option: Add default value for reload option and documentation

internal/action/bufpane.go

@@ -397,11 +397,6 @@ func (h *BufPane) Name() string {
 
 func (h *BufPane) getReloadSetting() string {
 	reloadSetting := h.Buf.Settings["reload"]
-
-	if reloadSetting == nil {
-		return "prompt"
-	}
-
 	return reloadSetting.(string)
 }
 
@@ -421,9 +416,9 @@ func (h *BufPane) HandleEvent(event tcell.Event) {
 					h.Buf.ReOpen()
 				}
 			})
-		} else if (reload == "auto") {
+		} else if reload == "auto" {
 			h.Buf.ReOpen()
-		} else if (reload == "disabled") {
+		} else if reload == "disabled" {
 			h.Buf.DisableReload()
 		} else {
 			InfoBar.Message("Invalid reload setting")

internal/config/settings.go

@@ -52,6 +52,7 @@ var optionValidators = map[string]optionValidator{
 	"fileformat":   validateLineEnding,
 	"encoding":     validateEncoding,
 	"multiopen":    validateMultiOpen,
+	"reload":       validateReload,
 }
 
 func ReadSettings() error {
@@ -294,6 +295,7 @@ var defaultCommonSettings = map[string]interface{}{
 	"mkparents":      false,
 	"permbackup":     false,
 	"readonly":       false,
+	"reload":         "prompt",
 	"rmtrailingws":   false,
 	"ruler":          true,
 	"relativeruler":  false,
@@ -526,3 +528,19 @@ func validateMultiOpen(option string, value interface{}) error {
 
 	return nil
 }
+
+func validateReload(option string, value interface{}) error {
+	val, ok := value.(string)
+
+	if !ok {
+		return errors.New("Expected string type for reload")
+	}
+
+	switch val {
+	case "prompt", "auto", "disabled":
+	default:
+		return errors.New(option + " must be 'prompt', 'auto' or 'disabled'")
+	}
+
+	return nil
+}

runtime/help/options.md

@@ -281,6 +281,11 @@ Here are the available options:
 
     default value: `false`
 
+* `reload`: controls the reload behavior of the current buffer in case the file
+   has changed. The available options are `prompt`, `auto` & `disabled`.
+
+   default value: `prompt`
+
 * `rmtrailingws`: micro will automatically trim trailing whitespaces at ends of
    lines. Note: This setting overrides `keepautoindent`