How to use MinecraftForge/MCPConfig with 1.13-pre3
This tutorial aims to instruct those interested individuals on how to generate partial Minecraft sources for snapshots using the MCPConfig SRG mappings provided by the MinecraftForge team.
Many, many thanks to LexManos for selflessly being the sole maintainer of MCPConfig, he truly is a code god. <3 Without him this would not be possible.
I am not a part of the MinecraftForge team nor the MCP team. Proceed at your own risk. This may not be the intended use for the referenced project(s). But aside from all that, I have gotten it to work as described below. For simple tasks it should be sufficient. I got much of my information just by looking at the scripts provided with the latest MCP release, mcp940.zip.