First public commit.

lenser/bbc/exporter.py

@@ -0,0 +1,24 @@
+"""Build a BBC Micro DFS disk (.ssd) from a conversion."""
+from __future__ import annotations
+
+from . import ssd
+from .viewer.assemble import LOAD_ADDR, build_viewer
+
+
+def export_ssd(conv, output_path, source_path=None, display="forever",
+               seconds=0, video="pal") -> str:
+    """Two DFS files: the !BOOT loader (sets mode + palette, *LOADs IMG) and the
+    IMG screen data.  Boot option 2 (*RUN !BOOT) so SHIFT+BREAK autostarts it."""
+    if not output_path.lower().endswith(".ssd"):
+        output_path += ".ssd"
+    m = conv.meta
+    viewer = build_viewer(m["bbc_mode"], m["ncol"], m["physicals"], m["base"],
+                          display=display, seconds=seconds, video=video)
+    # !BOOT autostarts on SHIFT+BREAK (real hardware); PIC is the same loader
+    # under a name with no '!' so it can be *RUN from a command line / emulator.
+    files = [
+        ("!BOOT", LOAD_ADDR, LOAD_ADDR, viewer),
+        ("PIC", LOAD_ADDR, LOAD_ADDR, viewer),
+        ("IMG", m["base"], m["base"], conv.data),
+    ]
+    return ssd.write_ssd(output_path, files, title="8BITLENSER", boot_option=2)