remove unknown patches

config.go

@@ -12,10 +12,11 @@ import (
 )
 
 type Config struct {
-	WowDir         string
-	LaunchCmd      string
-	WinePrefix     string
-	EnableLauncher bool
+	WowDir               string
+	LaunchCmd            string
+	WinePrefix           string
+	EnableLauncher       bool
+	RemoveUnknownPatches bool
 }
 
 const (
@@ -36,9 +37,10 @@ func setupConfig(rerun bool) (*Config, error) {
 	cfgPath = filepath.Join(home, ".config", configDirName, configName)
 
 	newConfig := Config{
-		WowDir:         defaultWowPath,
-		LaunchCmd:      defaultLaunchCmd,
-		EnableLauncher: false,
+		WowDir:               defaultWowPath,
+		LaunchCmd:            defaultLaunchCmd,
+		EnableLauncher:       false,
+		RemoveUnknownPatches: true,
 	}
 
 	_, statErr := os.Stat(cfgPath)

main.go

@@ -6,11 +6,13 @@ import (
 	"flag"
 	"fmt"
 	"io"
+	"io/fs"
 	"log"
 	"net/http"
 	"os"
 	"os/exec"
 	"path/filepath"
+	"regexp"
 	"strings"
 )
 
@@ -175,5 +177,40 @@ func downloadUpdate(config *Config, force bool) (DownloadStats, error) {
 		stats.updated += 1
 	}
 
+	if config.RemoveUnknownPatches {
+		patches := make([]string, 0)
+		patchreg := regexp.MustCompile(`patch-[A-Za-z].MPQ`)
+
+		for _, file := range manifest.Files {
+			if patchreg.MatchString(file.Path) {
+				patches = append(patches, strings.Split(file.Path, "Data\\")[1])
+			}
+		}
+
+		err = filepath.WalkDir(filepath.Join(config.WowDir, "Data"), func(path string, d fs.DirEntry, err error) error {
+			if !d.IsDir() && patchreg.MatchString(d.Name()) {
+				del := true
+				for _, patch := range patches {
+					if patch == d.Name() {
+						del = false
+						break
+					}
+				}
+				if del {
+					err = os.Remove(path)
+					if err != nil {
+						return err
+					}
+					fmt.Println("Removed unknown patch", d.Name())
+				}
+			}
+			return nil
+		})
+
+		if err != nil {
+			log.Fatalf("failed to delete unknown patches: %s", err)
+		}
+	}
+
 	return stats, nil
 }