find a draft release before creating new one

cli.go

@@ -15,6 +15,7 @@ import (
 
 	"github.com/google/go-github/v47/github"
 	"github.com/mitchellh/colorstring"
+	"github.com/pkg/errors"
 	"github.com/tcnksm/go-gitconfig"
 )
 
@@ -294,17 +295,24 @@ func (cli *CLI) Run(args []string) int {
 			return ExitCodeOK
 		}
 
-		if err != nil && err != ErrReleaseNotFound {
+		if !errors.Is(err, ErrReleaseNotFound) {
 			PrintRedf(cli.errStream, "Failed to get GitHub release: %s\n", err)
 			return ExitCodeError
 		}
 	}
 
-	release, err := ghr.CreateRelease(ctx, req, recreate)
+	release, err := ghr.GitHub.GetDraftRelease(ctx, tag)
 	if err != nil {
-		PrintRedf(cli.errStream, "Failed to create GitHub release page: %s\n", err)
+		PrintRedf(cli.errStream, "Failed to get draft release: %s\n", err)
 		return ExitCodeError
 	}
+	if release == nil {
+		release, err = ghr.CreateRelease(ctx, req, recreate)
+		if err != nil {
+			PrintRedf(cli.errStream, "Failed to create GitHub release page: %s\n", err)
+			return ExitCodeError
+		}
+	}
 
 	if replace {
 		err := ghr.DeleteAssets(ctx, *release.ID, localAssets, parallel)

ghr.go

@@ -38,7 +38,7 @@ func (g *GHR) CreateRelease(ctx context.Context, req *github.RepositoryRelease,
 	// If release is not found, then create a new release.
 	release, err := g.GitHub.GetRelease(ctx, *req.TagName)
 	if err != nil {
-		if err != ErrReleaseNotFound {
+		if !errors.Is(err, ErrReleaseNotFound) {
 			return nil, errors.Wrap(err, "failed to get release")
 		}
 		Debugf("Release (with tag %s) not found: create a new one",

github.go

@@ -26,6 +26,7 @@ var (
 type GitHub interface {
 	CreateRelease(ctx context.Context, req *github.RepositoryRelease) (*github.RepositoryRelease, error)
 	GetRelease(ctx context.Context, tag string) (*github.RepositoryRelease, error)
+	GetDraftRelease(ctx context.Context, tag string) (*github.RepositoryRelease, error)
 	EditRelease(ctx context.Context, releaseID int64, req *github.RepositoryRelease) (*github.RepositoryRelease, error)
 	DeleteRelease(ctx context.Context, releaseID int64) error
 	DeleteTag(ctx context.Context, tag string) error
@@ -129,6 +130,36 @@ func (c *GitHubClient) GetRelease(ctx context.Context, tag string) (*github.Repo
 	return release, nil
 }
 
+func (c *GitHubClient) GetDraftRelease(ctx context.Context, tag string) (*github.RepositoryRelease, error) {
+	const perPage = 100
+	for page := 1; page <= 2; page++ {
+		releases, res, err := c.Repositories.ListReleases(ctx, c.Owner, c.Repo, &github.ListOptions{
+			PerPage: perPage,
+			Page:    page,
+		})
+		if err != nil {
+			if res == nil {
+				return nil, errors.Wrapf(err, "failed to get releases while getting draft release for: %s", tag)
+			}
+			// TODO(tcnksm): Handle invalid token
+			if res.StatusCode != http.StatusNotFound {
+				return nil, errors.Wrapf(err,
+					"get release tag: invalid status: %s", res.Status)
+			}
+			return nil, ErrReleaseNotFound
+		}
+		for _, rel := range releases {
+			if *rel.Draft && *rel.TagName == tag {
+				return rel, nil
+			}
+		}
+		if len(releases) < perPage {
+			break
+		}
+	}
+	return nil, nil
+}
+
 // EditRelease edit a release object within the GitHub API
 func (c *GitHubClient) EditRelease(ctx context.Context, releaseID int64, req *github.RepositoryRelease) (*github.RepositoryRelease, error) {
 	var release *github.RepositoryRelease