Introduce PluginLoaderFunc

This allows registered plugins to execute code when loaded. This will
also allow the Lua support code to be a plugin.

Closes: https://todo.sr.ht/~sircmpwn/koushin/54

1 files changed, 8 insertions, 4 deletions

diff --git a/plugin.go b/plugin.go
index 77000f2..4e46aaf 100644
--- a/plugin.go
+++ b/plugin.go
@@ -23,9 +23,13 @@ type Plugin interface {
 	Close() error
 }
 
-var plugins []Plugin
+// PluginLoaderFunc loads plugins for the provided server.
+type PluginLoaderFunc func(*Server) ([]Plugin, error)
 
-// RegisterPlugin registers a plugin to be loaded on server startup.
-func RegisterPlugin(p Plugin) {
-	plugins = append(plugins, p)
+var pluginLoaders []PluginLoaderFunc
+
+// RegisterPluginLoader registers a plugin loader. The loader will be called on
+// server start-up and reload.
+func RegisterPluginLoader(f PluginLoaderFunc) {
+	pluginLoaders = append(pluginLoaders, f)
 }