Fix a small issue with the `ListUserProjects`

A user can be either an ID or a name.

README.md

@@ -16,29 +16,29 @@ incompatible changes that were needed to fully support the V4 Gitlab API.
 This API client package covers **100%** of the existing GitLab API calls! So this
 includes all calls to the following services:
 
-- [x] Users
-- [x] Session
-- [x] Projects (including setting Webhooks)
-- [x] Project Snippets
-- [x] Services
-- [x] Repositories
-- [x] Repository Files
-- [x] Commits
 - [x] Branches
-- [x] Merge Requests
+- [x] Commits
+- [x] Deploy Keys
+- [x] Environments
+- [x] Groups
 - [x] Issues
 - [x] Labels
+- [x] Merge Requests
 - [x] Milestones
-- [x] Notes (comments)
-- [x] Deploy Keys
-- [x] System Hooks
-- [x] Groups
 - [x] Namespaces
-- [x] Settings
+- [x] Notes (comments)
 - [x] Pipelines
+- [x] Project Snippets
+- [x] Projects (including setting Webhooks)
+- [x] Repositories
+- [x] Repository Files
+- [x] Services
+- [x] Session
+- [x] Settings
+- [x] System Hooks
+- [x] Users
 - [x] Version
 - [x] Wikis
-- [x] Environments
 
 ## Usage
 

gitlab.go

@@ -551,16 +551,12 @@ type OptionFunc func(*http.Request) error
 // WithSudo takes either a username or user ID and sets the SUDO request header
 func WithSudo(uid interface{}) OptionFunc {
 	return func(req *http.Request) error {
-		switch uid := uid.(type) {
-		case int:
-			req.Header.Set("SUDO", strconv.Itoa(uid))
-			return nil
-		case string:
-			req.Header.Set("SUDO", uid)
-			return nil
-		default:
-			return fmt.Errorf("uid must be either a username or user ID")
+		user, err := parseID(uid)
+		if err != nil {
+			return err
 		}
+		req.Header.Set("SUDO", user)
+		return nil
 	}
 }
 

projects.go

@@ -199,10 +199,15 @@ func (s *ProjectsService) ListProjects(opt *ListProjectsOptions, options ...Opti
 
 // ListUserProjects gets a list of projects for the given user.
 //
-// GitLab API docs: https://docs.gitlab.com/ee/api/projects.html#list-user-projects
-func (s *ProjectsService) ListUserProjects(user int, opt *ListProjectsOptions, options ...OptionFunc) ([]*Project, *Response, error) {
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/projects.html#list-user-projects
+func (s *ProjectsService) ListUserProjects(uid interface{}, opt *ListProjectsOptions, options ...OptionFunc) ([]*Project, *Response, error) {
+	user, err := parseID(uid)
+	if err != nil {
+		return nil, nil, err
+	}
+	u := fmt.Sprintf("users/%s/projects", user)
 
-	u := fmt.Sprintf("users/%d/projects", user)
 	req, err := s.client.NewRequest("GET", u, opt, options)
 	if err != nil {
 		return nil, nil, err