dotfiles/includes/bash_prompt.bash

# Inspired by: https://github.com/dreadatour/dotfiles/blob/master/.bash_profile

# Setup color variables
color_is_on=
color_red=
color_green=
color_yellow=
color_blue=
color_white=
color_gray=
color_bg_red=
color_off=
if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
	color_is_on=true
	color_red="\[$(/usr/bin/tput setaf 1)\]"
	color_green="\[$(/usr/bin/tput setaf 2)\]"
	color_yellow="\[$(/usr/bin/tput setaf 3)\]"
	color_blue="\[$(/usr/bin/tput setaf 6)\]"
	color_white="\[$(/usr/bin/tput setaf 7)\]"
	color_gray="\[$(/usr/bin/tput setaf 8)\]"
	color_off="\[$(/usr/bin/tput sgr0)\]"
	color_error="$(/usr/bin/tput setab 1)$(/usr/bin/tput setaf 7)"
	color_error_off="$(/usr/bin/tput sgr0)"

	# Set user color
	case `id -u` in
		0) color_user=$color_red ;;
		*) color_user=$color_green ;;
	esac
fi

# Some kind of optimization - check if git installed only on config load
PS1_GIT_BIN=$(which git 2>/dev/null)

function prompt_command {
	local PS1_GIT=
	local GIT_BRANCH=
	local GIT_DIRTY=
	local PWDNAME="$PWD"

	# Beautify working directory name
	if [ "$HOME" == "$PWD" ]; then
		PWDNAME="~"
	elif [ "$HOME" == "${PWD:0:${#HOME}}" ]; then
		PWDNAME="~${PWD:${#HOME}}"
	fi

	# Parse git status and get git variables
	if [[ ! -z "$PS1_GIT_BIN" ]]; then
		# Check if we are in git repo
		local CUR_DIR="$PWD"
		while [[ ! -d "${CUR_DIR}/.git" ]] && [[ ! "${CUR_DIR}" == "/" ]] && [[ ! "${CUR_DIR}" == "~" ]] && [[ ! "${CUR_DIR}" == "" ]]; do CUR_DIR="${CUR_DIR%/*}"; done
		if [[ -d "${CUR_DIR}/.git" ]]; then
			# Get git branch
			GIT_BRANCH="$($PS1_GIT_BIN symbolic-ref HEAD 2>/dev/null)"
			if [[ ! -z "$GIT_BRANCH" ]]; then
				GIT_BRANCH="${GIT_BRANCH#refs/heads/}"

				# Get git status
				local GIT_STATUS="$($PS1_GIT_BIN status --porcelain 2>/dev/null)"
				[[ -n "$GIT_STATUS" ]] && GIT_DIRTY=1
			fi
		fi
	fi

	# Build B&W prompt for git
	[[ ! -z "$GIT_BRANCH" ]] && PS1_GIT=" #${GIT_BRANCH}"

	# Calculate prompt length
	local PS1_length=$((${#USER}+${#HOSTNAME}+${#PWDNAME}+${#PS1_GIT}+3))
	local FILL=

	# If length is greater, than terminal width
	if [[ $PS1_length -gt $COLUMNS ]]; then
		# Strip working directory name
		PWDNAME="...${PWDNAME:$(($PS1_length-$COLUMNS+3))}"
	else
		# Else calculate fillsize
		local fillsize=$(($COLUMNS-$PS1_length))
		FILL="$color_gray"
		while [[ $fillsize -gt 0 ]]; do FILL="${FILL}─"; fillsize=$(($fillsize-1)); done
		FILL="${FILL}${color_off}"
	fi

	if $color_is_on; then
		# Git status for prompt
		if [ ! -z "$GIT_BRANCH" ]; then
			if [ -z "$GIT_DIRTY" ]; then
				PS1_GIT=" #${color_green}${GIT_BRANCH}${color_off}"
			else
				PS1_GIT=" #${color_red}${GIT_BRANCH}${color_off}"
			fi
		fi
	fi

	# Set new color prompt
	PS1="${color_user}${USER}${color_off}@${color_yellow}${HOSTNAME}${color_off}:${color_white}${PWDNAME}${color_off}${PS1_GIT} ${FILL}\n→ "

	# Get cursor position and add new line if we're not in first column
	echo -en "\033[6n" && read -sdR CURPOS
	[[ "${CURPOS##*;}" -gt 1 ]] && echo "${color_error}●${color_error_off}"

	# Terminal title
	TITLE=`basename ${PWDNAME}`
	[ $SHLVL -gt 1 ] && TITLE="${TITLE} — ${HOSTNAME}"
	echo -ne "\033]0;${TITLE}"; echo -ne "\007"
}

# Set prompt command (title update and color prompt)
PROMPT_COMMAND=prompt_command
# Set new B&W prompt (will be overwritten in `prompt_command` later with color prompt)
PS1='\u@\h:\w\$ '