($title)->_TITLE;
    $stream->_HEAD
	   -> BODY(BGCOLOR => $bgcolor, TEXT => $text);
    $stream->H1->t($title)->_H1;

    Emit_Entries($stream);

    $stream->_BODY->_HTML;
}


sub Emit_Entries
{
    my $stream = shift;

    $stream->UL;

    for my $entry (sort keys %Index)
    {
	$stream->LI
	       ->A(HREF => "$entry.html")
	       ->t($entry)
	       ->_A
	       ->_LI;
    }

    $stream->_UL;
}

sub Cleanup
{
    while (@Dirs)
    {
	my $dir = pop @Dirs;
	rmdir $dir;  # does nothing unless $dir is empty
    }
}

__END__

=head1 NAME

pods2html - translate a tree of PODs to HTML


=head1 SYNOPSIS

C<pods2html>
[C<--base> I<url>]
[C<--css> I<url>]
[C<--empty>]
[C<--index> I<title>]
[C<--module>]
[C<-->[C<no>]C<toc>] [C<--hr> I<level>] 
[C<--bgcolor> I<#rrggbb>] [C<--text> I<#rrggbb>]
[C<--variables> I<values.pl>]
I<PODdir> I<HTMLdir> [F<template> [I<variable>=I<value> ...]]


=head1 DESCRIPTION

C<pods2html> finds all the F<.pod> and F<.pm> files in the 
directory tree rooted at I<PODdir>.
It translates each POD to HTML,
and writes it to a parallel directory tree rooted at I<HTMLdir>

It makes the HTML files world-readable.

If a F<template> file is provided,
then F<template> will be filled in by the C<Text::Template> module and written to F<dest>.
Here is a minimal template, showing all the variables that are set by C<pods2html>.

  <html>
   <head>
    <base href="{$base}">
    <link href="{$css}" rel="stylesheet" type="text/css">
    <title>{$title}</title>
   </head>
   <body bgcolor="{$bgcolor}" text="{$text}">
    {$toc}
    {$body}
   </body>
  </html>

If the C<--variables> option is provided, then the file I<values.pl> will be executed with a C<do>
call before the template is filled in. I<values.pl> may contain arbitrary Perl code.
The program fragments in the template are evaulted in the C<Pod::Tree::HTML> package.
Any variables that I<values.pl> sets in this package will be available to the template.

Additional scalar variables may be set on the command line with the I<variable>=I<value> syntax.
Variables set on the command line override variables set in I<values.pl>.

=head1 OPTIONS

=over 4

=item C<--base> I<url>

Specifies a base URL for HTML links.


=item C<--css> I<url>

Specifies a Cascanding Style Sheet for the generated HTML pages.


=item C<--empty>

Creates HTML files for empty PODs.
If this options is not provided, then no HTML file is created for empty PODs.


=item C<--index> I<title>

Writes an index of all the HTML files to I<HTMLDir>F</index.html>.
I<title> is used as the title of the index page.


=item C<--module>

Ignores files in directories named F<t/> and F<blib/>.
Useful for translating PODs in a module development directory.


=item C<-->[C<no>]C<toc>

Includes or omits the table of contents.
Default is to include the TOC.


=item C<--hr> I<level>

Controls the profusion of horizontal lines in the output, as follows:

    level   horizontal lines
    0 	    none
    1 	    between TOC and body
    2 	    after each =head1
    3 	    after each =head1 and =head2

Default is level 1.


=item C<--bgcolor> I<#rrggbb>

Set the background color to I<#rrggbb>.
Default is white.


=item C<--text> I<#rrggbb>

Set the text color to I<#rrggbb>.
Default is black.

=back


=head1 REQUIRES

L<C<Pod::Tree::HTML>>,
L<C<HTML::Stream>>


=head1 BUGS

The recursion check doesn't work on Win32.
This means that the program will enter an infinite recursion
if I<HTMLdir> is a subdirectory of I<PODdir>.


=head1 SEE ALSO

L<C<pod2html>>,
L<C<Pod::Tree::HTML>>


=head1 AUTHOR

Steven McDougall, <swmcd@world.std.com>


=head1 COPYRIGHT

Copyright (c) 1999-2006 by Steven McDougall.  This program is free software;
you can redistribute it and/or modify it under the same terms as Perl.