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Windows (Cygwin) Show Git dirty status in your Unix bash prompt

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RED="\[\033[0;31m\]"
YELLOW="\[\033[0;33m\]"
GREEN="\[\033[0;32m\]"
BLUE="\[\033[0;34m\]"
LIGHT_RED="\[\033[1;31m\]"
LIGHT_GREEN="\[\033[1;32m\]"
WHITE="\[\033[1;37m\]"
LIGHT_GRAY="\[\033[0;37m\]"
COLOR_NONE="\[\e[0m\]"
 
function parse_git_branch {
 
git rev-parse --git-dir &> /dev/null
git_status="$(git status 2> /dev/null)"
branch_pattern="^# On branch ([^${IFS}]*)"
remote_pattern="# Your branch is (.*) of"
diverge_pattern="# Your branch and (.*) have diverged"
if [[ ! ${git_status}} =~ "working directory clean" ]]; then
state="${RED}Z"
fi
# add an else if or two here if you want to get more specific
if [[ ${git_status} =~ ${remote_pattern} ]]; then
if [[ ${BASH_REMATCH[1]} == "ahead" ]]; then
remote="${YELLOW}^"
else
remote="${YELLOW}v"
fi
fi
if [[ ${git_status} =~ ${diverge_pattern} ]]; then
remote="${YELLOW}^v"
fi
if [[ ${git_status} =~ ${branch_pattern} ]]; then
branch=${BASH_REMATCH[1]}
echo " (${branch})${remote}${state}"
fi
}
 
function prompt_func() {
previous_return_value=$?;
# prompt="${TITLEBAR}$BLUE[$RED\w$GREEN$(__git_ps1)$YELLOW$(git_dirty_flag)$BLUE]$COLOR_NONE "
prompt="${TITLEBAR}${BLUE}[${RED}\w${GREEN}$(parse_git_branch)${BLUE}]${COLOR_NONE} "
if test $previous_return_value -eq 0
then
PS1="${prompt}"
else
PS1="${prompt}${RED}${COLOR_NONE} "
fi
}
 
PROMPT_COMMAND=prompt_func
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