lua.glslang.parse_chunks

shaders=glslang.shader_chunks(text,filename,headers,flags)

    load multiple shader chunks from a single file and return a lookup
    table of name=code for each shader we just loaded. These can then be
    compiled or whatever.
    
    set flags.headers_only to true if you only care about parsing headers
    for later inclusion and do not want to parse shader chunks.
    

#SHADER "nameofshader"

    is used at the start of a line to say which chunk the following text
    should go into. This is technically the same as #header but makes it
    explicit that this should be all the code for a shader rather than just
    a piece.

#HEADER "nameofheader"

    can be used to define part of a shader, which can later be included in
    another shader by using

#INCLUDE "nameofheader"

    Will insert the chunk of text previously defined as a #SHADER or #HEADER

#SHADER or #HEADER

    without a name can be used to ignore the next part of a file, any text
    at the start of a file before the first #SHADER or #HEADER is also
    ignored. This enables these chunks to exist inside comments in a lua or
    whatever file.