My bash prefix (PS1)

.bash_profile

# Return current git branch prefixed with |, nothing if not in git repo
parse_git_branch() {
  git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\|\1/'
}

# Returns some "dirty" flags if they apply, nothing if not in git repo,
# or current branch is clean.
# Flags: M = modified files, ? = untracked files, % = unresolved merges
# These flags are prefixed with a |
parse_git_dirty() {
  _gst_output=$(git status --porcelain 2> /dev/null)
  _output=""
  if [[ ! "$_gst_output" = "" ]]; then
    if [[ ! $(git status --porcelain 2> /dev/null | grep ^\ M\ ) = "" ]]; then
      _output="M"
    fi
    if [[ ! $(git status --porcelain 2> /dev/null | grep ^??) = "" ]]; then
      _old_output=$_output
      _output="?$_old_output"
    fi
    if [[ ! $(git status --porcelain 2> /dev/null | grep ^Unmerged\ paths:) = "" ]]; then
      _old_output=$_output
      _output="%$_old_output"
    fi
    echo "|$_output"
  fi
}

#Format a nice command line prefix including current git branch
# Colors are ugly to do in bash.
# Output format = <user>@<host>:<path>[|<git branch>][|<git dirty flags>]
PS1="\[\033[01;36m\]\u\[\033[00m\]\[\033[01;30m\]@\h\[\033[00m\]:\[\033[00;37m\]\w\[\033[33m\]\$(parse_git_branch)\[\033[00m\]\[\033[00;31m\]\$(parse_git_dirty)\[\033[00m\] >> "

# non-colored version:
# PS1="\u@\h:\w|\$(parse_git_branch)\$(parse_git_dirty) >> "

screenshot.md

Here's a screenshot of it on my computer, with untracked files and modified files.