improved CLI

Used argparse to create an improved CLI, now supports starting the repl from the greenberry CLI.

src/greenberry/main.py

@@ -4,18 +4,46 @@
 @author: ARJ
 """
 
-import os
+from argparse import ArgumentParser, Namespace
 import sys
+import os
 
 from greenberry.gb import greenberry_eval
+from greenberry.repl import run_repl
 
 
 def main():
-    if len(sys.argv) == 2:
-        with open(os.path.join(os.getcwd(), sys.argv[1])) as f:
-            x = f.read()
-
-        greenberry_eval(x)
+    """
+    The command line will take in two arguments, any combination of either a script name or a `repl` argument.
+    First any provided scripts are executed, then the repl is run (if the `-repl` argument has been provided)
+    If it has, the repl will operate in the same namespace as the executed program.
+    """
+    arg_parser = ArgumentParser(
+        prog="Green Berry",
+        description="A one line statement programming language.",
+        epilog="https://github.com/Abdur-rahmaanJ/greenberry",
+    )
+    arg_parser.add_argument(
+        "scriptname",
+        nargs="*",
+        type=str,
+        help="The name of the script you want to run",
+    )
+    arg_parser.add_argument(
+        "-repl",
+        action="store_true",
+        help="Will start a repl after the program has completed, with the program namepsace.",
+    )
+
+    namespace: Namespace = arg_parser.parse_args(sys.argv[1:])
+
+    if namespace.scriptname:
+        with open(namespace.scriptname, "r") as f:
+            for line in f.readlines():
+                greenberry_eval(line)
+
+    if namespace.repl:
+        run_repl()
 
 
 if __name__ == "__main__":

src/greenberry/repl.py

@@ -5,24 +5,36 @@
 """
 from greenberry.gb import greenberry_eval
 
-print(
-    """
-      ---greenberry(c)---
-      welcome to the .gb REPL
-      ---greenberry(c)---
-      """
-)
-isSessionOn = 1
-while isSessionOn == 1:
-    x = input("---> ")
-    greenberry_eval(x)
-    if x == "berry exit":
-        isSessionOn = 0
-    print()
-print(
-    """
-      ---greenberry(c)---
-      .gb REPL exited. see you soon _ _
-      ---greenberry(c)---
-      """
-)
+
+def run_repl():
+    print(
+        """
+  ---greenberry(c)---
+  welcome to the .gb REPL
+  ---greenberry(c)---
+  """
+    )
+    try:
+        while True:
+            x = input("---> ")
+            if x == "berry exit":
+                break
+
+            greenberry_eval(x)
+
+            print()
+
+    except KeyboardInterrupt:
+        pass
+
+    print(
+        """
+  ---greenberry(c)---
+  .gb REPL exited. see you soon _ _
+  ---greenberry(c)---
+  """
+    )
+
+
+if __name__ == "__main__":
+    run_repl()