Started https download code

fclauncher/Prism.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+)
+
+type Prism struct {
+	Instances []Instance
+}
+
+type Instance struct {
+	Path    string
+	Name    string
+	MCVer   string
+	JavaVer string
+}
+
+func (Prism) CheckInstalled() bool {
+	path, _ := os.UserConfigDir()
+	_, err := os.Stat(filepath.Join(path, "FCLauncher", "prism"))
+	if err == nil {
+		return true
+	} else {
+		return false
+	}
+}
+
+func (Prism) Install() {
+
+}

fclauncher/app.go

@@ -1,16 +1,17 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"fmt"
 	"io"
-	"net/http"
 )
 
 // App struct
 type App struct {
-	ctx context.Context
+	ctx   context.Context
+	prism Prism
 }
 
 type Modpack struct {
@@ -36,12 +37,12 @@ func (a *App) Greet(name string) string {
 }
 
 func (a *App) GetModpacks() []string {
-	res, err := http.Get("https://gitea.piwalker.net/fclauncher/modpacks.json")
+	buff := new(bytes.Buffer)
+	err := HttpDownload("modpacks.json", buff)
 	if err != nil {
-		fmt.Println(err.Error())
+		fmt.Println(err)
 	}
-	defer res.Body.Close()
-	body, err := io.ReadAll(res.Body)
+	body, err := io.ReadAll(buff)
 	var modpacks []Modpack
 	err = json.Unmarshal([]byte(body), &modpacks)
 	if err != nil {
@@ -56,5 +57,14 @@ func (a *App) GetModpacks() []string {
 }
 
 func (a *App) CheckPrerequisites() {
-
+	a.prism = Prism{}
+	res := a.prism.CheckInstalled()
+	fmt.Printf("Checking if prism is installed: ")
+	if res {
+		fmt.Println("Yes")
+	} else {
+		fmt.Println("No")
+		fmt.Println("Installing Prism")
+		a.prism.Install()
+	}
 }

fclauncher/https.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+)
+
+const BlockSize = 1024
+
+func HttpDownload(path string, out io.Writer) error {
+	res, err := http.Get("https://gitea.piwalker.net/fclauncher/" + path)
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+	var read int64 = 0
+	for read < res.ContentLength {
+		count, err := io.CopyN(out, res.Body, BlockSize)
+		read += count
+		fmt.Printf("Downloaded %dMB / %dMB\n", read/(1024*1024), res.ContentLength/(1024*1024))
+		if err != nil {
+			break
+		}
+	}
+	return nil
+}