First public commit.

lenser/pet/exporter.py

@@ -0,0 +1,16 @@
+"""Build a Commodore PET .prg (loaded + run via MAME quickload / on real HW)."""
+from __future__ import annotations
+
+from .viewer import assemble
+
+_EXTS = (".prg", ".p00")
+
+
+def export_prg(conv, output_path, source_path=None, display="forever",
+               seconds=0, video="ntsc"):
+    if not output_path.lower().endswith(_EXTS):
+        output_path += ".prg"
+    prg = assemble.build_prg(bytes(conv.data))
+    with open(output_path, "wb") as f:
+        f.write(prg)
+    return output_path