2 files changed, 99 insertions, 0 deletions
diff --git a/cmd/gonf/cmd_version.go b/cmd/gonf/cmd_version.go
new file mode 100644
index 0000000..5cf7fb8
--- /dev/null
+++ b/cmd/gonf/cmd_version.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"runtime/debug"
+)
+
+var buildRevision, buildTime, buildModified string
+
+func init() {
+	if info, ok := debug.ReadBuildInfo(); ok {
+		for _, setting := range info.Settings {
+			switch setting.Key {
+			case "vcs.revision":
+				buildRevision = setting.Value
+			case "vcs.modified":
+				buildModified = setting.Value
+			case "vcs.time":
+				buildTime = setting.Value
+			}
+		}
+	}
+}
+
+func cmdVersion() {
+	modified := "clean"
+	if buildModified == "true" {
+		modified = "dirty"
+	}
+	fmt.Printf("gonf - %s %s %s\n", buildRevision, buildTime, modified)
+}
diff --git a/cmd/gonf/main.go b/cmd/gonf/main.go
new file mode 100644
index 0000000..882636a
--- /dev/null
+++ b/cmd/gonf/main.go
@@ -0,0 +1,68 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"os/signal"
+)
+
+var (
+	batchMode bool
+	helpMode  bool
+)
+
+func main() {
+	if err := run(context.Background(),
+		os.Args,
+		//os.Getenv,
+		//os.Getwd,
+		//os.Stdin,
+		os.Stdout,
+		os.Stderr,
+	); err != nil {
+		fmt.Fprintf(os.Stderr, "%s\n", err)
+		os.Exit(1)
+	}
+}
+
+func run(ctx context.Context,
+	args []string,
+	//getenv func(string) string,
+	//getwd func() (string, error),
+	//stdin io.Reader,
+	stdout, stderr io.Writer,
+) error {
+	ctx, cancel := signal.NotifyContext(ctx, os.Interrupt)
+	defer cancel()
+	f := flag.NewFlagSet(`gonf COMMAND [-FLAG]
+where COMMAND is one of:
+  * build: build configurations for one or more hosts
+  * help: show contextual help
+  * version: show build version and time
+where FLAG can be one or more of`, flag.ContinueOnError)
+	f.BoolVar(&batchMode, "batch", false, "skips all questions and confirmations, using the default (safe) choices each time")
+	f.BoolVar(&helpMode, "help", false, "show contextual help")
+	f.SetOutput(stderr)
+	f.Parse(args[1:])
+
+	if f.NArg() < 1 {
+		f.Usage()
+		return errors.New("No command given")
+	}
+	cmd := f.Arg(0)
+	switch cmd {
+	case "help":
+		f.SetOutput(stdout)
+		f.Usage()
+	case "version":
+		cmdVersion()
+	default:
+		f.Usage()
+		return fmt.Errorf("Invalid command: %s", cmd)
+	}
+	return nil
+}