Issue 813. Made watch interval configurable through global setting in Taskfile and through CLI arg.

Separated Taskfile param and Arg flag

task_test.go

@@ -10,6 +10,7 @@ import (
 	"runtime"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 
@@ -1400,3 +1401,63 @@ func TestEvaluateSymlinksInPaths(t *testing.T) {
 	err = os.RemoveAll(dir + "/.task")
 	assert.NoError(t, err)
 }
+
+func TestFileWatcherInterval(t *testing.T) {
+	const dir = "testdata/watcher_interval"
+	expectedOutput := strings.TrimSpace(`
+task: Started watching for tasks: default
+task: [default] echo "Hello, World!"
+Hello, World!
+task: [default] echo "Hello, World!"
+Hello, World!
+	`)
+
+	var buff bytes.Buffer
+	e := &task.Executor{
+		Dir:    dir,
+		Stdout: &buff,
+		Stderr: &buff,
+		Watch:  true,
+	}
+
+	assert.NoError(t, e.Setup())
+	buff.Reset()
+
+	ctx := context.Background()
+	ctx, cancel := context.WithCancel(ctx)
+
+	err := os.MkdirAll(dir+"/src", 0755)
+	assert.NoError(t, err)
+
+	err = os.WriteFile(dir+"/src/a", []byte("test"), 0644)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	go func(ctx context.Context) {
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			default:
+				err := e.Run(ctx, taskfile.Call{Task: "default"})
+				if err != nil {
+					return
+				}
+			}
+		}
+	}(ctx)
+
+	time.Sleep(10 * time.Millisecond)
+	err = os.WriteFile(dir+"/src/a", []byte("test updated"), 0644)
+	if err != nil {
+		t.Fatal(err)
+	}
+	time.Sleep(70 * time.Millisecond)
+	cancel()
+
+	assert.Equal(t, expectedOutput, strings.TrimSpace(buff.String()))
+	buff.Reset()
+	err = os.RemoveAll(dir + "/.task")
+	assert.NoError(t, err)
+}