Show your git branch status (branch name, dirty state) in your bash prompt.

gitbash

# __gitdir accepts 0 or 1 arguments (i.e., location)
# returns location of .git repo
__gitdir ()
{
  if [ -z "${1-}" ]; then
		if [ -n "${__git_dir-}" ]; then
			echo "$__git_dir"
		elif [ -d .git ]; then
			echo .git
		else
			git rev-parse --git-dir 2>/dev/null
		fi
	elif [ -d "$1/.git" ]; then
		echo "$1/.git"
	else
		echo "$1"
	fi
}

# __git_ps1 accepts 0 or 1 arguments (i.e., format string)
# returns text to add to bash PS1 prompt (includes branch name)
__git_ps1 ()
{
	local g="$(__gitdir)"
	if [ -n "$g" ]; then
		local r
		local b
		if [ -f "$g/rebase-merge/interactive" ]; then
			r="|REBASE-i"
			b="$(cat "$g/rebase-merge/head-name")"
		elif [ -d "$g/rebase-merge" ]; then
			r="|REBASE-m"
			b="$(cat "$g/rebase-merge/head-name")"
		else
			if [ -d "$g/rebase-apply" ]; then
				if [ -f "$g/rebase-apply/rebasing" ]; then
					r="|REBASE"
				elif [ -f "$g/rebase-apply/applying" ]; then
					r="|AM"
				else
					r="|AM/REBASE"
				fi
			elif [ -f "$g/MERGE_HEAD" ]; then
				r="|MERGING"
			elif [ -f "$g/BISECT_LOG" ]; then
				r="|BISECTING"
			fi

			b="$(git symbolic-ref HEAD 2>/dev/null)" || {

				b="$(
				case "${GIT_PS1_DESCRIBE_STYLE-}" in
				(contains)
					git describe --contains HEAD ;;
				(branch)
					git describe --contains --all HEAD ;;
				(describe)
					git describe HEAD ;;
				(* | default)
					git describe --exact-match HEAD ;;
				esac 2>/dev/null)" ||

				b="$(cut -c1-7 "$g/HEAD" 2>/dev/null)..." ||
				b="unknown"
				b="($b)"
			}
		fi

		local w
		local i
		local s
		local u
		local c

		if [ "true" = "$(git rev-parse --is-inside-git-dir 2>/dev/null)" ]; then
			if [ "true" = "$(git rev-parse --is-bare-repository 2>/dev/null)" ]; then
				c="BARE:"
			else
				b="GIT_DIR!"
			fi
		elif [ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]; then
			if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ]; then
				if [ "$(git config --bool bash.showDirtyState)" != "false" ]; then
					git diff --no-ext-diff --ignore-submodules \
						--quiet --exit-code || w="*"
					if git rev-parse --quiet --verify HEAD >/dev/null; then
						git diff-index --cached --quiet \
							--ignore-submodules HEAD -- || i="+"
					else
						i="#"
					fi
				fi
			fi
			if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ]; then
			        git rev-parse --verify refs/stash >/dev/null 2>&1 && s="$"
			fi

			if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ]; then
			   if [ -n "$(git ls-files --others --exclude-standard)" ]; then
			      u="%"
			   fi
			fi
		fi

		if [ -n "${1-}" ]; then
			printf "$1" "$c${b##refs/heads/}$w$i$s$u$r"
		else
			printf " (%s)" "$c${b##refs/heads/}$w$i$s$u$r"
		fi
	fi
}

PS1='\u@\h:\w$(__git_ps1 "(%s)")\$ '
GIT_PS1_SHOWDIRTYSTATE=true