Enable autosave option

The autosave option is now specified as an integer, which denotes
the number of seconds to wait between saving the file. If the option
is 0, then autosaving is disabled. If the option is given by the user
as a boolean, it will be converted to 8 if true, and 0 if false.

Fixes #1479

internal/config/settings.go

@@ -35,7 +35,7 @@ func init() {
 
 // Options with validators
 var optionValidators = map[string]optionValidator{
-	// "autosave":     validateNonNegativeValue,
+	"autosave":     validateNonNegativeValue,
 	"tabsize":      validatePositiveValue,
 	"scrollmargin": validateNonNegativeValue,
 	"scrollspeed":  validateNonNegativeValue,
@@ -58,6 +58,18 @@ func ReadSettings() error {
 			if err != nil {
 				return errors.New("Error reading settings.json: " + err.Error())
 			}
+
+			// check if autosave is a boolean and convert it to float if so
+			if v, ok := parsedSettings["autosave"]; ok {
+				s, ok := v.(bool)
+				if ok {
+					if s {
+						parsedSettings["autosave"] = 8.0
+					} else {
+						parsedSettings["autosave"] = 0.0
+					}
+				}
+			}
 		}
 	}
 	return nil
@@ -232,7 +244,7 @@ func DefaultCommonSettings() map[string]interface{} {
 // a list of settings that should only be globally modified and their
 // default values
 var defaultGlobalSettings = map[string]interface{}{
-	// "autosave":    float64(0),
+	"autosave":       float64(0),
 	"colorscheme":    "default",
 	"infobar":        true,
 	"keymenu":        false,