Add "reload-cycle" action for cycling the source in dynamically updated input list

[cibinmathew]

• I have read through the manual page (man fzf)
• I have the latest version of fzf
• I have searched through the existing issues

Info

• OS
  • Linux
  • Mac OS X
  • Windows
  • Etc.
• Shell
  • bash
  • zsh
  • fish

Problem / Steps to reproduce

Feature Request
Would it be possible to add a functionality to cycle through the list of sources using a single key binding. Existing functionality #1750

eg:
find . -type f | fzf --bind 'ctrl-d:reload-cycle(find . -type d; find . -type f; find .; source#n)'

Instead of separate key for each like below
find . -type f | fzf --bind 'ctrl-d:reload(find . -type d),ctrl-f:reload(find . -type f)'

list of sources could be delimited.

[junegunn]

I'm not going to add this to fzf because we can write a script that cycles through a list of commands by keeping its own state in an external file.

rm -f /tmp/script-state
my-script /tmp/script-state | fzf --bind 'ctrl-d:reload:my-script /tmp/script-state'

[cibinmathew]

Thanks @junegunn
Does it make sense to add these snippets to wiki examples.