optimisation: detect scan mode and avoid generating image

diff --git a/IkiWiki/Plugin/img.pm b/IkiWiki/Plugin/img.pm
index 88a3d7b4d6f299a4f46efceb21a6cac75f73fbf6..b6e7c9e41db20db9639ec7927a2994a0560a799e 100644 (file)
--- a/IkiWiki/Plugin/img.pm
+++ b/IkiWiki/Plugin/img.pm
@@ -32,6 +32,11 @@ sub preprocess (@) { #{{{
        }
 
        push @{$links{$params{page}}}, $image;
+       # optimisation: detect scan mode, and avoid generating the image
+       if (! defined wantarray) {
+               return;
+       }
+
        my $file = bestlink($params{page}, $image);
 
        my $dir = $params{page};