How to change bash prompt color based on exit code of last command?

Question

I want to display a green smile face if the previous exit code is 0 and red smile face if not successful.

Basically I want to do this prompt but with other stuff in

Answer 1

This works for me:

export PS1="\
\$(if [[ \$? -gt 0 ]]; then printf \"\\[\\033[01;31m\\]\xF0\x9F\x98\xA7\"; else printf \"\\[\\033[01;32m\\]\xF0\x9F\x98\x83\"; fi)\
\[\033[01;30m\]\u\
\[\033[01;33m\]@\
\[\033[01;36m\]\h \
\[\033[01;33m\]\w \
\[\033[01;31m\][\$(__git_ps1 '%s')] \
\[\033[01;35m\]\\$ \
\[\033[00m\]\
"