A CopyQ command to implement a Clipboard FIFO

FIFO.ini

[Command]
Command="
    copyq:
    //Works as of CopyQ v10.0.0
    var c = count()
    if (c==0) {
       popup('Nothing to FIFO-paste')
       abort()
    }

    maxrow = c-1
    select(maxrow)
    try {
        paste()
    } catch (e) {
        // Pasting failed!
        popup('Pasting Failed', e)
        fail()
    }
    popup('FIFO pasted', str(c-1)+\" remaining\", 2000)
    if (config('move') == 'true') {
      remove(0)
    } else {
      remove(maxrow)
    }
    "
GlobalShortcut=meta+ctrl+alt+v
IsGlobalShortcut=true
Name=HM Clipboard FIFO

It is not working it deletes wrong item in clipboard.

That's because of the value of the move setting (Preferences -> History -> Move item to the top). When true, the script needs a tweak. The reason is that the select function not only selects but can also move depending on that setting. You can have it like the following to work with both values:

[Command]
Command="
copyq: 
maxrow = count() - 1
select(maxrow)
paste()
if (config('move') == 'true') {
  remove(0)
} else {
  remove(maxrow)
}"
GlobalShortcut=ctrl+shift+v
Name=HM Clipboard FIFO

I just updated it to a version that works with CopyQ v10.0.0.
Thank you @waiting-for-dev !