Add this to your ~/.bash_profile to get the git branch (and some coloring for your prompt)

.bash_profile

export CLICOLOR=1
export LSCOLORS=ExFxBxDxCxegedabagacad

## ANSI color codes
RS="\[\033[0m\]" # reset
HC="\[\033[1m\]" # hicolor
UL="\[\033[4m\]" # underline
INV="\[\033[7m\]" # inverse background and foreground
FBLK="\[\033[30m\]" # foreground black
FRED="\[\033[31m\]" # foreground red
FGRN="\[\033[32m\]" # foreground green
FYEL="\[\033[33m\]" # foreground yellow
FBLE="\[\033[34m\]" # foreground blue
FMAG="\[\033[35m\]" # foreground magenta
FCYN="\[\033[36m\]" # foreground cyan
FWHT="\[\033[37m\]" # foreground white
BBLK="\[\033[40m\]" # background black
BRED="\[\033[41m\]" # background red
BGRN="\[\033[42m\]" # background green
BYEL="\[\033[43m\]" # background yellow
BBLE="\[\033[44m\]" # background blue
BMAG="\[\033[45m\]" # background magenta
BCYN="\[\033[46m\]" # background cyan
BWHT="\[\033[47m\]" # background white modifying prompt

# https://github.com/jimeh/git-aware-prompt
find_git_branch() {
  local branch
  if branch=$(git rev-parse --abbrev-ref HEAD 2> /dev/null); then
    if [[ "$branch" == "HEAD" ]]; then
      branch=' detached*'
    fi
    git_branch=" ($branch)"
  else
    git_branch=""
  fi
}

find_git_dirty() {
  local status=$(git status --porcelain 2> /dev/null)
  if [[ "$status" != "" ]]; then
    git_dirty=' *'
  else
    git_dirty=''
  fi
}

PROMPT_COMMAND="find_git_branch; find_git_dirty; $PROMPT_COMMAND"
PS1="$HC$FBLE$FGRN\w$FWHT\$git_branch$FRED\$git_dirty $HC$FBLE\$ $RS"