bash_prompt

#!/usr/bin/env 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.

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

prompt_git() {
	local s='';
	local branchName='';

	# 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

			# Ensure the index is up to date.
			git update-index --really-refresh -q &>/dev/null;

			# 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)')";

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

		echo -e "${1}${branchName}${2}${s}";
	else
		return;
	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";
	black="\e[1;30m";
	blue="\e[1;34m";
	cyan="\e[1;36m";
	green="\e[1;32m";
	orange="\e[1;33m";
	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="${orange}";
fi;

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

# add the host hostname if present (e.g., docker)
if [[ "${HOST_HOSTNAME}" ]]; then
	hh1="${HOST_HOSTNAME}";
	hh2=" → ";
else
	hh1="";
	hh2="";
fi;

# Set the terminal title and prompt.
PS1="\[\033]0;\W\007\]"; # working directory base name
PS1+="\[${bold}\]\n"; # newline
PS1+="\[${purple}\]\$hh1\[${white}\]\$hh2"; # host hostname
PS1+="\[${userStyle}\]\u"; # username
PS1+="\[${white}\]@";
PS1+="\[${hostStyle}\]\h"; # host
#PS1+="\[${hostStyle}\]\$CONDA_DEFAULT_ENV ";
#PS1+="\[${white}\] in ";
PS1+=" \[${green}\]\w"; # working directory
PS1+="\$(prompt_git \"${white} on ${violet}\")"; # Git repository details
#PS1+="\$(prompt_git \"\[${white}\] on \[${violet}\]\" \"\[${blue}\]\")"; # Git repository details
PS1+="\n";
PS1+="\[${white}\](\j)\$ \[${reset}\]"; # `$` (and reset color)
export PS1;

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

# XXX older alternative
# # local color vars
# c_reset='\e[0m'
# c_red='\e[0;31m'
# c_green='\e[0;32m'
# c_brown='\e[0;33m'
# 
# 
# # bash function to extract git branch name
# function parse_git_branch ()
# {
#   if git rev-parse --git-dir >/dev/null 2>&1; then
#     gitver=$(git branch 2>/dev/null| sed -n '/^\*/s/^\* //p')
#     # add short hash of current commit
#     gitver=$gitver-$(git rev-parse --short HEAD)
#     # add colors depending on status
#     if git diff --quiet 2>/dev/null >&2; then
#       gitver="($c_green$gitver$c_reset)"
#     else
#       gitver="($c_red$gitver$c_reset)"
#     fi
#   else
#     return 0
#   fi &> /dev/null
#   echo -e $gitver
# }
# 
# function prompt_infos ()
# {
#     echo -e "------------------------------------------------------\n[\h][$c_brown\$CONDA_DEFAULT_ENV-\$INQUIDEO_VERSION$c_reset][\w]\$(parse_git_branch)\n......................................................\n(\j)[\!]$ "
# }
# 
# export PS1="\033]2;[\h]\w\007$(prompt_infos)"