Pesonalized KieranP's work at https://gist.github.com/KieranP/92895

.bash_profile

NO_COLOR='\e[0m' #disable any colors
BLACK='\e[0;30m'
RED='\e[0;31m'
GREEN='\e[0;32m'
YELLOW='\e[0;33m'
BLUE='\e[0;34m'
MAGENTA='\e[0;35m'
CYAN='\e[0;36m'
WHITE='\e[0;37m'

parse_git_branch_and_status() {
  ruby ~/.git-prompt.rb
}
export PS1="\[$PS_COLOR\]\u:\[$GREEN\]\w \$(parse_git_branch_and_status)\[$YELLOW\]\n\$\[$NO_COLOR\] "

.git-prompt.rb

#!/usr/bin/env ruby
 
class GitConsoleStats
 
  COLORS = { 
    black: "\033[0;30m",
    red: "\033[0;31m",
    green: "\033[0;32m",
    yellow: "\033[0;33m",
    blue: "\033[0;34m",
    magenta: "\033[0;35m",
    cyan: "\033[0;36m",
    white: "\033[0;37m"
  }

  @@default_color = COLORS[:green]
  @@user_color = COLORS[:cyan]
  @@branch_color = COLORS[:yellow]
  @@modified_color = COLORS[:red]
  @@not_modified_color = COLORS[:green]
 
  def print
    return if git_status.nil? || git_status.empty? || git_status.include?('fatal')
 
    info = Array.new
    info << "#{untracked_files_count} untracked" if untracked_files_count > 0
    info << "#{new_files_count} new" if new_files_count > 0
    info << "#{modified_files_count} modified" if modified_files_count > 0
    info << "#{deleted_files_count} deleted" if deleted_files_count > 0
    info << "#{renamed_files_count} renamed" if renamed_files_count > 0
    info << "#{copied_files_count} copied" if copied_files_count > 0
    info << "#{merge_conflicts_count} merge conflict#{'s' if merge_conflicts_count > 1}" if merge_conflicts_count > 0
 
    modified_info = "#{@@modified_color}#{info.join(', ')} " if info.size > 0
    puts "#{@@branch_color}(#{branch_name})#{@@default_color} #{modified_info}"
  end
 
  def git_status
    @@git_status ||= `git status -sb 2>/dev/null`
  end
 
  def branch_name
    @@branch_name ||= git_status =~ /^##\s([^\[$\n]*)/ ? $1.strip.split('...').first : '[unknown branch]'
  end
 
  def untracked_files_count
    @@untracked_files_count ||= git_status.scan(/^\?\?/).size
  end
 
  def new_files_count
    @@new_files_count ||= git_status.scan(/^(A|\s)(A|\s)/).size
  end
 
  def modified_files_count
    @@modified_files_count ||= git_status.scan(/^(M|\s)(M|\s)/).size
  end
 
  def deleted_files_count
    @@deleted_files_count ||= git_status.scan(/^(D|\s)(D|\s)/).size
  end
 
  def renamed_files_count
    @@renamed_files_count ||= git_status.scan(/^(R|\s)(R|\s)/).size
  end
 
  def copied_files_count
    @@copied_files_count ||= git_status.scan(/^(C|\s)(C|\s)/).size
  end
 
  def merge_conflicts_count
    @@merge_conflicts_count ||= git_status.scan(/^(D|U|T|\s)(D|U|T|\s)/).size
  end
 
end
 
GitConsoleStats.new.print