Experimental alternative installation technique to pynsist.

Author: tarehart

alternative-install/README.md

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+To create an installer from this, bat2exe from https://www.bat2exe.net/ and run it on this directory.
+You'll end up with an exe file which people can use to install / run.

alternative-install/RLBotGUI.bat

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+@echo off
+
+echo Installing RLBotGUI if necessary, then launching!
+
+py -3.7 --version
+
+rem If python 3.7 is not installed, then the above py command will cause a non-zero error level.
+
+if %ERRORLEVEL% GTR 0 (
+
+  rem Download a python installer from python.org.
+
+  if not exist python-install.exe (
+    mkdir %LocalAppData%\RLBotGUIX\
+    powershell -Command "Invoke-WebRequest https://www.python.org/ftp/python/3.7.7/python-3.7.7-amd64.exe -OutFile %LocalAppData%\RLBotGUIX\python-installer.exe"
+  )
+
+  rem Go ahead and install the specific version of python we want.
+  rem We have selected options which will not modify the user's PATH
+  rem If the user already has 3.7 installed but the py command was not available or could not find it,
+  rem the installation will be modified, which will probably not cause trouble for anyone.
+
+  %LocalAppData%\RLBotGUIX\python-installer.exe /passive InstallAllUsers=0 Shortcuts=0 Include_doc=0 Include_dev=0 Include_launcher=1 InstallLauncherAllUsers=0 PrependPath=0
+)
+
+rem Create a virtual environment which will isolate our package installations from any
+rem existing python installation that the user may have.
+
+if not exist %LocalAppData%\RLBotGUIX\venv\Scripts\python.exe (
+  py -3.7 -m venv %LocalAppData%\RLBotGUIX\venv
+)
+
+set rlbotpy=%LocalAppData%\RLBotGUIX\venv\Scripts\python.exe
+
+rem Install and / or upgrade RLBot components
+
+%rlbotpy% -m pip install --upgrade pip
+%rlbotpy% -m pip install eel
+%rlbotpy% -m pip install --upgrade rlbot_gui rlbot
+
+rem Launch the GUI
+
+%rlbotpy% -c "from rlbot_gui import gui; gui.start()"