Add resumable downloads, download paths, queue controls and history

internal/preferences/store.go

@@ -6,9 +6,10 @@ import (
 	"fmt"
 	"io/fs"
 	"os"
-	"path/filepath"
 	"slices"
 	"sync"
+
+	"ddc/internal/files"
 )
 
 type Store struct {
@@ -47,6 +48,10 @@ func (store *Store) Get() Preferences {
 	if current.AllowedPorts == nil {
 		current.AllowedPorts = []uint16{}
 	}
+	current.DownloadPaths = slices.Clone(current.DownloadPaths)
+	if current.DownloadPaths == nil {
+		current.DownloadPaths = []string{}
+	}
 	return current
 }
 
@@ -61,27 +66,9 @@ func (store *Store) Update(next Preferences) error {
 
 	store.mutex.Lock()
 	defer store.mutex.Unlock()
-	if err := writeAtomically(store.path, data); err != nil {
+	if err := files.WriteAtomically(store.path, data); err != nil {
 		return err
 	}
 	store.current = next
 	return nil
 }
-
-func writeAtomically(path string, data []byte) error {
-	temporary, err := os.CreateTemp(filepath.Dir(path), ".settings-*.tmp")
-	if err != nil {
-		return err
-	}
-	_, writeErr := temporary.Write(data)
-	closeErr := temporary.Close()
-	if writeErr != nil || closeErr != nil {
-		os.Remove(temporary.Name())
-		return errors.Join(writeErr, closeErr)
-	}
-	if err := os.Rename(temporary.Name(), path); err != nil {
-		os.Remove(temporary.Name())
-		return err
-	}
-	return nil
-}