feat: sort obj list

internal/model/obj.go

@@ -2,6 +2,8 @@ package model
 
 import (
 	"io"
+	"sort"
+	"strings"
 	"time"
 )
 
@@ -30,3 +32,52 @@ type Thumbnail interface {
 type SetID interface {
 	SetID(id string)
 }
+
+func SortFiles(objs []Obj, orderBy, orderDirection string) {
+	if orderBy == "" {
+		return
+	}
+	sort.Slice(objs, func(i, j int) bool {
+		switch orderBy {
+		case "name":
+			{
+				c := strings.Compare(objs[i].GetName(), objs[j].GetName())
+				if orderDirection == "DESC" {
+					return c >= 0
+				}
+				return c <= 0
+			}
+		case "size":
+			{
+				if orderDirection == "DESC" {
+					return objs[i].GetSize() >= objs[j].GetSize()
+				}
+				return objs[i].GetSize() <= objs[j].GetSize()
+			}
+		case "updated_at":
+			if orderDirection == "DESC" {
+				return objs[i].ModTime().After(objs[j].ModTime())
+			}
+			return objs[i].ModTime().Before(objs[j].ModTime())
+		}
+		return false
+	})
+}
+
+func ExtractFolder(objs []Obj, extractFolder string) {
+	if extractFolder == "" {
+		return
+	}
+	front := extractFolder == "front"
+	sort.SliceStable(objs, func(i, j int) bool {
+		if objs[i].IsDir() || objs[j].IsDir() {
+			if !objs[i].IsDir() {
+				return !front
+			}
+			if !objs[j].IsDir() {
+				return front
+			}
+		}
+		return false
+	})
+}