Adds label command and subcommands

app/github.go

@@ -154,3 +154,45 @@ func (a *App) GithubSync() error {
 
 	return a.Save()
 }
+
+func (a *App) ListLabels() ([]string, error) {
+	owner, repo := a.Campaign.RepoComponents()
+	opts := &github.ListOptions{Page: 0, PerPage: 100}
+	labels, _, err := a.GithubClient.Issues.ListLabels(context.Background(), owner, repo, opts)
+	if err != nil {
+		return nil, err
+	}
+
+	strLabels := make([]string, len(labels))
+	for i, label := range labels {
+		strLabels[i] = *label.Name
+	}
+
+	return strLabels, nil
+}
+
+func (a *App) CheckLabels(labels []string) (bool, []string, error) {
+	ghLabels, err := a.ListLabels()
+	if err != nil {
+		return false, nil, err
+	}
+
+	badLabels := []string{}
+	for _, label := range labels {
+		exists := false
+		for _, ghLabel := range ghLabels {
+			if label == ghLabel {
+				exists = true
+			}
+		}
+
+		if !exists {
+			badLabels = append(badLabels, label)
+		}
+	}
+
+	if len(badLabels) == 0 {
+		return true, nil, nil
+	}
+	return false, badLabels, nil
+}

cmd/label.go

@@ -0,0 +1,141 @@
+package cmd
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"strings"
+
+	"github.com/fatih/color"
+	"github.com/spf13/cobra"
+
+	"git.ctrlz.es/mgdelacroix/campaigner/app"
+)
+
+const defaultEditor = "vim"
+
+func ListLabelCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "list",
+		Short: "List the local campaign labels",
+		Args:  cobra.NoArgs,
+		Run:   withApp(listLabelCmdF),
+	}
+}
+
+func RemoteLabelCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "remote",
+		Short: "List all the GitHub repository labels",
+		Args:  cobra.NoArgs,
+		Run:   withApp(remoteLabelCmdF),
+	}
+}
+
+func UpdateLabelCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "update",
+		Short: "Updates the campaign GitHub labels",
+		Args:  cobra.NoArgs,
+		Run:   withApp(updateLabelCmdF),
+	}
+
+	cmd.Flags().BoolP("skip-check", "s", false, "do not check if the labels exist in the remote repository")
+
+	return cmd
+}
+
+func LabelCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "label",
+		Short: "Commands to manage GitHub labels",
+	}
+
+	cmd.AddCommand(
+		ListLabelCmd(),
+		RemoteLabelCmd(),
+		UpdateLabelCmd(),
+	)
+
+	return cmd
+}
+
+func listLabelCmdF(a *app.App, cmd *cobra.Command, _ []string) {
+	for _, label := range a.Campaign.Github.Labels {
+		fmt.Println(label)
+	}
+}
+
+func remoteLabelCmdF(a *app.App, cmd *cobra.Command, _ []string) {
+	labels, err := a.ListLabels()
+	if err != nil {
+		ErrorAndExit(cmd, fmt.Errorf("cannot retrieve labels list: %w", err))
+	}
+
+	fmt.Printf("Labels for repository %s:\n\n", color.GreenString(a.Campaign.Github.Repo))
+	for _, label := range labels {
+		fmt.Println(label)
+	}
+}
+
+func updateLabelCmdF(a *app.App, cmd *cobra.Command, _ []string) {
+	skipCheck, _ := cmd.Flags().GetBool("skip-check")
+
+	file, err := ioutil.TempFile(os.TempDir(), "campaigner-")
+	if err != nil {
+		ErrorAndExit(cmd, fmt.Errorf("cannot create temp file: %w", err))
+	}
+	defer func() {
+		file.Close()
+		os.Remove(file.Name())
+	}()
+	labelBytes := []byte(strings.Join(a.Campaign.Github.Labels, "\n"))
+	if _, err := file.Write(labelBytes); err != nil {
+		ErrorAndExit(cmd, fmt.Errorf("cannot write labels to temp file: %w", err))
+	}
+
+	editor := os.Getenv("EDITOR")
+	if editor == "" {
+		editor = defaultEditor
+	}
+
+	editorCmd := exec.Command(editor, file.Name())
+	editorCmd.Stdout = cmd.OutOrStdout()
+	editorCmd.Stdin = cmd.InOrStdin()
+	editorCmd.Stderr = cmd.ErrOrStderr()
+
+	if err := editorCmd.Run(); err != nil {
+		ErrorAndExit(cmd, fmt.Errorf("cannot run editor command: %w", err))
+	}
+
+	newLabelBytes, err := ioutil.ReadFile(file.Name())
+	if err != nil {
+		ErrorAndExit(cmd, fmt.Errorf("cannot read file: %w", err))
+	}
+
+	newLabels := []string{}
+	for _, label := range strings.Split(string(newLabelBytes), "\n") {
+		if label != "" {
+			newLabels = append(newLabels, strings.TrimSpace(label))
+		}
+	}
+
+	if !skipCheck {
+		ok, badLabels, err := a.CheckLabels(newLabels)
+		if err != nil {
+			ErrorAndExit(cmd, fmt.Errorf("cannot check new labels list: %w", err))
+		}
+
+		if !ok {
+			ErrorAndExit(cmd, fmt.Errorf("these labels doesn't exist in the repository:\n\n%s", strings.Join(badLabels, "\n")))
+		}
+	}
+
+	a.Campaign.Github.Labels = newLabels
+	if err := a.Save(); err != nil {
+		ErrorAndExit(cmd, fmt.Errorf("cannot save campaign: %w", err))
+	}
+
+	cmd.Println("Labels successfully updated")
+}

cmd/root.go

@@ -47,6 +47,7 @@ func RootCmd() *cobra.Command {
 		AddCmd(),
 		// FilterCmd(),
 		InitCmd(),
+		LabelCmd(),
 		StatusCmd(),
 		PublishCmd(),
 		PullCmd(),