Add version info

main.go

@@ -16,6 +16,8 @@ import (
 	"github.com/derekparker/delve/proctl"
 )
 
+const version string = "0.1.0.beta"
+
 type term struct {
 	stdin *bufio.Reader
 }
@@ -32,6 +34,7 @@ func main() {
 		pid     int
 		proc    string
 		run     bool
+		printv  bool
 		err     error
 		dbgproc *proctl.DebuggedProcess
 		t       = newTerm()
@@ -41,6 +44,7 @@ func main() {
 	flag.IntVar(&pid, "pid", 0, "Pid of running process to attach to.")
 	flag.StringVar(&proc, "proc", "", "Path to process to run and debug.")
 	flag.BoolVar(&run, "run", false, "Compile program and begin debug session.")
+	flag.BoolVar(&printv, "v", false, "Print version number and exit.")
 	flag.Parse()
 
 	if flag.NFlag() == 0 {
@@ -48,6 +52,11 @@ func main() {
 		os.Exit(0)
 	}
 
+	if printv {
+		fmt.Printf("Delve version: %s\n", version)
+		os.Exit(0)
+	}
+
 	start := func(name string) *proctl.DebuggedProcess {
 		proc := exec.Command(name)
 		proc.Stdout = os.Stdout