#! bash

# This file is responsible for setting up the pretty colours in GNU 'ls' and
# the bash prompt. Depending on whether you use a light on dark, or dark on
# light terminal you want different colour schemes. Rxvt and some other
# set the COLORFGBG environment variable to make autodetecting this easy.

# These scripts attempt to detect the terminal colours, and then set COLORFGBG
# if it isn't already set so that programs like vim can set the correct colours.

# If your terminal isn't detected correctly then you can run lightterm or
# darkterm to get the colours right. The default can be adjusted below.

# Set to 0 for light background terminal colours by default
# Set to 1 for dark background terminal colours by default
DEFAULTDARK=1


# Terminals that we want coloured prompts in
[ -n "${COLORTERM}"      ] && PS1_COLOR=1
[ "${TERM}" = "linux"    ] && DARK="${DARK:-1}"
[ "$(tput colors)" -gt 2 ] && PS1_COLOR=1

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

# 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 "${COLORFGBG}" ]; then
	FGBG="$(echo $COLORFGBG | sed 's/;.*;/;/')" # Allow for rxvt without xpm
	FG=$(echo "${FGBG}" | cut -d ';' -f 1)
	BG=$(echo "${FGBG}" | cut -d ';' -f 2)
	if [ "${FG}" = "white" -o "${FG}" = "green" ]; then
		DARK=1
	elif [ "${BG}" = "black" ]; then
		DARK=1
	elif [ "${FG}" = "black" ]; then
		DARK=0
	elif [ "${BG}" = "white" ]; then
		DARK=0
	elif [ "${FG}" -gt "${BG}" ]; then
		DARK=1
	elif [ "${FG}" -lt "${BG}" ]; then
		DARK=0
	fi
	unset FG
	unset BG
	unset FGBG
else
	# Otherwise we just do our best based on the setting of DARK
	if [ ${DARK} -eq 0 ]; then
		export COLORFGBG="0;15"
	else
		export COLORFGBG="15;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 $(dircolors 2> /dev/null)
	PS1='${debian_chroot:+($debian_chroot)}\[\033[00;31m\]\u@\h\[\033[00m\]:\[\033[00;34m\]\w\[\033[00m\]\$ '

	if [ ${DARK} -eq 0 ]; then
		LS_COLORS="$(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
fi
unset PS1_COLOR
unset DARK