.bash_prompt

# @gf3's Sexy Bash Prompt, inspired by “Extravagant Zsh Prompt”
# Shamelessly copied from https://github.com/gf3/dotfiles

default_username='matthewmcvickar'

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

if tput setaf 1 &> /dev/null; then
	tput sgr0
	if [[ $(tput colors) -ge 256 ]] 2>/dev/null; then
		MAGENTA=$(tput setaf 9)
		ORANGE=$(tput setaf 172)
		GREEN=$(tput setaf 190)
		PURPLE=$(tput setaf 141)
		WHITE=$(tput setaf 0)
	else
		MAGENTA=$(tput setaf 5)
		ORANGE=$(tput setaf 4)
		GREEN=$(tput setaf 2)
		PURPLE=$(tput setaf 1)
		WHITE=$(tput setaf 7)
	fi
	BOLD=$(tput bold)
	RESET=$(tput sgr0)
else
	MAGENTA="\033[1;31m"
	ORANGE="\033[1;33m"
	GREEN="\033[1;32m"
	PURPLE="\033[1;35m"
	WHITE="\033[1;37m"
	BOLD=""
	RESET="\033[m"
fi

export MAGENTA
export ORANGE
export GREEN
export PURPLE
export WHITE
export BOLD
export RESET

function parse_git_dirty() {
	git diff --quiet --ignore-submodules HEAD 2>/dev/null; [ $? -eq 1 ] && echo '❗'
}

function parse_git_untracked() {
	number_of_untracked_files=$(git status --porcelain 2>/dev/null | grep "^??" | wc -l)
	if [ $number_of_untracked_files != '0' ]; then echo -n ' +' && git status --porcelain 2>/dev/null | grep "^??" | wc -l | awk '{ print $1 }'; fi
}

function parse_git_branch() {
	git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \(.*\)/\1$(parse_git_dirty) ${WHITE}$(parse_git_untracked)/"
}

# Only show username/host if not default.
function usernamehost() {
	if [ $USER != $default_username ]; then echo "${MAGENTA}$USER ${WHITE}at ${ORANGE}$HOSTNAME $WHITEin "; fi
}

# Get the current phase of the moon for use as prompt
# Adapted from: http://wan.pengganas.net/entry/calculating-phase-of-moon-in-ruby
function moonphase() {
/usr/bin/env ruby <<-EORUBY
	# Convert a date to Julian.
	def julian(year, month, day)
	  a = (14-month)/12
	  y = year+4800-a
	  m = (12*a)-3+month

	  return day + (153*m+2)/5 + (365*y) + y/4 - y/100 + y/400 - 32045
	end

	# Define the phases of the moon.
	def phase(year, month, day)
	  p = (julian(year, month, day) - julian(2000, 1, 6)) % 29.530588853

	  if    p < 1.84566 then  return "🌑"  # new
	  elsif p < 5.53699 then  return "🌒"  # waxing crescent
	  elsif p < 9.22831 then  return "🌓"  # first quarter
	  elsif p < 12.91963 then return "🌔"  # waxing gibbous
	  elsif p < 16.61096 then return "🌕"  # full
	  elsif p < 20.30228 then return "🌖"  # waning gibbous
	  elsif p < 23.99361 then return "🌗"  # last quarter
	  elsif p < 27.68493 then return "🌘"  # waning crescent
	  else                    return "🌑"  # new
	  end
	end

	# Get today's phase.
	today = Time.new
	print "#{phase(today.year, today.month, today.day)}"
EORUBY
}

function shellprompt() {
	echo "❯ "
	# echo "$(moonphase)  "
	# Some other options: › » ❯ ➜ ⤇ ➨ ➽ ➞ ➙ → ↳ ➤ ► ▸
}

PS1="\[\e]2;$PWD\[\a\]\[\e]1;\]$(basename "$(dirname "$PWD")")/\W\[\a\]${BOLD}\$(usernamehost)\[$GREEN\]\w\[$WHITE\]\$([[ -n \$(git branch 2> /dev/null) ]] && echo \" on \")\[$PURPLE\]\$(parse_git_branch)\[$WHITE\]\n\$(shellprompt)\[$RESET\]"