add things

commands/version/version.go

@@ -0,0 +1,34 @@
+package version
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"runtime"
+
+	"github.com/google/subcommands"
+)
+
+const (
+	version string = "2.0.0"
+)
+
+type (
+	VersionCmd struct {
+	}
+)
+
+func (*VersionCmd) Name() string     { return "version" }
+func (*VersionCmd) Synopsis() string { return "" }
+func (*VersionCmd) Usage() string {
+	return `Usage: hash_utils version
+`
+}
+
+func (p *VersionCmd) SetFlags(f *flag.FlagSet) {
+}
+
+func (p *VersionCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
+	fmt.Printf("hash_utils %s %s/%s\n", version, runtime.GOOS, runtime.GOARCH)
+	return subcommands.ExitSuccess
+}