source: trunk/third/perl/installhtml @ 17035

#!./perl -w

# This file should really be extracted from a .PL file

use lib 'lib';          # use source library if present

use Config;             # for config options in the makefile
use Getopt::Long;       # for command-line parsing
use Cwd;
use Pod::Html;

=head1 NAME

installhtml - converts a collection of POD pages to HTML format.

=head1 SYNOPSIS

    installhtml  [--help] [--podpath=<name>:...:<name>] [--podroot=<name>]
         [--htmldir=<name>] [--htmlroot=<name>]  [--norecurse] [--recurse]
         [--splithead=<name>,...,<name>]   [--splititem=<name>,...,<name>]
         [--libpods=<name>,...,<name>]  [--verbose]

=head1 DESCRIPTION

I<installhtml> converts a collection of POD pages to a corresponding
collection of HTML pages.  This is primarily used to convert the pod
pages found in the perl distribution.

=head1 OPTIONS

=over 4

=item B<--help> help

Displays the usage.

=item B<--podroot> POD search path base directory

The base directory to search for all .pod and .pm files to be converted.
Default is current directory.

=item B<--podpath> POD search path

The list of directories to search for .pod and .pm files to be converted.
Default is `podroot/.'.

=item B<--recurse> recurse on subdirectories

Whether or not to convert all .pm and .pod files found in subdirectories
too.  Default is to not recurse.

=item B<--htmldir> HTML destination directory

The base directory which all HTML files will be written to.  This should
be a path relative to the filesystem, not the resulting URL.

=item B<--htmlroot> URL base directory

The base directory which all resulting HTML files will be visible at in
a URL.  The default is `/'.

=item B<--splithead> POD files to split on =head directive

Comma-separated list of pod files to split by the =head directive.  The
.pod suffix is optional. These files should have names specified
relative to podroot.

=item B<--splititem> POD files to split on =item directive

Comma-separated list of all pod files to split by the =item directive.
The .pod suffix is optional.  I<installhtml> does not do the actual
split, rather it invokes I<splitpod> to do the dirty work.  As with
--splithead, these files should have names specified relative to podroot.

=item B<--splitpod> Directory containing the splitpod program

The directory containing the splitpod program. The default is `podroot/pod'.

=item B<--libpods> library PODs for LE<lt>E<gt> links

Comma-separated list of "library" pod files.  This is the same list that
will be passed to pod2html when any pod is converted.

=item B<--verbose> verbose output

Self-explanatory.

=back

=head1 EXAMPLE

The following command-line is an example of the one we use to convert
perl documentation:

    ./installhtml --podpath=lib:ext:pod:vms   \
                        --podroot=/usr/src/perl     \
                        --htmldir=/perl/nmanual     \
                        --htmlroot=/perl/nmanual    \
                        --splithead=pod/perlipc     \
                        --splititem=pod/perlfunc    \
                        --libpods=perlfunc,perlguts,perlvar,perlrun,perlop \
                        --recurse \
                        --verbose

=head1 AUTHOR

Chris Hall E<lt>hallc@cs.colorado.eduE<gt>

=head1 TODO

=cut

$usage =<<END_OF_USAGE;
Usage: $0 --help --podpath=<name>:...:<name> --podroot=<name>
         --htmldir=<name> --htmlroot=<name> --norecurse --recurse
         --splithead=<name>,...,<name> --splititem=<name>,...,<name>
         --libpods=<name>,...,<name> --verbose

    --help      - this message
    --podpath   - colon-separated list of directories containing .pod and
                  .pm files to be converted (. by default).
    --podroot   - filesystem base directory from which all relative paths in
                  podpath stem (default is .).
    --htmldir   - directory to store resulting html files in relative
                  to the filesystem (\$podroot/html by default). 
    --htmlroot  - http-server base directory from which all relative paths
                  in podpath stem (default is /).
    --libpods   - comma-separated list of files to search for =item pod
                  directives in as targets of C<> and implicit links (empty
                  by default).
    --norecurse - don't recurse on those subdirectories listed in podpath.
                  (default behavior).
    --recurse   - recurse on those subdirectories listed in podpath
    --splithead - comma-separated list of .pod or .pm files to split.  will
                  split each file into several smaller files at every occurrence
                  of a pod =head[1-6] directive.
    --splititem - comma-separated list of .pod or .pm files to split using
                  splitpod.
    --splitpod  - directory where the program splitpod can be found
                  (\$podroot/pod by default).
    --verbose   - self-explanatory.

