Hammerspoon virtual numpad for macOS

init.lua

k = hs.hotkey.modal.new('ctrl-shift', 'n')
function k:entered() hs.alert'Virtual Numpad' end
function k:exited() hs.alert'Exit Virtual Numpad' end
k:bind('ctrl-shift', 'n', function() k:exit() end)

hs.fnutils.each({
  { key='j', padkey='pad1'},
  { key='k', padkey='pad2'},
  { key='l', padkey='pad3'},
  { key='u', padkey='pad4'},
  { key='i', padkey='pad5'},
  { key='o', padkey='pad6'},
  { key='7', padkey='pad7'},
  { key='8', padkey='pad8'},
  { key='9', padkey='pad9'},
  { key='m', padkey='pad0'},
  { key='/', padkey='pad+'},
  { key=';', padkey='pad-'},
  { key='p', padkey='pad*'},
  { key='0', padkey='pad/'},
}, function(vmap)
  k:bind({}, vmap.key,
    function() hs.eventtap.keyStroke({}, vmap.padkey, 20) end,
    nil,
    function() hs.eventtap.keyStroke({}, vmap.padkey, 20) end)
  end
)

Alright I think I got it figured out. Try this config. It will make ctrl-shift-n toggle virtual numpad. (Feel free to change that.)
Just install Hammerspoon, choose "File >Open Config", paste this in, save, then go back to Hammerspooon and choose "Reload Config”. On macOS Catalina, be sure to go into System Preferences > Security & Privacy > Privacy > Accessibility > Check "Hammerspoon.app"

Good job. Thanks for sharing.

Any idea why it might not be working in virtual machine apps?..

@andkirby not sure in that case. I suspect the keyboard shortcut conflicts with another one in the virtual machine but that's just a guess right now since I don't have access to a macOS VM at the moment.

I have experience with mouse movements and clicks. So built-in mechanics are not working in this VM. The mouse moves, but the VM does not respond to that action, e.g. some hover action should be triggered and clicks did not work.

And I ended up with using shell CLI cliclick app and use it directly. Probably, HS has some common issue with emulating that does not in VMs.

Code

-- Function to simulate mouse click at specific coordinates using cliclick
local function clickAt(x, y)
    hs.execute(string.format("/opt/homebrew/bin/cliclick c:%d,%d", tonumber(x), tonumber(y)))
end

-- Function to simulate mouse movement using cliclick
local function moveMouse(x, y)
    hs.execute(string.format("/opt/homebrew/bin/cliclick m:%d,%d", tonumber(x), tonumber(y)))
    hs.execute('sleep 0.25')
end