Add new urlutil option, and have these be reloadable

Handles #897 and part of #593

app/wtf_app.go

@@ -140,6 +140,8 @@ func (wtfApp *WtfApp) watchForConfigChanges() {
 
 				config := cfg.LoadWtfConfigFile(wtfApp.configFilePath)
 				newApp := NewWtfApp(wtfApp.app, config, wtfApp.configFilePath)
+				openUrlUtil := utils.ToStrs(config.UList("wtf.openUrlUtil", []interface{}{}))
+				utils.Init(config.UString("wtf.openFileUtil", "open"), openUrlUtil)
 
 				newApp.Start()
 			case err := <-watch.Error:

main.go

@@ -60,7 +60,8 @@ func main() {
 		defer profile.Start(profile.MemProfile).Stop()
 	}
 
-	utils.Init(config.UString("wtf.openFileUtil", "open"))
+	openUrlUtil := utils.ToStrs(config.UList("wtf.openUrlUtil", []interface{}{}))
+	utils.Init(config.UString("wtf.openFileUtil", "open"), openUrlUtil)
 
 	setTerm(config)
 

utils/init.go

@@ -2,8 +2,10 @@ package utils
 
 // OpenFileUtil defines the system utility to use to open files
 var OpenFileUtil = "open"
+var OpenUrlUtil = []string{}
 
 // Init initializes global settings in the wtf package
-func Init(openFileUtil string) {
+func Init(openFileUtil string, openUrlUtil []string) {
 	OpenFileUtil = openFileUtil
+	OpenUrlUtil = openUrlUtil
 }

utils/utils.go

@@ -100,6 +100,12 @@ func Includes(strs []string, val string) bool {
 // OpenFile opens the file defined in `path` via the operating system
 func OpenFile(path string) {
 	if (strings.HasPrefix(path, "http://")) || (strings.HasPrefix(path, "https://")) {
+		if len(OpenUrlUtil) > 0 {
+			commands := append(OpenUrlUtil, path)
+			args := commands[1:len(commands)]
+			exec.Command(commands[0], args...).Start()
+			return
+		}
 		switch runtime.GOOS {
 		case "linux":
 			exec.Command("xdg-open", path).Start()