refactor(cli): move cmd/uncloud to cmd/uc, change the artifact name uncloud_* -> uc_*

cmd/uc/context/ls.go

@@ -0,0 +1,56 @@
+package context
+
+import (
+	"fmt"
+	"maps"
+	"slices"
+
+	"charm.land/lipgloss/v2"
+	"github.com/psviderski/uncloud/internal/cli"
+	"github.com/psviderski/uncloud/internal/cli/tui"
+	"github.com/spf13/cobra"
+)
+
+func NewListCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:     "ls",
+		Aliases: []string{"list"},
+		Short:   "List available cluster contexts.",
+		Args:    cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			uncli := cmd.Context().Value("cli").(*cli.CLI)
+			return list(uncli)
+		},
+	}
+
+	return cmd
+}
+
+func list(uncli *cli.CLI) error {
+	if uncli.Config == nil {
+		return fmt.Errorf("context management is not available: Uncloud configuration file is not being used")
+	}
+
+	if len(uncli.Config.Contexts) == 0 {
+		fmt.Println("No contexts found")
+		return nil
+	}
+
+	contextNames := slices.Sorted(maps.Keys(uncli.Config.Contexts))
+	currentContext := uncli.Config.CurrentContext
+
+	t := tui.NewTable()
+	t.Headers("NAME", "CURRENT", "CONNECTIONS")
+
+	for _, name := range contextNames {
+		current := ""
+		if name == currentContext {
+			current = "✓"
+		}
+		connCount := len(uncli.Config.Contexts[name].Connections)
+		t.Row(name, current, fmt.Sprintf("%d", connCount))
+	}
+
+	lipgloss.Println(t)
+	return nil
+}