Show git branch in bash terminal

.profile

# Install https://github.com/git/git/blob/master/contrib/completion/git-prompt.sh to ~.git-prompt.sh

# Add to code below to ~.profile
# store colors                                                                                           
MAGENTA="\[\033[0;35m\]"                                                                                 
YELLOW="\[\033[01;33m\]"                                                                                 
BLUE="\[\033[00;34m\]"                                                                                   
LIGHT_GRAY="\[\033[0;37m\]"                                                                              
CYAN="\[\033[0;36m\]"                                                                                    
GREEN="\[\033[32m\]"                                                                                     
RED="\[\033[0;31m\]"                                                                                     
VIOLET='\[\033[01;35m\]'                                                                                 
                                                                                                         
function color_my_prompt {                                                                               
  local __user_and_host="$GREEN\u@\h"                                                                    
  local __cur_location="$GREEN\w"           # capital 'W': current directory, small 'w': full file path  
  local __git_branch_color="$LIGHT_GRAY"                                                                 
  local __prompt_tail="$VIOLET$"                                                                         
  local __user_input_color="$LIGHT_GRAY"                                                                 
  local __git_branch='$(__git_ps1)';                                                                     
                                                                                                         
  # colour branch name depending on state                                                                
  if [[ "$(__git_ps1)" =~ "*" ]]; then     # if repository is dirty                                                
      __git_branch_color="$RED"                                                                                    
  elif [[ "$(__git_ps1)" =~ "$" ]]; then   # if there is something stashed                                         
      __git_branch_color="$YELLOW"                                                                                 
  elif [[ "$(__git_ps1)" =~ "%" ]]; then   # if there are only untracked files                                     
      __git_branch_color="$RED"                                                                                    
  elif [[ "$(__git_ps1)" =~ "+" ]]; then   # if there are staged files                                             
      __git_branch_color="$CYAN"                                                                                   
  fi                                                                                                               
                                                                                                                   
  # Build the PS1 (Prompt String)                                                                                  
  # PS1="$__user_and_host $__cur_location$__git_branch_color$__git_branch $__prompt_tail$__user_input_color "      
  PS1="$__cur_location$__git_branch_color$__git_branch $__prompt_tail$__user_input_color "                         
}           

# configure PROMPT_COMMAND which is executed each time before PS1            
export PROMPT_COMMAND=color_my_prompt                                        
                                                               
# if .git-prompt.sh exists, set options and execute it                       
if [ -f ~/.git-prompt.sh ]; then                                             
  GIT_PS1_SHOWDIRTYSTATE=true                                                
  GIT_PS1_SHOWSTASHSTATE=true                                                
  GIT_PS1_SHOWUNTRACKEDFILES=true                                            
  GIT_PS1_SHOWUPSTREAM="auto"                                                
  GIT_PS1_HIDE_IF_PWD_IGNORED=true                                           
  GIT_PS1_SHOWCOLORHINTS=true                                                
  . ~/.git-prompt.sh                                                         
fi