Initial commit of MoinMoin2Markdown transformation

This is going to be a 80/20 solution for the
migration of the CouchDB wiki pages from the
MoinMoin-Syntax to Markdown.

bin/mm2md.rb

@@ -0,0 +1,73 @@
+require "rubygems"
+
+input = IO.readlines('../wiki/HTTP_database_API.mm','').to_s
+
+def substitute_pattern_in_string_with(pattern, string)
+   string.scan(pattern).flatten.inject({}) do |acc, matched|
+     acc[matched] = yield matched
+     acc
+   end.each do |matched, substitute|
+     string.gsub!(matched, substitute)
+   end
+
+   return string
+end
+
+transformations = [
+    { :regexp => /=+\s*?$/,                    :replacement => '' },        # headlines
+
+    # { :regexp => /^(?:(\{\{\{)|(\}\}\}))\s*?$/,:replacement => '....' },    # blocks (extra line)
+    { :regexp => /\{\{\{(.*?)\}\}\}/,       :replacement => '`\1`' },       # blocks (inline)
+
+    { :regexp => /'''([^']+)'''/,              :replacement => '**\1**' },  # bold
+    { :regexp => /''([^']+)''/,                :replacement => '*\1*' },    # italic
+
+    { :regexp => /_\_(\S)/,                    :replacement => '_\_\1' },   # escaping (italic)
+
+    { :regexp => /<<TableOfContents\(.\)>>/,   :replacement => '' }         # drop some stuff
+  ]
+
+# do the basic stuff 
+output = transformations.inject(input) do |txt, pattern|
+  txt.gsub(pattern[:regexp], pattern[:replacement])
+end
+
+# transform headlines
+output = substitute_pattern_in_string_with(/^=+/, output) do |matched_string|
+  "#" * matched_string.length
+end
+
+# doing blocks
+output = substitute_pattern_in_string_with(/\{\{\{.*?\}\}\}/m, output) do |matched_block|
+  block = matched_block.split("\n")
+  block.shift
+  block.pop
+  "\n" << block.each.inject("") do |acc, line|
+    acc << "    " << line << "\n"
+  end
+
+end
+
+puts output
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