Remove cpuprofile flag, add version flag.

README.md

@@ -24,20 +24,20 @@ Available command-line flags are as follows:
 
 ```
 Usage of rtlamr:
-  -cpuprofile=: write cpu profile to this file
   -decimation=1: integer decimation factor, keep every nth sample
   -duration=0: time to run for, 0 for infinite, ex. 1h5m10s
   -filterid=: display only messages matching an id in a comma-separated list of ids.
   -filtertype=: display only messages matching a type in a comma-separated list of types.
   -format=plain: format to write log messages in: plain, csv, json, xml or gob
   -gobunsafe=false: allow gob output to stdout
   -logfile=/dev/stdout: log statement dump file
-  -msgtype=scm: message type to receive: scm, idm or r900
+  -msgtype=scm: message type to receive: scm, idm, r900 or scm+
   -quiet=false: suppress printing state information at startup
   -samplefile=/dev/null: raw signal dump file
   -single=false: one shot execution, if used with -filterid, will wait for exactly one packet from each meter id
-  -symbollength=72: symbol length in samples, see -help for valid lengths
+  -symbollength=72: symbol length in samples
   -unique=false: suppress duplicate messages from each meter
+  -version=false: display build date and commit hash
 
 rtltcp specific:
   -agcmode=false: enable/disable rtl agc
@@ -53,6 +53,7 @@ rtltcp specific:
   -tunergain=0: set tuner gain in dB
   -tunergainmode=false: enable/disable tuner gain
   -tunerxtalfreq=0: set tuner xtal frequency
+
 ```
 
 Running the receiver is as simple as starting an `rtl_tcp` instance and then starting the receiver:

flags.go

@@ -57,6 +57,8 @@ var gobUnsafe = flag.Bool("gobunsafe", false, "allow gob output to stdout")
 var quiet = flag.Bool("quiet", false, "suppress printing state information at startup")
 var single = flag.Bool("single", false, "one shot execution, if used with -filterid, will wait for exactly one packet from each meter id")
 
+var version = flag.Bool("version", false, "display build date and commit hash")
+
 func RegisterFlags() {
 	meterID = MeterIDFilter{make(UintMap)}
 	meterType = MeterTypeFilter{make(UintMap)}
@@ -80,6 +82,7 @@ func RegisterFlags() {
 		"single":       true,
 		"cpuprofile":   true,
 		"fastmag":      true,
+		"version":      true,
 	}
 
 	printDefaults := func(validFlags map[string]bool, inclusion bool) {

recv.go

@@ -24,7 +24,6 @@ import (
 	"log"
 	"os"
 	"os/signal"
-	"runtime/pprof"
 	"strings"
 	"time"
 
@@ -193,13 +192,28 @@ func init() {
 	log.SetFlags(log.Lshortfile | log.Lmicroseconds)
 }
 
-var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to this file")
+var (
+	buildDate  string // date -u '+%Y-%m-%d'
+	commitHash string // git rev-parse HEAD
+)
 
 func main() {
 	rcvr.RegisterFlags()
 	RegisterFlags()
 
 	flag.Parse()
+	if *version {
+		if buildDate == "" || commitHash == "" {
+			fmt.Println("Built from source.")
+			fmt.Println("Build Date: Unknown")
+			fmt.Println("Commit:     Unknown")
+		} else {
+			fmt.Println("Build Date:", buildDate)
+			fmt.Println("Commit:    ", commitHash)
+		}
+		os.Exit(0)
+	}
+
 	HandleFlags()
 
 	rcvr.NewReceiver()
@@ -208,14 +222,5 @@ func main() {
 	defer sampleFile.Close()
 	defer rcvr.Close()
 
-	if *cpuprofile != "" {
-		f, err := os.Create(*cpuprofile)
-		if err != nil {
-			log.Fatal(err)
-		}
-		pprof.StartCPUProfile(f)
-		defer pprof.StopCPUProfile()
-	}
-
 	rcvr.Run()
 }