♻ | New project structure

transmutate_app/__main__.py

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+"""Allow running transmutate_app as a module: python -m transmutate_app <file>."""
+
+import sys
+import os
+from .gui import open_file
+
+
+def main():
+    """CLI entry point for ``python -m transmutate_app <file>``."""
+    if len(sys.argv) < 2:
+        print("Usage: python -m transmutate_app <path/to/file>")
+        sys.exit(1)
+
+    filepath = sys.argv[1]
+    if not os.path.isfile(filepath):
+        print(f"Error: File does not exist: {filepath}", file=sys.stderr)
+        sys.exit(1)
+
+    open_file(filepath)