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#!/bin/sh
#
#    shutil: some shared utilities used by all status scripts
#
#    Copyright (C) 2011-2014 Dustin Kirkland
#
#    Authors: Dustin Kirkland <kirkland@byobu.org>
#             Scott Moser <smoser@ubuntu.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, version 3 of the License.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Define colors
color_screen() {
	ESC="\005"
	case "$1" in
		"") return 0 ;;
		-)   printf "$ESC{-}" ;;
		--)   printf "$ESC{-} " ;;
		esc)    printf "$ESC" ;;
		bold1)  printf "$ESC{=b }" || printf "$ESC{= }" ;;
		bold2)  printf "$ESC{+b }" || printf "$ESC{= }" ;;
		none)   printf "$ESC{= }" ;;
		invert) printf "$ESC{=r }" ;;
		*)
			local attr fg bg
			case $# in
				2)
					attr= ; fg=$1 ; bg=$2
				;;
				3)
					attr=$1 ; fg=$2 ; bg=$3
				;;
			esac
			if [ "$MONOCHROME" = "1" ]; then
				fg=
				bg=
			fi
			printf "$ESC{=$attr $fg$bg}"
		;;
	esac
}

color_map() {
	case "$1" in
		"k") _RET="black" ;;
		"r") _RET="red" ;;
		"g") _RET="green" ;;
		"y") _RET="yellow" ;;
		"b") _RET="blue" ;;
		"m") _RET="magenta" ;;
		"c") _RET="cyan" ;;
		"w") _RET="white" ;;
		"d") _RET="black" ;;
		"K") _RET="brightblack" ;;
		"R") _RET="brightred" ;;
		"G") _RET="brightgreen" ;;
		"Y") _RET="brightyellow" ;;
		"B") _RET="brightblue" ;;
		"M") _RET="brightmagenta" ;;
		"C") _RET="brightcyan" ;;
		"W") _RET="brightwhite" ;;
		*) _RET="$1" ;;
	esac
}

attr_map() {
	case "$1" in
		"d") _RET=,dim ;;
		"u") _RET=,underscore ;;
		"b") _RET=,bold ;;
		"r") _RET=,reverse ;;
		"s") _RET=,standout ;;
		"B") _RET=,blinking ;;
		"h") _RET=,hidden ;;
		"i") _RET=,italics ;;
		*) _RET= ;;
	esac
}

color_tmux() {
	local back fore attr
	case "$1" in
		"") return 0 ;;
		-)      printf "#[default]#[fg=$BYOBU_LIGHT,bg=$BYOBU_DARK]" ;;
		--)     printf "#[default]#[fg=$BYOBU_LIGHT]#[bg=$BYOBU_DARK] " ;;
		esc)    printf "" ;;
		bold*)  printf "#[default]#[fg=bold]" ;;
		none)   printf "#[default]#[fg=$BYOBU_LIGHT,bg=$BYOBU_DARK]" ;;
		invert) printf "#[default]#[reverse]" ;;
		*)
			if [ "$#" = "2" ]; then
				color_map "$1"; back="$_RET"
				color_map "$2"; fore="$_RET"
			else
				attr_map "$1";  attr="$_RET"
				color_map "$2"; back="$_RET"
				color_map "$3"; fore="$_RET"
			fi
			[ "$MONOCHROME" = "1" ] && printf "#[default]" || printf "#[default]#[fg=$fore$attr,bg=$back]"
		;;
	esac
}

color() {
	case "$BYOBU_BACKEND" in
		tmux)
			color_tmux "$@"
		;;
		screen)
			color_screen "$@"
		;;
	esac
}

# uncommented_lines(char=#)
# does the standard input have lines that do not start with 'char'?
uncommented_lines() {
	local line chr="${1:-#}"
	while read line; do
		[ "${line#${chr}}" = "${line}" ] && return 0;
	done
	return 1
}

