Refactor commands to subpackage.

cmd/version.go

@@ -0,0 +1,28 @@
+package cmd
+
+import (
+	"fmt"
+	"github.com/gonuts/commander"
+	"github.com/gonuts/flag"
+	"github.com/smira/aptly/aptly"
+)
+
+func aptlyVersion(cmd *commander.Command, args []string) error {
+	fmt.Printf("aptly version: %s\n", aptly.Version)
+	return nil
+}
+
+func makeCmdVersion() *commander.Command {
+	return &commander.Command{
+		Run:       aptlyVersion,
+		UsageLine: "version",
+		Short:     "display version",
+		Long: `
+Shows aptly version.
+
+ex:
+  $ aptly version
+`,
+		Flag: *flag.NewFlagSet("aptly-version", flag.ExitOnError),
+	}
+}