.bash_prompt

#!/bin/bash
# Shell prompt based on the Solarized Dark theme.
# Screenshot: http://i.imgur.com/EkEtphC.png
# Heavily inspired by @necolas’s prompt: https://github.com/necolas/dotfiles
# iTerm → Profiles → Text → use 13pt Monaco with 1.1 vertical spacing.
# vim: set filetype=sh :

if [[ $COLORTERM = gnome-* && $TERM = xterm ]] && infocmp gnome-256color >/dev/null 2>&1; then
	export TERM='gnome-256color';
elif infocmp rxvt-unicode-256color >/dev/null 2>&1; then
	export TERM='rxvt-unicode';
elif infocmp xterm-256color >/dev/null 2>&1; then
	export TERM='xterm-256color';
fi;


prompt_kube() {
	if [ ! -f $HOME/.kube/config ]; then
		return;
	fi
	contextName=$(kubectl config view -o=jsonpath='{.current-context}')
	namespace="$(kubectl config view -o=jsonpath="{.contexts[?(@.name==\"${contextName}\")].context.namespace}")" \
     || exit_err "error getting current namespace"
	if [[ -z "${namespace}" ]]; then namespace=default; fi;
	echo -e "${1}${white}(kube:${violet}${contextName}${white}/${blue}${namespace}${white})";
}

prompt_git() {
	local s='';
	local ahead=0;
	local behind=0;
	local branchName='';
	local remote_commit='';

	# Check if the current directory is in a Git repository.
	if [ "$(git rev-parse --is-inside-work-tree &>/dev/null; echo "${?}")" == '0' ]; then

		# check if the current directory is in .git before running git checks
		if [ "$(git rev-parse --is-inside-git-dir 2> /dev/null)" == 'false' ]; then

			if [[ -O "$(git rev-parse --show-toplevel)/.git/index" ]]; then
				git update-index --really-refresh -q &> /dev/null;
			fi;

			# Check for uncommitted changes in the index.
			if ! git diff --quiet --ignore-submodules --cached; then
				s+='+';
			fi;

			# Check for unstaged changes.
			if ! git diff-files --quiet --ignore-submodules --; then
				s+='!';
			fi;

			# Check for untracked files.
			if [ -n "$(git ls-files --others --exclude-standard)" ]; then
				s+='?';
			fi;

			# Check for stashed files.
			if git rev-parse --verify refs/stash &>/dev/null; then
				s+='$';
			fi;

		fi;

		# Get the short symbolic ref.
		# If HEAD isn’t a symbolic ref, get the short SHA for the latest commit
		# Otherwise, just give up.
		branchName="$(git symbolic-ref --quiet --short HEAD 2> /dev/null || \
			git rev-parse --short HEAD 2> /dev/null || \
			echo '(unknown)')";

		# check if the current directory is in .git before running git checks
		if [ "$(git rev-parse --is-inside-git-dir 2> /dev/null)" == 'false' ]; then

			remote_commit=$(git ls-remote --exit-code . origin/${branchName} 2>/dev/null)
			if [ -n "${remote_commit}" ]; then

				# Check if it is ahead of or behind origin
				ahead=$(git rev-list --count origin/${branchName}.. 2>/dev/null);
				behind=$(git rev-list --count ..origin/${branchName} 2>/dev/null);

				if [ $ahead -ne 0 ] && [ $behind -ne 0 ]; then
					branchName+=" diverged ${behind}< ${ahead}>";
				elif [ $behind -ne 0 ]; then
					branchName+=" ${behind}<origin";
				elif [ $ahead -ne 0 ]; then
					branchName+=" ${ahead}>origin";
				fi;
			else
				branchName+=" (local-only)"
			fi;

		fi;

		[ -n "${s}" ] && s=" [${s}]";

		echo -e "${1}${branchName}${blue}${s}";
	else
		return;
	fi;
}

cloud=""
if [[ -f /proc/cpuinfo ]] && grep -q "^flags.* hypervisor" /proc/cpuinfo && [[ ! -d "/mnt/c/Windows/" ]]; then
	cloud="☁️ "
fi

if tput setaf 1 &> /dev/null; then
	tput sgr0; # reset colors
	bold=$(tput bold);
	reset=$(tput sgr0);
	# Solarized colors, taken from http://git.io/solarized-colors.
	black=$(tput setaf 0);
	blue=$(tput setaf 33);
	cyan=$(tput setaf 37);
	green=$(tput setaf 64);
	orange=$(tput setaf 166);
	purple=$(tput setaf 125);
	red=$(tput setaf 124);
	violet=$(tput setaf 61);
	white=$(tput setaf 15);
	yellow=$(tput setaf 136);
else
	bold='';
	reset="\\e[0m";
	# shellcheck disable=SC2034
	black="\\e[1;30m";
	blue="\\e[1;34m";
	cyan="\\e[1;36m";
	green="\\e[1;32m";
	# shellcheck disable=SC2034
	orange="\\e[1;33m";
	# shellcheck disable=SC2034
	purple="\\e[1;35m";
	red="\\e[1;31m";
	violet="\\e[1;35m";
	white="\\e[1;37m";
	yellow="\\e[1;33m";
fi;

# Highlight the user name when logged in as root.
if [[ "${USER}" == "root" ]]; then
	userStyle="${red}";
else
	userStyle="${blue}";
fi;

# Highlight the hostname when connected via SSH.
if [[ "${SSH_TTY}" ]]; then
	hostStyle="${bold}${cyan}";
else
	hostStyle="${cyan}";
fi;

# Set the terminal title to the current working directory.
PS1="\\[\\033]0;\\w\\007\\]";
PS1+="\\[${bold}\\]\\n"; # newline
PS1+="\\[${userStyle}\\]\\u"; # username
PS1+="\\[${white}\\] at ";
PS1+="\\[${hostStyle}\\]${cloud}\\h"; # host
PS1+="\\[${white}\\] in ";
PS1+="\\[${green}\\]\\w"; # working directory
PS1+="\$(prompt_git \"${white} on ${violet}\")"; # Git repository details
PS1+="\$(prompt_kube \"${white} ${violet}\")"; # Kubernetes cluster details
PS1+="\\n";
PS1+="\\[${white}\\]\$ \\[${reset}\\]"; # `$` (and reset color)
export PS1;

PS2="\\[${yellow}\\]→ \\[${reset}\\]";
export PS2;