First public commit.

lenser/a7800/exporter.py

@@ -0,0 +1,19 @@
+"""Build an Atari 7800 cartridge (.a78) from a conversion."""
+from __future__ import annotations
+
+import os
+
+from .viewer import assemble
+
+_EXTS = (".a78", ".bin")
+
+
+def export_a78(conv, output_path, source_path=None, display="forever",
+               seconds=0, video="ntsc"):
+    if not output_path.lower().endswith(_EXTS):
+        output_path += ".a78"
+    title = os.path.splitext(os.path.basename(source_path or output_path))[0]
+    rom = assemble.build_cart(bytes(conv.data), title=title)
+    with open(output_path, "wb") as f:
+        f.write(rom)
+    return output_path