Resolve https://github.com/matthieugrieger/mumbledj/issues/158: Config values can now be overriden directly via commandline arguments

CHANGELOG.md

@@ -1,6 +1,12 @@
 MumbleDJ Changelog
 ==================
 
+### June 25, 2016 -- `v3.0.7`
+* Volume can now be set to `volume.lowest` and `volume.highest` (in other words, the range is inclusive now instead of exclusive).
+* All configuration values can now be overriden via commandline arguments. For example: `mumbledj --admins.names="SuperUser,Matt" --volume.default="0.5" --commands.add.is_admin="false"`
+  * __NOTE__: Configuration settings that contain commas (",") are interpreted as string slices (or arrays if you aren't familiar with Go).
+* Removed an extra period that was sometimes output in error messages.
+
 ### June 25, 2016 -- `v3.0.6`
 * Fixed an issue with `!forceskip` not stopping audio playback.
 

README.md

@@ -136,6 +136,14 @@ GLOBAL OPTIONS:
 
 ```
 
+__NOTE__: You can also override all settings found within `config.yaml` directly from the commandline. Here's an example:
+
+```
+mumbledj --admins.names="SuperUser,Matt" --volume.default="0.5" --volume.lowest="0.2" --queue.automatic_shuffle_on="true"
+```
+
+Keep in mind that values that contain commas (such as `"SuperUser,Matt"`) will be interpreted as string slices, or arrays if you are not familiar with Go. If you want your value to be interpreted as a normal string, it is best to avoid commas for now.
+
 ## Commands
 
 ### add

main.go

@@ -32,7 +32,7 @@ func init() {
 	services.DJ = DJ
 	bot.DJ = DJ
 
-	DJ.Version = "v3.0.6"
+	DJ.Version = "v3.0.7"
 
 	logrus.SetLevel(logrus.WarnLevel)
 }
@@ -97,11 +97,31 @@ func main() {
 			Usage: "if present, all debug messages will be shown",
 		},
 	}
+
+	hiddenFlags := make([]cli.Flag, len(viper.AllKeys()))
+	for i, configValue := range viper.AllKeys() {
+		hiddenFlags[i] = cli.StringFlag{
+			Name:   configValue,
+			Hidden: true,
+		}
+	}
+	app.Flags = append(app.Flags, hiddenFlags...)
+
 	app.Action = func(c *cli.Context) error {
 		if c.Bool("debug") {
 			logrus.SetLevel(logrus.InfoLevel)
 		}
 
+		for _, configValue := range viper.AllKeys() {
+			if c.GlobalIsSet(configValue) {
+				if strings.Contains(c.String(configValue), ",") {
+					viper.Set(configValue, strings.Split(c.String(configValue), ","))
+				} else {
+					viper.Set(configValue, c.String(configValue))
+				}
+			}
+		}
+
 		viper.SetConfigFile(c.String("config"))
 		if err := viper.ReadInConfig(); err != nil {
 			logrus.WithFields(logrus.Fields{