From 50faf0b151e08887b686e88d525b3b3e3b5379e5 Mon Sep 17 00:00:00 2001
From: Joey Hess <joey@kodama.kitenet.net>
Date: Wed, 9 Jan 2008 02:30:46 -0500
Subject: Call preprocessor hooks in void context during the scan pass.

This allows the hook to determine if it's just scanning, and avoid expensive
operations.
---
 IkiWiki.pm | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/IkiWiki.pm b/IkiWiki.pm
index b0ac8bbb4..d001760a2 100644
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -723,12 +723,25 @@ sub preprocess ($$$;$$) { #{{{
 					$command, $page, $preprocessing{$page}).
 				"]]";
 			}
-			my $ret=$hooks{preprocess}{$command}{call}->(
-				@params,
-				page => $page,
-				destpage => $destpage,
-				preview => $preprocess_preview,
-			);
+			my $ret;
+			if (! $scan) {
+				$ret=$hooks{preprocess}{$command}{call}->(
+					@params,
+					page => $page,
+					destpage => $destpage,
+					preview => $preprocess_preview,
+				);
+			}
+			else {
+				# use void context during scan pass
+				$hooks{preprocess}{$command}{call}->(
+					@params,
+					page => $page,
+					destpage => $destpage,
+					preview => $preprocess_preview,
+				);
+				$ret="";
+			}
 			$preprocessing{$page}--;
 			return $ret;
 		}
-- 
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