Full Hammerspoon File

init.lua

require("hs.ipc")

function shell(command)
   hs.execute(command .. ' &', true)
end

--- ==========================================
--- Terminal <> Browser ctrl+t
--- ==========================================
-- I spend all my time in chrome and terminal, ctrl+t swaps between the two
hs.hotkey.bind({'ctrl'}, "t", function()
    app_name = hs.application.frontmostApplication():name()
    if app_name == 'Alacritty' then
       hs.osascript.applescript('tell application "Google Chrome" to activate')
    else
       hs.osascript.applescript('tell application "Alacritty" to activate')
    end
end)

--- ==========================================
--- Reload Hammerspoon
--- ==========================================
function reloadConfig(files)
   hs.alert('Reloading Hammerspoon, please wait...')
   shouldReload = false
   for _,file in pairs(files) do
      if file:sub(-4) == ".lua" then
         shouldReload = true
      end
   end

   if shouldReload then
      hs.timer.delayed.new(0.1, doReload):start()
   end
end

function doReload(evt)
   if doReload then
      result, success = hs.execute("luac -p ~/.hammerspoon/init.lua 2>&1 >/dev/null", true)
      if not success then
         hs.alert(result)
         return
      end

      result, success = hs.execute("luac -p ~/.hammerspoon/Spoons/KeyFu.spoon/init.lua 2>&1 >/dev/null", true)

      if not success then
         hs.alert(result)
         return
      end

      hs.reload()
   end
end

hs_config_watcher = hs.pathwatcher.new(os.getenv("HOME") .. "/.hammerspoon/", reloadConfig):start()

-- ==========================================
-- ESC
-- ==========================================
g_mod_keys = true
send_escape = false
last_mods = {}

control_key_handler = function()
   send_escape = false
end

control_key_timer = hs.timer.delayed.new(0.10, control_key_handler)

control_handler = function(evt)
   if not g_mod_keys then
      return
   end

   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
         if not g_hs_mode then
            hs.eventtap.event.newKeyEvent({}, 'escape', true):post()
            hs.eventtap.event.newKeyEvent({}, 'escape', false):post()
         end
      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()

-- ==========================================
-- Hammerspoon Mode
-- ==========================================
-- OS level Hammerspoon Leader Key is ctrl+m
g_hs_mode = false
g_hs_mode_command = ''

hs.hotkey.bind({'ctrl'}, "m", function()
      if not g_hs_mode then
         hs.alert('hs mode: on')
         g_hs_mode = true
      end
end)

-- when in Hammerspoon mode, process keyboard input and execute a command
hs_mode_handler = function(evt)
   local new_mods = evt:getFlags()

   if not g_hs_mode then
      return
   end

   if evt:getCharacters(true) then
      g_hs_mode_command = g_hs_mode_command .. evt:getCharacters(true)
   end

   local was_processed = false

   if evt:getCharacters(true) == 'i' then -- i takes you back to insert mode
      was_processed = true
      hs.alert('hs mode: off')
   elseif g_hs_mode_command == 'go' then -- go takes you to google
      shell('open http://google.com')
      was_processed = true
   elseif g_hs_mode_command == 'gm' then -- gm takes you to gmail
      shell('open http://gmail.com')
      was_processed = true
   end

   if was_processed then
      g_hs_mode = false
      g_hs_mode_command = ''
      return true
   end

   if string.len(g_hs_mode_command) > 2 then
      hs.alert("exiting (unknown command): " .. g_hs_mode_command)
      g_hs_mode = false
      g_hs_mode_command = ''
   end

   return true
end

hs_mode = hs.eventtap.new({hs.eventtap.event.types.keyDown}, hs_mode_handler)
hs_mode:start()

hs.alert.show("Config loaded.")