init.lua

myModifierMode = hs.hotkey.modal.new()

function binderToMods(from,to,mods,toMods)
	local function f ()
		myModifierMode.triggered = true
		hs.eventtap.keyStroke(toMods, to, 1000) 
	end
	myModifierMode:bind(mods, from, f, nil, f )
end

function binder(from,to,mods)
	binderToMods(from, to, mods, mods)
end

allModifiers = {
	{},
	{'ctrl'}, 
	{'cmd'}, 
	{'shift'}, 
	{'alt'}, 
	{'ctrl', 'cmd'}, 
	{'ctrl', 'shift'}, 
	{'ctrl', 'alt'}, 
	{'cmd', 'shift'}, 
	{'cmd', 'alt'}, 
	{'shift', 'alt'}
}

function binderAll(from, to)
	for _, v in pairs(allModifiers) do
		binder(from, to, v)
	end
end

myModifiers = {}
for _, v in pairs(allModifiers) do
	table.insert(myModifiers, hs.hotkey.bind(v, "f19",
		function()
			myModifierMode:enter()
			myModifierMode.triggered = false
		end,
		function()
			myModifierMode:exit()
			if not myModifierMode.triggered then
				for _, m in pairs(myModifiers) do
					m:disable()
				end
				hs.eventtap.keyStroke({}, "f19")
				for _, m in pairs(myModifiers) do
					m:enable()
				end
			end
		end
		)
	)
end	

binderAll('d', 'left')
binderAll('h', 'down')
binderAll('t', 'up')
binderAll('n', 'right')

binderToMods('a', 'a', {}, {'ctrl', 'shift', 'cmd', 'alt'})
binderToMods('c', 'c', {}, {'ctrl', 'shift', 'cmd', 'alt'})
binderToMods('i', 'i', {}, {'ctrl', 'shift', 'cmd', 'alt'})
binderToMods('escape', 'escape', {}, {'ctrl', 'shift', 'cmd', 'alt'})

binder('space', 'padenter')