chore(example): add some examples (#25)

.gitignore

@@ -15,5 +15,4 @@
 vendor/
 .idea
 _backup
-_example
 .todo

_example/entry/context/main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/flc1125/go-cron/v4"
+)
+
+func main() {
+	c := cron.New(
+		cron.WithSeconds(),
+	)
+
+	_, _ = c.AddFunc("* * * * * *", func(ctx context.Context) error {
+		entry, ok := cron.EntryFromContext(ctx)
+		if ok {
+			log.Println(fmt.Sprintf("entry id: %d", entry.ID))
+		}
+		return nil
+	})
+
+	c.Start()
+	defer c.Stop()
+
+	time.Sleep(5 * time.Second)
+}

middleware/recovery/example_test.go → _example/middleware/recovery/main.go

@@ -1,20 +1,23 @@
-package recovery_test
+package main
 
 import (
 	"context"
+	"time"
 
 	"github.com/flc1125/go-cron/v4"
 	"github.com/flc1125/go-cron/v4/middleware/recovery"
 )
 
-func Example() {
+func main() {
 	c := cron.New()
 	c.Use(recovery.New())
 
-	_, _ = c.AddFunc("* * * * * ?", func(context.Context) error {
+	_, _ = c.AddFunc("* * * * * *", func(context.Context) error {
 		panic("YOLO")
 	})
 
 	c.Start()
 	defer c.Stop()
+
+	time.Sleep(2 * time.Second)
 }

middleware/recovery/README.md

@@ -5,24 +5,27 @@ The `recovery` middleware is a middleware for [go-cron](https://github.com/flc11
 ## Usage
 
 ```go
-package recovery_test
+package main
 
 import (
 	"context"
+	"time"
 
 	"github.com/flc1125/go-cron/v4"
 	"github.com/flc1125/go-cron/v4/middleware/recovery"
 )
 
-func Example() {
+func main() {
 	c := cron.New()
 	c.Use(recovery.New())
 
-	c.AddFunc("* * * * * ?", func(ctx context.Context) error {
+	_, _ = c.AddFunc("* * * * * *", func(context.Context) error {
 		panic("YOLO")
 	})
 
 	c.Start()
 	defer c.Stop()
+
+	time.Sleep(2 * time.Second)
 }
 ```