~/.hammerspoon/init.lua

init.lua

local benqDisplay = "BenQ LCD"
local defaultDisplay = "Color LCD"
local padding = 20

-- disable animation
hs.window.animationDuration = 0

-- Quick if/else helper function
function fif(condition, if_true, if_false)
  if condition then return if_true else return if_false end
end

function applyLayouts()
    -- Initialize some common window size vars
    local screen = hs.screen.allScreens()[1]
    local frame = screen:frame()
    local width = frame.w - padding * 2
    local height = frame.h - padding * 2
    local halfWidth = frame.w / 2 - padding * 1.5
    local halfHeight = frame.h / 2 - padding * 1.5
    local largeHeight = height * 0.8 - padding / 2
    local smallHeight = height * 0.2 - padding / 2
    local midWidth = halfWidth + padding * 2
    local midHeight = halfHeight + padding

    -- Setup geometry vars for commonly used screen spaces
    local fullScreen = hs.geometry.rect(0, 0, frame.w, frame.h)
    local leftHalf = hs.geometry.rect(padding, padding, halfWidth, height)
    local rightHalf = hs.geometry.rect(padding * 2 + halfWidth, padding, halfWidth, height)
    local right75 = hs.geometry.rect(padding * 2 + halfWidth / 1.5, padding, halfWidth * 1.3333, height)
    local left25 = hs.geometry.rect(padding, padding, halfWidth * 0.6666, height)
    local topRight = hs.geometry.rect(padding * 2 + halfWidth, padding, halfWidth, halfHeight)
    local largeTopRight = hs.geometry.rect(padding * 2 + halfWidth, padding, halfWidth, largeHeight)
    local smallBottomRight = hs.geometry.rect(midWidth, largeHeight + padding * 2, halfWidth, smallHeight)
    local bottomRight = hs.geometry.rect(midWidth, halfHeight + padding * 2, halfWidth, halfHeight)

    -- Find the 'main' window (if any) of all the applications we care about
    local chrome = hs.application.find("Google Chrome") and hs.application.find("Google Chrome"):mainWindow()
    local atom = hs.application.find("Atom") and hs.application.find("Atom"):mainWindow()
    local emacs = hs.application.find("Emacs") and hs.application.find("Emacs"):mainWindow()
    local term = hs.application.find("iTerm2") and hs.application.find("iTerm2"):focusedWindow()
    local hyperterm = hs.application.find("HyperTerm") and hs.application.find("HyperTerm"):focusedWindow()
    local slack = hs.application.find("Slack") and hs.application.find("Slack"):mainWindow()
    local itunes = hs.application.find("iTunes") and hs.application.find("iTunes"):mainWindow()
    local spotify = hs.application.find("Spotify") and hs.application.find("Spotify"):mainWindow()
    local messages = hs.application.find("Messages") and hs.application.find("Messages"):mainWindow()

    local largeLayout = screen:name() == benqDisplay

    -- Establish desired layouts for each application depending on which screen is being used
    local expectedFrames = {
        ["chrome"] = {chrome, fif(largeLayout, leftHalf, fullScreen)},
        ["atom"] = {atom, fif(largeLayout, largeTopRight, fullScreen)},
        ["emacs"] = {emacs, fif(largeLayout, rightHalf, right75)},
        ["term"] = {term, fif(largeLayout, rightHalf, fullScreen)},
        ["hyperterm"] = {hyperterm, fif(largeLayout, smallBottomRight, fullScreen)},
        ["slack"] = {slack, leftHalf},
        ["itunes"] = {itunes, topRight},
        ["spotify"] = {spotify, topRight},
        ["messages"] = {messages, bottomRight}
    }

    -- Iterate through each window and apply the expected layout if the current bounds don't already match
    for key,value in pairs(expectedFrames) do
        local app = value[1]
        local expectedFrame = value[2]
        if app and (app:frame() ~= expectedFrame) then
            app:setFrame(expectedFrame)
        end
    end
end

-- Shortcut to manually reset layout
hs.hotkey.bind({"cmd", "alt"}, ";", function()
  applyLayouts()
end)

-- VIM-esque keybindings to focus windows using canrdinal directions.
hs.hotkey.bind({"cmd", "alt"}, "K", function()
  hs.window.focusedWindow():focusWindowNorth(nil, true, true)
end)
hs.hotkey.bind({"cmd", "alt"}, "L", function()
  hs.window.focusedWindow():focusWindowEast(nil, true, true)
end)
hs.hotkey.bind({"cmd", "alt"}, "J", function()
  hs.window.focusedWindow():focusWindowSouth(nil, true, true)
end)
hs.hotkey.bind({"cmd", "alt"}, "H", function()
  hs.window.focusedWindow():focusWindowWest(nil, true, true)
end)

hs.hotkey.bind({"cmd", "alt"}, "P", function()
    hs.spotify.playpause()
end)

-- Watch for space/screen changes to re-apply layouts
hs.spaces.watcher.new(applyLayouts):start()
hs.screen.watcher.new(applyLayouts):start()

-- Confirm load
hs.alert.show("Config loaded")