# newest(file,file,file..)
# return the newest file in the list
newest() {
	local c="$1" i
	for i in "$@"; do [ "$i" -nt "$c" ] && c="$i"; done
	[ -e "$c" ] && _RET="$c"
}

error() {
	printf "%s\n" "ERROR: " "$@" 1>&2
}

fail() {
	[ $# -eq 0 ] || error "$@"; exit 1;
}

find_script() {
	# Allow for local status scripts
	if [ -x "$BYOBU_CONFIG_DIR/bin/$1" ]; then
		_RET="$BYOBU_CONFIG_DIR/bin/$1"
	elif [ -x "$BYOBU_PREFIX/lib/$PKG/$1" ]; then
		_RET="$BYOBU_PREFIX/lib/$PKG/$1"
	elif [ -x "$BYOBU_PREFIX/libexec/$PKG/$1" ]; then
		_RET="$BYOBU_PREFIX/libexec/$PKG/$1"
	else
		_RET="/dev/null"
	fi
}

# divide 2 integers and return a floating point number
# third argument indicates how many digits after the decimal
fpdiv() {
	local a=$1 b=$2 pres=${3:-3}
	local i=0 mp="10" whole="" part="" chunk="" n=0
	while i=$(($i+1)) && [ $i -le $pres ]; do
		mp="${mp}0"
		chunk="${chunk}?"
	done

	n=$(((${mp}*${a})/${b}))

	# round up if necessary
	[ $((($n-5)/10)) = $(($n/10)) ] && n=$(($n+5))

	# drop the last digit, which was only there for rounding
	n=${n%?}
	whole=${n%${chunk}}
	part=${n#${whole}}
	_RET=${whole:-0}${part:+.${part}}
	return
}

# rtrim(string,chars)
rtrim() {
	local tab=' ' cr="
"
	local cur="${1}" set="[${2:- ${tab}${cr}}]" n=""
	while n=${cur%${set}} && [ "$n" != "$cur" ]; do cur=${n}; done
	_RET=${cur}
}

readfile() {
	local c="" r="" cr="
"
	OIFS="$IFS"; IFS="";
	while read c; do
		r="$r${cr}$c"
	done
	IFS=$OIFS
	_RET=${r}
	return 0
}

metadata_available() {
	# This is really ugly.  We need a reliable, fast way of determining
	# if a metadata service is available, that does NOT slow down non-ec2
	# machines.
	local x=0 cache="$BYOBU_CONFIG_DIR/.metadata_available"
	# First, check the cache
	if [ -s "$cache" ]; then
		# Metadata is non-empty, so we have metadata available
		x=1
	else
		# Must seed the cache
		if [ -e /etc/ec2_version ] || [ -e /usr/sbin/update-grub-legacy-ec2 ]; then
			# This *looks* like a machine with metadata, so background a potentially slow check
			timeout 1 wget -q -O- --tries=1 http://169.254.169.254 </dev/null >"$cache" 2>/dev/null &
			sleep 0.02
			[ -s "$cache" ] && x=1
		fi
	fi
	[ "$x" = "1" ]
}

