source: main/trunk/greenstone2/bin/script/pluginfo.pl@ 25499

#!/usr/bin/perl -w

###########################################################################
#
# pluginfo.pl --
# A component of the Greenstone digital library software
# from the New Zealand Digital Library Project at the 
# University of Waikato, New Zealand.
#
# Copyright (C) 1999 New Zealand Digital Library Project
#
# This program 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 of the License, 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
###########################################################################

# This program will print info about a plugin

use strict;
no strict 'subs'; # allow barewords (eg STDERR) as function arguments

BEGIN {
    die "GSDLHOME not set\n" unless defined $ENV{'GSDLHOME'};
    die "GSDLOS not set\n" unless defined $ENV{'GSDLOS'};
    unshift (@INC, "$ENV{'GSDLHOME'}/perllib");
    unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan");
#    unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan/perl-5.8");
    unshift (@INC, "$ENV{'GSDLHOME'}/perllib/plugins");

    if (defined $ENV{'GSDLEXTS'}) {
    my @extensions = split(/:/,$ENV{'GSDLEXTS'});
    foreach my $e (@extensions) {
        my $ext_prefix = "$ENV{'GSDLHOME'}/ext/$e";

        unshift (@INC, "$ext_prefix/perllib");
        unshift (@INC, "$ext_prefix/perllib/cpan");
        unshift (@INC, "$ext_prefix/perllib/plugins");
    }
    }
    if (defined $ENV{'GSDL3EXTS'}) {
    my @extensions = split(/:/,$ENV{'GSDL3EXTS'});
    foreach my $e (@extensions) {
        my $ext_prefix = "$ENV{'GSDL3SRCHOME'}/ext/$e";

        unshift (@INC, "$ext_prefix/perllib");
        unshift (@INC, "$ext_prefix/perllib/cpan");
        unshift (@INC, "$ext_prefix/perllib/plugins");
    }
    }

}

use plugin;
use util;
use gsprintf;
use printusage;
use parse2;

my $arguments =
    [ { 'name' => "site",
    'desc' => "{pluginfo.site}",
    'type' => "string",
    'reqd' => "no" },
      { 'name' => "collection",
    'desc' => "{pluginfo.collection}",
    'type' => "string",
    'reqd' => "no" },
      { 'name' => "xml",
    'desc' => "{scripts.xml}",
    'type' => "flag",
    'reqd' => "no" },
      { 'name' => "listall",
    'desc' => "{scripts.listall}",
    'type' => "flag",
    'reqd' => "no" },
      { 'name' => "describeall",
    'desc' => "{scripts.describeall}",
    'type' => "flag",
    'reqd' => "no" },
      { 'name' => "language",
    'desc' => "{scripts.language}",
    'type' => "string",
    'reqd' => "no" } ];

my $options = { 'name' => "pluginfo.pl",
        'desc' => "{pluginfo.desc}",
        'args' => $arguments };

sub gsprintf
{
    return &gsprintf::gsprintf(@_);
}


sub main {
    my $site = "";
    my $collection = "";
    my $xml = 0;
    my $listall = 0;
    my $describeall = 0;
    my ($language, $encoding);

    my $hashParsingResult = {};
    # general options available to all plugins
    my $unparsed_args = parse2::parse(\@ARGV,$arguments,$hashParsingResult,"allow_extra_options");
    # parse returns -1 if an error occurred
    if ($unparsed_args == -1) {
    
    PrintUsage::print_txt_usage($options, "{pluginfo.params}");
    die "\n";
    }
    
    foreach my $strVariable (keys %$hashParsingResult)
    {
    my $value = $hashParsingResult->{$strVariable};
    # test to make sure the variable name is 'safe'
    if ($strVariable !~ /^\w+$/) {
        die "variable name '$strVariable' isn't safe!";
    }
    eval "\$$strVariable = \$value";
    }

    if ($xml) {
    &gsprintf::set_print_freetext_for_xml();
    }

    # if language wasn't specified, see if it is set in the environment
    # (LC_ALL or LANG)
    if (!$language && ($_=$ENV{'LC_ALL'} or $_=$ENV{'LANG'})) {
    m/^([^\.]+)\.?(.*)/;
    $language=$1;
    $encoding=$2; # might be undef...
# gsprintf::load_language* thinks "fr" is completely different to "fr_FR"...
    $language =~ s/_.*$//;
    }

    # If $language has been set, load the appropriate resource bundle
    # (Otherwise, the default resource bundle will be loaded automatically)
    if ($language) {
    gsprintf::load_language_specific_resource_bundle($language);
    if ($encoding) {
        $encoding =~ tr/-/_/;
        $encoding = lc($encoding);
        $encoding =~ s/utf_8/utf8/; # special
        $gsprintf::specialoutputencoding=$encoding;
    }
    }

    # If there is not exactly 1 argument left (plugin name), then the arguments were wrong
    # If the user specified -h, then we output the usage also
    if((@ARGV && $ARGV[0] =~ /^\-+h/) )
    {
    PrintUsage::print_txt_usage($options, "{pluginfo.params}");  
        die "\n";
    }

    # If there is not exactly 1 argument left (plugin name), then the arguments were wrong (apart from if we had listall or describeall set)
    if ($listall == 0 && $describeall ==0 && $unparsed_args == 0) {
    gsprintf(STDERR, "{pluginfo.no_plugin_name}\n\n");
    PrintUsage::print_txt_usage($options, "{pluginfo.params}", 1);
    die "\n";
    }

