include.py

#!/usr/bin/env python3

import sys
import re

includereg = re.compile( r"(?s)(```include)(.*?)(```)" )
filenamereg = re.compile( r"([\S]{1,})" )

def includeblocks( instream ):
    outstream = ""

    prev = 0
    for i in includereg.finditer( instream ):
        outstream += instream[prev:i.start()]   

        for f in filenamereg.finditer( i.group(2) ):
            with open( f.group(1), "r" ) as file:
                outstream += includeblocks( file.read() )

        prev = i.end()

    outstream += instream[prev:]

    outstream += "\n\n"

    return outstream


if __name__ == "__main__":
    print( includeblocks( sys.stdin.read() ), file=sys.stdout, end="" )