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#!/usr/bin/env python3
import os
import re
import argparse
class EOFException(Exception):
pass
class Instruction():
def __init__(self, string: str):
# TODO handle quoting and escapments
keywords = string.split()
self.prog = keywords[0]
self.arguments = keywords[1:]
def execute(self):
cpid = os.fork()
if cpid == 0:
os.execvp(self.prog, [self.prog] + self.arguments)
else:
os.waitpid(cpid, 0)
def read_instruction(fh):
# TODO We should be reading an instruction, not a line.
while True:
line = fh.readline()
if line == "":
raise EOFException()
line = line.strip()
# We ignore empty lines and lines which start with #
if not line.startswith("#") and not line == "":
break
return Instruction(line)
def main(arguments):
for script in arguments["<script>"]:
with open(script, mode="r", encoding="utf-8") as fh:
while True:
try:
instruction = read_instruction(fh)
instruction.execute()
except EOFException:
break
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Command interpreter written in Python.")
parser.add_argument("<script>", action="store", nargs="+", help="Script to run")
args = parser.parse_args()
main(vars(args))
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