hammerspoon config

init.lua

-- Tap caps lock for esc, use caps lock with another key for ctrl.
send_escape = false
last_mods = {}

control_key_handler = function()
  send_escape = false
end

control_key_timer = hs.timer.delayed.new(0.15, control_key_handler)

control_handler = function(evt)
  local new_mods = evt:getFlags()
  if last_mods["ctrl"] == new_mods["ctrl"] then
    return false
  end
  if not last_mods["ctrl"] then
    last_mods = new_mods
    send_escape = true
    control_key_timer:start()
  else
    if send_escape then
      hs.eventtap.keyStroke({}, "ESCAPE")
    end
    last_mods = new_mods
    control_key_timer:stop()
  end
  return false
end

control_tap = hs.eventtap.new({hs.eventtap.event.types.flagsChanged}, control_handler)
control_tap:start()

other_handler = function(evt)
  send_escape = false
  return false
end

other_tap = hs.eventtap.new({hs.eventtap.event.types.keyDown}, other_handler)
other_tap:start()

-- Open/Toggle applications -----------------------

function toggle_app(name)
  local client = hs.application.get(name)
  if client == nil then
    client = hs.application.open(name)
    client:hide()
  end
  if not client:isFrontmost() then
    client:activate()
  elseif client:isFrontmost() then
    client:hide()
  end
end

-- Toggle email window
function toggle_email()
  toggle_app("Nylas Mail")
end
hs.hotkey.bind({"cmd", "shift"}, "m", toggle_email)

-- Toggle Slack window
function toggle_slack()
  toggle_app("Slack")
end
hs.hotkey.bind({"cmd", "shift"}, "s", toggle_slack)

-- Toggle Github window
function toggle_github()
  toggle_app("GitHub Desktop")
end
hs.hotkey.bind({"cmd", "shift"}, "g", toggle_github)

-- Reload config
hs.hotkey.bind({"cmd", "alt", "ctrl"}, "R", function()
  hs.reload()
end)
hs.alert.show("Config loaded")