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hidutil remaps inside the IOKit HID driver, below the window server, so the
key stops being Caps Lock before anything above the driver sees it: no toggle
to suppress, and F20 is a real key to other apps, to System Settings
shortcuts, to a password field. An eventtap cannot do this -- Caps Lock is not
reachable from there, which is why hs.hid exists as its own IOKit module.
What hidutil will not do is cover a keyboard attached after it ran, so dotlib
re-applies on USB attach, on wake, and on a Caps Lock event. That last one is
the general answer: a mapped keyboard cannot produce a Caps Lock event, so an
event arriving at all is proof of a keyboard the remap missed, and the fault
triggers its own repair. The watchers are there to get the common cases before
a key is pressed, since the repairing press is spent repairing.
No launchd job and no link/ part. The remap lives and dies with Hammerspoon,
which already owns the keyboard on these machines, and a plist would only have
bought independence from it for the second or two before it starts -- a user
agent does not run at the login window either.
Nothing is bound to f20 here; bind it like any other key. A machine gives the
key back with capslock_off() from its local.lua, which loads last: shadowing
cannot undo a side effect that has already run. hs.ipc is required so
capslock_status() answers from a shell.
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A machine's local.lua is a separate chunk, so init.lua's locals were invisible
to it and anything it wanted -- hotkey(), the mod tables, type_text -- had to
be copied. They live in dotlib.lua now, linked beside init.lua, and both files
reach them the same way: require("dotlib").
init.lua keeps its own vocabulary by aliasing what it uses, so the 500 lines
below are untouched. It prepends its own directory to package.path first:
Hammerspoon already puts the config directory there (Contents/Resources/
setup.lua), but taking it from this file's path holds however the config was
found. A machine that pulls without re-linking has no dotlib.lua beside
init.lua, which would lose every hotkey silently -- that case notifies and
names the fix.
Checked with a stubbed hs: the module's hotkey, focus, execute, type_text and
type_current_date all behave, and local-example.lua binds its four keys
through it.
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