#! bash

# This file is responsible for setting up the pretty colours in GNU 'ls' and
# the bash prompt. It also sets COLORFGBG to give programs like vim an idea
# of the terminal colours to use. If your terminal isn't detected correctly
# then you can run lightterm or darkterm to get the colours right. To do this
# automatically try changing the table below.

# Terminals that we want coloured prompts in
[ -n "${COLORTERM}"           ] && PS1_COLOR=1
[ "${TERM}" = "linux"         ] && PS1_COLOR=1 && DARK=1
[ "${TERM}" = "screen"        ] && PS1_COLOR=1
[ "${TERM}" = "xterm"         ] && PS1_COLOR=1
[ "${TERM}" = "xterm-color"   ] && PS1_COLOR=1
[ "${TERM}" = "rxvt"          ] && PS1_COLOR=1
[ "${TERM}" = "rxvt-unicode"  ] && PS1_COLOR=1

# Override COLORFGBG (probably used the darkterm or lightterm function
if [ -n "${DARK}" ]; then
	unset COLORFGBG
fi

# If COLORFGBG is set, use it to determine the terminal type, DARK=0 is
# dark on light, DARK=1 is light on dark.
if [ -n "${COLORFGBG}" ]; then
	FGCOLOR=$(echo "${COLORFGBG}" | cut -d ';' -f 1)
	BGCOLOR=$(echo "${COLORFGBG}" | cut -d ';' -f 3)
	if [ "${FGCOLOR}" -gt "${BGCOLOR}" ]; then
		DARK=1
	fi
	unset FGCOLOR
	unset BGCOLOR
else
# Otherwise we just do our best based on the setting of DARK, defaulting to
# light on dark, change the :-0 here to :-1 to change the default.
	if [ ${DARK:-0} -eq 0 ]; then
		export COLORFGBG="0;default;15"
	else
		export COLORFGBG="15;default;0"
	fi
fi

# Set the prompt colour, and the colors for the 'ls' command appropriately,
# depending on the background of the terminal.
if [ ${PS1_COLOR:-0} -eq 1 ]; then
	eval $(dircolors 2> /dev/null)
	PS1='\[\033[00;31m\]\u@\h\[\033[00m\]:\[\033[00;34m\]\w\[\033[00m\]\$ '

	if [ ${DARK:-0} -eq 0 ]; then
		LS_COLORS="$(echo "${LS_COLORS}" | sed 's/01;/00;/g')"
	else
		# We need to bold the LS_COLORS and PS1 environment variables
		# so they show up on a dark terminal
		LS_COLORS="$(echo "${LS_COLORS}" | sed 's/00;/01;/g')"
		PS1="$(echo "${PS1}" | sed 's/00;/01;/g')"
	fi

	export LS_COLORS
	unset PS1_COLOR
	unset DARK
fi