#!/usr/bin/env python3

import json
import sys

def compileCommandSelector(x):
   return not ("extern" in x["file"])

if __name__ == "__main__":
   if (len(sys.argv) != 2):
      print("usage: ./filterCompileCommands.py compile_commands.json")
      exit(-1)

   filename = sys.argv[1]
   print("loading compile commands file: {}".format(filename))

   fin = open(filename, "r")
   cc = json.load(fin)
   fin.close()

   print("compile commands read: {}".format(len(cc)))

   cc_filtered = list( filter(compileCommandSelector, cc) )

   print("compile commands filtered: {}".format(len(cc_filtered)))

   fout = open(filename, "w")
   json.dump(cc_filtered, fout)
   fout.close()