#! 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="${DARK:-1}"
[ "${TERM}" = "screen.linux" ] && DARK="${DARK:-1}"
[ "${TERM}" = "putty"        ] && DARK="${DARK:-1}"
[ "${TERM}" = "cygwin"       ] && 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 "${COLORFGBG}" ]; then
	BG="$(echo "$COLORFGBG" | sed 's/.*;//')"
	if ! [ "${BG}" -ge 0 ]; then
		if [ "${BG}" = "white" ]; then
			DARK=0
		else
			DARK=1
		fi
	elif [ "${BG}" -ge 0 -a "${BG}" -le 6   -o "${BG}" -eq 8 ]; then
		DARK=1
	else
		DARK=0
	fi
	unset BG
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 $(TERM=xterm dircolors 2> /dev/null)

	if [ -z "$debian_chroot" -a -r /etc/debian_chroot ]; then
		debian_chroot=$(cat /etc/debian_chroot)
	fi
	PS1='${debian_chroot:+($debian_chroot)}'
	PS1="$PS1"'\[\033[00;31m\]\u@\h\[\033[00m\]:\[\033[00;34m\]\w\[\033[00m\]'
	PS1="$PS1"'\[\033[00;36m\]$(__git_ps1 2>/dev/null)\[\033[00m\]'
	PS1="$PS1"'\n\$ '

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

	export LS_COLORS
	export LSCOLORS
fi
unset PS1_COLOR
unset DARK