updated rechner.lua

.gitignore

@@ -38,3 +38,4 @@ plugins/vimeo.lua
 plugins/vine.lua
 plugins/youtube_playlist.lua
 plugins/yandere.lua
+plugins/e621.lua

plugins/boersedown.lua

@@ -3,7 +3,7 @@ socket = require("socket")
 function cron()
 	-- Use yours desired web and id
 	local addr = "www.boerse.to"
-	local dest = "chat#id12345678"
+	local dest = "chat#id21091846"
     -- Checks a TCP connexion
     local connexion = socket.connect(addr, 80)
     if not connexion then 

plugins/rechner.lua

@@ -1,7 +1,24 @@
-function run(msg, matches)
-  -- Convert expression to a function and execute it
-  local expression = string.gsub(matches[1], "(%a+)", "math.%1")
-  return load('return '..expression)()
+-- Function reference: http://mathjs.org/docs/reference/functions/categorical.html
+
+local function mathjs(exp)
+  local url = 'http://api.mathjs.org/v1/'
+  url = url..'?expr='..URL.escape(exp)
+  local b,c = http.request(url)
+  local text = nil
+  if c == 200 then
+    text = 'Das Ergebnis ist '..b
+  
+  elseif c == 400 then
+    text = b
+  else
+    text = 'Unexpected error\n'
+      ..'Is api.mathjs.org up?'
+  end
+  return text
+end
+
+local function run(msg, matches)
+  return mathjs(matches[1])
 end
 
 return {