Add sutil CLI in cmd/sutil with internal/cli command tree

internal/cli/cli.go

@@ -0,0 +1,39 @@
+// Package cli implements the sutil command tree.
+//
+// The tree is built by New rather than assembled in init functions, so
+// the package holds no global state and tests can construct it repeatedly
+// with captured input and output.
+package cli
+
+import (
+	"github.com/spf13/cobra"
+)
+
+// Params configures New.
+type Params struct {
+	// Version is the version string embedded at build time. It is shown
+	// by `sutil version`, `sutil --version`, and `sutil info`.
+	Version string
+}
+
+// New builds the root sutil command with every subcommand attached.
+func New(p Params) *cobra.Command {
+	root := &cobra.Command{
+		Use:   "sutil",
+		Short: "sneak's shell utility",
+		Long: `sutil is a small collection of shell utilities built on the packages in
+sneak.berlin/go/x: fast pseudorandom byte streams, memorable passwords,
+BIP39 mnemonics, and crypto_box keypairs derived from them.`,
+		Version:      p.Version,
+		SilenceUsage: true,
+	}
+
+	root.AddCommand(
+		newVersionCommand(p),
+		newInfoCommand(p),
+		newGenerateCommand(),
+		newCBKCommand(),
+	)
+
+	return root
+}