gh-pr: Output PR url when the remote branch exists (#15)

Additionally:

- `RepoFinder`: fetch max possible repos per request

cmd/gh-pr/main.go

@@ -312,7 +312,12 @@ func (p *prmaker) create(ctx context.Context) error {
 		_, resp, err := p.gh.Repositories.GetBranch(ctx, p.config.owner, repo.GetName(), p.config.branch)
 		switch err {
 		case nil:
-			fmt.Fprintln(p.stderr, repo.GetFullName(), "The remote branch already exists")
+			pullURL := ""
+			pull, err := p.getPullForBranch(ctx, repo, p.config.branch)
+			if err == nil {
+				pullURL = pull.GetHTMLURL()
+			}
+			fmt.Fprintln(p.stderr, repo.GetFullName(), "The remote branch already exists", pullURL)
 			continue
 		default:
 			if resp != nil && resp.StatusCode != http.StatusNotFound {
@@ -368,7 +373,35 @@ func (p *prmaker) create(ctx context.Context) error {
 	return nil
 }
 
-var errNoChanges = fmt.Errorf("no changes")
+func (p *prmaker) getPullForBranch(ctx context.Context, repo *github.Repository, branch string) (*github.PullRequest, error) {
+	var (
+		pulls []*github.PullRequest
+		resp  *github.Response
+		err   error
+		opts  = &github.PullRequestListOptions{ListOptions: github.ListOptions{PerPage: 100}}
+	)
+	for {
+		pulls, resp, err = p.gh.PullRequests.List(ctx, p.config.owner, repo.GetName(), opts)
+		if err != nil {
+			return nil, fmt.Errorf("%s: can't read pull requests: %s", repo.GetName(), err)
+		}
+
+		for _, pull := range pulls {
+			if pull.GetHead().GetRef() == branch {
+				return pull, nil
+			}
+		}
+
+		if resp.NextPage == 0 {
+			break
+		}
+		opts.Page = resp.NextPage
+	}
+
+	return nil, nil
+}
+
+var errNoChanges = fmt.Errorf("no changes were made")
 
 func (p *prmaker) apply(ctx context.Context, repo *github.Repository, scriptPath string) error {
 	dir, err := ioutil.TempDir("", "gh-pr")

github/repo.go

@@ -62,9 +62,11 @@ func (f *RepoFinder) Find(ctx context.Context, filter RepoFilter) ([]*github.Rep
 	return repos, err
 }
 
+var listOptions = github.ListOptions{PerPage: 100}
+
 func (f *RepoFinder) userRepos(ctx context.Context, filter RepoFilter) ([]*github.Repository, error) {
-	opt := &github.RepositoryListOptions{
-		ListOptions: github.ListOptions{PerPage: 30},
+	opts := &github.RepositoryListOptions{
+		ListOptions: listOptions,
 		Affiliation: "owner",
 	}
 	var (
@@ -73,7 +75,7 @@ func (f *RepoFinder) userRepos(ctx context.Context, filter RepoFilter) ([]*githu
 		err             error
 	)
 	for {
-		repos, resp, err = f.Client.Repositories.List(ctx, filter.Owner, opt)
+		repos, resp, err = f.Client.Repositories.List(ctx, filter.Owner, opts)
 		if err != nil {
 			return nil, fmt.Errorf("can't read repositories: %s", err)
 		}
@@ -83,23 +85,21 @@ func (f *RepoFinder) userRepos(ctx context.Context, filter RepoFilter) ([]*githu
 		if resp.NextPage == 0 {
 			break
 		}
-		opt.Page = resp.NextPage
+		opts.Page = resp.NextPage
 	}
 
 	return filtered, nil
 }
 
 func (f *RepoFinder) orgRepos(ctx context.Context, filter RepoFilter) ([]*github.Repository, error) {
-	opt := &github.RepositoryListByOrgOptions{
-		ListOptions: github.ListOptions{PerPage: 30},
-	}
+	opts := &github.RepositoryListByOrgOptions{ListOptions: listOptions}
 	var (
 		filtered, repos []*github.Repository
 		resp            *github.Response
 		err             error
 	)
 	for {
-		repos, resp, err = f.Client.Repositories.ListByOrg(ctx, filter.Owner, opt)
+		repos, resp, err = f.Client.Repositories.ListByOrg(ctx, filter.Owner, opts)
 		if err != nil {
 			return nil, fmt.Errorf("can't read repositories: %s", err)
 		}
@@ -109,7 +109,7 @@ func (f *RepoFinder) orgRepos(ctx context.Context, filter RepoFilter) ([]*github
 		if resp.NextPage == 0 {
 			break
 		}
-		opt.Page = resp.NextPage
+		opts.Page = resp.NextPage
 	}
 
 	return filtered, nil

version/version.go

@@ -1,3 +1,3 @@
 package version
 
-var Version = "0.6.1"
+var Version = "0.6.2"