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GitHub appears to auto-detect the project language type. However, it has failed on a couple of mine.
Is there a way to set that manually, or is there some keyword/phrase I should set to trigger it?
I'd presumed it goes by file extension as it properly detects my Modula-2, Propeller Spin, and Java repos. However, it only identifies about half my Assembly repos properly (and they all have .asm files).
You can use a .gitattributes file to add or override filename and extension patterns (or vi/emacs lines).
*.ASM linguist-language=Assembly
Github's code library responsible for file type statistics and syntax highlighting selection is called Linguist. You can open a pull request for a change to languages.yml if you believe that you are not the only one affected by this case sensitivity problem.
Assembly:
type: programming
color: "#6E4C13"
aliases:
- nasm
extensions:
- ".asm"
- ".a51"
- ".inc"
- ".nasm"
tm_scope: source.assembly
ace_mode: assembly_x86
language_id: 24
Appears that it only detects the type properly if the filename extensions are in lower case characters. Several of my old projects go way back from when caps was the standard for full filenames. Creating an empty token file in the GitHub web UI with a lowercase extension of the appropriate type will trick it into displaying the proper language type in the repository screen.
