Quick run through to add some documentation comments

wtf/config_files.go

@@ -28,7 +28,7 @@ func LoadConfigFile(filePath string) *config.Config {
 
 	cfg, err := config.ParseYamlFile(absPath)
 	if err != nil {
-		fmt.Println("\n\n\033[1m ERROR:\033[0m Could not load '\033[0;33mconfig.yml\033[0m'.\n Please add a \033[0;33mconfig.yml\033[0m file to your \033[0;33m~/.wtf\033[0m directory.\n See \033[1;34mhttps://github.com/senorprogrammer/wtf\033[0m for details.\n\n")
+		fmt.Println("\n\n\033[1m ERROR:\033[0m Could not load '\033[0;33mconfig.yml\033[0m'.\n Please add a \033[0;33mconfig.yml\033[0m file to your \033[0;33m~/.wtf\033[0m directory.\n See \033[1;34mhttps://github.com/senorprogrammer/wtf\033[0m for details.")
 		os.Exit(1)
 	}
 

wtf/focus_tracker.go

@@ -5,6 +5,8 @@ import (
 	"github.com/senorprogrammer/wtf/color"
 )
 
+// FocusTracker is used by the app to track which onscreen widget currently has focus,
+// and to move focus between widgets.
 type FocusTracker struct {
 	App     *tview.Application
 	Idx     int
@@ -13,16 +15,21 @@ type FocusTracker struct {
 
 /* -------------------- Exported Functions -------------------- */
 
+// Next sets the focus on the next widget in the widget list. If the current widget is
+// the last widget, sets focus on the first widget.
 func (tracker *FocusTracker) Next() {
 	tracker.blur(tracker.Idx)
 	tracker.increment()
 	tracker.focus(tracker.Idx)
 }
 
+// None removes focus from the currently-focused widget.
 func (tracker *FocusTracker) None() {
 	tracker.blur(tracker.Idx)
 }
 
+// Prev sets the focus on the previous widget in the widget list. If the current widget is
+// the last widget, sets focus on the last widget.
 func (tracker *FocusTracker) Prev() {
 	tracker.blur(tracker.Idx)
 	tracker.decrement()

wtf/utils.go

@@ -33,7 +33,10 @@ func ExecuteCommand(cmd *exec.Cmd) string {
 		str += string(b)
 	}
 
-	cmd.Wait()
+	err = cmd.Wait()
+	if err != nil {
+		return fmt.Sprintf("%v\n", err)
+	}
 
 	return str
 }