Refactor

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

internal/cli/titles.go

@@ -0,0 +1,43 @@
+package cli
+
+import (
+	"fmt"
+	"log"
+	"strings"
+
+	"code.oliverdavies.uk/opdavies/cmd-zet/internal/json"
+	"code.oliverdavies.uk/opdavies/cmd-zet/internal/zet"
+	"github.com/spf13/cobra"
+)
+
+var titlesCmd = &cobra.Command{
+	Use:     "titles",
+	Aliases: []string{"t"},
+	Short:   "Print IDs and titles of zettels",
+	Long: `Print the IDs and titles of all zettels.
+
+If -j or --json is added, the results will be in JSON format.`,
+	Run: func(cli *cobra.Command, args []string) {
+		zets := zet.GetAllZets()
+
+		result := zet.ParseZetList(zets)
+
+		if jsonOutput {
+			json, err := json.AsJSON(result)
+
+			if err != nil {
+				log.Fatal(err)
+			}
+
+			fmt.Println(json)
+		} else {
+			fmt.Println(strings.Join(result, "\n"))
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(titlesCmd)
+
+	titlesCmd.Flags().BoolVarP(&jsonOutput, "json", "j", false, "Output results in JSON format")
+}