Add processing when pagination is nil

mastodon.go

@@ -103,19 +103,18 @@ func (c *Client) doAPI(ctx context.Context, method string, uri string, params in
 	}
 	defer resp.Body.Close()
 
-	lh := resp.Header.Get("Link")
-	if lh != "" {
-		retPG, err := newPagination(lh)
-		if err != nil {
-			return err
-		}
-		*pg = *retPG
-	}
-
 	if resp.StatusCode != http.StatusOK {
 		return parseAPIError("bad request", resp)
 	} else if res == nil {
 		return nil
+	} else if pg != nil {
+		if lh := resp.Header.Get("Link"); lh != "" {
+			pg2, err := newPagination(lh)
+			if err != nil {
+				return err
+			}
+			*pg = *pg2
+		}
 	}
 	return json.NewDecoder(resp.Body).Decode(&res)
 }

mastodon_test.go

@@ -13,24 +13,24 @@ import (
 
 func TestDoAPI(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		q := r.URL.Query()
-		if q.Get("max_id") == "123" && q.Get("since_id") == "789" && q.Get("limit") == "10" {
+		if r.URL.Query().Get("max_id") == "999" {
+			w.Header().Set("Link", `<:>; rel="next"`)
+		} else {
 			w.Header().Set("Link", `<http://example.com?max_id=234>; rel="next", <http://example.com?since_id=890>; rel="prev"`)
-			fmt.Fprintln(w, `[{"username": "foo"}, {"username": "bar"}]`)
 		}
-		w.Header().Set("Link", `<:>; rel="next"`)
+		fmt.Fprintln(w, `[{"username": "foo"}, {"username": "bar"}]`)
 	}))
 	defer ts.Close()
 
 	c := NewClient(&Config{Server: ts.URL})
-	err := c.doAPI(context.Background(), http.MethodGet, "/", nil, nil, &Pagination{
+	var accounts []Account
+	err := c.doAPI(context.Background(), http.MethodGet, "/", nil, &accounts, &Pagination{
 		MaxID: Int64(999),
 	})
 	if err == nil {
 		t.Fatalf("should be fail: %v", err)
 	}
 
-	var accounts []Account
 	pg := &Pagination{
 		MaxID:   Int64(123),
 		SinceID: Int64(789),
@@ -74,6 +74,18 @@ func TestDoAPI(t *testing.T) {
 	if accounts[1].Username != "bar" {
 		t.Fatalf("want %q but %q", "bar", accounts[1].Username)
 	}
+
+	// *Pagination is nil
+	err = c.doAPI(context.Background(), http.MethodGet, "/", nil, &accounts, nil)
+	if err != nil {
+		t.Fatalf("should not be fail: %v", err)
+	}
+	if accounts[0].Username != "foo" {
+		t.Fatalf("want %q but %q", "foo", accounts[0].Username)
+	}
+	if accounts[1].Username != "bar" {
+		t.Fatalf("want %q but %q", "bar", accounts[1].Username)
+	}
 }
 
 func TestAuthenticate(t *testing.T) {