I’m mainly using zsh but I have a backup bash prompt that closely mirrors it. It shows the return value of the previous command if it’s non-zero and gives some information about the current git repository if there is one.
retval() {
if [ $? -eq 0 ]; then
printf ""
else
printf "\001\e[31m\002($?)\001\e[0m\002"
fi
}
gitbranch() {
if type git 2> /dev/null 1> /dev/null && git rev-parse 2> /dev/null 1> /dev/null ; then
MODIFIED=""
if [[ -n $(git status --short) ]]; then
MODIFIED=" M"
fi
BRANCH=$(git rev-parse --abbrev-ref HEAD)
SHORTREF=$(git rev-parse --short HEAD)
printf "\001\e[31m\002%s\001\e[0m\002(%s)\001\e[31m\002%s\001\e[0m\002" $BRANCH $SHORTREF $MODIFIED
else
echo -n ""
fi
}
export PROMPT_DIRTRIM=3
PS1='$(retval)[\001\e[1;95m\002\u\001\e[0m\002@\h : \w $(gitbranch)] \$ '
PS2='> '
I mean the function syntax is pretty much just taken from Lambda Calculus.