Command line option `--language csharp` will cause an error about bat

[keith-hall]

Markdown allows to use csharp as a language specifier token, but that's because it has a special rule for it. I believe bat by default expects you to use C# to refer to the CSharp syntax.
I'm not at a computer right now to verify, but try

echo "using System;" | bat -l 'C#'

EDIT: confirmed that the above works.
I agree that it would be nice if the bat language argument on the command line would also work with the Markdown language tokens, but that would take quite a lot of re-working/duplication and maintenance and in some cases where ambiguity could ensue, could cause confusion.

Perhaps a simpler solution would be (if you never look at Java code for example), to update the first_line_match for the C#.sublime-syntax to match on using System;, then you wouldn't even need the language specifier. (See https://github.com/sharkdp/bat/blob/master/README.md#adding-new-syntaxes--language-definitions for details on how to do that.)