pureish.bash

#
# Cool bash prompt
# Modified verison of a dotfile by Artem Sapegin, sapegin.me
# ...which was originally inspired by: https://github.com/sindresorhus/pure
#
# You'll want to add the following to your bashrc to make this work properly:
#
# RED="$(tput setaf 1)"
# GREEN="$(tput setaf 2)"
# YELLOW="$(tput setaf 3)"
# BLUE="$(tput setaf 4)"
# MAGENTA="$(tput setaf 5)"
# CYAN="$(tput setaf 6)"
# WHITE="$(tput setaf 7)"
# GRAY="$(tput setaf 8)"
# BOLD="$(tput bold)"
# UNDERLINE="$(tput sgr 0 1)"
# INVERT="$(tput sgr 1 0)"
# NOCOLOR="$(tput sgr0)"
# local_username=$USER
#

# User color
case $(id -u) in
	0) user_color="\[$RED\]" ;;  # root
	*) user_color="\[$GREEN\]" ;;
esac

# Symbols
prompt_symbol="ÔØ»"
prompt_venv_symbol="Ôÿé "

function prompt_command() {
	# Local or SSH session?
	local remote=
	[ -n "$SSH_CLIENT" ] || [ -n "$SSH_TTY" ] && remote=1

	# Git branch name and work tree status (only when we are inside Git working tree)
	local git_prompt=
	if [[ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]]; then
		# Branch name
		local branch="$(git symbolic-ref HEAD 2>/dev/null)"
		branch="${branch##refs/heads/}"

		# Working tree status (red when dirty)
		local dirty=
		# Modified files
		git diff --no-ext-diff --quiet --exit-code --ignore-submodules 2>/dev/null || dirty=1
		# Untracked files
		[ -z "$dirty" ] && test -n "$(git status --porcelain)" && dirty=1

		# Format Git info
		if [ -n "$dirty" ]; then
			git_prompt=" \[$RED\]$branch\[$NOCOLOR\]"
		else
			git_prompt=" \[$GREEN\]$branch\[$NOCOLOR\]"
		fi
	fi

	# Virtualenv
	local venv_prompt=
	if [ -n "$VIRTUAL_ENV" ]; then
	    venv_prompt="\[$BLUE\]$prompt_venv_symbol$(basename $VIRTUAL_ENV)\[$NOCOLOR\]"
	fi

	# Only show username if not default
	local user_prompt=
	[ "$USER" != "$local_username" ] && user_prompt="$user_color$USER\[$NOCOLOR\] "

	# Show hostname inside SSH session
	local host_prompt=
	[ -n "$remote" ] && host_prompt="@\[$YELLOW\]$HOSTNAME\[$NOCOLOR\]"

	# Format prompt
	first_line=
	[ -n "$user_prompt" ] || [ -n "$host_prompt" ] || [ -n "$venv_prompt" ] && first_line="$user_prompt$host_prompt\[$NOCOLOR\]$venv_prompt\n"
	# Text (commands) inside \[...\] does not impact line length calculation which fixes stange bug when looking through the history
	# $? is a status of last command, should be processed every time prompt prints
	second_line="\W$git_prompt \`if [ \$? = 0 ]; then echo \[\$CYAN\]; else echo \[\$RED\]; fi\`\[\$prompt_symbol\]\[\$NOCOLOR\] "
	PS1="\n$first_line$second_line"

	# Multiline command
	PS2="\[$CYAN\]$prompt_symbol\[$NOCOLOR\] "

	# Terminal title
	local title="$(basename "$PWD")"
	[ -n "$remote" ] && title="$title \xE2\x80\x94 $HOSTNAME"
	echo -ne "\033]0;$title"; echo -ne "\007"
}

# Show awesome prompt only if Git is istalled
command -v git >/dev/null 2>&1 && PROMPT_COMMAND=prompt_command