Incorrect programming language reported for a config.h.in file

[pombredanne]

FileName: ./config.h.in
IsSource: True
IsScript: False
ProgLanguage: JavaScript+Lasso

From https://raw.githubusercontent.com/vysheng/tg/master/config.h.in
if I upgrade pygments to 2.2.0 the programming language is "Rexx"
We need to supplement this with a file name and extension registry: after all config.h.in is kinda well known autotools pattern

This is also closely related to #426

Reported by tglx

[pombredanne]

This is now reported as "ASCII text" which is quite acceptable given that this is a generated file.

[D-lang14]

Hey!! @pombredanne I want to help you with this issue. May I know what I should do about that? Give me a chance that I could understand the system and the issue.

[pombredanne]

@D-lang14 sorry for the late reply.
The key issue is that we are putting too much emphasis on using Pygments and libmagic to detect programming langauges.
A config.h should ALWAYS be reported as C/C++
So this would consists in:

1. study the way we detect and report types in typecode
2. in particular check out our we use a registry of extensions
3. evolve the way we report programming languages to work first (and only?) from the registry for some cases