Generate normal mode reference

Parse entries out of the cmds array in normal.cc, then generate a
sorted list of key bindings as an HTML table.

contrib/kakmap.rb

@@ -0,0 +1,61 @@
+#!/usr/bin/env ruby
+
+# Generate a reference sheet for Kakoune's normal mode
+# Use: ./kakmap.rb ../src/normal.cc
+
+require 'markaby'
+
+# Relies on the cmds array assignment ending with };
+raw = ARGF.read.split( /cmds\[\] =\s+{\s*/m ).last.split( /^};$/ ).first
+
+commands = {}
+
+# break code into lines
+raw.split( /\n+/ ).each{ |line|
+  line.gsub!( /(^\s*{\s*|\s*},?\*$)/, '' ) # discard wrapping for array elements
+
+  mod = (line.scan( /^alt|^ctrl/ ).first || 'none').to_sym
+  key = line.scan(/(?:^Key::(\w+)|(?<!\\)'\\?(.*?)(?<!\\)')/).flatten.compact.first
+  des = line.scan(/(?<!\\)"(?<desc>.*?)(?<!\\)"/).flatten.first
+
+  key = 'Space' if key == ' '
+
+  commands[key] ||= {}
+  commands[key][mod] = des
+}
+
+# sort, showing single characters first, symbols next and spelled out keys last
+commands = commands.sort_by{ |key, _|
+  case key
+  when /^\w$/
+    key.upcase + key.swapcase
+  when /^\W$/
+    '_' + key
+  else
+    '~~' + key
+  end
+}
+
+puts Markaby::Builder.new {
+  table do
+    thead do
+      tr do
+        th "Key"
+        th "Description"
+        th "ALT + key"
+        th "CTRL + key"
+      end
+    end
+    tbody do
+      for key, binding in commands
+        tr do
+          th key
+          td binding[:none]
+          td binding[:alt]
+          td binding[:ctrl]
+        end
+      end
+    end
+  end
+}
+