Command prompt customisation to show git branch and status

.bashrc

RED="\[\033[0;31m\]"
YELLOW="\[\033[0;33m\]"
GREEN="\[\033[0;32m\]"
CYAN="\[\033[0;36m\]"
NO_COLOUR="\[\033[0m\]"

GIT_PROMPT_PREFIX="[git:"
GIT_PROMPT_SUFFIX="]$NO_COLOUR "
GIT_PROMPT_DIRTY="$RED+"
GIT_PROMPT_CLEAN="$GREEN"

function git_current_branch()
{
	echo "$(git branch 2>/dev/null | sed -n '/^\*/s/^\* //p')"
}

function git_parse_dirty()
{
	if [[ -n $(git status -s 2> /dev/null) ]]; then
		echo "$GIT_PROMPT_DIRTY"
	else
		echo "$GIT_PROMPT_CLEAN"
	fi
}

function git_prompt_info()
{
	if ! git rev-parse --git-dir > /dev/null 2>&1; then
		return 0
	fi

	echo "$(git_parse_dirty)$GIT_PROMPT_PREFIX$(git_current_branch)$GIT_PROMPT_SUFFIX"
}

function prompt_line()
{
	printf "%s: %s%s" "$CYAN\u" "$YELLOW\w $(git_prompt_info)$NO_COLOUR" "→ "
}

PROMPT_COMMAND='PS1="$(prompt_line)"'

Preview of the script above