use print_repl, honor silent, and evaluate user vars for #5; status m…

…essages for #4; still some weirdness for #10

jlkernel/handlers.jl

@@ -1,24 +1,62 @@
+function send_status(state::String)
+    send_ipython(publish, 
+                 Msg([ "status" ],
+                     ["msg_id" => uuid4(),
+                      "username" => "jlkernel",
+                      "session" => uuid4(),
+                      "msg_type" => "status"],
+                     [ "execution_state" => "starting" ]))
+end
+
 function execute_request(socket, msg)
-    user_variables = Dict() # TODO
-    user_expressions = Dict() # TODO
+    println("Executing ", msg.content["code"])
+    global _n
+    if !msg.content["silent"]
+        _n += 1
+    end
+
+    send_status("busy")
+
     result = try 
-        global _n += 1
-        println("Executing ", msg.content["code"])
         eval(parse(msg.content["code"]))
     catch
+        # FIXME
         nothing
     end
+    if msg.content["silent"] || ismatch(r";\s*$", msg.content["code"])
+        result = nothing
+    end
+
+    user_variables = Dict() # TODO
+    user_expressions = Dict() # TODO
+    try
+        for v in msg.content["user_variables"]
+            user_variables[v] = eval(parse(v))
+        end
+        for (v,ex) in msg.content["user_expressions"]
+            user_expressions[v] = eval(parse(ex))
+        end
+    catch
+        # ??
+    end
+
+    send_status("idle")
+
     send_ipython(requests, msg_reply(msg, "execute_reply",
                                      ["status" => "ok",
                                       "execution_count" => _n,
                                       "payload" => [],
                                       "user_variables" => user_variables,
                                       "user_expressions" => user_expressions]))
-    send_ipython(publish, 
-                 msg_pub(msg, "pyout",
-                         ["execution_count" => _n,
-                          "data" => [ "text/plain" => repr(result) ]
-                          ]))
+
+    if result != nothing
+        send_ipython(publish, 
+                     msg_pub(msg, "pyout",
+                             ["execution_count" => _n,
+                              "data" => [ "text/plain" => 
+                                         sprint(repl_show, result) ]
+                              ]))
+    end
 end
 
 const handlers = (String=>Function)[

jlkernel/kernel.jl

@@ -37,6 +37,8 @@ _n = 0
 include("msg.jl")
 include("handlers.jl")
 
+send_status("starting")
+
 # heartbeat (should eventually be forked in a separate thread & use zmq_device)
 @async begin
     while true