add task support (#39)

fixes #34

pkg/es/task.go

@@ -0,0 +1,79 @@
+/*
+Copyright © 2026 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package es
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"strconv"
+	"time"
+
+	"codeberg.org/scip/esctl/pkg/cfg"
+	"codeberg.org/scip/esctl/pkg/printer"
+)
+
+func TaskList(conf *cfg.Config) error {
+	res, err := conf.DefaultCluster.ES.Cat.Tasks().
+		Header("content-type", "application/json").
+		Header("accept", "application/json").
+		Do(context.Background())
+
+	if err != nil {
+		return fmt.Errorf("failed to get index templates: %s", esErrorString(err))
+	}
+
+	slog.Debug("res", "tasks", res)
+
+	table := printer.NewTable(conf, 8, len(res))
+	table.Addheaders("task id", "action", "start time", "run time", "node", "type")
+	for idx, task := range res {
+		var ts time.Time
+
+		epc, err := strconv.Atoi(*task.StartTime)
+		if err != nil {
+			ts = time.Now()
+		} else {
+			ts = time.Unix(int64(epc/1000), 0)
+		}
+
+		table.Entries[idx] = []string{
+			*task.TaskId,
+			*task.Action,
+			ts.Format("2006-01-02T15:04:05"),
+			*task.RunningTime,
+			*task.Node,
+			*task.Type,
+		}
+	}
+
+	return table.Print()
+}
+
+func TaskCancel(conf *cfg.Config, taskid string) error {
+	_, err := conf.DefaultCluster.ES.Tasks.Cancel().
+		TaskId(taskid).
+		Header("content-type", "application/json").
+		Header("accept", "application/json").
+		Do(context.Background())
+
+	if err != nil {
+		return fmt.Errorf("failed to cancel task: %s", esErrorString(err))
+	}
+
+	return nil
+}