Add support for 'platforms' in both task and command (#980)

task.go

@@ -135,6 +135,13 @@ func (e *Executor) RunTask(ctx context.Context, call taskfile.Call) error {
 	defer release()
 
 	return e.startExecution(ctx, t, func(ctx context.Context) error {
+
+		// Check platform
+		if !ShouldRunOnCurrentPlatform(t.Platforms) {
+			e.Logger.VerboseOutf(logger.Yellow, `task: "%s" not for current platform - ignored`, call.Task)
+			return nil
+		}
+
 		e.Logger.VerboseErrf(logger.Magenta, `task: "%s" started`, call.Task)
 		if err := e.runDeps(ctx, t); err != nil {
 			return err
@@ -252,6 +259,11 @@ func (e *Executor) runCommand(ctx context.Context, t *taskfile.Task, call taskfi
 		}
 		return nil
 	case cmd.Cmd != "":
+		// Check platform
+		if !ShouldRunOnCurrentPlatform(cmd.Platforms) {
+			e.Logger.VerboseOutf(logger.Yellow, `task: [%s] %s not for current platform - ignored`, t.Name(), cmd.Cmd)
+			return nil
+		}
 		if e.Verbose || (!cmd.Silent && !t.Silent && !e.Taskfile.Silent && !e.Silent) {
 			e.Logger.Errf(logger.Green, "task: [%s] %s", t.Name(), cmd.Cmd)
 		}
@@ -455,3 +467,15 @@ func FilterOutInternal() FilterFunc {
 		return task.Internal
 	})
 }
+
+func ShouldRunOnCurrentPlatform(platforms []*taskfile.Platform) bool {
+	if len(platforms) == 0 {
+		return true
+	}
+	for _, platform := range platforms {
+		if platform.MatchesCurrentPlatform() {
+			return true
+		}
+	}
+	return false
+}