Opengrok treats C++ STL header file as plain text

[TooYoungTooSimp]

I'm using opengrok to index some stl implements for learning.
But I find opengrok treats all stl headers as plain text (algorithm,set,map and etc).
So I'm wondering if there's a way to let opengrok treats no suffix text file as cpp header file?
Thanks for your help.

[vladak]

Depends on the suffix of these files:

opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/analysis/c/CxxAnalyzerFactory.java

Lines 32 to 42 in 6364b31

	private static final String[] SUFFIXES = {
	"CPP",
	"HPP",
	"CC",
	"C++",
	"HH",
	"CXX",
	"HXX",
	"TXX",
	"TCC"
	};

[vladak]

If the file in question has one of these suffixes, attach reproducible test case please.

[TooYoungTooSimp]

Unfortunately, C++ STL headers have no suffix.
https://github.com/microsoft/STL/tree/main/stl/inc
https://github.com/llvm/llvm-project/tree/main/libcxx/include
As we can see, stl headers (like algorithm, vector, set, map, queue) are all have no suffix.
That's why I'm wondering how to index them.

[vladak]

I don't think there is a way currently how to make this work. Either the -A specification needs to be extended to paths or the matching needs to be much more flexible.

[TooYoungTooSimp]

I found the 'file' utility can successfully identify stl header as c source

Is it possible to integrate this to opengrok? Or directly use libmagic instead?

[vladak]

straceing the file utility reveals that it reads the file whole (it reads 1 MiB of the file in fact, at least on my system). We definitely want to avoid that - the classification of a file should be fast. Maybe the AnalyzerGuru could perform some quick analysis based on some predefined chunk of the file however that sounds like an overhaul.

[TooYoungTooSimp]

Maybe we can use the existing file type analyzer first. When a file has no file extension, then use file to distinguish its type. (So use file just as a addition)

Is that possible?