Added framework tasks to build and install Markdown.framework.

Markdown can now be used directly from Objective-C by simply loading
the framework and sending messages to the NuMarkdown class.

Nukefile

@@ -1,4 +1,17 @@
 
+;; source files
+(set @m_files     (filelist "^objc/.*.m$"))
+(set @nu_files 	  (filelist "^nu/.*nu$"))
+(set @frameworks  '("Cocoa" "Nu"))
+
+;; framework description
+(set @framework 			 "Markdown")
+(set @framework_identifier   "nu.programming.markdown")
+(set @framework_creator_code "????")
+(set @framework_initializer  "MarkdownInit")
+
+(compilation-tasks)
+(framework-tasks)
 
 (task "bin/nudown" is
       (SH "gcc objc/nudown.m -o bin/nudown -framework Cocoa -framework Nu"))
@@ -10,4 +23,10 @@
       (SH "rm test/SimpleTests/*.html")
       (SH "rm test/MarkdownTests/*.html"))
 
-(task "default" => "bin/nudown")
+(task "clobber" => "clean" is
+      (system "rm -rf #{@framework_dir}"))
+
+(task "default" => "framework")
+
+(task "install" => "framework" is
+      (SH "ditto #{@framework_dir} /Library/Frameworks/#{@framework_dir}"))

bin/nudown

@@ -0,0 +1,6 @@
+#!/usr/bin/env nush
+(load "Markdown")
+
+(puts (NuMarkdown convert:((NSString alloc) 
+                           initWithData:((NSFileHandle fileHandleWithStandardInput) readDataToEndOfFile) 
+                           encoding:NSUTF8StringEncoding)))