add a cool lua repl

lib/lua-repl/repl/plugins/history.lua

@@ -0,0 +1,60 @@
+-- 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.
+
+local history_file
+
+local function invokecallback(self, name, ...)
+  if not self._history_callbacks then
+    return
+  end
+
+  local impl = self._history_callbacks[name]
+  return impl(...)
+end
+
+local function init()
+  if os.getenv 'HOME' then
+    history_file = os.getenv('HOME') .. '/.rep.lua.history'
+  end
+end
+
+-- XXX I don't know if this callback setup way
+--     is the best way to go about this (in fact
+--     I'm pretty sure it isn't), but I just need
+--     something that works right now.
+function repl:setuphistorycallbacks(callbacks)
+  self._history_callbacks = callbacks
+
+  if history_file then
+    invokecallback(self, 'load', history_file)
+  end
+end
+
+function after:handleline(line)
+  invokecallback(self, 'addline', line)
+end
+
+function before:shutdown()
+  if history_file then
+    invokecallback(self, 'save', history_file)
+  end
+end
+
+features = 'history'
+
+init()