add config flag (#1273)

runner/options.go

@@ -276,6 +276,7 @@ type Options struct {
 // ParseOptions parses the command line options for application
 func ParseOptions() *Options {
 	options := &Options{}
+	var cfgFile string
 
 	flagSet := goflags.NewFlagSet()
 	flagSet.SetDescription(`httpx is a fast and multi-purpose HTTP toolkit that allows running multiple probes using the retryablehttp library.`)
@@ -383,6 +384,7 @@ func ParseOptions() *Options {
 	)
 
 	flagSet.CreateGroup("configs", "Configurations",
+		flagSet.StringVar(&cfgFile, "config", "", "path to the httpx configuration file (default $HOME/.config/httpx/config.yaml)"),
 		flagSet.StringSliceVarP(&options.Resolvers, "resolvers", "r", nil, "list of custom resolver (file or comma separated)", goflags.NormalizedStringSliceOptions),
 		flagSet.Var(&options.Allow, "allow", "allowed list of IP/CIDR's to process (file or comma separated)"),
 		flagSet.Var(&options.Deny, "deny", "denied list of IP/CIDR's to process (file or comma separated)"),
@@ -435,6 +437,16 @@ func ParseOptions() *Options {
 
 	_ = flagSet.Parse()
 
+	if cfgFile != "" {
+		if !fileutil.FileExists(cfgFile) {
+			gologger.Fatal().Msgf("given config file '%s' does not exist", cfgFile)
+		}
+		// merge config file with flags
+		if err := flagSet.MergeConfigFile(cfgFile); err != nil {
+			gologger.Fatal().Msgf("Could not read config: %s\n", err)
+		}
+	}
+
 	if options.HealthCheck {
 		gologger.Print().Msgf("%s\n", DoHealthCheck(options, flagSet))
 		os.Exit(0)