#! @PERL@
# -*- mode: perl; -*-
#
# Create an index of web pages for MPICH2
#
# Default values
# Root for the pages
$WWWRoot=`pwd`;
chop $WWWRoot;
# Base address (installation address)
$URLBase = "http://www.mcs.anl.gov/mpi/mpich2/www";
# End of line character (\r\n is DOS-friendly)
$eol = "\r\n";
# Number of colums in table of names
$TableCols = 3;
#
# Process arguments for any changes
foreach $_ (@ARGV) {
    if (/-?(-[^=]*)=(.*)/) {
	$argname = $1;
	$argval  = $2;
    }
    else {
	$argname = $1;
	$argval  = "";
    }
    if ($argname =~ /-wwwroot/) {
	$WWWRoot = $argval;
    }
    elsif ($argname =~ /-urlbase/) {
	$URLBase = $argval;
    }
    elsif ($argname eq "-help") {
	print STDOUT "createhtmlindex [ -wwwroot=directory ] [ -urlbase=base ]\n";
	print STDOUT "Build the www index pages for MPICH2.";
	print STDOUT "This must be run in the root of an MPICH2 tree; it may\n
be run in a VPATH directory after configuring.\n";
	exit 1;
    }
    else {
	print STDERR "Unknown argument $_\n";
	exit 1;
    }
}

# Create the main index
open( OUTFD, ">$WWWRoot/www/index.htm" ) || 
    die "Cannot open $WWWRoot/www/index.htm\n";

&AddHeader( "Web pages for MPI and MPE" );

print OUTFD "<H2>MPI Commands</H2>$eol";
&AddDirectoryContents( "www", "www1" );

print OUTFD "<H2>MPI Routines</H2>$eol";
&AddDirectoryContents( "www", "www3" );

#print OUTFD "<H2>MPE Routines</H2>$eol";
#&AddDirectoryContents( "www", "www4" );

&AddTrailer( );

close( OUTFD );

# Create the sectional indices
open( OUTFD, ">$WWWRoot/www/www1/index.htm" ) || 
    die "Cannot open $WWWRoot/www/www1/index.htm\n";

&AddHeader( "Web pages for MPICH2 Commands" );
&AddDirectoryContents( "www/www1", "." );
&AddTrailer( );
close( OUTFD );

open( OUTFD, ">$WWWRoot/www/www3/index.htm" ) || 
    die "Cannot open $WWWRoot/www/www3/index.htm\n";

&AddHeader( "Web pages for MPI Routines" );
&AddDirectoryContents( "www/www3", "." );
&AddTrailer( );
close( OUTFD );

# open( OUTFD, ">$WWWRoot/www/www4/index.htm" ) || 
#     die "Cannot open $WWWRoot/www/www4/index.htm\n";

# &AddHeader( "Web pages for MPE Routines" );
# &AddDirectoryContents( "www/www4", "." );
# &AddTrailer( );
# close( OUTFD );


0;
# ---------------------------------------------------------------------------
# Support routines.
# All write to OUTFD and use $eol for end-of-line
# ---------------------------------------------------------------------------
sub AddHeader {
    my $title = $_[0];
    print OUTFD "<HTML>$eol<HEAD>$eol<TITLE>$title</TITLE>$eol";
    print OUTFD "<!-- This file generated by createhtmlindex on $date -->$eol";
    print OUTFD "</HEAD>$eol<BODY BGCOLOR=\"FFFFFF\">$eol";
    print OUTFD "<H1>$title</H1>$eol";
}

sub AddTrailer {
    print OUTFD "</BODY>$eol</HTML>$eol";
}

# Take all .htm and .html files and add them to the OUTFD file.
# This works in two steps:
# 1. Read and sort the contents of the directory into the array
# @HTMLFiles
# 2. Use the routine MakeHTMLTable to create a table with a given
# number of columns, adding the links within the columns
@HTMLFiles = ();
# Look in $1/$2 for files, but make links relative to $2
sub AddDirectoryContents {
    my $rootdir = $_[0];
    my $dirname = $_[1];
 
    # 1 Read the files
    @HTMLFiles = ();
    opendir DIR, "$rootdir/$dirname";
    if ($dirname eq ".") { 
	$prefixname = "";
    }
    else {
	$prefixname = "$dirname/";
    }
    while ($filename = readdir DIR) {
	if ($filename =~ /index\.html?/) { next; }
	if ($filename =~ /.*\.html?$/) {
	    $HTMLFiles[$#HTMLFiles+1] = "$prefixname$filename";
	}
    }
    closedir DIR;

    @HTMLFiles = sort( @HTMLFiles );

    # Format the table
    &MakeHTMLTable;
}
# MakeHTMLTable takes an array of items and turns them into a table with
# $TableCols columns.
#
sub MakeHTMLTable {
    my $nvals = $#HTMLFiles;

    my $nrows = int ( ($nvals + $TableCols - 1) / $TableCols );
    print OUTFD "<TABLE>$eol";
    for ($j=0; $j<$nrows; $j++) {
	print OUTFD "<TR>";
	for ($e=0; $e<$TableCols; $e++) {
	    $filename = $HTMLFiles[$j + $e * $nrows];
	    $linkname = $filename;
	    $linkname =~ s/\.html?//;
	    $linkname =~ s/.*\///;
	    if ($filename ne "") {
		$line = "<A HREF=\"$filename\">$linkname</A>";
	    }
	    else {
		$line = "";
	    }
	    print OUTFD "<TD>$line</TD>$eol";
	}
	print OUTFD "</TR>$eol";
    }
    print OUTFD "</TABLE>$eol";
}
