tab-completion: added support for tab completion

lib/feature/tab.rb

@@ -0,0 +1,32 @@
+require_relative './base'
+
+module Feature
+
+  class Tab < Feature::Base
+    def valid?
+      argv.size > 0
+    end
+
+    def help
+      puts
+      puts "USAGE: feature tab [pattern]"
+      puts
+      exit
+    end
+
+    def execute
+      if argv.size == 1
+        pattern = '.+'
+      else
+        pattern = "^#{argv[1]}"
+      end
+
+      regexp = Regexp.new(pattern)
+      cmds = Feature::Commander.tab_completion
+      cmds = cmds.select { |x| regexp.match(x) }
+
+      puts cmds.join("\n")
+    end
+  end
+
+end