auto generate C++ wrappers for C libraries using ctags

cppgen.py

import sys
import subprocess

start = sys.argv[2]
ty = sys.argv[3]
newty = sys.argv[4]

cmd = "ctags -x --c-kinds=f --_xformat=\"%N %S\" " + sys.argv[1]
output = subprocess.check_output(cmd, stderr=subprocess.STDOUT).decode('utf-8')
fns = output.split("\n")

print("struct", newty, " {")
print("   ", ty, "_impl;")
print()

for fn in fns:
    fns = fn.split(" ", 1)
    if len(fns) != 2:
        continue
    name = fns[0]
    args = fns[1].split("(", 1)[1].split(")", 1)[0].strip().split(",")

    if not name.startswith(start):
        continue

    isconst = args[0].startswith("const " + ty)
    if not (args[0].startswith(ty) or isconst):
        continue

    newname = name[len(start):]

    print("    inline auto", newname + "(" + ", ".join(args[1:]) + ")", "const {" if isconst else "{")
    print("        return", name + "(_impl, " + ",".join([v.split(" ")[-1] for (i, v) in enumerate(args[1:])]) + ");")
    print("    }")
    print()

print("};")