Updated cli flags

Better usage message
Flipped the -pretty flag to -jsonlogs. Is now pretty per default

flags.go

@@ -1,17 +1,23 @@
 package main
 
-import "flag"
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/rs/zerolog/log"
+)
 
 var (
-	flagPrettyPrint *bool = flag.Bool(
-		"pretty",
+	flagLogJson *bool = flag.Bool(
+		"jsonlogs",
 		false,
-		"If set, pretty prints logging entries which would be json objects otherwise",
+		"If set, writes logging messages as json objects instead",
 	)
 	flagConfigFile *string = flag.String(
 		"config",
 		"config.toml",
-		"Location of the config file. Defaults to \"config.toml\"",
+		"Location of the config file",
 	)
 	flagLogLevel *string = flag.String(
 		"loglevel",
@@ -25,6 +31,29 @@ var (
 	)
 )
 
+func flagUsage() {
+	executable, err := os.Executable()
+	if err != nil {
+		log.Fatal().Err(err).Msg("Failed to get own path")
+	}
+	fmt.Fprintf(os.Stderr, "Usage of %s:\n", executable)
+	fmt.Fprintln(os.Stderr, "\t-config string")
+	fmt.Fprintln(os.Stderr, "\t\tLocation of the config file (default: \"config.toml\")")
+	fmt.Fprintln(os.Stderr, "\t-loglevel string")
+	fmt.Fprintln(
+		os.Stderr,
+		"\t\tSet the logging level. Options are: Trace, Debug, Info, Warning, Error and Fatal. Case insensitive (default: \"Info\")",
+	)
+	fmt.Fprintln(os.Stderr, "\t-validate-config")
+	fmt.Fprintln(
+		os.Stderr,
+		"\t\tIf set, the server will only validate the config (or write the default one) and then quit",
+	)
+	fmt.Fprintln(os.Stderr, "\t-jsonlogs")
+	fmt.Fprintln(os.Stderr, "\t\tIf set, writes logging messages as json objects instead")
+}
+
 func init() {
+	flag.Usage = flagUsage
 	flag.Parse()
 }

main.go

@@ -96,7 +96,6 @@ func main() {
 }
 
 func setLogLevel() {
-	log.Info().Str("new-level", *flagLogLevel).Msg("Attempting to set log level")
 	switch strings.ToLower(*flagLogLevel) {
 	case "trace":
 		zerolog.SetGlobalLevel(zerolog.TraceLevel)
@@ -113,10 +112,11 @@ func setLogLevel() {
 	default:
 		zerolog.SetGlobalLevel(zerolog.InfoLevel)
 	}
+	log.Info().Str("new-level", *flagLogLevel).Msg("New logging level set")
 }
 
 func setLogger(extraLogWriters ...io.Writer) {
-	if *flagPrettyPrint {
+	if !*flagLogJson {
 		console := zerolog.ConsoleWriter{Out: os.Stderr}
 		log.Logger = zerolog.New(zerolog.MultiLevelWriter(append([]io.Writer{console}, extraLogWriters...)...)).
 			With().