#!/usr/bin/perl -w
#
# phpwiki configuration file migration script
#
# Author:   Matt Brown <matt@mattb.net.nz>
# Version:  $Id: migrate-phpwiki-config 107 2005-10-21 10:57:16Z matt $
#
# Run this script without any arguments for usage information.
#
# This script 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.
#
# PhpWiki 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 PhpWiki; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# Store the values
# In the form $values{$varname} = (value, comment_state)
# Where value is the value in index.php and comment_state indicates
# whether the line was commented or not
%values = ();

# Check we got a template specified on the command line
if ($#ARGV < 0) {
    print "Usage: ./phpwiki-migrate-config <config-template.ini>\n\n";
    print "Takes an old style (<= 1.3.9) index.php configuration file\n";
    print "for phpwiki and outputs a new style (>= 1.3.10) config.ini\n";
    print "configuration file for phpwiki based on a supplied template.\n";
    print "\n";
    print "config-template.ini should be a valid phpwiki config.ini\n";
    print "file with each valid directive occuring only once and\n";
    print "uncommented. The value of the directive in the template\n";
    print "should be set to a default value.\n\n";
    print "The values extracted from the old config file will be\n";
    print "substituted into this file as necessary. Commented out\n";
    print "directives in index.php will remain commented in config.ini\n";
    
    exit 1;
}

# Read in values from index.php which should be piped to stdin
open INDEXPHP, "-";

$epmaj = 0;
$epmin = 0;

while (<INDEXPHP>)
{
    $name = "";
    # Check if the line starts with a comment (# or / char)
    $is_comment = /^[#\/]/;
    if (!$is_comment) {
        $is_comment = 0;
    }
    
    # Process expire parameters
    if (/'keep'/) {
        ($value) = (/'keep'\s*=>\s*(.*)\)/);
        if ($epmaj) {
            $name = "MAJOR_KEEP";
        } elsif ($epmin) {
            $name = "MINOR_KEEP";
        }
    }
    $epmaj = 0;
    $epmin = 0;

    # Skip some known bad options
    if (/ALLOW_LDAP_LOGIN/) {
        next;
    } elsif (/ALLOW_IMAP_LOGIN/) {
        next;
        
    # Process defined values
    } elsif (/define\s*\(/) {
        # Extract the name of the define and the value of it
        ($name, $value) = (/define\s*\(\s*['"](.*)['"]\s*,\s*['"]*([^'"]*)['"]*\s*\)/);

    # Process PHP variable values
    } elsif (/HTML_DUMP_SUFFIX\s*=/) {
        ($name, $value) = (/\$(\w*)\s*=\s*['"](.*)['"];\s*/);
    } elsif (/AllowedProtocols\s*=/) {
        ($value) = (/\$\w*\s*=\s*(.*);\s*/);
        $name = "ALLOWED_PROTOCOLS";
    } elsif (/InlineImages\s*=/) {
        ($value) = (/\$\w*\s*=\s*(.*);\s*/);
        $name = "INLINE_IMAGES";
    } elsif (/WikiNameRegexp\s*=/) {
        ($value) = (/\$\w*\s*=\s*(.*);\s*/);
        $name = "WIKI_NAME_REGEXP";

    # Process arrays that need to be converted
    } elsif (/GenericPages\s*=/) {
        ($value) = (/\$\w*\s*=\s*array\((.*)\)/);
        $name = "DEFAULT_WIKI_PAGES";
        $value =~ s/[" ]//g;
        $value =~ s/,/:/g;
        $value = "\"$value\""
    } elsif (/keywords\s*=/) {
        ($value) = (/\$\w*\s*=\s*array\((.*)\)/);
        $name = "KEYWORDS";
        $value =~ s/[" ]//g;
        $value =~ s/,/:/g;
        $value = "\"$value\""
        
    # Process database paramters
    } elsif (/'dbtype'\s*=>/) {
        ($value) = (/'dbtype'\s*=>\s*['"](.*)['"]/);
        $name = "DATABASE_TYPE";
    } elsif (/'dsn'\s*=>/) {
        ($value) = (/'dsn'\s*=>\s*['"](.*)['"]/);
        $name = "DATABASE_DSN";
    } elsif (/'timeout'\s*=>/) {
        ($value) = (/'timeout'\s*=>\s*(.*)\s*,/);
        $name = "DATABASE_TIMEOUT";
    } elsif (/'db_session_table'\s*=>/) {
        ($value) = (/'db_session_table'\s*=>\s*['"](.*)['"]/);
        $name = "DATABASE_SESSION_TABLE";
    } elsif (/'prefix'\s*=>/) {
        ($value) = (/'prefix'\s*=>\s*['"](.*)['"]/);
        $name = "DATABASE_PREFIX";
    } elsif (/'directory'\s*=>/) {
        ($value) = (/'directory'\s*=>\s*['"](.*)['"]/);
        $name = "DATABASE_DIRECTORY";
    } elsif (/'dba_handler'\s*=>/) {
        ($value) = (/'dba_handler'\s*=>\s*['"](.*)['"]/);
        $name = "DATABASE_DBA_HANDLER";
    
    # Process Expire Parameters
    } elsif (/\$ExpireParams\['major'\]\s*=/) {
        ($value) = (/'max_age'\s*=>\s*(.*),/);
        $name = "MAJOR_MAX_AGE";
        $epmaj = 1;
    } elsif (/\$ExpireParams\['minor'\]\s*=/) {
        ($value) = (/'max_age'\s*=>\s*(.*),/);
        $name = "MINOR_MAX_AGE";
        $epmin = 1;
        
    # Process include path
    } elsif (/ini_set.*include_path'/) {
        ($value) = (/ini_set.*include_path'\s*,\s*(.*)\s*\)/);
        $name = "INCLUDE_PATH";
        
    }
    if ($name =~ /^$/) {
        next;
    }
    
    # Put it into the array
    if (exists $values{$name} && $is_comment) {
        # If we already have a value and this one is commented, skip it
        next;
    }
    #print "$name => $value ($is_comment)\n";
    $values{$name} = [$value, $is_comment];
        
}

close INDEXPHP;

# Print values we got
#for my $name ( keys %values ) {
#    ($value, $is_comment) = @{$values{$name}};
#    print "$name => $value";
#    if ($is_comment) { print " (commented)"; }
#    print "\n";
#}

# Write out migration header
print "; phpwiki 1.3.10 configuration automatically generated by\n";
print "; migrate-phpwiki-config script\n\n";

# Write out config.ini, substituting values as needed
open CONFTEMP, "< $ARGV[0]"
    or die "Failed to open $ARGV[0]: $!\n";

while (<CONFTEMP>)
{
    # Look for config var lines
    if (!/\w* = /) {
        print $_;
        next;
    }

    ($name) = (/(\w*) = /);
    if (!exists $values{$name}) {
        print $_;
        next;
    }
    ($value, $is_comment) = @{$values{$name}};
    if ($is_comment) {
        print "; $name = $value\n";
    } else {
        print "$name = $value\n";
    }
}

close CONFTEMP;

exit 0;