local usbWatcher = hs.usb.watcher.new(function(device)
    if device.productName == "EMEET SmartCam C960" then
      if device.eventType == "added" then
        hs.execute("networksetup -setairportpower en0 off")
        hs.notify.new({title="Wi-Fi", informativeText="Disabled (USB device connected)"}):send()
      elseif device.eventType == "removed" then
        hs.execute("networksetup -setairportpower en0 on")
        hs.notify.new({title="Wi-Fi", informativeText="Re-enabled (USB device removed)"}):send()
      end
    end
  end)
  usbWatcher:start()

  - Dumping all open Safari tabs to an Obsidian doc
  - Adding 'hyper' (Ctrl-Opt-Cmd) keybinds to pop a new window for:
    - Safari
    - Finder
    - Terminal (Ghostty)
    - VS Code
    - Notes
    - Editing Hammerspoon/AeroSpace/Sketchybar config
    - Reloading Hammerspoon config
    - Reloading Sketchybar
    - Quitting all Dock apps except Finder
    - Screen lock
    - System sleep
    - Opening front Finder folder in VS Code
    - Opening front Safari URL on Archive.today
    - Showing front Safari window tab count
    - Showing front app bundle ID
    - Posting notification about current Music track
    - Controlling my Logi Litra light (various color temps/brightnesses)
    - Starting/stopping a client work timer
  - Tying it to AeroSpace for:
    - Pushing a window to another monitor
    - Performing a two-up window layout
    - Swapping those two windows
    - Closing all other workspace windows
    - Gathering all windows to first workspace
  - Ensuring some background apps stay running if they crash
  - Prompting to unmount disk images if trashed
  - Binding into Skim to jump to specific sections of spec PDFs using terse Markdown URLs

    -- Hide Zoom's "share" windows so it doesn't come back on ESC keypress
    local zoomWindow = nil
    local originalFrame = nil
    
    hs.hotkey.bind({"cmd", "ctrl", "alt"}, "H", function()
      print("> trying to hide zoom")
      if not zoomWindow then
        print(">  looking for window")
        zoomWindow = hs.window.find("zoom share statusbar window")
      end
    
      if zoomWindow then
        print(">  found window")
        if originalFrame then
          print(">    restoring")
          zoomWindow:setFrame(originalFrame)
          originalFrame = nil
          zoomWindow = nil
        else
          print(">    hiding")
          originalFrame = zoomWindow:frame()
          local screen = zoomWindow:screen()
          local frame = zoomWindow:frame()
          frame.x = screen:frame().w + 99000
          frame.y = screen:frame().h + 99000
          zoomWindow:setFrame(frame)
        end
      else
        print(">  window not found")
      end
    end)

    local appHotkeys = {}

    local function remapAppHotkey(appName, fromMods, fromKey, toMods, toKey, delay)
        if not appHotkeys[appName] then
            appHotkeys[appName] = {}
        end
        local hotkey = hs.hotkey.new(fromMods, fromKey, function()
            hs.eventtap.keyStroke(toMods, toKey, delay or 0)
        end)
        table.insert(appHotkeys[appName], hotkey)
    end
    
    local appWatcher = hs.application.watcher.new(function(appName, eventType)
        local hotkeys = appHotkeys[appName]
        if not hotkeys then return end
        for _, hotkey in ipairs(hotkeys) do
            if eventType == hs.application.watcher.activated then
                hotkey:enable()
            elseif eventType == hs.application.watcher.deactivated then
                hotkey:disable()
            end
        end
    end)
    
    appWatcher:start()

    -- Remap app hotkeys
    remapAppHotkey("Finder", { "cmd" }, "q", { "cmd" }, "w", 0.5)
    ... etc ...

otherwise I'm slowly working on a Spoon that figures out if there is an active meeting in Zoom, Teams, Huddle, Google Meet and will allow for muting, video enable/disable and screen sharing etc

It's lua, so you can get creative with https://fennel-lang.org/

Can't live without AutoHotkey on Windows.

Thanks to everyone who contributed to both!

It's fun to combine with qmk [0], which gives you a bunch more options for hotkeys on your keyboard via layers. I've ended up with a layer where half the keyboard is Hammerspoon shortcuts directly to apps (e.g. go to Slack, to Chrome, etc.) and half of it is in-app shortcuts (like putting cmd-number on the home row, for directly addressing chrome tabs).

Between this and one of the tiling window manager-adjacent tools (I use Sizeup), I can do all my OS-level navigation directly. "Oh I want to go to Slack and go to this DM" is a few keystrokes away, and not dependent on what else I was doing.

[0] https://qmk.fm/