ma hammerspoon

init.lua

local hyper = {"cmd", "shift",}

function handles_focus(win)
  local app = win:application()
  local app_name = app:title()
  if app_name ~= 'iTerm2' then
    return false
  end

  if string.match(win:title(), "(tmux)") then
    return true
  end
end

local focus_map = {
  ["D"] = 'focusWindowSouth',
  ["U"] = 'focusWindowNorth',
  ["L"] = 'focusWindowWest',
  ["R"] = 'focusWindowEast',
}


function at_edge(direction)
  local command = "export PATH=/usr/local/bin:$PATH; ~/.tmux/plugins/tmux-select-pane-no-wrap/scripts/at_edge.sh " .. direction
  local handle = io.popen(command)
  local result = handle:read("*a")
  handle:close()
  if tonumber(result) == 1 then
    return true
  end
end

-- The tmux bindings should use different keys than the hammerspoon
-- bindings. https://groups.google.com/forum/#!topic/hammerspoon/yp4AvJr5v7Q
-- Instead of having a delay, i just used an alternate hotkey set just for
-- hammerspoon -> tmux integration.
local tmux_focus_map = {
  ["U"] = '[',
  ["D"] = ']',
  ["L"] = '\\',
  ["R"] = 'X',
}
function focus_mover(direction)
  local win = hs.window.focusedWindow()
  if handles_focus(win) then
    if not at_edge(direction) then
      local tmux_hotkey = tmux_focus_map[direction]
      hs.eventtap.keyStroke({'ctrl'}, 'a')
      hs.eventtap.keyStroke({'ctrl'}, tmux_hotkey)
      return
    end
  end
  local meth = focus_map[direction]
  hs.window[meth](win)
end

hs.hotkey.bind(hyper, 'k', function()
  focus_mover('U')
end)

hs.hotkey.bind(hyper, 'j', function()
  focus_mover('D')
end)

hs.hotkey.bind(hyper, 'l', function()
  focus_mover('R')
end)

hs.hotkey.bind(hyper, 'h', function()
  focus_mover('L')
end)

-- Hyper i to show window hints
-----------------------------------------------

hs.hotkey.bind(hyper, "i", function()
    hs.hints.windowHints()
end)

-----------------------------------------------
-- Reload config on write
-----------------------------------------------

function reload_config(files)
    hs.reload()
end
hs.pathwatcher.new(os.getenv("HOME") .. "/.hammerspoon/", reload_config):start()
hs.alert.show("Config loaded")