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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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The shell has ~/.localprofile and ssh and git their config-local; Hammerspoon
had nothing, so a machine wanting one different hotkey had to edit the file
every machine shares. Only init.lua is linked, so the directory around it is
already the machine's own -- a sibling file there is in no repo.
Loaded last, so it can override anything above, and through pcall: a mistake
in a local file must not take the rest of the config down. Reload with
ctrl-shift-alt-h as usual.
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Shell, editor and terminal configuration, the tools that go with them, and
szecret, an age-based secret manager whose store lives elsewhere.
History restarts here. What came before was not written to be read by
anyone else, and carried machine names, addresses and an encrypted secret
store; it is kept privately instead. What is left is meant to be safe on
any machine, including one whose owner is not me: see CLAUDE.md for the
rule it is written to.
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