add 'license show', add printer.NewTableEmpty() along .WithHeaders() (#69)

README.md

@@ -550,6 +550,8 @@ index                       - manage indicies
     create                  - create a new index template
     update                  - update a new index template
     delete                  - delete an index template
+license                     - manage cluster license
+  show                      - show details about the cluster license
 node                        - manage nodes
   list                      - list nodes
   show                      - show details about a node
@@ -571,7 +573,7 @@ task                        - manage tasks
 version                     - show esctl version information
 debug                       - developer only
 help-jsonpath               - show jsonpath help
-help-command-overview       - show overview of all available commands
+help-usage                  - show overview of all available commands
 ```
 
 # Development

cmd/license.go

@@ -0,0 +1,49 @@
+/*
+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 cmd
+
+import (
+	"context"
+
+	"codeberg.org/scip/esctl/pkg/cfg"
+	"codeberg.org/scip/esctl/pkg/es"
+
+	"github.com/urfave/cli/v3"
+)
+
+func License(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:  "license",
+		Usage: "manage cluster license",
+
+		Commands: []*cli.Command{
+			LicenseShow(conf),
+		},
+	}
+}
+
+func LicenseShow(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:    "show",
+		Aliases: []string{"sh"},
+		Usage:   "show details about the cluster license",
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			return es.LicenseShow(conf)
+		},
+	}
+}

cmd/root.go

@@ -108,6 +108,7 @@ func Main() int {
 			Doc(conf),
 			Ilm(conf),
 			Index(conf),
+			License(conf),
 			Node(conf),
 			Roles(conf),
 			Search(conf),

pkg/es/license.go

@@ -0,0 +1,59 @@
+/*
+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"
+
+	"codeberg.org/scip/esctl/pkg/cfg"
+	"codeberg.org/scip/esctl/pkg/printer"
+)
+
+func LicenseShow(conf *cfg.Config) error {
+	res, err := conf.DefaultCluster.ES().License.Get().
+		Do(context.Background())
+	if err != nil {
+		return fmt.Errorf("failed to get license: %s", esErrorString(err))
+	}
+
+	slog.Debug("license show", "license", res)
+
+	table := printer.NewTableEmpty(conf).WithHeaders("license setting", "value")
+
+	lic := res.License
+
+	var maxnodes = "infinite"
+
+	if lic.MaxNodes != nil {
+		maxnodes = fmt.Sprintf("%d", *lic.MaxNodes)
+	}
+
+	table.Entries = [][]string{
+		{"UID", lic.Uid},
+		{"Issued to", lic.IssuedTo},
+		{"Expires", lic.ExpiryDate.(string)},
+		{"Issued", lic.IssueDate.(string)},
+		{"Max nodes", maxnodes},
+		{"Max resource units", fmt.Sprintf("%d", *lic.MaxResourceUnits)},
+		{"Type", lic.Type.Name},
+		{"Status", lic.Status.Name},
+	}
+
+	return table.Print()
+}

pkg/printer/table.go

@@ -53,6 +53,24 @@ func NewTable(conf *cfg.Config, columns, rows int) *Table {
 	return &table
 }
 
+func NewTableEmpty(conf *cfg.Config) *Table {
+	table := Table{Mode: conf.Output, maxwidth: cfg.GetTermWidth()}
+	table.alignInts = conf.AlignInts
+	return &table
+}
+
+func (table *Table) WithHeaders(headers ...string) *Table {
+	count := len(headers)
+
+	table.Entries = [][]string{}
+	table.lenHeaders = make([]int, count)
+	table.Headers = make([]string, count)
+
+	table.Addheaders(headers...)
+
+	return table
+}
+
 func (data *Table) Print() error {
 	switch data.Mode {
 	case "markdown", "md":