prompt and window titles for zsh (any maybe bash)

prompt.sh

#########################################
##  Set prompt, iTerm2 window and tabs ##
#########################################

# Color constants used in the prompt
BLACK="%{%}"
BOLD_BLACK="%{%}"
RED="%{%}"
BOLD_RED="%{%}"
GREEN="%{%}"
BOLD_GREEN="%{%}"
YELLOW="%{%}"
BOLD_YELLOW="%{%}"
BLUE="%{%}"
BOLD_BLUE="%{%}"
MAUVE="%{%}"
BOLD_MAUVE="%{%}"
CYAN="%{%}"
BOLD_CYAN="%{%}"
WHITE="%{%}"
DEFAULT="%{%}"

if [ -n "$SSH_CLIENT" ] || [ -n "$SSH_TTY" ]; then
    SESSION_TYPE=ssh
else
    SESSION_TYPE=local
fi

myprompt(){
    # Set prompt and iTerm2 tab and window titles. Label is truncated
    # cwd or name of running process. Hostname is indicated for remote
    # sessions.
    # %m is $HOST, \e]1 sets the window titlebar, \e]2 sets the tab
    if [ $SESSION_TYPE = "local" ]; then
	# sets the title to cwd
	precmd () { print -Pn "\e]1;%2~\a" ; print -Pn "\e]2;[%n@%m] %~\a" }
	# sets title to running process
	preexec () { print -Pn "\e]1;$1\a" ; print -Pn "\e]2;[%n@%m] %~ : $1\a" }
	# set prompt
	PS1="$RED%1c $BLACK%# "
    else
	# sets the title to cwd
	precmd () { print -Pn "\e]1;%m[%2~]\a" ; print -Pn "\e]2;%2~\a" }
	# sets title to running process
	preexec () { print -Pn "\e]1;%m[$1]\a" ; print -Pn "\e]2;%2~[$1]\a" }
	# set prompt
	PS1="[$GREEN%n$BLACK@$GREEN%m$BLACK] $RED%1c $BLACK%# "
    fi
}

myprompt