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init.lua

-- put into ~/.hammerspoon
-- map Caps Lock key to Control in macOS settings (Keyboard -> Modifier Keys...)
-- Give all the accessability permissions in Hammerspoon preferences
-- NOTE: Changing "Key repeat rate" and "Delay until repeat" in macOS settings
-- require Hammerspoon restart to pick up those changes.
-- See: https://github.com/Hammerspoon/hammerspoon/issues/3264

local function pressFn(mods, key)
	if key == nil then
		key = mods
		mods = {}
	end

	return function() hs.eventtap.keyStroke(mods, key, 1000) end
end

local function remap(mods, key, pressFn)
	hs.hotkey.bind(mods, key, pressFn, nil, pressFn)	
end

remap({'ctrl'}, 'd', pressFn('pagedown'))
remap({'ctrl'}, 'u', pressFn('pageup'))

remap({'ctrl', 'shift'}, 'd', pressFn({'shift'}, 'pagedown'))
remap({'ctrl', 'shift'}, 'u', pressFn({'shift'}, 'pageup'))

remap({'ctrl'}, 'h', pressFn('left'))
remap({'ctrl'}, 'j', pressFn('down'))
remap({'ctrl'}, 'k', pressFn('up'))
remap({'ctrl'}, 'l', pressFn('right'))

remap({'ctrl', 'cmd'}, 'h', pressFn({'cmd'}, 'left'))
remap({'ctrl', 'cmd'}, 'j', pressFn({'cmd'}, 'down'))
remap({'ctrl', 'cmd'}, 'k', pressFn({'cmd'}, 'up'))
remap({'ctrl', 'cmd'}, 'l', pressFn({'cmd'}, 'right'))

remap({'ctrl', 'alt'}, 'h', pressFn({'alt'}, 'left'))
remap({'ctrl', 'alt'}, 'j', pressFn({'alt'}, 'down'))
remap({'ctrl', 'alt'}, 'k', pressFn({'alt'}, 'up'))
remap({'ctrl', 'alt'}, 'l', pressFn({'alt'}, 'right'))

remap({'ctrl', 'shift'}, 'h', pressFn({'shift'}, 'left'))
remap({'ctrl', 'shift'}, 'j', pressFn({'shift'}, 'down'))
remap({'ctrl', 'shift'}, 'k', pressFn({'shift'}, 'up'))
remap({'ctrl', 'shift'}, 'l', pressFn({'shift'}, 'right'))

remap({'ctrl', 'shift', 'cmd'}, 'h', pressFn({'shift', 'cmd'}, 'left'))
remap({'ctrl', 'shift', 'cmd'}, 'j', pressFn({'shift', 'cmd'}, 'down'))
remap({'ctrl', 'shift', 'cmd'}, 'k', pressFn({'shift', 'cmd'}, 'up'))
remap({'ctrl', 'shift', 'cmd'}, 'l', pressFn({'shift', 'cmd'}, 'right'))

remap({'ctrl', 'shift', 'alt'}, 'h', pressFn({'shift', 'alt'}, 'left'))
remap({'ctrl', 'shift', 'alt'}, 'j', pressFn({'shift', 'alt'}, 'down'))
remap({'ctrl', 'shift', 'alt'}, 'k', pressFn({'shift', 'alt'}, 'up'))
remap({'ctrl', 'shift', 'alt'}, 'l', pressFn({'shift', 'alt'}, 'right'))