#!/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.
	git rev-parse --is-inside-work-tree &>/dev/null || return;

	# Check for what branch we’re on.
	# Get the short symbolic ref. If HEAD isn’t a symbolic ref, get a
	# tracking remote branch or tag. Otherwise, get the
	# short SHA for the latest commit, or give up.
	branchName="$(git symbolic-ref --quiet --short HEAD 2> /dev/null || \
		git describe --all --exact-match HEAD 2> /dev/null || \
		git rev-parse --short HEAD 2> /dev/null || \
		echo '(unknown)')";

	# Early exit for Chromium & Blink repo, as the dirty check takes too long.
	# Thanks, @paulirish!
	# https://github.com/paulirish/dotfiles/blob/dd33151f/.bash_prompt#L110-L123
	repoUrl="$(git config --get remote.origin.url)";
	if grep -q 'chromium/src.git' <<< "${repoUrl}"; then
		s+='*';
	else
		# 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;

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

	echo -e "${1}${branchName}${2}${s}";
}

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;

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

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