Zsh completion for words from all tmux panes using FZF

tmux-panes-completion.zsh

_complete_tmux_pane_words() {
  local -a w

  if [[ -z "$TMUX_PANE" ]]; then
    _message "not running inside tmux!"
    return 1
  fi

  _tmux_capture_pane() {
    tmux capture-pane -J -p $@ |
      sed -e 'p;s/[^a-zA-Z0-9_]/ /g' |
      tr -s '[:space:]' '\n' |
      grep -o "\w.*\w"
  }

  local i
  for i in $(tmux list-panes -a -F '#D') ; do
    w+=$(_tmux_capture_pane -t "$i")
  done

  w=$(echo -n "$w" | sort | uniq)

  local selected=$(echo ${w} | fzf --height='25%' --reverse --prompt="tmux> ")

  LBUFFER="${LBUFFER}${selected}"

  zle reset-prompt

  return 0
}

zle -N complete-fzf-pane-words _complete_tmux_pane_words
bindkey ^x^x complete-fzf-pane-words