Operator decision: "make this version devour their custom settings and re-output
the correct binding file with the updates -- I'd like to eliminate competing
code paths." Before this, the preserved-bindings.txt convention meant upgraders
stayed frozen on whatever layout their file was written under, forever: two
player populations, two sets of true documentation, and every future default
improvement reaching only fresh installs.
THE MIGRATION (PadBindingProfile::MigrateBindingsFile, run once at load):
* A file carrying the new "# bindings-board 2" marker is left alone -- the
check is the first thing that runs, so this is a no-op forever after.
* Otherwise: every row matching the UNION OF EVERY DEFAULT SET EVER SHIPPED
(85 canonical rows, harvested from c2ee729..1cda880 and embedded as a
table; comments stripped, whitespace collapsed, uppercased) is dropped --
those rows were never a player's choice, they were just the old board.
* Rows the player actually authored are CARRIED with their original text and
comments, and WIN over the new defaults: the losing default row is emitted
commented out as "# (yours wins) ...", keyed by the control ("KEY T",
"PAD A", "PADAXIS LX") so key rows only displace key rows.
* The joystick wizard's marker-delimited section is preserved VERBATIM (the
same markers L4JOY rewrites between), so HOTAS players migrate without
re-running the wizard.
* The previous file is saved as bindings.old.txt first. Restoring it over
bindings.txt just re-migrates next boot -- deliberate: the old WORLD is not
restorable, only the player's own rows persist. That is the point.
VERIFIED end-to-end with the real exe (three planted scenarios):
A. old-world file (8 old-default rows + 2 authored rows incl. a rate tweak +
a wizard section): both authored rows carried with comments, both
conflicting new defaults stood down with "(yours wins)", wizard section
byte-preserved, backup written, log line states all counts, and the
migrated file parses with ZERO malformed lines.
B. already-migrated file: byte-identical md5 after a full boot, no migration
line, no backup touched. (First attempt at this check clobbered its own
evidence by running case C first -- re-run properly.)
C. no file: fresh defaults now carry the marker as line 1, no migration.
The operator's real bindings.txt was stashed before testing and restored
untouched; it will migrate on their own next launch, as intended.
Docs flipped to the new reality: the README's "your keys DO NOT change"
upgrade promise is replaced by the migration story (customs + stick kept, old
stock keys replaced, bindings.old.txt escape hatch); CONTROLS.md gains the same
note; context/glass-cockpit.md records the mechanism, the 85-row table's
provenance, and why restoring the backup re-migrates.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
