ensure config blackbox_decode is used consistently

manual/docs/index.md

@@ -361,6 +361,9 @@ For example:
 
 A warning will be displayed if the configuration file in not syntactically correct; in such cases its contents will be ignored. There is a somewhat [complete example](https://github.com/stronnag/bbl2kml/wiki/Sample-Config-file) in the wiki that can be used as a template.
 
+!!! Note "JSON Syntax"
+    The keys in the JSON file use hyphen (`-`), not underscore (`_`).
+
 Note also that the command interpreter allows `-flag` or `--flag` for any option.
 
 ## Limitations, Bugs, Bug Reporting

pkg/bbl/bblreader.go

@@ -306,7 +306,7 @@ func get_durations(fn string, meta []types.FlightMeta) {
 }
 
 func get_bb_duration(bbfile string, idx string) time.Duration {
-	cmd := exec.Command("blackbox_decode", "--stdout", "--index", idx, bbfile)
+	cmd := exec.Command(options.Config.Blackbox_decode, "--stdout", "--index", idx, bbfile)
 	out, err := cmd.StdoutPipe()
 	defer cmd.Wait()
 	defer out.Close()

pkg/options/options.go

@@ -187,6 +187,11 @@ func ParseCLI(gv func() string) ([]string, string) {
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Warning: config file ignored due to error: %v\n", err)
 	}
+
+	if os.Getenv("DUMP_CONFIG") != "" {
+		fmt.Fprintf(os.Stderr, "%+v\n", Config)
+	}
+
 	files := flag.Args()
 	return files, app
 }