Sync labels between repositories (#2)

Closes #2

client/github/github_labels.go

@@ -0,0 +1,22 @@
+package github
+
+import (
+	"context"
+	"github.com/google/go-github/v67/github"
+	"propromo/utils"
+)
+
+func ListGitHubLabels(repo utils.GitRepo) ([]*github.Label, error) {
+	ctx := context.Background()
+
+	labels, _, err := client.Issues.ListLabels(ctx, repo.Owner, repo.Repository, nil)
+	return labels, err
+}
+
+func CreateGitHubLabel(token string, repo utils.GitRepo, label *github.Label) (*github.Label, error) {
+	ctx := context.Background()
+	client := github.NewClient(nil).WithAuthToken(token)
+
+	label, _, err := client.Issues.CreateLabel(ctx, repo.Owner, repo.Repository, label)
+	return label, err
+}

cmd/github/sync.go

@@ -16,6 +16,7 @@ var targets []string
 
 func init() {
 	syncCmd.AddCommand(milestonesCmd)
+	syncCmd.AddCommand(labelsCmd)
 }
 
 func getToken() string {

cmd/github/sync_labels.go

@@ -0,0 +1,54 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	githubmodel "github.com/google/go-github/v67/github"
+	"github.com/spf13/cobra"
+	"propromo/client/github"
+	"propromo/cmdutils"
+	"propromo/utils"
+)
+
+var labelsCmd = &cobra.Command{
+	Use:   "labels",
+	Short: "Sync labels from one repo to others",
+	Run: func(command *cobra.Command, args []string) {
+		fmt.Println("Syncing from", source, "to", targets)
+
+		sourceRepo, err := utils.ParseGitRepo(source)
+		cobra.CheckErr(err)
+
+		labels, err := github.ListGitHubLabels(sourceRepo)
+		cobra.CheckErr(err)
+
+		repos := make([]utils.GitRepo, len(targets))
+		for i, target := range targets {
+			repo, err := utils.ParseGitRepo(target)
+			cobra.CheckErr(err)
+			repos[i] = repo
+		}
+
+		token := getToken()
+		for _, repo := range repos {
+			for _, label := range labels {
+				_, err := github.CreateGitHubLabel(token, repo, &githubmodel.Label{
+					Name:        label.Name,
+					Description: label.Description,
+					Color:       label.Color,
+				})
+
+				var ghErr *githubmodel.ErrorResponse
+				if errors.As(err, &ghErr) && len(ghErr.Errors) == 1 && ghErr.Errors[0].Code == "already_exists" {
+					cmdutils.Logger.Info("Label already exists!", "repo", repo.String(), "label", *label.Name)
+					continue
+				}
+				cmdutils.Logger.Info("Label successfully created", "repo", repo.String(), "label", *label.Name)
+			}
+		}
+	},
+}
+
+func init() {
+	syncFlags(labelsCmd)
+}