html.pm

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package Pod::Html;
use strict;
require Exporter;

use vars qw($VERSION @ISA @EXPORT @EXPORT_OK);
$VERSION = 1.08;
@ISA = qw(Exporter);
@EXPORT = qw(pod2html htmlify);
@EXPORT_OK = qw(anchorify);

use Carp;
use Config;
use Cwd;
use File::Spec;
use File::Spec::Unix;
use Getopt::Long;

use locale;	# make \w work right in non-ASCII lands

=head1 NAME

Pod::Html - module to convert pod files to HTML

=head1 SYNOPSIS

    use Pod::Html;
    pod2html([options]);

=head1 DESCRIPTION

Converts files from pod format (see L<perlpod>) to HTML format.  It
can automatically generate indexes and cross-references, and it keeps
a cache of things it knows how to cross-reference.

=head1 FUNCTIONS

=head2 pod2html

    pod2html("pod2html",
             "--podpath=lib:ext:pod:vms",
             "--podroot=/usr/src/perl",
             "--htmlroot=/perl/nmanual",
             "--libpods=perlfunc:perlguts:perlvar:perlrun:perlop",
             "--recurse",
             "--infile=foo.pod",
             "--outfile=/perl/nmanual/foo.html");

pod2html takes the following arguments:

=over 4

=item backlink

    --backlink="Back to Top"

Adds "Back to Top" links in front of every C<head1> heading (except for
the first).  By default, no backlinks are generated.

=item cachedir

    --cachedir=name

Creates the item and directory caches in the given directory.

=item css

    --css=stylesheet

Specify the URL of a cascading style sheet.  Also disables all HTML/CSS
C<style> attributes that are output by default (to avoid conflicts).

=item flush

    --flush

Flushes the item and directory caches.

=item header

    --header
    --noheader

Creates header and footer blocks containing the text of the C<NAME>
section.  By default, no headers are generated.

=item help

    --help

Displays the usage message.

=item hiddendirs

    --hiddendirs
    --nohiddendirs

Include hidden directories in the search for POD's in podpath if recurse
is set.
The default is not to traverse any directory whose name begins with C<.>.
See L</"podpath"> and L</"recurse">.

[This option is for backward compatibility only.
It's hard to imagine that one would usefully create a module with a
name component beginning with C<.>.]

=item htmldir

    --htmldir=name

Sets the directory in which the resulting HTML file is placed.  This
is used to generate relative links to other files. Not passing this
causes all links to be absolute, since this is the value that tells
Pod::Html the root of the documentation tree.

=item htmlroot

    --htmlroot=name

Sets the base URL for the HTML files.  When cross-references are made,
the HTML root is prepended to the URL.

=item index

    --index
    --noindex

Generate an index at the top of the HTML file.  This is the default
behaviour.

=item infile

    --infile=name

Specify the pod file to convert.  Input is taken from STDIN if no
infile is specified.

=item libpods

    --libpods=name:...:name

List of page names (eg, "perlfunc") which contain linkable C<=item>s.

=item netscape

    --netscape
    --nonetscape

B<Deprecated>, has no effect. For backwards compatibility only.

=item outfile

    --outfile=name

Specify the HTML file to create.  Output goes to STDOUT if no outfile
is specified.

=item podpath

    --podpath=name:...:name

Specify which subdirectories of the podroot contain pod files whose
HTML converted forms can be linked to in cross references.

=item podroot

    --podroot=name

Specify the base directory for finding library pods.

=item quiet

    --quiet
    --noquiet

Don't display I<mostly harmless> warning messages.  These messages
will be displayed by default.  But this is not the same as C<verbose>
mode.

=item recurse

    --recurse
    --norecurse

Recurse into subdirectories specified in podpath (default behaviour).

=item title

    --title=title

Specify the title of the resulting HTML file.

=item verbose

    --verbose
    --noverbose

Display progress messages.  By default, they won't be displayed.

