1 files changed, 38 insertions, 3 deletions
diff --git a/vish.py b/vish.py
index 8d8f6e1..43c4090 100755
--- a/vish.py
+++ b/vish.py
@@ -30,12 +30,20 @@ class Pipeline():
 
 
 class Instruction():
-    def __init__(self, tokens: list=[], stdout=None, stderr=None):
-        self.prog = tokens[0]
-        self.args = tokens[1:]
+    def __init__(self, stdout=None, stderr=None):
         self.stdout = stdout
         self.stderr = stderr
 
+    def execute(self):
+        pass
+
+
+class Command(Instruction):
+    def __init__(self, prog: str, args: list=[], **kwargs):
+        super().__init__(**kwargs)
+
+        self.prog = prog
+        self.args = args
 
     def execute(self):
         cpid = os.fork()
@@ -53,6 +61,33 @@ class Instruction():
             return status
 
 
+class Builtin(Instruction):
+    def __init__(self, function, args: list=[], **kwargs):
+        super().__init__(**kwargs)
+
+        self.function = function
+        self.args = args
+
+    def execute(self):
+        # TODO Rewrite using with statements
+        if self.stdout is not None:
+            stdout = open(self.stdout, mode="w", encoding="utf-8")
+        else:
+            stdout = sys.stdout
+
+        if self.stderr is not None:
+            stderr = open(self.stderr, mode="w", encoding="utf-8")
+        else:
+            stderr = sys.stderr
+
+        try:
+            self.function(self.args, stdout=stdout)
+        except Exception as e:
+            print(e.__repr__(), file=stderr)
+            return 1
+        return 0
+
+
 class AndInstruction(Instruction):
     def __init__(self, instruction1: Instruction, instruction2: Instruction):
         self.instruction1 = instruction1