A custom terminal (Bash) prompt which shows name and state of the current Git branch (if available). Brings together ideas from https://gist.github.com/joemaller/4503986 and https://gist.github.com/joemaller/4527475

Git-branch aware Bash prompt .bashrc .sh

# https://gist.github.com/joemaller/3165ace4b1f8a50924990ad373236ce8
# 
# Append this file to the end of your ~/.bashrc file
# Your terminal prompt will look something like this:
#
#    username@hostname /output/of/pwd [git-branch]$ 


# https://gist.github.com/4503986
# 
# A set of color functions to help with fancy $PS1 prompts
#
# This: 
#     PROMPT_COMMAND='PS1="\e[32;1m\]\u@\[\e[35;1m\]\H \[\e[0m\]\w]\$ "''
#
# Can be more clearly written as:
#     PROMPT_COMMAND='PS1="$(DARK_GREEN \\u@)$(PURPLE \\H) \w]\$ "''
#
# note: Escape codes returned from these functions will not work in a directly 
#       assigned $PS1, use PROMPT_COMMAND to prevent extra escaping.
#

# Text Colors
function RED         { echo "\[\e[0;91m\]$1\[\e[0m\]"; }
function DARK_RED    { echo "\[\e[0;31m\]$1\[\e[0m\]"; }
function YELLOW      { echo "\[\e[0;93m\]$1\[\e[0m\]"; }
function DARK_YELLOW { echo "\[\e[0;33m\]$1\[\e[0m\]"; }
function GREEN       { echo "\[\e[0;92m\]$1\[\e[0m\]"; }
function DARK_GREEN  { echo "\[\e[0;32m\]$1\[\e[0m\]"; }
function CYAN        { echo "\[\e[0;96m\]$1\[\e[0m\]"; }
function DARK_CYAN   { echo "\[\e[0;36m\]$1\[\e[0m\]"; }
function BLUE        { echo "\[\e[0;94m\]$1\[\e[0m\]"; }
function DARK_BLUE   { echo "\[\e[0;34m\]$1\[\e[0m\]"; }
function MAGENTA     { echo "\[\e[0;95m\]$1\[\e[0m\]"; }
function PURPLE      { echo "\[\e[0;35m\]$1\[\e[0m\]"; }
function BLACK       { echo "\[\e[0;30m\]$1\[\e[0m\]"; }
function GRAY        { echo "\[\e[0;90m\]$1\[\e[0m\]"; }
function LIGHT_GRAY  { echo "\[\e[0;37m\]$1\[\e[0m\]"; }
function WHITE       { echo "\[\e[0;97m\]$1\[\e[0m\]"; }

# Black on Background Color
function B_ON_RED         { echo "\[\e[0;30;101m\]$1\[\e[0m\]"; }
function B_ON_DARK_RED    { echo "\[\e[0;30;41m\]$1\[\e[0m\]"; }
function B_ON_YELLOW      { echo "\[\e[0;30;103m\]$1\[\e[0m\]"; }
function B_ON_DARK_YELLOW { echo "\[\e[0;30;43m\]$1\[\e[0m\]"; }
function B_ON_GREEN       { echo "\[\e[0;30;102m\]$1\[\e[0m\]"; }
function B_ON_DARK_GREEN  { echo "\[\e[0;30;42m\]$1\[\e[0m\]"; }
function B_ON_CYAN        { echo "\[\e[0;30;106m\]$1\[\e[0m\]"; }
function B_ON_DARK_CYAN   { echo "\[\e[0;30;46m\]$1\[\e[0m\]"; }
function B_ON_BLUE        { echo "\[\e[0;30;104m\]$1\[\e[0m\]"; }
function B_ON_DARK_BLUE   { echo "\[\e[0;30;44m\]$1\[\e[0m\]"; }
function B_ON_MAGENTA     { echo "\[\e[0;30;105m\]$1\[\e[0m\]"; }
function B_ON_PURPLE      { echo "\[\e[0;30;45m\]$1\[\e[0m\]"; }
function B_ON_BLACK       { echo "\[\e[0;30;40m\]$1\[\e[0m\]"; }
function B_ON_DARK_GRAY   { echo "\[\e[0;30;100m\]$1\[\e[0m\]"; }
function B_ON_GRAY        { echo "\[\e[0;30;47m\]$1\[\e[0m\]"; }
function B_ON_LIGHT_GRAY  { echo "\[\e[0;30;107m\]$1\[\e[0m\]"; }

# White on Background Color
function W_ON_RED         { echo "\[\e[0;97;101m\]$1\[\e[0m\]"; }
function W_ON_DARK_RED    { echo "\[\e[0;97;41m\]$1\[\e[0m\]"; }
function W_ON_YELLOW      { echo "\[\e[0;97;103m\]$1\[\e[0m\]"; }
function W_ON_DARK_YELLOW { echo "\[\e[0;97;43m\]$1\[\e[0m\]"; }
function W_ON_GREEN       { echo "\[\e[0;97;102m\]$1\[\e[0m\]"; }
function W_ON_DARK_GREEN  { echo "\[\e[0;97;42m\]$1\[\e[0m\]"; }
function W_ON_CYAN        { echo "\[\e[0;97;106m\]$1\[\e[0m\]"; }
function W_ON_DARK_CYAN   { echo "\[\e[0;97;46m\]$1\[\e[0m\]"; }
function W_ON_BLUE        { echo "\[\e[0;97;104m\]$1\[\e[0m\]"; }
function W_ON_DARK_BLUE   { echo "\[\e[0;97;44m\]$1\[\e[0m\]"; }
function W_ON_MAGENTA     { echo "\[\e[0;97;105m\]$1\[\e[0m\]"; }
function W_ON_PURPLE      { echo "\[\e[0;97;45m\]$1\[\e[0m\]"; }
function W_ON_BLACK       { echo "\[\e[0;97;40m\]$1\[\e[0m\]"; }
function W_ON_DARK_GRAY   { echo "\[\e[0;97;100m\]$1\[\e[0m\]"; }
function W_ON_GRAY        { echo "\[\e[0;97;47m\]$1\[\e[0m\]"; }
function W_ON_LIGHT_GRAY  { echo "\[\e[0;97;107m\]$1\[\e[0m\]"; }

# https://gist.github.com/joemaller/4527475
# 
# A simple bash function for coloring the current git branch. 
# - Red: Tree is dirty
# - Yellow: All modified files are staged
# - Green: Tree is clean
#
# This uses the color functions from https://gist.github.com/4503986

function git_branch() {
  is_git=$(git status --porcelain 2> /dev/null ) || return
  branch=$(git symbolic-ref --short HEAD 2> /dev/null)
  if [ -z "$branch" ]; then
    branch=$(git status | sed -n 1p )
  fi
  is_dirty=$(git update-index --refresh 2> /dev/null)
  is_staged=$(git diff-index --cached HEAD 2> /dev/null)
  if [ -n "$is_dirty" ]; then
    echo $(DARK_RED "[$branch]")
  elif [ -n "$is_staged" ]; then
    echo $(DARK_YELLOW "[$branch]")
  else
    echo $(DARK_GREEN "[$branch]")
  fi
}

# Variable definitions:
# \u  current user's name
# \h  hostname to first dot
# \w  current working directory

function set_ps1() {
    PS1="🌈 $(DARK_CYAN \\u)@$(DARK_CYAN \\h) $(GRAY \\w) $(git_branch)$(CYAN \\$) "
}

PROMPT_COMMAND="set_ps1; $PROMPT_COMMAND"