chore(cli): reduce clutter from exp tasks list command (#19727)

Fixes https://github.com/coder/coder/issues/19623

- Stop showing the long ID of each task by default.
- Add new `--quiet` flag to only show IDs.

cli/exp_task_list.go

@@ -36,13 +36,13 @@ func (r *RootCmd) taskList() *serpent.Command {
 		statusFilter string
 		all          bool
 		user         string
+		quiet        bool
 
 		client    = new(codersdk.Client)
 		formatter = cliui.NewOutputFormatter(
 			cliui.TableFormat(
 				[]taskListRow{},
 				[]string{
-					"id",
 					"name",
 					"status",
 					"state",
@@ -98,6 +98,14 @@ func (r *RootCmd) taskList() *serpent.Command {
 				Default:     "",
 				Value:       serpent.StringOf(&user),
 			},
+			{
+				Name:          "quiet",
+				Description:   "Only display task IDs.",
+				Flag:          "quiet",
+				FlagShorthand: "q",
+				Default:       "false",
+				Value:         serpent.BoolOf(&quiet),
+			},
 		},
 		Handler: func(inv *serpent.Invocation) error {
 			ctx := inv.Context()
@@ -116,6 +124,14 @@ func (r *RootCmd) taskList() *serpent.Command {
 				return xerrors.Errorf("list tasks: %w", err)
 			}
 
+			if quiet {
+				for _, task := range tasks {
+					_, _ = fmt.Fprintln(inv.Stdout, task.ID.String())
+				}
+
+				return nil
+			}
+
 			// If no rows and not JSON, show a friendly message.
 			if len(tasks) == 0 && formatter.FormatID() != cliui.JSONFormat().ID() {
 				_, _ = fmt.Fprintln(inv.Stderr, "No tasks found.")

cli/exp_task_list_test.go

@@ -6,6 +6,8 @@ import (
 	"database/sql"
 	"encoding/json"
 	"io"
+	"slices"
+	"strings"
 	"testing"
 
 	"github.com/google/uuid"
@@ -200,6 +202,43 @@ func TestExpTaskList(t *testing.T) {
 
 		pty.ExpectMatch(ws.Name)
 	})
+
+	t.Run("Quiet", func(t *testing.T) {
+		t.Parallel()
+
+		// Quiet logger to reduce noise.
+		quiet := slog.Make(sloghuman.Sink(io.Discard))
+		client, db := coderdtest.NewWithDatabase(t, &coderdtest.Options{Logger: &quiet})
+		owner := coderdtest.CreateFirstUser(t, client)
+		memberClient, memberUser := coderdtest.CreateAnotherUser(t, client, owner.OrganizationID)
+
+		// Given: We have two tasks
+		task1 := makeAITask(t, db, owner.OrganizationID, owner.UserID, memberUser.ID, database.WorkspaceTransitionStart, "keep me running")
+		task2 := makeAITask(t, db, owner.OrganizationID, owner.UserID, memberUser.ID, database.WorkspaceTransitionStop, "stop me please")
+
+		// Given: We add the `--quiet` flag
+		inv, root := clitest.New(t, "exp", "task", "list", "--quiet")
+		clitest.SetupConfig(t, memberClient, root)
+
+		ctx := testutil.Context(t, testutil.WaitShort)
+		var stdout bytes.Buffer
+		inv.Stdout = &stdout
+		inv.Stderr = &stdout
+
+		// When: We run the command
+		err := inv.WithContext(ctx).Run()
+		require.NoError(t, err)
+
+		want := []string{task1.ID.String(), task2.ID.String()}
+		got := slice.Filter(strings.Split(stdout.String(), "\n"), func(s string) bool {
+			return len(s) != 0
+		})
+
+		slices.Sort(want)
+		slices.Sort(got)
+
+		require.Equal(t, want, got)
+	})
 }
 
 func TestExpTaskList_OwnerCanListOthers(t *testing.T) {