add line-running and noop cmd

examples/hello.scri

@@ -1 +1 @@
-noop
+noop;

scritcher/executer.py

@@ -0,0 +1,28 @@
+import shlex
+
+
+class InterpreterError(Exception):
+    pass
+
+
+class Interpreter:
+    """Interpreter for scritcher instructions/statements."""
+    def __init__(self):
+        pass
+
+    def _cmd_noop(self):
+        pass
+
+    def run(self, line: str):
+        """Run a single line."""
+        print(f'running {line!r}')
+
+        args = shlex.split(line)
+        command = args[0]
+
+        try:
+            method = getattr(self, f'_cmd_{command}')
+        except AttributeError:
+            raise InterpreterError(f'Command {command!r} not found')
+
+        method(*args[1:])

scritcher/main.py

@@ -1,11 +1,28 @@
 import sys
 from pathlib import Path
 
+from .executer import Interpreter, InterpreterError
+
 def main():
     try:
         scri_path = Path(sys.argv[1]).resolve()
     except IndexError:
         print(f'usage: {sys.argv[0]} path/to/file.scri')
         return
-    print('path', scri_path)
-    #run(scri_path)
+
+    full_text = scri_path.read_text()
+    full_text = full_text.replace('\n', '')
+    stmts = full_text.split(';')
+
+    interp = Interpreter()
+
+    try:
+        for stmt in stmts:
+            if not stmt:
+                continue
+
+            interp.run(stmt)
+    except InterpreterError as err:
+        print(f'Interpreter error. {err.args[0]!r}')
+
+    print('OK')