Finalized Modpack installation.

fclauncher/InstanceManager.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"net/http"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -488,6 +489,8 @@ func (i *InstanceManager) ImportModpack(modpack Modpack, name string) {
 }
 
 func (i *InstanceManager) ImportMrpack(data io.Reader, name string) {
+	dir, _ := os.UserConfigDir()
+	InstancePath := filepath.Join(dir, "FCLauncher", "instances", name, "minecraft")
 	zr := zipstream.NewReader(data)
 	mrdata := MrData{}
 	for {
@@ -499,7 +502,22 @@ func (i *InstanceManager) ImportMrpack(data io.Reader, name string) {
 			file, _ := entry.Open()
 			data, _ := io.ReadAll(file)
 			json.Unmarshal(data, &mrdata)
-			break
+		} else {
+			prefix := strings.Split(entry.Name, "/")[0]
+			if prefix == "overrides" || prefix == "client-overrides" {
+				path := strings.SplitN(entry.Name, "/", 2)[1]
+				if entry.IsDir() {
+					if _, err := os.Stat(filepath.Join(InstancePath, path)); err != nil {
+						os.MkdirAll(filepath.Join(InstancePath, path), 0755)
+					}
+				} else {
+					zf, _ := entry.Open()
+					defer zf.Close()
+					file, _ := os.OpenFile(filepath.Join(InstancePath, path), os.O_CREATE|os.O_RDWR, 0755)
+					defer file.Close()
+					io.Copy(file, zf)
+				}
+			}
 		}
 	}
 	fmt.Printf("Installing minecraft %s\n", mrdata.Dependencies["minecraft"])
@@ -517,4 +535,27 @@ func (i *InstanceManager) ImportMrpack(data io.Reader, name string) {
 		fmt.Printf("Installing quilt %s\n", mrdata.Dependencies["quilt-loader"])
 		i.InstallQuilt(name, mrdata.Dependencies["quilt-loader"])
 	}
+
+	for _, f := range mrdata.Files {
+		fmt.Printf("Downloading %s\n", f.Path)
+		resp, err := http.Get(f.Downloads[0])
+		if err != nil {
+			fmt.Printf("Unable to download file %s\n", err)
+			continue
+		}
+		defer resp.Body.Close()
+		fileDir := ""
+		tokens := strings.Split(f.Path, "/")
+		for ind, token := range tokens {
+			if ind != len(tokens)-1 {
+				fileDir = filepath.Join(fileDir, token)
+			}
+		}
+		if _, err := os.Stat(filepath.Join(InstancePath, fileDir)); err != nil {
+			os.MkdirAll(filepath.Join(InstancePath, fileDir), 0755)
+		}
+		file, _ := os.OpenFile(filepath.Join(InstancePath, f.Path), os.O_CREATE|os.O_RDWR, 0755)
+		defer file.Close()
+		io.Copy(file, resp.Body)
+	}
 }