April 26, 2015

A minor update to my Hammerspoon config

My Hammerspoon config was working perfectly, except for one little niggle. Say you’ve closed all the windows in an app, but are still ‘in’ that app… you now have no focused window and if you attempt (out of habit, as I do) to switch away to another window Hammerspoon’s console appears with an annoying error. So I added a check for hs.window.focusedWindow before each call to the focused window and if there isn’t a currently-focused window a dialog appears saying “No active window”. Which is much nicer. (Thanks to “Ng” in #hammerspoon on Freenode for the pointer.) Here’s the new version:

-----------------------------------------------
-- Set up
-----------------------------------------------

local hyper = {"shift", "cmd", "alt", "ctrl"}
hs.window.animationDuration = 0

require("hs.application")
require("hs.window")

-----------------------------------------------
-- hyper d for left one half window
-----------------------------------------------

hs.hotkey.bind(hyper, 'd', function()
    if hs.window.focusedWindow() then
        local win = hs.window.focusedWindow()
        local f = win:frame()
        local screen = win:screen()
        local max = screen:frame()

        f.x = max.x
        f.y = max.y
        f.w = max.w / 2
        f.h = max.h
        win:setFrame(f)
    else
        hs.alert.show("No active window")
    end
end)

-----------------------------------------------
-- hyper g for right one half window
-----------------------------------------------

hs.hotkey.bind(hyper, 'g', function()
    if hs.window.focusedWindow() then
        local win = hs.window.focusedWindow()
        local f = win:frame()
        local screen = win:screen()
        local max = screen:frame()

        f.x = max.x + (max.w / 2)
        f.y = max.y
        f.w = max.w / 2
        f.h = max.h
        win:setFrame(f)
    else
        hs.alert.show("No active window")
    end
end)

-----------------------------------------------
-- hyper f for fullscreen
-----------------------------------------------

hs.hotkey.bind(hyper, 'f', function()
    if hs.window.focusedWindow() then
        local win = hs.window.focusedWindow()
        local f = win:frame()
        local screen = win:screen()
        local max = screen:frame()

        f.x = max.x
        f.y = max.y
        f.w = max.w
        f.h = max.h
        win:setFrame(f)
    else
        hs.alert.show("No active window")
    end
end)

-----------------------------------------------
-- hyper r for top left one quarter window
-----------------------------------------------

hs.hotkey.bind(hyper, 'r', function()
    if hs.window.focusedWindow() then
        local win = hs.window.focusedWindow()
        local f = win:frame()
        local screen = win:screen()
        local max = screen:frame()

        f.x = max.x
        f.y = max.y
        f.w = max.w / 2
        f.h = max.h / 2
        win:setFrame(f)
    else
        hs.alert.show("No active window")
    end
end)

-----------------------------------------------
-- hyper t for top right one quarter window
-----------------------------------------------

hs.hotkey.bind(hyper, 't', function()
    if hs.window.focusedWindow() then
        local win = hs.window.focusedWindow()
        local f = win:frame()
        local screen = win:screen()
        local max = screen:frame()

        f.x = max.x + (max.w / 2)
        f.y = max.y
        f.w = max.w / 2
        f.h = max.h / 2
        win:setFrame(f)
    else
        hs.alert.show("No active window")
    end
end)

-----------------------------------------------
-- hyper v for bottom left one quarter window
-----------------------------------------------

hs.hotkey.bind(hyper, 'v', function()
    if hs.window.focusedWindow() then
        local win = hs.window.focusedWindow()
        local f = win:frame()
        local screen = win:screen()
        local max = screen:frame()

        f.x = max.x + (max.w / 2)
        f.y = max.y + (max.h / 2)
        f.w = max.w / 2
        f.h = max.h / 2
        win:setFrame(f)
    else
        hs.alert.show("No active window")
    end
end)

-----------------------------------------------
-- hyper c for bottom right one quarter window
-----------------------------------------------

hs.hotkey.bind(hyper, 'c', function()
    if hs.window.focusedWindow() then
        local win = hs.window.focusedWindow()
        local f = win:frame()
        local screen = win:screen()
        local max = screen:frame()

        f.x = max.x
        f.y = max.y + (max.h / 2)
        f.w = max.w / 2
        f.h = max.h / 2
        win:setFrame(f)
    else
        hs.alert.show("No active window")
    end
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")

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

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

-----------------------------------------------
-- Hyper hjkl to switch window focus
-----------------------------------------------

hs.hotkey.bind(hyper, 'k', function()
    if hs.window.focusedWindow() then
        hs.window.focusedWindow():focusWindowNorth()
    else
        hs.alert.show("No active window")
    end
end)

hs.hotkey.bind(hyper, 'j', function()
    if hs.window.focusedWindow() then
        hs.window.focusedWindow():focusWindowSouth()
    else
        hs.alert.show("No active window")
    end
end)

hs.hotkey.bind(hyper, 'l', function()
    if hs.window.focusedWindow() then
    hs.window.focusedWindow():focusWindowEast()
    else
        hs.alert.show("No active window")
    end
end)

hs.hotkey.bind(hyper, 'h', function()
    if hs.window.focusedWindow() then
        hs.window.focusedWindow():focusWindowWest()
    else
        hs.alert.show("No active window")
    end
end)

Note that I’ve also added hs.window.animationDuration = 0 (at the top of the config, under Set up). This has the effect of making window transitions much snappier; I don’t like the default animation behaviour.