END_OF_USAGE

@libpods = ();
@podpath = ( "." );     # colon-separated list of directories containing .pod
                        # and .pm files to be converted.
$podroot = ".";         # assume the pods we want are here
$htmldir = "";          # nothing for now...
$htmlroot = "/";        # default value
$recurse = 0;           # default behavior
@splithead = ();        # don't split any files by default
@splititem = ();        # don't split any files by default
$splitpod = "";         # nothing for now.

$verbose = 0;           # whether or not to print debugging info

$pod2html = "pod/pod2html";

usage("") unless @ARGV;

# Overcome shell's p1,..,p8 limitation.  
# See vms/descrip_mms.template -> descrip.mms for invokation.
if ( $^O eq 'VMS' ) { @ARGV = split(/\s+/,$ARGV[0]); }

# parse the command-line
$result = GetOptions( qw(
        help
        podpath=s
        podroot=s
        htmldir=s
        htmlroot=s
        libpods=s
        recurse!
        splithead=s
        splititem=s
        splitpod=s
        verbose
));
usage("invalid parameters") unless $result;
parse_command_line();


# set these variables to appropriate values if the user didn't specify
#  values for them.
$htmldir = "$htmlroot/html" unless $htmldir;
$splitpod = "$podroot/pod" unless $splitpod;


# make sure that the destination directory exists
(mkdir($htmldir, 0755) ||
        die "$0: cannot make directory $htmldir: $!\n") if ! -d $htmldir;


# the following array will eventually contain files that are to be
# ignored in the conversion process.  these are files that have been
# process by splititem or splithead and should not be converted as a
# result.
@ignore = ();


# split pods.  its important to do this before convert ANY pods because
#  it may effect some of the links
@splitdirs = ();    # files in these directories won't get an index
split_on_head($podroot, $htmldir, \@splitdirs, \@ignore, @splithead);
split_on_item($podroot,           \@splitdirs, \@ignore, @splititem);


# convert the pod pages found in @poddirs
#warn "converting files\n" if $verbose;
#warn "\@ignore\t= @ignore\n" if $verbose;
foreach $dir (@podpath) {
    installdir($dir, $recurse, $podroot, \@splitdirs, \@ignore);
}


# now go through and create master indices for each pod we split
foreach $dir (@splititem) {
    print "creating index $htmldir/$dir.html\n" if $verbose;
    create_index("$htmldir/$dir.html", "$htmldir/$dir");
}

foreach $dir (@splithead) {
    $dir .= ".pod" unless $dir =~ /(\.pod|\.pm)$/;
    # let pod2html create the file
    runpod2html($dir, 1);

    # now go through and truncate after the index
    $dir =~ /^(.*?)(\.pod|\.pm)?$/sm;
    $file = "$htmldir/$1";
    print "creating index $file.html\n" if $verbose;

    # read in everything until what would have been the first =head
    # directive, patching the index as we go.
    open(H, "<$file.html") ||
        die "$0: error opening $file.html for input: $!\n";
    $/ = "";
    @data = ();
    while (<H>) {
        last if /NAME=/;
        $_ =~ s{HREF="#(.*)">}{
            my $url = "$file/$1.html" ;
            $url = Pod::Html::relativize_url( $url, "$file.html" )
                if ( ! defined $opt_htmlroot || $opt_htmlroot eq '' ) ;
            "HREF=\"$url\">" ;
        }eg;
        push @data, $_;
    } 
    close(H);

    # now rewrite the file 
    open(H, ">$file.html") ||
        die "$0: error opening $file.html for output: $!\n";
    print H "@data\n";
    close(H);
}

##############################################################################


sub usage {
    warn "$0: @_\n" if @_;
    die $usage;
}


sub parse_command_line {
    usage() if defined $opt_help;
    $opt_help = "";                 # make -w shut up

    # list of directories
    @podpath   = split(":", $opt_podpath) if defined $opt_podpath;

    # lists of files
    @splithead = split(",", $opt_splithead) if defined $opt_splithead;
    @splititem = split(",", $opt_splititem) if defined $opt_splititem;
    @libpods   = split(",", $opt_libpods) if defined $opt_libpods;

