perf(pr,issue): load the interactive create form data concurrently

Signed-off-by: bircni <bircni@icloud.com>

internal/services/pull_create_selectables.go

@@ -23,30 +23,77 @@ func (s Pulls) CreateSelectables(ctx context.Context) (CreateSelectables, error)
 	return loadCreateSelectables(ctx, s.Client, s.Repository)
 }
 
+// PullCreateChoices seed the interactive create form: the repository, its pull request template
+// on the default branch, and the metadata selectables.
+type PullCreateChoices struct {
+	Repository Repository
+	Template   string
+	CreateSelectables
+}
+
+// CreateChoices fetches the repository once for its default branch and permissions, then loads
+// the pull request template and the selectables concurrently.
+func (s Pulls) CreateChoices(ctx context.Context) (PullCreateChoices, error) {
+	item, err := (Repositories{Client: s.Client}).get(ctx, s.Repository)
+	if err != nil {
+		return PullCreateChoices{}, err
+	}
+	result := PullCreateChoices{Repository: repositoryFrom(item)}
+	err = loadTogether(
+		func() (err error) {
+			result.Template, err = s.Template(ctx, result.Repository.DefaultBranch)
+			return err
+		},
+		func() (err error) {
+			result.CreateSelectables, err = createSelectablesFor(ctx, s.Client, s.Repository, permissionsFrom(item).Push)
+			return err
+		},
+	)
+	if err != nil {
+		return PullCreateChoices{}, err
+	}
+	return result, nil
+}
+
 func loadCreateSelectables(ctx context.Context, client *transport.Client, repository string) (CreateSelectables, error) {
-	result := CreateSelectables{Assignees: []string{}, Milestones: []Milestone{}, Labels: []Label{}}
 	permissions, err := (Repositories{Client: client}).viewPermissions(ctx, repository)
-	if err != nil || !permissions.Push {
-		return result, err
+	if err != nil {
+		return CreateSelectables{Assignees: []string{}, Milestones: []Milestone{}, Labels: []Label{}}, err
+	}
+	return createSelectablesFor(ctx, client, repository, permissions.Push)
+}
+
+// createSelectablesFor loads assignees, milestones, and labels concurrently when canPush.
+func createSelectablesFor(ctx context.Context, client *transport.Client, repository string, canPush bool) (CreateSelectables, error) {
+	result := CreateSelectables{Assignees: []string{}, Milestones: []Milestone{}, Labels: []Label{}}
+	if !canPush {
+		return result, nil
 	}
 	result.CanPush = true
-	if result.Assignees, err = (Repositories{Client: client}).assignees(ctx, repository); err != nil {
-		return result, err
-	}
-	if result.Milestones, err = listAll(func(page int) ([]Milestone, error) {
-		return (Milestones{Client: client, Repository: repository}).List(ctx, "open", 100, page)
-	}); err != nil {
-		return result, err
-	}
-	if result.Labels, err = (Labels{Client: client, Repository: repository}).All(ctx); err != nil {
-		return result, err
-	}
-	// Like --label, offer the labels shared by the organization that owns the repository.
-	owner, _, _ := strings.Cut(repository, "/")
-	if _, isOrg, err := organization(ctx, client, owner); err != nil || !isOrg {
-		return result, err
-	}
-	orgLabels, err := (Labels{Client: client, Organization: owner}).All(ctx)
-	result.Labels = append(result.Labels, orgLabels...)
+	err := loadTogether(
+		func() (err error) {
+			result.Assignees, err = (Repositories{Client: client}).assignees(ctx, repository)
+			return err
+		},
+		func() (err error) {
+			result.Milestones, err = listAll(func(page int) ([]Milestone, error) {
+				return (Milestones{Client: client, Repository: repository}).List(ctx, "open", 100, page)
+			})
+			return err
+		},
+		func() (err error) {
+			if result.Labels, err = (Labels{Client: client, Repository: repository}).All(ctx); err != nil {
+				return err
+			}
+			// Like --label, offer the labels shared by the organization that owns the repository.
+			owner, _, _ := strings.Cut(repository, "/")
+			if _, isOrg, err := organization(ctx, client, owner); err != nil || !isOrg {
+				return err
+			}
+			orgLabels, err := (Labels{Client: client, Organization: owner}).All(ctx)
+			result.Labels = append(result.Labels, orgLabels...)
+			return err
+		},
+	)
 	return result, err
 }