add a cool lua repl

lib/lua-repl/repl/plugins/linenoise.lua

@@ -0,0 +1,59 @@
+-- Copyright (c) 2011-2015 Rob Hoelz <rob@hoelz.ro>
+--
+-- Permission is hereby granted, free of charge, to any person obtaining a copy of
+-- this software and associated documentation files (the "Software"), to deal in
+-- the Software without restriction, including without limitation the rights to
+-- use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+-- the Software, and to permit persons to whom the Software is furnished to do so,
+-- subject to the following conditions:
+--
+-- The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+-- FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+-- COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+-- IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+-- CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+-- A plugin that uses linenoise (https://github.com/hoelzro/lua-linenoise) for prompting
+
+local ln = require 'linenoise'
+
+repl:requirefeature 'console'
+
+function override:showprompt(prompt)
+  self._prompt = prompt -- XXX how do we make sure other plugins don't step on this?
+end
+
+function override:lines()
+  return function()
+    return ln.linenoise(self._prompt .. ' ')
+  end
+end
+
+repl:iffeature('completion', function()
+  ln.setcompletion(function(completions, line)
+    repl:complete(line, function(completion)
+      ln.addcompletion(completions, completion)
+    end)
+  end)
+end)
+
+repl:ifplugin('history', function()
+  repl:setuphistorycallbacks {
+    load = function(filename)
+      ln.historyload(filename)
+    end,
+
+    addline = function(line)
+      ln.historyadd(line)
+    end,
+
+    save = function(filename)
+      ln.historysave(filename)
+    end,
+  }
+end)
+
+features = 'input'