#! @PERL@

# Extract R object INDEX information from Rd files.
# Usage: R CMD Rdindex [options] files
# The titles are nicely formatted between two columns (defaults are 25
# and 72, respectively).

# Copyright (C) 1997-2000 Kurt Hornik and Fritz Leisch
#
# This document is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# A copy of the GNU General Public License is available via WWW at
# http://www.gnu.org/copyleft/gpl.html.  You can also obtain it by
# writing to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA  02111-1307  USA.

use Getopt::Long;

my $revision = ' $Revision: 1.6.8.1 $ ';
my $version;
my $name;

$revision =~ / ([\d\.]*) /;
$version = $1;
($name = $0) =~ s|.*/||;

sub version {
    print STDERR <<END;
Rdindex $version
Copyright (C) 1997-2000 Kurt Hornik and Fritz Leisch
This is free software; see the GNU General Public Licence version 2
or later for copying conditions.  There is NO warranty.    
END
    exit 0;
}

sub usage {
    print STDERR <<END;
Usage: R CMD Rdindex [options] FILES

Create an index table from the R documentation sources specified by
FILES, by either giving the paths to the files, or the path to a
directory with the sources of a package.  The titles are nicely
formatted between two column positions (defaults are 25 and 72,
respectively).

Options:
  -h, --help            print short help message and exit
  -v, --version         print version info and exit
  -l, --left=X		make X the left column for title formatting
  -r, --right=Y		make Y the right column for title formatting
  -d, --data            include only data documentation files if a
                        directory was specified

Email bug reports to <r-bugs\@lists.r-project.org>.
END
    exit 0; 
}

my @options = ("h|help", "v|version", "l|left=s", "r|right=s",
	       "d|data");
GetOptions(@options) || &usage();

&version() if $opt_v;
&usage() if $opt_h;
$opt_l = 25 unless $opt_l;
$opt_r = 72 unless $opt_r;

my $l1 = $opt_l - 2;
my $l2 = $opt_r - $opt_l;

my $cmd = "format short =\n";
$cmd .= "@" . rep("<", $l1) . " ^" . rep("<", $l2) . "\n";
$cmd .= "\$name, \$desc\n";
$cmd .= ".\n";
eval($cmd);

$cmd = "format long =\n";
$cmd .= "@" . rep("<", $opt_r) . "\n";
$cmd .= "\$name\n";
$cmd .= ".\n";
eval($cmd);

$cmd = "format cont =\n";
$cmd .= "~" . rep(" ", $l1) . " ^" . rep("<", $l2) . "\n";
$cmd .= "\$desc\n";
$cmd .= ".\n";
eval($cmd);
    
my $dir;
if ($#ARGV == 0 && -d $ARGV[0]) {
    $dir = $ARGV[0];
    if (-d "$dir/man") {
 	$dir = "$dir/man";
    }
    @Rdfiles = `LC_ALL=C find $dir -name "*.[Rr]d" -print | \
                  sed -e '/windows\\//d' | sort`;
    if ($opt_d) {
	my @tmp = ();
	foreach $f (@Rdfiles) {
	    @tmp = (@tmp, `grep -l '\\\\keyword{datasets}' $f`);
	}
	@Rdfiles = @tmp;
    }
    chop(@Rdfiles);
} else {
    @Rdfiles = @ARGV;
}

undef $/;

foreach $file (@Rdfiles) {
    if (!open(FILE, $file)) {
	print STDERR "File $file not found\n";
    }
    else {
	$_ = <FILE>;
	m/\\name\{([^\}]*)\}/;
	$name = $1;
	$l = length($name);
	if ($l <= $l1) {
	    $~ = short;
	}
	else {
	    $~ = long;
	}
	/\\title\{\s*([^\}]+)\s*\}/s;
	$desc = $1;
	write;
	$~ = cont;
	while ($desc) {
	    write;
	}
    }
}

sub rep {
    my $retval = "";
    for($k=0; $k<$_[1]; $k++) {
	$retval .= $_[0];
    }
    $retval;
}

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