emacs-dwim

#!/bin/bash
# Author: Ian Yang

_is_emacs_daemon_started () {
    netstat -nlpx 2> /dev/null | awk '{print $NF}' | grep -qF "/tmp/emacs$UID/server"
}

_is_emacs_window_exist () {
    wmctrl -lx 2> /dev/null | awk '{print $3}' | grep -qF 'emacs.Emacs'
}

main () {
    if ! _is_emacs_daemon_started; then
        echo -n 'starting emacs daemon'
        if /usr/bin/emacs --daemon &> /tmp/emacs$UID.log; then
            echo ' [sucess]'
        else
            echo ' [faild]'
            return 1
        fi
    fi

    if [ -n "$DISPLAY" ]; then
        local desk=$(wmctrl -d 2> /dev/null |\
            sed -n 's/^\([0-9]*\)[[:space:]]*\*.*/\1/p')
        if _is_emacs_window_exist; then
            wmctrl -x -a emacs.Emacs &> /dev/null
            if [ -n "$1" ]; then
                /usr/bin/emacsclient "$@"
                [ -n "$desk" ] && wmctrl -s "$desk"
            fi
        else
            if [ -n "$1" ]; then
                /usr/bin/emacsclient -c "$@" &
            else
                /usr/bin/emacsclient -n -c &
            fi
            local -i tries=3
            while ! wmctrl -x -a emacs.Emacs &> /dev/null &&\
                    [ $tries -gt 0 ]; do
                sleep 1
                tries=tries-1
            done
            wait $!
            [ -n "$1" -a -n "$desk" ] && wmctrl -s "$desk"
        fi
    else
        /usr/bin/emacsclient "$@"
    fi
}

main "$@"