Popup terminal with tmux

.tmux.conf

# ... your other config

bind-key -n M-3 run-shell 'toggle-tmux-popup'
# you can switch `M-3` to any keybindings you like.

toggle-tmux-popup

#!/bin/bash
# 👻 put this file into your $PATH, normally `~/.local/bin/toggle-tmux-popup`
# 👻 this script should have runable permission.

if [ "$(tmux display-message -p -F "#{session_name}")" = "popup" ];then
    tmux detach-client
else
    tmux popup -d '#{pane_current_path}' -xC -yC -w80% -h75% -E "tmux attach -t popup || tmux new -s popup"
fi

There's no need to use run-shell, the if-check can be done using the if-shell command with the -F option. The above snippet simplified:

# Toggle popup window with Alt-3
bind-key -n -N 'Toggle popup window' M-3 if-shell -F '#{==:#{session_name},popup}' {
    detach-client
} {
    display-popup -d "#{pane_current_path}" -xC -yC -w 80% -h 75% -E 'tmux attach-session -t popup || tmux new-session -s popup'
}

This is also significantly more readable. Though, I think it requires a more recent tmux version.

@LintaoAmons the -A option can auto create new session if it's not exist.

#! /usr/bin/env bash

tmux_popup_session_name="_popup"

if [ "$(tmux display-message -p -F "#{session_name}")" = "${tmux_popup_session_name}" ];then
    tmux detach-client
else
    tmux popup -d '#{pane_current_path}' -xC -yC -w80% -h80% -E\
      "tmux new-session -A -s ${tmux_popup_session_name}"
fi