A fancy two-line #!/bin/bash prompt with $(git integration)

bender-bash-prompt

#
# Fancy two-line prompt with git integration
#
# ┌───=[ specious :: sharp -( 0 )-[ ~ ]-( master )
# └──(
#

git_current_head () {                                                                                                          
  git symbolic-ref --short HEAD 2>/dev/null || git rev-parse --short HEAD                                                      
}                                                                                                                              
                                                                                                                               
git_dirty_mark () {                                                                                                            
  [[ -n $(git status -s | head -c 1) ]] && echo \*
}                                                                                                                              
                                                                                                                               
show_git_prompt () {                                                                                                           
  git branch 2>/dev/null 1>&2 && echo -e "-( \e[34;1m$(git_current_head)$(git_dirty_mark)\e[31;1m )"                           
}

if [[ -n $(type -t git) ]] ; then
  PS1="\$(show_git_prompt)"
else
  PS1=
fi

PS1="
\[\e[31;1m\]┌───=[ \[\e[39;1m\]\u\[\e[31;1m\] :: \[\e[33;1m\]\h\[\e[31;1m\] ]-( \[\e[39;1m\]\j\[\e[31;1m\] )-[ \[\e[39;1m\]\w\[\e[31;1m\] ]$PS1
\[\e[31;1m\]└──( \[\e[0m\]"

# Display running command in GNU Screen window status
#
# In .screenrc, set: shelltitle "( |~"
#
# See: http://aperiodic.net/screen/title_examples#setting_the_title_to_the_name_of_the_running_program
case $TERM in screen*)
  PS1=${PS1}'\[\033k\033\\\]'
esac