Added start up file execution, configurable prompt.

sallyforth/sallyforth.py

@@ -1,6 +1,19 @@
+import os
 from kernel import Forth
+from lex import tokenize
+
+
+source_dir = os.path.dirname(os.path.abspath(__file__))
+startup_file = f'{source_dir}/startup.sf'
+print(startup_file)
 
 f = Forth()
-while True:
-    f.process_line()
 
+if os.path.exists(startup_file):
+    f.execute_file(startup_file)
+
+while True:
+    p = f.evaluate_token('*prompt*')
+    line = input(p)
+    tokens = tokenize(line)
+    f.execute_tokens(tokens)

sallyforth/startup.sf

@@ -0,0 +1,10 @@
+"Executing " . *source* . nl
+
+: prompt "Yo> " ;
+
+: hello (simple greeting) "Hello" . nl ;
+
+: >0 0 > ;
+: <0 0 < ;
+
+: p dup . nl ;

sallyforth/words.py

@@ -1,4 +1,5 @@
 from compiler import Compiler
+import importlib
 
 def execute_f(name, instructions):
     # print("execute_f:", len(instructions))
@@ -32,6 +33,17 @@ def const_f(value):
         return 1
     return x
 
+def w_import(f):
+    name = f.stack.pop()
+    m = importlib.import_module(name)
+    f.stack.push(m)
+
+def w_def(f):
+    value = f.stack.pop()
+    name = f.stack.pop()
+    f.defvar(name, value)
+    print('name', name, 'value', value)
+
 def w_gt(f):
     a = f.stack.pop()
     b = f.stack.pop()