From d43ed5994e75cf76bcc42a2478a2b52ee59b3237 Mon Sep 17 00:00:00 2001
From: OlivierRaginel <OlivierRaginel@0b4bb1d4-4e5a-0410-9cc4-b2b747904278>
Date: Wed, 7 Jan 2009 21:33:03 +0000
Subject: [PATCH] Item689: Link %TWiki::cfg to %Foswiki::cfg in
 TWikiCompatibility plugin, and fix configure to handle %TWiki::cfg

git-svn-id: http://svn.foswiki.org/trunk@1836 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
---
 TWikiCompatibilityPlugin/lib/TWiki.pm    |  1 +
 core/lib/Foswiki/Configure/FoswikiCfg.pm |  6 +--
 core/lib/Foswiki/Configure/Load.pm       | 57 ++++++++++++++++++++++++
 3 files changed, 61 insertions(+), 3 deletions(-)

diff --git a/TWikiCompatibilityPlugin/lib/TWiki.pm b/TWikiCompatibilityPlugin/lib/TWiki.pm
index 3800a6cdf4..a25e2fc40f 100644
--- a/TWikiCompatibilityPlugin/lib/TWiki.pm
+++ b/TWikiCompatibilityPlugin/lib/TWiki.pm
@@ -11,5 +11,6 @@ sub TWiki::new {
 }
 
 %TWiki::regex = %Foswiki::regex;
+%TWiki::cfg   = %Foswiki::cfg;
 
 1;
diff --git a/core/lib/Foswiki/Configure/FoswikiCfg.pm b/core/lib/Foswiki/Configure/FoswikiCfg.pm
index ed5ec37c05..2923a3b486 100644
--- a/core/lib/Foswiki/Configure/FoswikiCfg.pm
+++ b/core/lib/Foswiki/Configure/FoswikiCfg.pm
@@ -200,9 +200,9 @@ sub _parse {
             $open = new Foswiki::Configure::Value( typename => $1, opts => $2 );
         }
 
-        elsif ( $l =~ /^#?\s*\$(Foswiki::)?cfg([^=\s]*)\s*=(.*)$/ ) {
-            my $keys         = $2;
-            my $tentativeVal = $3;
+        elsif ( $l =~ /^#?\s*\$(?:(?:Fosw|TW)iki::)?cfg([^=\s]*)\s*=(.*)$/ ) {
+            my $keys         = $1;
+            my $tentativeVal = $2;
             if ( $open && $open->isa('SectionMarker') ) {
                 pusht( \@settings, $open );
                 $open = undef;
diff --git a/core/lib/Foswiki/Configure/Load.pm b/core/lib/Foswiki/Configure/Load.pm
index 42a64484b3..a331bb01d1 100644
--- a/core/lib/Foswiki/Configure/Load.pm
+++ b/core/lib/Foswiki/Configure/Load.pm
@@ -149,6 +149,63 @@ sub readDefaults {
         _loadDefaultsFrom( "$dir/TWiki/Plugins",   $root, \%read, \@errors );
         _loadDefaultsFrom( "$dir/TWiki/Contrib",   $root, \%read, \@errors );
     }
+    if ( defined %TWiki::cfg ) {
+
+        # We had some TWiki plugins, need to map their config to Foswiki
+        sub mergeHash {
+
+          # Merges the keys in the right hashref to the ones in the left hashref
+            my ( $left, $right, $errors ) = @_;
+            while ( my ( $key, $value ) = each %$right ) {
+                if ( exists $left->{$key} ) {
+                    if ( ref($value) ne ref( $left->{$key} ) ) {
+                        push @$errors,
+                            'Trying to overwrite $Foswiki::cfg{' 
+                          . $key
+                          . '} with its $TWiki::cfg version ('
+                          . $value . ')';
+                    }
+                    elsif ( ref($value) eq 'SCALAR' ) {
+                        $left->{$key} = $value;
+                    }
+                    elsif ( ref($value) eq 'HASH' ) {
+                        $left->{$key} =
+                          mergeHash( $left->{$key}, $value, $errors );
+                    }
+                    elsif ( ref($value) eq 'ARRAY' ) {
+
+                        # It's an array. try to be smart
+                        # SMELL: Ideally, it should keep order too
+                        foreach my $item (@$value) {
+                            unless ( grep /^$item$/, @{ $left->{$key} } ) {
+
+                         # The item isn't in the current list, add it at the end
+                                unshift @{ $left->{$key} }, $item;
+                            }
+                        }
+                    }
+                    else {
+
+                        # It's something else (GLOB, coderef, ...)
+                        push @$errors,
+                            '$TWiki::cfg{' 
+                          . $key
+                          . '} is a reference to a'
+                          . ref($value)
+                          . '. No idea how to merge that, sorry.';
+                    }
+                }
+                else {
+
+                    # We don't already have such a key in the Foswiki scope
+                    $left->{$key} = $value;
+                }
+            }
+            return $left;
+        }
+        mergeHash \%Foswiki::cfg, \%TWiki::cfg, \@errors;
+    }    # define %TWiki::cfg
+
     return \@errors;
 }