label: Add new create subcommand

Now that we only allow existing labels with issues/merge requests,
it is no longer possible to create a new label on-the-fly.

Instead, cover that use case with a new dedicated command.

cmd/label_create.go

@@ -0,0 +1,58 @@
+package cmd
+
+import (
+	"log"
+
+	"github.com/rsteube/carapace"
+	"github.com/spf13/cobra"
+	gitlab "github.com/xanzy/go-gitlab"
+	"github.com/zaquestion/lab/internal/action"
+	lab "github.com/zaquestion/lab/internal/gitlab"
+)
+
+var labelCreateCmd = &cobra.Command{
+	Use:     "create [remote] <name>",
+	Aliases: []string{"add"},
+	Short:   "Create a new label",
+	Long:    ``,
+	Example: `lab label create my-label
+lab label create --color cornflowerblue --description "Blue as a cornflower" blue
+lab label create --color #6495ed --description "Also blue as a cornflower" blue2`,
+	PersistentPreRun: LabPersistentPreRun,
+	Args:             cobra.MinimumNArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		rn, name, err := parseArgsRemoteAndProject(args)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		color, err := cmd.Flags().GetString("color")
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		desc, err := cmd.Flags().GetString("description")
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		err = lab.LabelCreate(rn, &gitlab.CreateLabelOptions{
+			Name:        &name,
+			Description: &desc,
+			Color:       &color,
+		})
+
+		if err != nil {
+			log.Fatal(err)
+		}
+	},
+}
+
+func init() {
+	labelCreateCmd.Flags().String("color", "#428BCA", "color of the new label in HTML hex notation or CSS color name")
+	labelCreateCmd.Flags().String("description", "", "description of the new label")
+	labelCmd.AddCommand(labelCreateCmd)
+	carapace.Gen(labelCmd).PositionalCompletion(
+		action.Remotes(),
+	)
+}

internal/gitlab/gitlab.go

@@ -766,6 +766,17 @@ func LabelList(project string) ([]*gitlab.Label, error) {
 	return labels, nil
 }
 
+// LabelCreate creates a new project label
+func LabelCreate(project string, opts *gitlab.CreateLabelOptions) error {
+	p, err := FindProject(project)
+	if err != nil {
+		return err
+	}
+
+	_, _, err = lab.Labels.CreateLabel(p.ID, opts)
+	return err
+}
+
 // ProjectSnippetCreate creates a snippet in a project
 func ProjectSnippetCreate(pid interface{}, opts *gitlab.CreateProjectSnippetOptions) (*gitlab.Snippet, error) {
 	snip, _, err := lab.ProjectSnippets.CreateSnippet(pid, opts)