    # we had some arguments that we weren't expecting
    if ($unparsed_args > 1) {
    pop(@ARGV); # assume that the last arg is the plugin name
    gsprintf(STDERR, "{common.invalid_options}\n\n", join (',', @ARGV));
    PrintUsage::print_txt_usage($options, "{pluginfo.params}", 1);
    die "\n";
    }
    
    my $plugin = shift (@ARGV);
    if (defined $plugin) {
    $plugin =~ s/\.pm$//; # allow xxxPlugin.pm as the argument
    }

    if ($site ne "") {
    # assume Greenstone 3
    if ($collection ne "") {
        $ENV{'GSDLCOLLECTDIR'} = &util::filename_cat ($ENV{'GSDL3HOME'}, "sites", $site, "collect", $collection);
    } else {
        # Probably more useful to default to GS2 area for plugins
        $ENV{'GSDLCOLLECTDIR'} = $ENV{'GSDLHOME'};
    }
    }
    else {
    if ($collection ne "") {
        $ENV{'GSDLCOLLECTDIR'} = &util::filename_cat ($ENV{'GSDLHOME'}, "collect", $collection);
    } else {
        $ENV{'GSDLCOLLECTDIR'} = $ENV{'GSDLHOME'};
    }
    }

    if ($listall || $describeall) {
    my $plugins_dir = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "perllib", "plugins");
    my @plugin_list = ();
    if (opendir (INDIR, $plugins_dir)) {
        @plugin_list = grep (/Plugin\.pm$/, readdir (INDIR));
        closedir (INDIR);
    }

    if ((defined $ENV{'GSDLEXTS'}) && ($collection eq "")) {
        my @extensions = split(/:/,$ENV{'GSDLEXTS'});
        foreach my $e (@extensions) {
        my $ext_prefix = &util::filename_cat($ENV{'GSDLHOME'},"ext",$e);
        my $ext_plugins_dir = &util::filename_cat($ext_prefix, "perllib", "plugins");

        if (opendir (INDIR, $ext_plugins_dir)) {
            my @ext_plugin_list = grep (/Plugin\.pm$/, readdir (INDIR));
            closedir (INDIR);

            push(@plugin_list,@ext_plugin_list);
        }

        }
    }
    if ((defined $ENV{'GSDL3EXTS'}) && ($collection eq "")) {
        my @extensions = split(/:/,$ENV{'GSDL3EXTS'});
        foreach my $e (@extensions) {
        my $ext_prefix = &util::filename_cat($ENV{'GSDL3SRCHOME'},"ext",$e);
        my $ext_plugins_dir = &util::filename_cat($ext_prefix, "perllib", "plugins");

        if (opendir (INDIR, $ext_plugins_dir)) {
            my @ext_plugin_list = grep (/Plugin\.pm$/, readdir (INDIR));
            closedir (INDIR);

            push(@plugin_list,@ext_plugin_list);
        }

        }
    }

    # load up the plugins before writing out the xml so that any error
    # messages are not inside the XML output (can cause parsing to fail)
    my @plugobj_list;
    foreach my $plugin (@plugin_list) {
        $plugin =~ s/\.pm$//;
        my $plugobj = &plugin::load_plugin_for_info ($plugin);
        push (@plugobj_list, $plugobj);
    }

    &gsprintf::set_print_xml_tags();
    print STDERR "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
    print STDERR "<PluginList length=\"" . scalar(@plugin_list) . "\">\n";
    foreach my $plugobj (@plugobj_list) {
        if ($describeall) {
        $plugobj->print_xml_usage(0);
        }
        else {
        $plugobj->print_xml_usage(0, 1);
        }
    }
    print STDERR "</PluginList>\n";


    }
    else {
    &print_single_plugin($plugin, $xml, 1);
    }
}


sub print_single_plugin {
    my ($plugin, $xml, $header) = @_;
    my $plugobj = &plugin::load_plugin_for_info ($plugin);
    if ($xml) {
    &gsprintf::set_print_xml_tags();
    $plugobj->print_xml_usage($header);
    }
    else {

    # this causes us to automatically send output to a pager, if one is
    # set, AND our output is going to a terminal
    # active state perl on windows doesn't do open(handle, "-|");
    if ($ENV{'GSDLOS'} !~ /windows/ && -t STDOUT) {
        my $pager = $ENV{"PAGER"};
        if (! $pager) {$pager="(less || more)"}
        my $pid = open(STDIN, "-|"); # this does a fork... see man perlipc(1)
        if (!defined $pid) {
        gsprintf(STDERR, "pluginfo.pl - can't fork: $!");
        } else {
        if ($pid != 0) { # parent (ie forking) process. child gets 0
            exec ($pager);
        }
        }
        open(STDERR,">&STDOUT"); # so it's easier to pipe output
    }

    gsprintf(STDERR, "\n{pluginfo.passing_options}\n\n");
    gsprintf(STDERR, "{pluginfo.option_types}:\n\n");
    gsprintf(STDERR, "{pluginfo.specific_options}\n\n");
    gsprintf(STDERR, "{pluginfo.general_options}\n\n");
    gsprintf(STDERR, "$plugin {pluginfo.info}:\n\n");
    
    $plugobj->print_txt_usage();
    }
    
}

&main ();