Lex source files to look for `#![crate_name]` about rrustdoc HOT 2 CLOSED

Yikes, no. We should just use rustc --print=crate-name for robustness.

from rrustdoc.

Actually, we need to parse it ourselves since we also need to look for #![crate_type] for which there does not exist a dedicated --print=crate-type. While there is --print=link-args whose output we could look through trying to find a reference to libproc_macro (OS dependent?), that print request actually forces rustc do compile the given program just until the linking step. This however is the major downside: We have to pass a --crate-type <TYPE> alongside --print=link-args where TYPE ≠ bin since we generally don't have a main function but we don't know TYPE yet, that's exactly the information we're trying to find out! Setting it to lib or proc-macro wouldn't work in general since it will error if the program contains a #![crate_type].

from rrustdoc.