chore: use gofumpt for code formatting

internal/storage/filter.go

@@ -15,7 +15,8 @@ import (
 // to the given selection. The filtered servers are deep copied so they
 // are safe for mutation by the caller.
 func (s *Storage) FilterServers(provider string, selection settings.ServerSelection) (
-	servers []models.Server, err error) {
+	servers []models.Server, err error,
+) {
 	if provider == providers.Custom {
 		return nil, nil
 	}
@@ -47,7 +48,8 @@ func (s *Storage) FilterServers(provider string, selection settings.ServerSelect
 }
 
 func filterServer(server models.Server,
-	selection settings.ServerSelection) (filtered bool) {
+	selection settings.ServerSelection,
+) (filtered bool) {
 	// Note each condition is split to make sure
 	// we have full testing coverage.
 	if server.VPN != selection.VPN {
@@ -151,7 +153,8 @@ func filterAnyByPossibilities(values, possibilities []string) (filtered bool) {
 }
 
 func filterByProtocol(selection settings.ServerSelection,
-	serverTCP, serverUDP bool) (filtered bool) {
+	serverTCP, serverUDP bool,
+) (filtered bool) {
 	switch selection.VPN {
 	case vpn.Wireguard:
 		return !serverUDP

internal/storage/flush.go

@@ -21,7 +21,7 @@ func (s *Storage) FlushToFile(path string) error {
 // flushToFile flushes the merged servers data to the file
 // specified by path, as indented JSON. It is not thread-safe.
 func (s *Storage) flushToFile(path string) error {
-	const permission = 0644
+	const permission = 0o644
 	dirPath := filepath.Dir(path)
 	if err := os.MkdirAll(dirPath, permission); err != nil {
 		return err

internal/storage/merge.go

@@ -27,7 +27,8 @@ func (s *Storage) mergeServers(hardcoded, persisted models.AllServers) models.Al
 }
 
 func (s *Storage) mergeProviderServers(provider string,
-	hardcoded, persisted models.Servers) (merged models.Servers) {
+	hardcoded, persisted models.Servers,
+) (merged models.Servers) {
 	if persisted.Timestamp > hardcoded.Timestamp {
 		diff := time.Unix(persisted.Timestamp, 0).Sub(time.Unix(hardcoded.Timestamp, 0))
 		if diff < 0 {

internal/storage/read.go

@@ -16,7 +16,8 @@ import (
 // It only reads servers that have the same version as the hardcoded servers version
 // to avoid JSON decoding errors.
 func (s *Storage) readFromFile(filepath string, hardcodedVersions map[string]uint16) (
-	servers models.AllServers, err error) {
+	servers models.AllServers, err error,
+) {
 	file, err := os.Open(filepath)
 	if os.IsNotExist(err) {
 		return servers, nil
@@ -37,7 +38,8 @@ func (s *Storage) readFromFile(filepath string, hardcodedVersions map[string]uin
 }
 
 func (s *Storage) extractServersFromBytes(b []byte, hardcodedVersions map[string]uint16) (
-	servers models.AllServers, err error) {
+	servers models.AllServers, err error,
+) {
 	rawMessages := make(map[string]json.RawMessage)
 	if err := json.Unmarshal(b, &rawMessages); err != nil {
 		return servers, fmt.Errorf("decoding servers: %w", err)
@@ -80,7 +82,8 @@ func (s *Storage) extractServersFromBytes(b []byte, hardcodedVersions map[string
 
 func (s *Storage) readServers(provider string, hardcodedVersion uint16,
 	rawMessage json.RawMessage, titleCaser cases.Caser) (servers models.Servers,
-	versionsMatch bool, err error) {
+	versionsMatch bool, err error,
+) {
 	provider = titleCaser.String(provider)
 
 	var versionObject struct {