    $htmldir  = $opt_htmldir        if defined $opt_htmldir;
    $htmlroot = $opt_htmlroot       if defined $opt_htmlroot;
    $podroot  = $opt_podroot        if defined $opt_podroot;
    $splitpod = $opt_splitpod       if defined $opt_splitpod;

    $recurse  = $opt_recurse        if defined $opt_recurse;
    $verbose  = $opt_verbose        if defined $opt_verbose;
}


sub absolute_path {
    my($cwd, $path) = @_;
        return "$cwd/$path" unless $path =~ m:/:;
    # add cwd if path is not already an absolute path
    $path = "$cwd/$path" if (substr($path,0,1) ne '/');
    return $path;
}


sub create_index {
    my($html, $dir) = @_;
    my(@files, @filedata, @index, $file);
    my($lcp1,$lcp2);


    # get the list of .html files in this directory
    opendir(DIR, $dir) ||
        die "$0: error opening directory $dir for reading: $!\n";
    @files = sort(grep(/\.html?$/, readdir(DIR)));
    closedir(DIR);

    open(HTML, ">$html") ||
        die "$0: error opening $html for output: $!\n";

    # for each .html file in the directory, extract the index
    #   embedded in the file and throw it into the big index.
    print HTML "<DL COMPACT>\n";
    foreach $file (@files) {
        $/ = "";

        open(IN, "<$dir/$file") ||
            die "$0: error opening $dir/$file for input: $!\n";
        @filedata = <IN>;
        close(IN);

        # pull out the NAME section
        ($name) = grep(/NAME=/, @filedata);
        ($lcp1,$lcp2) = ($name =~ m,/H1>\s(\S+)\s[\s-]*(.*?)\s*$,sm);
        if (defined $lcp1 and $lcp1 eq '<P>') { # Uninteresting.  Try again.
           ($lcp1,$lcp2) = ($name =~ m,/H1>\s<P>\s(\S+)\s[\s-]*(.*?)\s*$,sm);
        }
        my $url= "$dir/$file" ;
        if ( ! defined $opt_htmlroot || $opt_htmlroot eq '' ) {
            $url = Pod::Html::relativize_url( "$dir/$file", $html ) ;
        }

        print HTML qq(<A HREF="$url">);
        print HTML "<DT>$lcp1</A><DD>$lcp2\n" if defined $lcp1;
#       print HTML qq(<A HREF="$url">$lcp1</A><BR>\n") if defined $lcp1;

        next;

        @index = grep(/<!-- INDEX BEGIN -->.*<!-- INDEX END -->/s,
                    @filedata);
        for (@index) {
            s/<!-- INDEX BEGIN -->(\s*<!--)(.*)(-->\s*)<!-- INDEX END -->/$lcp2/s;
            s,#,$dir/$file#,g;
            # print HTML "$_\n";
            print HTML "$_\n<P><HR><P>\n";
        }
    }
    print HTML "</DL>\n";

    close(HTML);
}


sub split_on_head {
    my($podroot, $htmldir, $splitdirs, $ignore, @splithead) = @_;
    my($pod, $dirname, $filename);

    # split the files specified in @splithead on =head[1-6] pod directives
    print "splitting files by head.\n" if $verbose && $#splithead >= 0;
    foreach $pod (@splithead) {
        # figure out the directory name and filename
        $pod      =~ s,^([^/]*)$,/$1,;
        $pod      =~ m,(.*?)/(.*?)(\.pod)?$,;
        $dirname  = $1;
        $filename = "$2.pod";

        # since we are splitting this file it shouldn't be converted.
        push(@$ignore, "$podroot/$dirname/$filename");

        # split the pod
        splitpod("$podroot/$dirname/$filename", "$podroot/$dirname", $htmldir,
            $splitdirs);
    }
}


sub split_on_item {
    my($podroot, $splitdirs, $ignore, @splititem) = @_;
    my($pwd, $dirname, $filename);

    print "splitting files by item.\n" if $verbose && $#splititem >= 0;
    $pwd = getcwd();
        my $splitter = absolute_path($pwd, "$splitpod/splitpod");
    foreach $pod (@splititem) {
        # figure out the directory to split into
        $pod      =~ s,^([^/]*)$,/$1,;
        $pod      =~ m,(.*?)/(.*?)(\.pod)?$,;
        $dirname  = "$1/$2";
        $filename = "$2.pod";

