Move windows around using Vim-style hotkeys

init.lua

-- ~/.hydra/init.lua

-- This file requires boosh.lua, which can be found in my dotfiles:
-- https://github.com/iansinnott/dotfiles/tree/master/dotfiles/hydra
require "boosh"

-- The 'meta' key for window actions will be cmd+shift.
local meta = {"cmd", "shift"}

--- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
-- Dropdown GUI Menu
--- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
menu.show(function()
    return {

      -- Reload this file
      {title = "Reload Config", fn = hydra.reload},

      -- Menu horizontal rule
      {title = "-"},

      -- open a repl
      --   the repl is a Lua prompt; type "print('hello world')"
      {title = "Open REPL...", fn = repl.open},

      -- Miscellaneous Hydra commands
      {title = "-"},
      {title = "About", fn = hydra.showabout},
      {title = "Quit Hydra", fn = os.exit},
    }
end)

--- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
-- Window Manipulation Functions
--- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----

-- Full Screen
hotkey.bind(meta, "M", ext.grid.maximize_window)

-- Push or resize the window in a direction
hotkey.bind(meta, 'H', function() ext.grid.send_or_resize('left') end)
hotkey.bind(meta, 'J', function() ext.grid.send_or_resize('down') end)
hotkey.bind(meta, 'K', function() ext.grid.send_or_resize('up') end)
hotkey.bind(meta, 'L', function() ext.grid.send_or_resize('right') end)