Method with pre and post filter

Rakefile

@@ -14,20 +14,24 @@ task :compile do
     require 'rubygems'
     require 'kramdown'
     require 'filters/markdown_macros'
+    require 'filters/mkd_post_latex_macros'
 
     pdfname="my_book"
     
-    filters=[]
-    filters<<=MarkdownMacros.new
+    prefilters=[]
+    prefilters<<=MarkdownMacros.new
     
+    postfilters=[]
+    postfilters<<=MarkdownPostLatexMacros.new
+
     include_list=[]
     Dir.glob("content/**/*.md").each do |file|
         text=""
         puts file
         tmp=File.new(file,"r").read
         # pre filters
-        filters.each do |f| 
-            tmp=f.prefilter( tmp )
+        prefilters.each do |f| 
+            tmp=f.run( tmp )
         end
         text <<= tmp
 
@@ -35,7 +39,7 @@ task :compile do
         tmp=Kramdown::Document.new(text).to_latex
 
         # post filters
-        filters.each{ |f| tmp=f.postfilter(tmp) }
+        postfilters.each{ |f| tmp=f.run(tmp) }
 
         # write 
         # create tex associated to md

filters/markdown_macros.rb

@@ -32,22 +32,18 @@ class MarkdownMacros
         end
     end
 
-    def prefilter( content )
+    def run (content)
         content.gsub(/%%% (\w*) %%% ((.|\n)*?) %%%/m) do |m| 
-            puts %{  macro %#{$1}\t=> #{$2}}
+            puts %{  mkd macro %#{$1}\t=> #{$2}}
             @macro[$1.intern]=$2
             ""
-        end
-    end
-
-    def postfilter(content)
-        content.gsub(/((\\textbackslash\{\})?)\\%(\w*)/) do |m| 
-            puts "MATCH: 1. #{$1} 2. #{$2} 3. #{$3}"
+        end.gsub(/((\\)?)%(\w*)/) do |m| 
+            puts " mkd macro MATCH: 1. #{$1} 2. #{$2} 3. #{$3}"
             if $3 != "" 
                 if $1 == ""
                     macro_value_for($3)
                 else
-                    "\\texttt{\\%#{$3}}"
+                    '`%'+$3+'`'
                 end
             else
                 m

filters/mkd_post_latex_macros.rb

@@ -0,0 +1,60 @@
+# Add macros to Markdown
+#
+# Here is a %test.
+#
+# you could add a macro like this
+#
+# filter.macro={
+#   :latex => %{\LaTeX}
+# }
+#
+# or within the markdown file by
+#
+# %%% macro_name %%% macro_value %%%
+#
+
+class MarkdownPostLatexMacros
+    attr_accessor :macro
+    def initialize()
+        super
+        @macro={}
+    end
+
+    def macro_value_for(ident)
+        return '%' if ident.nil? or ident==""
+        ident=ident.intern
+        return %{%#{ident}} if @macro[ident].nil?
+
+        if @macro[ident] =~ /ruby: ((.|n)*)/m
+            return eval $1
+        else
+            return @macro[ident]
+        end
+    end
+
+    def run (content)
+        content.gsub(/LLL (\w*) LLL ((.|\n)*?) LLL/m) do |m| 
+            name=$1
+            value=$2
+            puts %{  ltx macro %#{name}\t=> #{value}}
+            value=value.gsub(/\\textbackslash\{\}/,'\\').
+                gsub(/\\%/,'%').
+                gsub(/\\\{/,'{').
+                gsub(/\\\}/,'}')
+            puts %{  ltx macro %#{name}\t=> #{value}}
+            @macro[name.intern]=value
+            ""
+        end.gsub(/((\\textbackslash\{\})?)\\%(\w*)/) do |m| 
+            puts "  ltx macro MATCH: 1. #{$1} 2. #{$2} 3. #{$3}"
+            if $3 != "" 
+                if $1 == ""
+                    macro_value_for($3)
+                else
+                    %{\texttt{%#{$3}}}
+                end
+            else
+                m
+            end
+        end
+    end
+end