Add standard library and preload command line parameter

rforth.py

@@ -1,3 +1,4 @@
+import argparse
 stack = []
 compiling = False
 words = {}
@@ -201,11 +202,24 @@ def add_to_stack(value):
     stack.insert(0, int(value))
 
 
-def main():
+def main(args):
+    if args.preload != None:
+        f = open(args.preload, "r")
+        file_data = f.readlines()
+        preload = []
+        for line in file_data:
+            split_line = line.split(' ')
+            for word in split_line:
+                preload.append(word)
+        parse_input(preload, False)
+        f.close()
     print("Welcome to rforth!")
     while True:
         i = get_input()
         parse_input(i.split(' '))
 
 if __name__ == "__main__":
-        main()
+    parser = argparse.ArgumentParser(description='A weird little Forth implementation')
+    parser.add_argument('-p', '--preload', default="standard-library.f", type=str, help='A file to preload')
+    args = parser.parse_args()
+    main(args)

standard-library.f

@@ -0,0 +1,2 @@
+: loop 1 swap - 2dup . 0 = if else loop then ; 
+: loop2 2 swap - 2dup . 0 = if else loop2 then ;