fix: taskfile directory (#1530)

* fix: taskfile directory

* tests: add tests for special vars when running from a subdirectory

taskfile/node.go

@@ -24,6 +24,7 @@ func NewRootNode(
 	entrypoint string,
 	insecure bool,
 ) (Node, error) {
+	dir = getDefaultDir(entrypoint, dir)
 	// Check if there is something to read on STDIN
 	stat, _ := os.Stdin.Stat()
 	if (stat.Mode()&os.ModeCharDevice) == 0 && stat.Size() > 0 {
@@ -68,3 +69,26 @@ func getScheme(uri string) string {
 	}
 	return ""
 }
+
+func getDefaultDir(entrypoint, dir string) string {
+	// If the entrypoint and dir are empty, we default the directory to the current working directory
+	if dir == "" {
+		if entrypoint == "" {
+			wd, err := os.Getwd()
+			if err != nil {
+				return ""
+			}
+			dir = wd
+		}
+		return dir
+	}
+
+	// If the directory is set, ensure it is an absolute path
+	var err error
+	dir, err = filepath.Abs(dir)
+	if err != nil {
+		return ""
+	}
+
+	return dir
+}