Git repo bash prompt

.bash_git

IBlack="\[\033[0;90m\]"       # High-intensity Black
BYellow="\[\033[1;33m\]"      # Bold Yellow
Green="\[\033[0;32m\]"        # Green
IRed="\[\033[0;91m\]"         # High-intensity Red
Yellow="\[\033[0;33m\]"       # Yellow
Color_Off="\[\033[0m\]"       # Text Reset

# Bash prompt for Git repos, based on
# http://mediadoneright.com/content/ultimate-git-ps1-bash-prompt but inserts
# the branch/dirty marker in the path.
export PS1="
$IBlack \t $BYellow"'$(
  git branch &> /dev/null;
  if [ $? -eq 0 ]; then
    echo $(pwd | sed s:$(pwd -P | sed s:^$(git rev-parse --show-toplevel)::)$:: | sed s:$HOME:~:)$(
      git status | grep "nothing to commit" > /dev/null 2>&1;
      if [ $? -eq 0 ];
        then echo '"'$Green'"'$(__git_ps1 " (%s)");
        else echo '"'$Red'"'$(__git_ps1 " {%s}");
      fi
    )'"'$BYellow'"'$(
      echo $(pwd -P) | sed s:$(git rev-parse --show-toplevel)::g
    );
  else
    echo "\w";
  fi
)'$Color_Off' $ '