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

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()
+}