From cadd995d6b44dc5e2145904ea0a0fba95a6643b9 Mon Sep 17 00:00:00 2001
From: murphy <murphy@rubychan.de>
Date: Sun, 6 Nov 2005 01:28:19 +0000
Subject: helpers/plugin.rb: New plugin mapping system _maps added; demos
 adjusted

TODO updated
---
 lib/coderay/helpers/plugin.rb | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

(limited to 'lib/coderay/helpers/plugin.rb')

diff --git a/lib/coderay/helpers/plugin.rb b/lib/coderay/helpers/plugin.rb
index 63c3739..6fcfe35 100644
--- a/lib/coderay/helpers/plugin.rb
+++ b/lib/coderay/helpers/plugin.rb
@@ -69,6 +69,7 @@ module PluginHost
 	def plugin_path *args
 		unless args.empty?
 			@plugin_path = File.join(*args)
+			load_map
 		end
 		@plugin_path
 	end
@@ -110,6 +111,7 @@ module PluginHost
 		@plugin_hash ||= create_plugin_hash
 	end
 
+	# Makes a map of all loaded scanners.
 	def inspect
 		map = plugin_hash.dup
 		map.each do |id, plugin|
@@ -118,6 +120,32 @@ module PluginHost
 		map.inspect
 	end
 
+	# Map a plugin_id to another.
+	#
+	# Usage: Put this in a file plugin_path/_map.rb.
+	#
+	#  class MyColorHost < PluginHost
+	#    map :navy => :dark_blue,
+	#      :maroon => :brown,
+	#      :luna => :moon
+	#  end
+
+	def map hash
+		for from, to in hash
+			from = validate_id from
+			to = validate_id to
+			plugin_hash[from] = to unless plugin_hash.has_key? from
+		end
+	end
+
+	def load_map
+		begin
+			require path_to('_map')
+		rescue LoadError
+			warn 'no _map.rb found for %s' % name if $DEBUG
+		end
+	end
+
 
 	# Every plugin must register itself for one or more
 	# +ids+ by calling register_for, which calls this method.
@@ -138,7 +166,9 @@ module PluginHost
 	# 
 	# The extension .rb is not included.
 	def all_plugin_names
-		Dir[path_to('*')].map do |file|
+		Dir[path_to('*')].select do |file|
+			File.basename(file)[/^(?!_)\w+\.rb$/]
+		end.map do |file|
 			File.basename file, '.rb'
 		end
 	end
@@ -156,7 +186,11 @@ module PluginHost
 	# Example:
 	#  yaml_plugin = MyPluginHost[:yaml]
 	def [] id, *args, &blk
-		plugin_hash.[] validate_id(id), *args, &blk
+		plugin = validate_id(id)
+		begin
+			plugin = plugin_hash.[] plugin, *args, &blk
+		end while plugin.is_a? Symbol
+		plugin
 	end
 
 	# Alias for +[]+.
-- 
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