=back

=head2 htmlify

    htmlify($heading);

Converts a pod section specification to a suitable section specification
for HTML. Note that we keep spaces and special characters except 
C<", ?> (Netscape problem) and the hyphen (writer's problem...).

=head2 anchorify

    anchorify(@heading);

Similar to C<htmlify()>, but turns non-alphanumerics into underscores.  Note
that C<anchorify()> is not exported by default.

=head1 ENVIRONMENT

Uses C<$Config{pod2html}> to setup default options.

=head1 AUTHOR

Tom Christiansen, E<lt>[e-mail]<gt>.

=head1 SEE ALSO

L<perlpod>

=head1 COPYRIGHT

This program is distributed under the Artistic License.

=cut

my($Cachedir);
my($Dircache, $Itemcache);
my @Begin_Stack;
my @Libpods;
my($Htmlroot, $Htmldir, $Htmlfile, $Htmlfileurl);
my($Podfile, @Podpath, $Podroot);
my $Css;

my $Recurse;
my $Quiet;
my $HiddenDirs;
my $Verbose;
my $Doindex;

my $Backlink;
my($Listlevel, @Listend);
my $After_Lpar;
use vars qw($Ignore);  # need to localize it later.

my(%Items_Named, @Items_Seen);
my($Title, $Header);

my $Top;
my $Paragraph;

my %Sections;

# Caches
my %Pages = ();			# associative array used to find the location
				#   of pages referenced by L<> links.
my %Items = ();			# associative array used to find the location
				#   of =item directives referenced by C<> links

my %Local_Items;
my $Is83;

my $Curdir = File::Spec->curdir;

init_globals();

sub init_globals {
    $Cachedir = ".";		# The directory to which item and directory
				# caches will be written.

    $Dircache = "pod2htmd.tmp";
    $Itemcache = "pod2htmi.tmp";

    @Begin_Stack = ();		# begin/end stack

    @Libpods = ();	    	# files to search for links from C<> directives
    $Htmlroot = "/";	    	# http-server base directory from which all
				#   relative paths in $podpath stem.
    $Htmldir = "";	    	# The directory to which the html pages
				# will (eventually) be written.
    $Htmlfile = "";		# write to stdout by default
    $Htmlfileurl = "" ;		# The url that other files would use to
				# refer to this file.  This is only used
				# to make relative urls that point to
				# other files.

    $Podfile = "";		# read from stdin by default
    @Podpath = ();		# list of directories containing library pods.
    $Podroot = $Curdir;	        # filesystem base directory from which all
				#   relative paths in $podpath stem.
    $Css = '';                  # Cascading style sheet
    $Recurse = 1;		# recurse on subdirectories in $podpath.
    $Quiet = 0;		        # not quiet by default
    $Verbose = 0;		# not verbose by default
    $Doindex = 1;   	    	# non-zero if we should generate an index
    $Backlink = '';		# text for "back to top" links
    $Listlevel = 0;		# current list depth
    @Listend = ();		# the text to use to end the list.
    $After_Lpar = 0;            # set to true after a par in an =item
    $Ignore = 1;		# whether or not to format text.  we don't
				#   format text until we hit our first pod
				#   directive.

    @Items_Seen = ();	        # for multiples of the same item in perlfunc
    %Items_Named = ();
    $Header = 0;		# produce block header/footer
    $Title = '';		# title to give the pod(s)
    $Top = 1;			# true if we are at the top of the doc.  used
				#   to prevent the first <hr /> directive.
    $Paragraph = '';		# which paragraph we're processing (used
				#   for error messages)
    %Sections = ();		# sections within this page

    %Local_Items = ();
    $Is83 = $^O eq 'dos';       # Is it an 8.3 filesystem?
}

#
# clean_data: global clean-up of pod data
#
sub clean_data($){
    my( $dataref ) = @_;
    for my $i ( 0..$#{$dataref} ) {
	${$dataref}[$i] =~ s/\s+\Z//;

