action/command: Prevent overwriting settings set locally or by plugin

- on `reload`
- on `filetype` change

internal/action/command.go

@@ -410,7 +410,7 @@ func reloadRuntime(reloadPlugins bool) {
 	for _, b := range buffer.OpenBuffers {
 		config.InitLocalSettings(b.Settings, b.Path)
 		for k, v := range b.Settings {
-			b.SetOptionNative(k, v)
+			b.DoSetOptionNative(k, v)
 		}
 		b.UpdateRules()
 	}
@@ -610,9 +610,8 @@ func SetGlobalOptionNative(option string, nativeValue interface{}) error {
 
 	// ...at last check the buffer locals
 	for _, b := range buffer.OpenBuffers {
-		if err := b.SetOptionNative(option, nativeValue); err != nil {
+		b.DoSetOptionNative(option, nativeValue)
-			return err
+		delete(b.LocalSettings, option)
-		}
 	}
 
 	return config.WriteSettings(filepath.Join(config.ConfigDir, "settings.json"))

internal/buffer/buffer.go

@@ -86,6 +86,8 @@ type SharedBuffer struct {
 
 	// Settings customized by the user
 	Settings map[string]interface{}
+	// LocalSettings customized by the user for this buffer only
+	LocalSettings map[string]bool
 
 	Suggestions   []string
 	Completions   []string
@@ -326,6 +328,7 @@ func NewBuffer(r io.Reader, size int64, path string, startcursor Loc, btype BufT
 		// assigning the filetype.
 		settings := config.DefaultCommonSettings()
 		b.Settings = config.DefaultCommonSettings()
+		b.LocalSettings = make(map[string]bool)
 		for k, v := range config.GlobalSettings {
 			if _, ok := config.DefaultGlobalOnlySettings[k]; !ok {
 				// make sure setting is not global-only

internal/buffer/settings.go

@@ -8,13 +8,9 @@ import (
 	"github.com/zyedidia/micro/v2/internal/screen"
 )
 
-func (b *Buffer) SetOptionNative(option string, nativeValue interface{}) error {
+func (b *Buffer) DoSetOptionNative(option string, nativeValue interface{}) {
-	if err := config.OptionIsValid(option, nativeValue); err != nil {
-		return err
-	}
-
 	if reflect.DeepEqual(b.Settings[option], nativeValue) {
-		return nil
+		return
 	}
 
 	b.Settings[option] = nativeValue
@@ -46,10 +42,14 @@ func (b *Buffer) SetOptionNative(option string, nativeValue interface{}) error {
 				// filetype should not override volatile settings
 				continue
 			}
+			if _, ok := b.LocalSettings[k]; ok {
+				// filetype should not override local settings
+				continue
+			}
 			if _, ok := settings[k]; ok {
-				b.SetOptionNative(k, settings[k])
+				b.DoSetOptionNative(k, settings[k])
 			} else {
-				b.SetOptionNative(k, v)
+				b.DoSetOptionNative(k, v)
 			}
 		}
 		b.UpdateRules()
@@ -101,6 +101,15 @@ func (b *Buffer) SetOptionNative(option string, nativeValue interface{}) error {
 	if b.OptionCallback != nil {
 		b.OptionCallback(option, nativeValue)
 	}
+}
+
+func (b *Buffer) SetOptionNative(option string, nativeValue interface{}) error {
+	if err := config.OptionIsValid(option, nativeValue); err != nil {
+		return err
+	}
+
+	b.DoSetOptionNative(option, nativeValue)
+	b.LocalSettings[option] = true
 
 	return nil
 }