Merge pull request #1075 from flaviut/inlinedocs

Add some documentations and code examples in system

tests/misc/teventemitter.nim

@@ -0,0 +1,33 @@
+discard """
+  output: "pie"
+"""
+
+import tables, lists
+
+type
+  TEventArgs = object of TObject
+  TEventEmitter = object of TObject
+    events*: TTable[string, TDoublyLinkedList[proc(e: TEventArgs) {.nimcall.}]]
+
+proc emit*(emitter: TEventEmitter, event: string, args: TEventArgs) =
+  for func in nodes(emitter.events[event]):
+    func.value(args) #call function with args.
+
+proc on*(emitter: var TEventEmitter, event: string, 
+         func: proc(e: TEventArgs) {.nimcall.}) =
+  if not hasKey(emitter.events, event):
+    var list: TDoublyLinkedList[proc(e: TEventArgs) {.nimcall.}]
+    add(emitter.events, event, list) #if not, add it.
+  append(emitter.events.mget(event), func)
+
+proc initEmitter(emitter: var TEventEmitter) =
+  emitter.events = initTable[string, 
+    TDoublyLinkedList[proc(e: TEventArgs) {.nimcall.}]]()
+
+var 
+  ee: TEventEmitter
+  args: TEventArgs
+initEmitter(ee)
+ee.on("print", proc(e: TEventArgs) = echo("pie"))
+ee.emit("print", args)
+