        # have a look for all-space lines
      if( ${$dataref}[$i] =~ /^\s+$/m and $dataref->[$i] !~ /^\s/ ){
	    my @chunks = split( /^\s+$/m, ${$dataref}[$i] );
	    splice( @$dataref, $i, 1, @chunks );
	}
    }
}


sub pod2html {
    local(@ARGV) = @_;
    local($/);
    local $_;

    init_globals();

    $Is83 = 0 if (defined (&Dos::UseLFN) && Dos::UseLFN());

    # cache of %Pages and %Items from last time we ran pod2html

    #undef $opt_help if defined $opt_help;

    # parse the command-line parameters
    parse_command_line();

    # escape the backlink argument (same goes for title but is done later...)
    $Backlink = html_escape($Backlink) if defined $Backlink;

    # set some variables to their default values if necessary
    local *POD;
    unless (@ARGV && $ARGV[0]) {
	$Podfile  = "-" unless $Podfile;	# stdin
	open(POD, "<$Podfile")
		|| die "$0: cannot open $Podfile file for input: $!\n";
    } else {
	$Podfile = $ARGV[0];  # XXX: might be more filenames
	*POD = *ARGV;
    }
    $Htmlfile = "-" unless $Htmlfile;	# stdout
    $Htmlroot = "" if $Htmlroot eq "/";	# so we don't get a //
    $Htmldir =~ s#/\z## ;               # so we don't get a //
    if (  $Htmlroot eq ''
       && defined( $Htmldir )
       && $Htmldir ne ''
       && substr( $Htmlfile, 0, length( $Htmldir ) ) eq $Htmldir
       )
    {
	# Set the 'base' url for this file, so that we can use it
	# as the location from which to calculate relative links
	# to other files. If this is '', then absolute links will
	# be used throughout.
        $Htmlfileurl= "$Htmldir/" . substr( $Htmlfile, length( $Htmldir ) + 1);
    }

    # read the pod a paragraph at a time
    warn "Scanning for sections in input file(s)\n" if $Verbose;
    $/ = "";
    my @poddata  = <POD>;
    close(POD);

    # be eol agnostic
    for (@poddata) {
	if (/\r/) {
	    if (/\r\n/) {
		@poddata = map { s/\r\n/\n/g;
				 /\n\n/ ?
				     map { "$_\n\n" } split /\n\n/ :
				     $_ } @poddata;
	    } else {
		@poddata = map { s/\r/\n/g;
				 /\n\n/ ?
				     map { "$_\n\n" } split /\n\n/ :
				     $_ } @poddata;
	    }
	    last;
	}
    }

    clean_data( \@poddata );

    # scan the pod for =head[1-6] directives and build an index
    my $index = scan_headings(\%Sections, @poddata);

    unless($index) {
	warn "No headings in $Podfile\n" if $Verbose;
    }

    # open the output file
    open(HTML, ">$Htmlfile")
	    || die "$0: cannot open $Htmlfile file for output: $!\n";

    # put a title in the HTML file if one wasn't specified
    if ($Title eq '') {
	TITLE_SEARCH: {
 	    for (my $i = 0; $i < @poddata; $i++) {
		if ($poddata[$i] =~ /^=head1\s*NAME\b/m) {
 		    for my $para ( @poddata[$i, $i+1] ) {
			last TITLE_SEARCH
			    if ($Title) = $para =~ /(\S+\s+-+.*\S)/s;
		    }
		}

	    }
	}
    }
    if (!$Title and $Podfile =~ /\.pod\z/) {
	# probably a split pod so take first =head[12] as title
 	for (my $i = 0; $i < @poddata; $i++) {
	    last if ($Title) = $poddata[$i] =~ /^=head[12]\s*(.*)/;
	}
	warn "adopted '$Title' as title for $Podfile\n"
	    if $Verbose and $Title;
    }