        # since we are splitting this file it shouldn't be converted.
        push(@$ignore, "$podroot/$dirname.pod");

        # split the pod
        push(@$splitdirs, "$podroot/$dirname");
        if (! -d "$podroot/$dirname") {
            mkdir("$podroot/$dirname", 0755) ||
                    die "$0: error creating directory $podroot/$dirname: $!\n";
        }
        chdir("$podroot/$dirname") ||
            die "$0: error changing to directory $podroot/$dirname: $!\n";
        die "$splitter not found. Use '-splitpod dir' option.\n"
            unless -f $splitter;
        system("perl", $splitter, "../$filename") &&
            warn "$0: error running '$splitter ../$filename'"
                 ." from $podroot/$dirname";
    }
    chdir($pwd);
}


#
# splitpod - splits a .pod file into several smaller .pod files
#  where a new file is started each time a =head[1-6] pod directive
#  is encountered in the input file.
#
sub splitpod {
    my($pod, $poddir, $htmldir, $splitdirs) = @_;
    my(@poddata, @filedata, @heads);
    my($file, $i, $j, $prevsec, $section, $nextsec);

    print "splitting $pod\n" if $verbose;

    # read the file in paragraphs
    $/ = "";
    open(SPLITIN, "<$pod") ||
        die "$0: error opening $pod for input: $!\n";
    @filedata = <SPLITIN>;
    close(SPLITIN) ||
        die "$0: error closing $pod: $!\n";

    # restore the file internally by =head[1-6] sections
    @poddata = ();
    for ($i = 0, $j = -1; $i <= $#filedata; $i++) {
        $j++ if ($filedata[$i] =~ /^\s*=head[1-6]/);
        if ($j >= 0) { 
            $poddata[$j]  = "" unless defined $poddata[$j];
            $poddata[$j] .= "\n$filedata[$i]" if $j >= 0;
        }
    }

    # create list of =head[1-6] sections so that we can rewrite
    #  L<> links as necessary.
    %heads = ();
    foreach $i (0..$#poddata) {
        $heads{htmlize($1)} = 1 if $poddata[$i] =~ /=head[1-6]\s+(.*)/;
    }

    # create a directory of a similar name and store all the
    #  files in there
    $pod =~ s,.*/(.*),$1,;      # get the last part of the name
    $dir = $pod;
    $dir =~ s/\.pod//g;
    push(@$splitdirs, "$poddir/$dir");
    mkdir("$poddir/$dir", 0755) ||
        die "$0: could not create directory $poddir/$dir: $!\n"
        unless -d "$poddir/$dir";

    $poddata[0] =~ /^\s*=head[1-6]\s+(.*)/;
    $section    = "";
    $nextsec    = $1;

    # for each section of the file create a separate pod file
    for ($i = 0; $i <= $#poddata; $i++) {
        # determine the "prev" and "next" links
        $prevsec = $section;
        $section = $nextsec;
        if ($i < $#poddata) {
            $poddata[$i+1] =~ /^\s*=head[1-6]\s+(.*)/;
            $nextsec       = $1;
        } else {
            $nextsec = "";
        }

        # determine an appropriate filename (this must correspond with
        #  what pod2html will try and guess)
        # $poddata[$i] =~ /^\s*=head[1-6]\s+(.*)/;
        $file = "$dir/" . htmlize($section) . ".pod";

        # create the new .pod file
        print "\tcreating $poddir/$file\n" if $verbose;
        open(SPLITOUT, ">$poddir/$file") ||
            die "$0: error opening $poddir/$file for output: $!\n";
        $poddata[$i] =~ s,L<([^<>]*)>,
                            defined $heads{htmlize($1)} ? "L<$dir/$1>" : "L<$1>"
                         ,ge;
        print SPLITOUT $poddata[$i]."\n\n";
        print SPLITOUT "=over 4\n\n";
        print SPLITOUT "=item *\n\nBack to L<$dir/\"$prevsec\">\n\n" if $prevsec;
        print SPLITOUT "=item *\n\nForward to L<$dir/\"$nextsec\">\n\n" if $nextsec;
        print SPLITOUT "=item *\n\nUp to L<$dir>\n\n";
        print SPLITOUT "=back\n\n";
        close(SPLITOUT) ||
            die "$0: error closing $poddir/$file: $!\n";
    }
}


