PS1 prompt that includes git branch + colour code for committed/uncommitted changes

git_ps1.sh

#  Customise BASH PS1 prompt to show current GIT branch, colour coded to inform user if there are any uncomitted changes.
#  by Cathal Browne - http://ninjazebra.com

# Inspired by http://mediadoneright.com/content/ultimate-git-ps1-bash-prompt


### Detects if your current directory is a git repository
### If a git repository
#### Displays current branch name:
#####  in green if no uncommited changes 
#####  in red if there are uncommitted changes
#####  with a underline if there are committed changes that are not pushed to git server
#####  with a § symbol beside it, if there are unpulled changes on the git server

Color_Off="\[\033[0m\]"       # Text Reset

# Regular Colors
Black="\[\033[0;30m\]"        # Black
Red="\[\033[0;31m\]"          # Red
Green="\[\033[0;32m\]"        # Green
Yellow="\[\033[0;33m\]"       # Yellow
Blue="\[\033[0;34m\]"         # Blue
Purple="\[\033[0;35m\]"       # Purple
Cyan="\[\033[0;36m\]"         # Cyan
White="\[\033[0;37m\]"        # White

# Bold
BBlack="\[\033[1;30m\]"       # Black
BRed="\[\033[1;31m\]"         # Red
BGreen="\[\033[1;32m\]"       # Green
BYellow="\[\033[1;33m\]"      # Yellow
BBlue="\[\033[1;34m\]"        # Blue
BIPurple="\[\033[1;35m\]"      # Purple
BCyan="\[\033[1;36m\]"        # Cyan
BWhite="\[\033[1;37m\]"       # White

# Underline
UBlack="\[\033[4;30m\]"       # Black
URed="\[\033[4;31m\]"         # Red
UGreen="\[\033[4;32m\]"       # Green
UYellow="\[\033[4;33m\]"      # Yellow
UBlue="\[\033[4;34m\]"        # Blue
UPurple="\[\033[4;35m\]"      # Purple
UCyan="\[\033[4;36m\]"        # Cyan
UWhite="\[\033[4;37m\]"       # White

# Background
On_Black="\[\033[40m\]"       # Black
On_Red="\[\033[41m\]"         # Red
On_Green="\[\033[42m\]"       # Green
On_Yellow="\[\033[43m\]"      # Yellow
On_Blue="\[\033[44m\]"        # Blue
On_Purple="\[\033[45m\]"      # Purple
On_Cyan="\[\033[46m\]"        # Cyan
On_White="\[\033[47m\]"       # White

# High Intensty
IBlack="\[\033[0;90m\]"       # Black
IRed="\[\033[0;91m\]"         # Red
IGreen="\[\033[0;92m\]"       # Green
IYellow="\[\033[0;93m\]"      # Yellow
IBlue="\[\033[0;94m\]"        # Blue
IPurple="\[\033[0;95m\]"      # Purple
ICyan="\[\033[0;96m\]"        # Cyan
IWhite="\[\033[0;97m\]"       # White

# Bold High Intensty
BIBlack="\[\033[1;90m\]"      # Black
BIRed="\[\033[1;91m\]"        # Red
BIGreen="\[\033[1;92m\]"      # Green
BIYellow="\[\033[1;93m\]"     # Yellow
BIBlue="\[\033[1;94m\]"       # Blue
BIPurple="\[\033[1;95m\]"     # Purple
BICyan="\[\033[1;96m\]"       # Cyan
BIWhite="\[\033[1;97m\]"      # White

# High Intensty backgrounds
On_IBlack="\[\033[0;100m\]"   # Black
On_IRed="\[\033[0;101m\]"     # Red
On_IGreen="\[\033[0;102m\]"   # Green
On_IYellow="\[\033[0;103m\]"  # Yellow
On_IBlue="\[\033[0;104m\]"    # Blue
On_IPurple="\[\033[10;95m\]"  # Purple
On_ICyan="\[\033[0;106m\]"    # Cyan
On_IWhite="\[\033[0;107m\]"   # White

user="\u"
host="\h"
path="\w"
divider="$"
at="@"
spacer=" "
new_line="\n\r"

export PS1=$BIRed$user$BIGreen$at$BIYellow$host$spacer$BICyan$path'$(git branch &>/dev/null
if [ "$?" = "0" ]; then
  git fetch origin &>/dev/null
  branch_name=$(git symbolic-ref -q HEAD)
  branch_name=${branch_name##refs/heads/}
  branch_name=${branch_name:-HEAD}  
  unpushed_local_changes=`git log --oneline origin/$branch_name..$branch_name`

  branch_name_color="'$BWhite'"   
  echo "$(echo `git status` | grep "nothing to commit" > /dev/null 2>&1
  if [ "$?" = "0" ]; then
    if [ "$unpushed_local_changes" != "" ]; then 
      branch_name_color="'$UGreen'"
    else
      branch_name_color="'$Green'"
    fi
  else
    if [ "$unpushed_local_changes" != "" ]; then 
      branch_name_color="'$URed'"
    else
      branch_name_color="'$Red'"
    fi       
  fi
 
  unpulled_commits_marker=""
  unpulled_commits=`git log HEAD..origin/$branch_name --oneline`
  if [ "$unpulled_commits" != "" ]; then 
    unpulled_commits_marker="'$Purple$spacer'§"    
  fi
  echo "'$spacer$BWhite'[$branch_name_color$branch_name$unpulled_commits_marker'$Color_Off$BWhite']" 
  )"    
fi 
)'$spacer$BWhite$divider$White$spacer