Added project files

Main.go

@@ -0,0 +1,150 @@
+package main
+
+import (
+	"errors"
+	"github.com/ncruces/zenity"
+	"io"
+	"io/fs"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+const url = "https://github.com/mircokroon/minecraft-world-downloader/releases/latest/download/world-downloader.jar"
+const jarFile = "world-downloader.jar"
+const jarFileDownloading = jarFile + ".downloading"
+
+const gameRuntimeDir = "C:\\Program Files (x86)\\Minecraft Launcher\\runtime\\"
+
+func main() {
+	if !exists(jarFile) {
+		notify("Downloading " + jarFile)
+
+		download()
+		rename()
+	}
+	run()
+}
+
+func exists(path string) bool {
+	_, err := os.Stat(path)
+
+	return !errors.Is(err, os.ErrNotExist)
+}
+
+func download() {
+	file, err := os.Create(jarFileDownloading)
+	defer file.Close()
+	checkError(err)
+
+	response, err := http.Get(url)
+	if response.StatusCode != 200 {
+		checkError(errors.New("Got status code " + strconv.Itoa(response.StatusCode) + " while downloading <" + url + ">"))
+	}
+	defer response.Body.Close()
+	checkError(err)
+
+	_, err = io.Copy(file, response.Body)
+	checkError(err)
+}
+
+func rename() {
+	err := os.Rename(jarFileDownloading, jarFile)
+	checkError(err)
+}
+
+func run() {
+	success := runWithJavaPath("java") || runEach(findJavaHomeSiblings()) || runEach(findJavaExecutables(gameRuntimeDir))
+	if !success {
+		writeLog()
+		checkError(errors.New("cannot find suitable Java version. Make sure one is correctly installed"))
+	}
+}
+
+func runWithJavaPath(java string) bool {
+	log("Trying to run " + java)
+
+	// running the command through cmd and not directly lets us hide the command prompt without hiding the gui as well
+	cmd := exec.Command("cmd.exe", "/C", java, "-jar", jarFile)
+	cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
+	out, err := cmd.CombinedOutput()
+
+	if err == nil {
+		cmd.Wait()
+		return true
+	}
+
+	log("\t" + err.Error())
+	log("\t" + string(out))
+
+	return false
+}
+
+// find JAVA_HOME and go up one folder to find all versions of Java (ideally)
+func findJavaHomeSiblings() []string {
+	env := os.Getenv("JAVA_HOME")
+
+	if env == "" {
+		return nil
+	}
+
+	return findJavaExecutables(filepath.Dir(env))
+}
+
+// find java executables in a given path
+func findJavaExecutables(dir string) []string {
+	options := make([]string, 0)
+	filepath.WalkDir(dir, func(path string, di fs.DirEntry, err error) error {
+		if strings.HasSuffix(path, "java.exe") {
+			options = append(options, path)
+		}
+		return err
+	})
+	return options
+}
+
+func runEach(options []string) bool {
+	for _, option := range options {
+		wasSuccess := runWithJavaPath(option)
+
+		if wasSuccess {
+			return true
+		}
+	}
+	return false
+}
+
+func checkErrorWithMessage(err error, info string) {
+	if err != nil {
+		zenity.Info("An error has occurred: \n\n"+err.Error()+"\n\n"+info,
+			zenity.Title("Error"),
+			zenity.ErrorIcon)
+		os.Exit(1)
+	}
+}
+
+func checkError(err error) {
+	checkErrorWithMessage(err, "")
+}
+
+func notify(msg string) {
+	zenity.Notify(msg, zenity.Title("Minecraft World Downloader"), zenity.InfoIcon)
+}
+
+// log file if unable to start
+var logArr = make([]string, 0)
+
+func writeLog() {
+	f, _ := os.OpenFile("world-downloader-launcher.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+
+	for _, line := range logArr {
+		f.Write([]byte(line + "\n"))
+	}
+}
+func log(str string) {
+	logArr = append(logArr, str)
+}

README.md

@@ -0,0 +1,14 @@
+# Minecraft World Downloader Launcher
+
+Simple launcher application for [Minecraft World Downloader](https://github.com/mircokroon/minecraft-world-downloader).
+
+# Usage
+
+Download and run the latest release: [world-downloader-launcher.exe](https://github.com/mircokroon/minecraft-world-downloader-launcher/releases/latest/download/world-downloader-launcher.exe)
+
+# Building
+
+In the project directory, run:
+```
+go build -ldflags "-H windowsgui"
+```

go.mod

@@ -0,0 +1,14 @@
+module world-downloader-launcher
+
+go 1.21.0
+
+require github.com/ncruces/zenity v0.10.10
+
+require (
+	github.com/akavel/rsrc v0.10.2 // indirect
+	github.com/dchest/jsmin v0.0.0-20220218165748-59f39799265f // indirect
+	github.com/josephspurrier/goversioninfo v1.4.0 // indirect
+	github.com/randall77/makefat v0.0.0-20210315173500-7ddd0e42c844 // indirect
+	golang.org/x/image v0.10.0 // indirect
+	golang.org/x/sys v0.10.0 // indirect
+)

go.sum

@@ -0,0 +1,57 @@
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+github.com/akavel/rsrc v0.10.2/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
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