Hammerspoon: focusedWindows issue

[kour1er]

If I call:

local windows = hs.window.focusedWindows()

I get this error:

attempt to index a nil value (global 'uielement')

I am seeing this issue with 0.9.79 and 0.9.80 - prior to that it works fine.

I don't know if there's any connection to this GitHub issue:

837

But I have checked my accessibility settings and Hammerspoon does have permission. Let me know if I can provide further information.

[asmagill]

The actual function should be hs.window.focusedWindow() (no s at the end).

That said, the uielement error has been noted and will hopefully be fixed soon... https://github.com/Hammerspoon/hammerspoon/pull/2488#issuecomment-696510174

[kour1er]

Oh I'm sorry for the typo! So I guess the issue I'm seeing is the the fnutils.filter bit?

local windows = hs.window.focusedWindow()
test = hs.fnutils.filter(windows, hs.window.isStandard)

[asmagill]

hs.window.focusedWindow() returns a single hs.window object -- the one with the current focus (usually the frontmost window that is able to take input from the mouse and/or keyboard).

hs.fnutils.filter is expecting its first argument to be a table, not an element, so you could in theory do hs.fnutils.filter({ windows },... but that would still limit its checking to the one window returned by focusedWindow().

If you're wanting a table of all windows currently on the screen, you should use hs.window.allWindows(), or if all the windows for a specific application, something like app:allWindows() (where app is an hs.application object; app = hs.application("Hammerspoon") or app = hs.application.frontmostApplication(), for example) instead.

[cmsj]

Thanks for looking at this @asmagill. I think we can close this now the PR is merged.

[kour1er]

@asmagill thanks for the pointers! So this should work right?

    local appWithFocus = hs.application.frontmostApplication()
    local appWithFocusWindows = appWithFocus:allWindows()
    test = hs.fnutils.filter(appWithFocusWindows, hs.window.isStandard)

in 0.9.80 it throws the:
attempt to index a nil value (global 'uielement')
and in 0.9.78 it works. So I assume that the fix from 2488 will resolve this one?

Thanks again - sorry to add to the closed issue - just wanted to make sure I'm not doing something dumb (again).

[asmagill]

Close... first, yes, the uielement issue should be fixed in master. What you should see is an error thrown by hs.fnutils that it expects a function as the second argument, rather than what hs.window.isStandard should be resolving to -- nil, because of: second, isStandard is a method, not defined at the hs.window module level but for hs.window object instances... the following should work:

~lua
local appWithFocus = hs.application.frontmostApplication()
local appWithFocusWindows = appWithFocus:allWindows()
test = hs.fnutils.filter(appWithFocusWindows, function(w) return w:isStandard() end)
~

[kour1er]

So close :) thank you so much for putting up with me :)

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