status_freq() {
# Define status frequencies
#   Use prime number intervals, to decrease collisions, which
#   yields some less expensive status updates.
#   ~86000 ~1 day
#   ~600   ~10 minutes
#   ~180   ~3 minutes
#   ~60    ~1 minute
	case "$1" in
		apport)		_RET=67 ;;
		arch)		_RET=9999991 ;;
		battery)	_RET=61 ;;
		color)		_RET=9999991 ;;
		cpu_count)	_RET=5 ;;
		cpu_freq)	_RET=2 ;;
		cpu_temp)	_RET=19 ;;
		custom)		_RET=5 ;;
		date)		_RET=9999991 ;;
		disk)		_RET=13 ;;
		disk_io)	_RET=3 ;;
		distro)		_RET=9999991 ;;
		entropy)	_RET=5 ;;
		fan_speed)	_RET=23 ;;
		hostname)	_RET=607 ;;
		ip_address)	_RET=127 ;;
		load_average)	_RET=2 ;;
		logo)		_RET=9999991 ;;
		mail)		_RET=5 ;;
		memory)		_RET=13 ;;
		menu)		_RET=9999991 ;;
		network)	_RET=3 ;;
		notify_osd)	_RET=9999991 ;;
		processes)	_RET=7 ;;
		raid)		_RET=59 ;;
		reboot_required) _RET=5 ;;
		release)	_RET=599 ;;
		services)	_RET=53 ;;
		session)	_RET=9999991 ;;
		swap)		_RET=19 ;;
		time)		_RET=9999991 ;;
		time_binary)	_RET=23 ;;
		time_utc)	_RET=11 ;;
		trash)		_RET=9999991 ;;
		updates_available) _RET=7 ;;
		uptime)		_RET=29 ;;
		users)		_RET=11 ;;
		whoami)		_RET=86029 ;;
		wifi_quality)	_RET=17 ;;
		*)		_RET=9999991 ;;
	esac
}

get_now() {
	if [ -r /proc/uptime ]; then
		# return the integer part of the first item in /proc/uptime
		local s c
		read s c < /proc/uptime
		_RET=${s%.*}
	else
		_RET=$(date +%s);
	fi
}

get_network_interface() {
        if [ -n "$MONITORED_NETWORK" ]; then
		# Manual override
                _RET="$MONITORED_NETWORK"
        elif [ -e /proc/net/route ]; then
		# Linux systems, read route and interface from procfs
		local Iface Destination Gateway Flags RefCnt Use Metric Mask MTU Window IRTT
		while read Iface Destination Gateway Flags RefCnt Use Metric Mask MTU Window IRTT; do
			[ "$Mask" = "00000000" ] && break
		done < /proc/net/route
		_RET="$Iface"
	elif eval $BYOBU_TEST route >/dev/null 2>&1; then
		# Route command on path
		_RET=$(route get default|grep interface:|awk '{print $2}')
	elif [ -x "/sbin/route" ]; then
		# Mac OSX, shell out to the route command
		_RET=$(/sbin/route get default|grep interface:|awk '{print $2}')
	fi
}

get_distro() {
	local distro="${DISTRO}"
	if [ -n "$DISTRO" ]; then
		# user defined
		true
	elif [ -r "/etc/os-release" ]; then
		distro=$(. /etc/os-release && echo "$NAME")
		case "$distro" in
			Debian*)
				[ -r /etc/lsb-release ] && distro=$(. /etc/lsb-release && [ -n "$GOOGLE_ID" ] && echo "gLinux" || echo "Debian")
			;;
		esac
	elif [ -r "/etc/issue" ]; then
		# lsb_release is *really* slow;  try to use /etc/issue first
		local issue
		IFS="" read issue < /etc/issue
		case "$issue" in
			Ubuntu*)
				distro="Ubuntu";
			;;
			Debian*)
				distro="Debian"
			;;
			Red\ Hat\ Enterprise*)
				distro="RHEL"
			;;
			*)
				# assume first field is what we want
				distro="${issue%% *}";
			;;
		esac
	elif eval $BYOBU_TEST lsb_release >/dev/null 2>&1; then
		# If lsb_release is available, use it
		local r=$(lsb_release -s -d)
		case "$r" in
			Ubuntu*)
				# Use the -d if an Ubuntu LTS
				distro="Ubuntu"
			;;
			*)
				# But for other distros the description
				# is too long, so build from -i and -r
				distro=$(lsb_release -s -i)
			;;
		esac
	elif eval $BYOBU_TEST sw_vers >/dev/null 2>&1; then
		distro="$(sw_vers -productName)"
	elif eval $BYOBU_TEST uname >/dev/null 2>&1; then
		distro="$(uname -s)"
	else
		distro="Byobu"
	fi
	_RET="$distro"
}

# vi: syntax=sh ts=4 noexpandtab