Fix bug of Task not executing the "default" task

When global vars were informed using the CLI.

I took the oportunity to move this logic to the proper package and
write a test.

CHANGELOG.md

@@ -5,6 +5,8 @@
 - Add `--parallel` flag (alias `-p`) to run tasks given by the command line in
   parallel
   ([#266](https://github.com/go-task/task/pull/266)).
+- Fixed bug where calling the `task` CLI only informing global vars would not
+  execute the `default` task.
 
 ## v2.7.1 - 2019-11-10
 

cmd/task/task.go

@@ -133,13 +133,7 @@ func main() {
 		return
 	}
 
-	arguments := pflag.Args()
-	if len(arguments) == 0 {
-		log.Println("task: No argument given, trying default task")
-		arguments = []string{"default"}
-	}
-
-	calls, globals := args.Parse(arguments...)
+	calls, globals := args.Parse(pflag.Args()...)
 	for name, value := range globals {
 		e.Taskfile.Vars[name] = value
 	}

internal/args/args.go

@@ -34,6 +34,10 @@ func Parse(args ...string) ([]taskfile.Call, taskfile.Vars) {
 		}
 	}
 
+	if len(calls) == 0 {
+		calls = append(calls, taskfile.Call{Task: "default"})
+	}
+
 	return calls, globals
 }
 

internal/args/args_test.go

@@ -64,6 +64,16 @@ func TestArgs(t *testing.T) {
 				"FOO": {Static: "bar"},
 			},
 		},
+		{
+			Args: []string{"FOO=bar", "BAR=baz"},
+			ExpectedCalls: []taskfile.Call{
+				{Task: "default"},
+			},
+			ExpectedGlobals: taskfile.Vars{
+				"FOO": {Static: "bar"},
+				"BAR": {Static: "baz"},
+			},
+		},
 	}
 
 	for i, test := range tests {