Instant Profile (windows) Switching for Dia Browser using Hammerspoon

init.lua

--[[
  Dia Profile Switcher for macOS using Hammerspoon
  ------------------------------------------------
  This script allows instant switching between Dia browser profiles (e.g. Work and Personal)
  by detecting pinned tab titles in each window using macOS Accessibility APIs.

  It caches matched windows for fast reuse, and falls back to scanning tabs if the window is closed or lost.
]]

local cachedDiaWindows = {}

local function focusDiaByPinnedTab(tabName)
  -- Try cached
  local cached = cachedDiaWindows[tabName]
  if cached and cached:isVisible() and cached:title() ~= "" then
    cached:focus()
    return
  end

  -- Fallback to AX-based scan for pinned tab with matching title
  for _, win in ipairs(hs.window.filter.new("Dia"):getWindows()) do
    local axWin = hs.axuielement.windowElement(win)
    if not axWin then goto continue end

    local children = axWin.AXChildren or {}
    for _, child in ipairs(children) do
      if child:attributeValue("AXRole") == "AXGroup" then
        local subChildren = child:attributeValue("AXChildren") or {}
        for _, tab in ipairs(subChildren) do
          local title = tab:attributeValue("AXTitle")
          if title == tabName then
            cachedDiaWindows[tabName] = win
            win:focus()
            return
          end
        end
      end
    end
    ::continue::
  end

  hs.alert("No Dia window with pinned tab: " .. tabName)
end

-- Hotkeys: Switch between Dia profiles by detecting pinned tab titles
hs.hotkey.bind({ "ctrl", "alt", "cmd" }, "W", function()
  focusDiaByPinnedTab("CUSTOM TAB NAME")
end)

hs.hotkey.bind({ "ctrl", "alt", "cmd" }, "P", function()
  focusDiaByPinnedTab("CUSTOM TAB NAME")
end)