No, the desired behaviour is to follow a link to a github code section, e.g. https://github.com/splicebox/PsiCLASS/blob/04e2a118c1820f802... and then copy that into the editor with syntax highlighting and line numbers. I can copy it myself, but it would be nice to have a plugin to make things look nice. Additionally, it would be nice to preserve the link so that readers can jump straight to the relevant section of the codebase.