function injection overhaul

Add an inject function, that can be used by plugins that want to replace
one of ikiwiki's functions with their own version. (This is a scary thing
that grubs through the symbol table, and replaces all exported occurances
of a function with the injected version.)

external: RPC functions can be injected to replace exported functions.

Removed the stupid displaytime hook, and use injection instead.

1 files changed, 4 insertions, 6 deletions

diff --git a/plugins/externaldemo b/plugins/externaldemo
index 4d13f2444..be7aba8b9 100755
--- a/plugins/externaldemo
+++ b/plugins/externaldemo
@@ -106,9 +106,8 @@ sub import {
 		rpc_call("getvar", "config", "url")."\n";
 
 	# Here's an example of how to inject an arbitrary function into
-	# ikiwiki, replacing a core function.
-	# Note use of automatic memoization.
-	rpc_call("inject", name => "IkiWiki::formattime",
+	# ikiwiki. Note use of automatic memoization.
+	rpc_call("inject", name => "IkiWiki::bob",
 		call => "formattime", memoize => 1);
 
 	print STDERR "externaldemo plugin successfully imported\n";
@@ -126,9 +125,8 @@ sub preprocess {
 	return "externaldemo plugin preprocessing on $title!";
 }
 
-sub formattime {
-	print STDERR "externaldemo plugin's formattime called via RPC";
-	return scalar "formatted time: ".localtime(shift);
+sub bob {
+	print STDERR "externaldemo plugin's bob called via RPC";
 }
 
 # Now all that's left to do is loop and handle each incoming RPC request.