From ea2e86e3983046d824c2a4c6b72ebee42502cc2a Mon Sep 17 00:00:00 2001
From: Sascha Andres <s.andres@syzygy.de>
Date: Thu, 2 Mar 2017 09:38:23 +0100
Subject: [PATCH] Simple cyclic dependency detection

---
 task.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/task.go b/task.go
index ceb70e5f..e0eab8db 100644
--- a/task.go
+++ b/task.go
@@ -23,6 +23,8 @@ var (
 
 	// Tasks constains the tasks parsed from Taskfile
 	Tasks = make(map[string]*Task)
+
+	runTasks = make(map[string]bool)
 )
 
 func init() {
@@ -84,6 +86,11 @@ func Run() {
 
 // RunTask runs a task by its name
 func RunTask(name string) error {
+	if _, found := runTasks[name]; found {
+		return &taskRunError{taskName: name, err: fmt.Errorf("Cyclic dependency detected")}
+	}
+	runTasks[name] = true
+
 	t, ok := Tasks[name]
 	if !ok {
 		return &taskNotFoundError{name}