Set color bash prompt according to git/svn branch, and return status of last command.

git_aws_k8s_bash_prompt.sh

#!/bin/bash
#
# DESCRIPTION:
#
#   Set the bash prompt according to: (well there is k9s, but this is highly customizable as you wish; like I did :D)
#    * current AWS profile configured (really helpful if you are switching AWS accounts frequently)
#    * current context of Kubernetes(K8S) cluster ( also helpful to see which cluster you are working on
#    * the active virtualenv
#    * the branch/status of the current git repository
#    * the return value of the previous command
#    * the fact you just came from Windows and are used to having newlines in
#      your prompts.
#
# USAGE:
#
#   1. Save this file as ~/.bash_prompt (or any name and path you like)
#   2. Add the following line to the end of your ~/.bashrc or ~/.bash_profile or ~/.profile (Yeah, source it like below)
#        . ~/.bash_prompt
# AUTHOR:
#
#   Manoj Prasanna Handapangoda <[email protected]>
#
# LINEAGE:
#
#   Based on and inspired by work of Woods
#   https://gist.github.com/woods/31967

# The various escape codes that we can use to color our prompt.
        RED="\[\033[0;31m\]"
     YELLOW="\[\033[1;33m\]"
      GREEN="\[\033[0;32m\]"
       BLUE="\[\033[1;34m\]"
        MAG="\[\033[1;95m\]"
  LIGHT_RED="\[\033[1;31m\]"
LIGHT_GREEN="\[\033[1;32m\]"
      WHITE="\[\033[1;37m\]"
 LIGHT_GRAY="\[\033[0;37m\]"
 COLOR_NONE="\[\e[0m\]"


# Detect whether the current directory is a git repository.
function is_git_repository {
  git branch > /dev/null 2>&1
}

# Determine the branch/state information for this git repository.
function set_git_branch {
  # Capture the output of the "git status" command.
  git_status="$(git status 2> /dev/null)"

  # Set color based on clean/staged/dirty.
  if [[ ${git_status} =~ "working tree clean" ]]; then
    state="${GREEN}"
  elif [[ ${git_status} =~ "Changes to be committed" ]]; then
    state="${YELLOW}"
  else
    state="${LIGHT_RED}"
  fi

  # Set arrow icon based on status against remote.
  remote_pattern="# Your branch is (.*) of"
  if [[ ${git_status} =~ ${remote_pattern} ]]; then
    if [[ ${BASH_REMATCH[1]} == "ahead" ]]; then
      remote="⬆ "
    else
      remote="⬇ "
    fi
  else
    remote=""
  fi
  diverge_pattern="# Your branch and (.*) have diverged"
  if [[ ${git_status} =~ ${diverge_pattern} ]]; then
    remote="⬈"
  fi

  # Get the name of the branch.
  branch=$(git rev-parse --abbrev-ref HEAD 2> /dev/null);

  # Set the final branch string.
  BRANCH="${state}(${branch})${remote}${COLOR_NONE} "
}

function get_k8s_env(){
  CUR_K8S=$(kubectl config current-context)
}

# Return the prompt symbol to use, colorized based on the return value of the
# previous command.
function set_prompt_symbol () {
  CUR_K8S=$(kubectl config current-context)
  PROMPT_SYMBOL="${MAG}[${CUR_K8S} | ${LIGHT_RED}${AWS_PROFILE} ${MAG}]\$${COLOR_NONE}"
}


# Set the full bash prompt.
function set_bash_prompt () {
  # Set the PROMPT_SYMBOL variable. We do this first so we don't lose the
  # return value of the last command.
  set_prompt_symbol $?


  # Set the BRANCH variable.
  if is_git_repository ; then
    set_git_branch
  else
    BRANCH=''
  fi

  # Set the bash prompt variable.
  PS1="
${GREEN}${YELLOW}\w${COLOR_NONE} ${BRANCH}
${PROMPT_SYMBOL} "
}

# Tell bash to execute this function just before displaying its prompt.
PROMPT_COMMAND=set_bash_prompt

You can get a bash prompt like below. Quite useful when you have lots of clusters to connect and lots of AWS accounts to switch.