Add label support

README.md

@@ -25,6 +25,8 @@ File in the extended format should follow the specification:
 <!-- Parent: <parent 2> -->
 <!-- Title: <title> -->
 <!-- Attachment: <local path> -->
+<!-- Label: <label 1> -->
+<!-- Label: <label 2> -->
 
 <page contents>
 ```

main.go

@@ -240,7 +240,7 @@ func main() {
 		html = buffer.String()
 	}
 
-	err = api.UpdatePage(target, html)
+	err = api.UpdatePage(target, html, meta.Labels)
 	if err != nil {
 		log.Fatal(err)
 	}

pkg/confluence/api.go

@@ -434,7 +434,7 @@ func (api *API) CreatePage(
 }
 
 func (api *API) UpdatePage(
-	page *PageInfo, newContent string,
+	page *PageInfo, newContent string, newLabels []string,
 ) error {
 	nextPageVersion := page.Version.Number + 1
 
@@ -450,6 +450,17 @@ func (api *API) UpdatePage(
 		{"id": page.Ancestors[len(page.Ancestors)-1].Id},
 	}
 
+	labels := []map[string]interface{}{}
+	for _, label := range newLabels {
+		if label != "" {
+			item := map[string]interface{}{
+				"prexix": "global",
+				"name":   label,
+			}
+			labels = append(labels, item)
+		}
+	}
+
 	payload := map[string]interface{}{
 		"id":    page.ID,
 		"type":  "page",
@@ -465,6 +476,9 @@ func (api *API) UpdatePage(
 				"representation": "storage",
 			},
 		},
+		"metadata": map[string]interface{}{
+			"labels": labels,
+		},
 	}
 
 	request, err := api.rest.Res(

pkg/mark/meta.go

@@ -16,6 +16,7 @@ const (
 	HeaderTitle      = `Title`
 	HeaderLayout     = `Layout`
 	HeaderAttachment = `Attachment`
+	HeaderLabel      = `Label`
 )
 
 type Meta struct {
@@ -24,6 +25,7 @@ type Meta struct {
 	Title       string
 	Layout      string
 	Attachments map[string]string
+	Labels      []string
 }
 
 var (
@@ -90,6 +92,9 @@ func ExtractMeta(data []byte) (*Meta, []byte, error) {
 		case HeaderAttachment:
 			meta.Attachments[value] = value
 
+		case HeaderLabel:
+			meta.Labels = append(meta.Labels, value)
+
 		default:
 			log.Errorf(
 				nil,