My personal Bash prompt template

.bash_prompt

# My personal bash prompt template
# (c) Alexander Kashev, 2017-2019

# To use, copy to home and add to .bashrc:
#
# if [ -f $HOME/.bash_prompt ]; then
#     # For cluster machines: appends suffix if short hostname not equal to it
#     PS1_CLUSTER_NAME=''
#     . $HOME/.bash_prompt
# fi

getPS1_truncatePath() {
  if [[ $1 == '/' ]] ; then
    echo ""
  else
    echo $1 | sed s,^$HOME,~, | sed s,[^/]*$,,
  fi
}

getPS1_hostColor() {
  local Hostname=$1
  if (( $(tput colors) > 255 )); then
    echo "38;5;$(((((0x$(echo ${Hostname} | md5sum | cut -f 1 -d " ") % 215) + 215) % 215) + 17))m"
  else
    echo "$(((((0x$(echo ${Hostname} | md5sum | cut -f 1 -d " ") % 15) + 15) % 15) + 31))m"
  fi
}

getPS1() {
  # For cluster machines: appends suffix if short hostname not equal to it
  local HostnameSuffix=$PS1_CLUSTER_NAME

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

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

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

  local NC="\[\e[m\]"               # Color Reset

  if [[ ${EUID} == 0 ]] ; then
    local UserColor=$BRed
    local PromptSymbol="${BWhite}#${NC}"
  else
    local UserColor=$BGreen
    local PromptSymbol="${BWhite}\$${NC}"
  fi

  local User="${UserColor}\u${NC}"

  if [[ -n $(type -t __git_ps1) ]] ; then
    local GitPromptText='$(__git_ps1 " (%s)")'
    local GitPrompt="${BYellow}${GitPromptText}${NC}"
  else
    local GitPrompt=""
  fi

  local TruncatedPath='$(getPS1_truncatePath \w)'
  local HighlightedPath="${BBlue}${TruncatedPath}${BCyan}\W"

  local HostColor="$(getPS1_hostColor $(hostname))"
  if [[ ${HostnameSuffix} && $(hostname -s) != ${HostnameSuffix} ]] ; then
    local SuffixColor="$(getPS1_hostColor ${HostnameSuffix})"
    local AtHostname="\[\e[1;${HostColor}\]@\h\[\e[0;${SuffixColor}\].${HostnameSuffix}${NC}"
  else
    local AtHostname="\[\e[1;${HostColor}\]@\h${NC}"
  fi

  local WindowTitle="\u@\h:\w"
  local WindowTitleUpdate="\[\e]2;${WindowTitle}\a\]"

  local Prompt="${User}${AtHostname}:${HighlightedPath}${GitPrompt}\n${WindowTitleUpdate}${PromptSymbol} "

  echo "$Prompt"
}

GIT_PS1_SHOWDIRTYSTATE=1
GIT_PS1_SHOWSTASHSTATE=1
GIT_PS1_SHOWUNTRACKEDFILES=1
GIT_PS1_SHOWUPSTREAM="auto"
GIT_PS1_SHOWCOLORHINTS=1

PS1=$(getPS1)

# To merge history from different sessions, append on every command
export PROMPT_COMMAND="history -a"