#
# installdir - takes care of converting the .pod and .pm files in the
#  current directory to .html files and then installing those.
#
sub installdir {
    my($dir, $recurse, $podroot, $splitdirs, $ignore) = @_;
    my(@dirlist, @podlist, @pmlist, $doindex);

    @dirlist = ();      # directories to recurse on
    @podlist = ();      # .pod files to install
    @pmlist  = ();      # .pm files to install

    # should files in this directory get an index?
    $doindex = (grep($_ eq "$podroot/$dir", @$splitdirs) ? 0 : 1);

    opendir(DIR, "$podroot/$dir")
        || die "$0: error opening directory $podroot/$dir: $!\n";

    # find the directories to recurse on
    @dirlist = map { if ($^O eq 'VMS') {/^(.*)\.dir$/i; "$dir/$1";} else {"$dir/$_";}}
        grep(-d "$podroot/$dir/$_" && !/^\.{1,2}/, readdir(DIR)) if $recurse;
    rewinddir(DIR);

    # find all the .pod files within the directory
    @podlist = map { /^(.*)\.pod$/; "$dir/$1" }
        grep(! -d "$podroot/$dir/$_" && /\.pod$/, readdir(DIR));
    rewinddir(DIR);

    # find all the .pm files within the directory
    @pmlist = map { /^(.*)\.pm$/; "$dir/$1" }
        grep(! -d "$podroot/$dir/$_" && /\.pm$/, readdir(DIR));

    closedir(DIR);

    # recurse on all subdirectories we kept track of
    foreach $dir (@dirlist) {
        installdir($dir, $recurse, $podroot, $splitdirs, $ignore);
    }

    # install all the pods we found
    foreach $pod (@podlist) {
        # check if we should ignore it.
        next if grep($_ eq "$podroot/$pod.pod", @$ignore);

        # check if a .pm files exists too
        if (grep($_ eq "$pod.pm", @pmlist)) {
            print  "$0: Warning both `$podroot/$pod.pod' and "
                . "`$podroot/$pod.pm' exist, using pod\n";
            push(@ignore, "$pod.pm");
        }
        runpod2html("$pod.pod", $doindex);
    }

    # install all the .pm files we found
    foreach $pm (@pmlist) {
        # check if we should ignore it.
        next if grep($_ eq "$pm.pm", @ignore);

        runpod2html("$pm.pm", $doindex);
    }
}


#
# runpod2html - invokes pod2html to convert a .pod or .pm file to a .html
#  file.
#
sub runpod2html {
    my($pod, $doindex) = @_;
    my($html, $i, $dir, @dirs);

    $html = $pod;
    $html =~ s/\.(pod|pm)$/.html/g;

    # make sure the destination directories exist
    @dirs = split("/", $html);
    $dir  = "$htmldir/";
    for ($i = 0; $i < $#dirs; $i++) {
        if (! -d "$dir$dirs[$i]") {
            mkdir("$dir$dirs[$i]", 0755) ||
                die "$0: error creating directory $dir$dirs[$i]: $!\n";
        }
        $dir .= "$dirs[$i]/";
    }

    # invoke pod2html
    print "$podroot/$pod => $htmldir/$html\n" if $verbose;
#system("./pod2html",
        Pod::Html'pod2html(
        #Pod::Html'pod2html($pod2html,
        "--htmldir=$htmldir",
        "--htmlroot=$htmlroot",
        "--podpath=".join(":", @podpath),
        "--podroot=$podroot", "--netscape",
        "--header",
        ($doindex ? "--index" : "--noindex"),
        "--" . ($recurse ? "" : "no") . "recurse",
        ($#libpods >= 0) ? "--libpods=" . join(":", @libpods) : "",
        "--infile=$podroot/$pod", "--outfile=$htmldir/$html");
    die "$0: error running $pod2html: $!\n" if $?;
}

sub htmlize { htmlify(0, @_) }