Run Emacs.app as Client/Server, for someone who likes GUI emacs and emacsclient to speed up start-up time.

emacs.sh

#!/bin/bash
BG_RED=`tput setaf 1`
BG_GREEN=`tput setaf 2`
BOLD=`tput bold`
RESET=`tput sgr0`

EMACS='/Applications/Emacs.app'
EMACS_CLIENT='/Applications/Emacs.app/Contents/MacOS/bin/emacsclient'

DEFAULT_EVAL='(switch-to-buffer "*scratch*")'
DEFAULT_ARGS="-e"
NO_WAIT='-n'

function run_client(){
    if [ $# -ne 0 ]
    then
        ${EMACS_CLIENT} ${NO_WAIT} $@
    else
        ${EMACS_CLIENT} ${NO_WAIT} ${DEFAULT_ARGS} "${DEFAULT_EVAL}" &> /dev/null
    fi
}

echo -e "Checking Emacs server status...\c"
if pgrep Emacs &> /dev/null
then
    echo "${BOLD}${BG_GREEN}Active${RESET}"
    echo -e "Connecting...\c"
    run_client $*
    echo "${BOLD}${BG_GREEN}DONE${RESET}"
else
    echo "${BOLD}${BG_RED}Inactive${RESET}"
    echo -e "Emacs server is starting...\c"
    open -a ${EMACS}
    echo "${BOLD}${BG_GREEN}DONE${RESET}"

    echo -e "Trying connecting...\c"
    until run_client $* &> /dev/null;[ $? -eq 0 ]
    do
        sleep 1
    done
    echo "${BOLD}${BG_GREEN}DONE${RESET}"
fi

Thank you, ChillingHsu. This works with the MacPort build by YAMAMOTO Mitsuharu by changing the path of emacsclient to where it is. But there are some issues.

1. Closing the windows of emacs closes the server by C-x C-c. Is it possible to leave the daemon running in the background?
2. Is it possible to let GUI emacs connect to existing emacs daemon?