Allow external plugins to return no value

[ikiwiki.git] / IkiWiki / Plugin / external.pm

diff --git a/IkiWiki/Plugin/external.pm b/IkiWiki/Plugin/external.pm
index 4c2e5d2feb28ce5d842dcf75dab275a3e7855493..204442c1e0b731db6d985cef61181e0c7b0fc424 100644 (file)
--- a/IkiWiki/Plugin/external.pm
+++ b/IkiWiki/Plugin/external.pm
@@ -68,7 +68,22 @@ sub rpc_call ($$;@) { #{{{
                                        return @{$value->value};
                                }
                                elsif ($value->isa('RPC::XML::struct')) {
-                                       return %{$value->value};
+                                       my %hash=%{$value->value};
+
+                                       # XML-RPC v1 does not allow for
+                                       # nil/null/None/undef values to be
+                                       # transmitted, so until
+                                       # XML::RPC::Parser honours v2
+                                       # (<nil/>), external plugins send
+                                       # a hash with one key "null" pointing
+                                       # to an empty string.
+                                       if (exists $hash{null} &&
+                                           $hash{null} eq "" &&
+                                           int(keys(%hash)) == 1) {
+                                               return undef;
+                                       }
+
+                                       return %hash;
                                }
                                else {
                                        return $value->value;
@@ -92,6 +107,14 @@ sub rpc_call ($$;@) { #{{{
                                error("XML RPC call error, unknown function: $name");
                        }
 
+                       # XML-RPC v1 does not allow for nil/null/None/undef
+                       # values to be transmitted, so until XML::RPC::Parser
+                       # honours v2 (<nil/>), send a hash with one key "null"
+                       # pointing to an empty string.
+                       if (! defined $ret) {
+                               $ret={"null" => ""};
+                       }
+
                        my $string=eval { RPC::XML::response->new($ret)->as_string };
                        if ($@ && ref $ret) {
                                # One common reason for serialisation to