commit 9c93b1bf10db1ee61d343a9c0928921bc46fe5ef
Author: Fierelier <fierelier@gmail.com>
Date:   Sun Mar 28 00:10:28 2021 +0100

    first commit

diff --git a/minecraftLauncher.py b/minecraftLauncher.py
new file mode 100644
index 0000000..8e82b3d
--- /dev/null
+++ b/minecraftLauncher.py
@@ -0,0 +1,113 @@
+#!/usr/bin/env python3
+import sys
+
+oldexcepthook = sys.excepthook
+def newexcepthook(type,value,traceback):
+	oldexcepthook(type,value,traceback)
+	input("Press ENTER to quit.")
+sys.excepthook = newexcepthook
+
+import os
+p = os.path.join
+pUp = os.path.dirname
+s = False
+if getattr(sys, 'frozen', False) and hasattr(sys, '_MEIPASS'):
+	s = os.path.realpath(sys.executable)
+else:
+	s = os.path.realpath(__file__)
+sp = pUp(s)
+
+import subprocess
+import json
+import hashlib
+import platform
+p = os.path.join
+os.environ["appdata"] = p(sp,"appdata")
+java = p(sp,"java","bin","java.exe")
+jvmArguments = ["-Xms256M","-Xmx800M"]
+osName = platform.system().lower()
+if osName == "darwin": osName = "macos"
+
+def readJsonFile(file):
+	fileh = open(file,"r")
+	data = fileh.read()
+	fileh.close()
+	return json.loads(data)
+
+def main():
+	global version
+	global name
+	global osName
+	if len(sys.argv) > 1:
+		for arg in sys.argv[1:]:
+			argSplit = arg.split("=",1)
+			if len(argSplit) > 1:
+				globals()[argSplit[0]] = argSplit[1]
+	
+	if not osName in ["windows","linux","macos"]:
+		print("Warning, unsupported OS detected: " +osName)
+		print("Needs to be either windows, linux or macos. Define it with osName=name in the commandline.")
+		print("")
+	if not "version" in globals(): version = input("Version ID: ")
+	if not "name" in globals(): name = input("Player name: ")
+	
+	gamePath = p(os.environ["appdata"],".minecraft")
+	versionPath = p(gamePath,"versions",version)
+	libraryPath = p(gamePath,"libraries")
+	nativesPath = p(gamePath,"natives")
+	nativesOutPath = p(versionPath,"natives")
+	assetsPath = p(gamePath,"assets")
+	
+	print("Extracting natives...")
+	clientJson = readJsonFile(p(versionPath,version + ".json"))
+	libraryList = ""
+	for library in clientJson["libraries"]:
+		if "artifact" in library["downloads"]:
+			library["downloads"]["artifact"]["path"] = library["downloads"]["artifact"]["path"].replace("/",os.path.sep)
+			libraryList += p(libraryPath,library["downloads"]["artifact"]["path"]) + ";"
+		if "classifiers" in library["downloads"]:
+			if "natives-" +osName in library["downloads"]["classifiers"]:
+				native = library["downloads"]["classifiers"]["natives-" +osName]
+				native["path"] = native["path"].replace("/",os.path.sep)
+				if not os.path.isdir(nativesOutPath): os.makedirs(nativesOutPath)
+				subprocess.run(["7z","x",p(nativesPath,native["path"]),"-o" +nativesOutPath,"-aos"],check=True,stdout=subprocess.DEVNULL)
+	
+	libraryList += p(versionPath,version + ".jar")
+	#print(libraryList)
+	
+	launcherVariables = {}
+	launcherVariables["auth_player_name"] = name
+	launcherVariables["version_name"] = version
+	launcherVariables["game_directory"] = gamePath
+	launcherVariables["assets_root"] = assetsPath
+	launcherVariables["assets_index_name"] = clientJson["assets"]
+	launcherVariables["auth_access_token"] = "-"
+	launcherVariables["auth_uuid"] = hashlib.md5(name.encode('utf-8')).hexdigest()
+	launcherVariables["user_type"] = "offline"
+	launcherVariables["version_type"] = clientJson["type"]
+	
+	args = jvmArguments
+	args.append("-Djava.library.path=" +nativesOutPath)
+	args.append("-cp")
+	args.append(libraryList)
+	args.append(clientJson["mainClass"])
+	
+	if "arguments" in clientJson:
+		for arg in clientJson["arguments"]["game"]:
+			if type(arg) != str: continue
+			for var in launcherVariables:
+				arg = arg.replace("${" +var+ "}",launcherVariables[var])
+			args.append(arg)
+	elif "minecraftArguments" in clientJson:
+		margs = clientJson["minecraftArguments"].replace('"',"").split(" ")
+		for arg in margs:
+			if type(arg) != str: continue
+			for var in launcherVariables:
+				arg = arg.replace("${" +var+ "}",launcherVariables[var])
+			args.append(arg)
+	
+	print("Launching Minecraft...")
+	subprocess.call([java] + args)
+
+
+main()
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