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-rwxr-xr-xvish.py57
1 files changed, 57 insertions, 0 deletions
diff --git a/vish.py b/vish.py
new file mode 100755
index 0000000..a8febc3
--- /dev/null
+++ b/vish.py
@@ -0,0 +1,57 @@
+#!/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))