added source maps

src/foreignthon/transpiler.py

@@ -52,7 +52,7 @@ def transpile(source: str, lang_code: str) -> str:
 
 def transpile_file(path: Path) -> str:
     """
-    Detect language from file extension (.es.py → es),
+    Detect language from file extension (.es.py -> es),
     read the file, and return transpiled Python source.
     """
     lang_code = _detect_lang(path)
@@ -64,8 +64,33 @@ def transpile_file(path: Path) -> str:
     return transpile(source, lang_code)
 
 
+def run_transpiled(original_path: Path, transpiled: str) -> None:
+    """
+    Execute transpiled source while making tracebacks point
+    to the original .es.py file, not a temp file.
+    """
+    import linecache
+
+    filename = str(original_path.resolve())
+
+    # Register original source lines so traceback displays them correctly
+    original_lines = original_path.read_text(encoding="utf-8").splitlines(keepends=True)
+    linecache.cache[filename] = (
+        len(original_lines),
+        None,
+        original_lines,
+        filename,
+    )
+
+    # Compile with original filename — this is what sets it in the traceback
+    code = compile(transpiled, filename, "exec")
+
+    glob = {"__file__": filename, "__name__": "__main__"}
+    exec(code, glob)
+
+
 def _detect_lang(path: Path) -> str:
-    """Extract lang code from extension, e.g. script.es.py → es."""
+    """Extract lang code from extension, e.g. script.es.py -> es."""
     suffixes = path.suffixes  # e.g. ['.es', '.py']
     if len(suffixes) >= 2 and suffixes[-1] == ".py":
         return suffixes[-2].lstrip(".")