PLT-394: Add a /me command

- Just italicizes the message to mark it as 'action'
- Same behavior as slack
- Is super useful for people moving from IRC, since /me is often
  burnt into muscle memory

api/command.go

@@ -24,6 +24,7 @@ var (
 		"loadTestCommand": "/loadtest",
 		"echoCommand":     "/echo",
 		"shrugCommand":    "/shrug",
+		"meCommand":       "/me",
 	}
 	commands = []commandHandler{
 		logoutCommand,
@@ -31,6 +32,7 @@ var (
 		loadTestCommand,
 		echoCommand,
 		shrugCommand,
+		meCommand,
 	}
 	commandNotImplementedErr = model.NewAppError("checkCommand", "Command not implemented", "")
 )
@@ -194,6 +196,34 @@ func echoCommand(c *Context, command *model.Command) bool {
 	return false
 }
 
+func meCommand(c *Context, command *model.Command) bool {
+	cmd := cmds["meCommand"]
+
+	if !command.Suggest && strings.Index(command.Command, cmd) == 0 {
+		message := ""
+
+		parameters := strings.SplitN(command.Command, " ", 2)
+		if len(parameters) > 1 {
+			message += "*" + parameters[1] + "*"
+		}
+
+		post := &model.Post{}
+		post.Message = message
+		post.ChannelId = command.ChannelId
+		if _, err := CreatePost(c, post, false); err != nil {
+			l4g.Error("Unable to create /me post post, err=%v", err)
+			return false
+		}
+		command.Response = model.RESP_EXECUTED
+		return true
+
+	} else if strings.Index(cmd, command.Command) == 0 {
+		command.AddSuggestion(&model.SuggestCommand{Suggestion: cmd, Description: "Do an action, /me [message]"})
+	}
+
+	return false
+}
+
 func shrugCommand(c *Context, command *model.Command) bool {
 	cmd := cmds["shrugCommand"]