#!/bin/sh
#
# Set some variables to make DOS-portable shell scripts possible.
# This script must be sourced by a Bourne-like shell to be effective:
#
#	. portshell
#
# Afterwards, you can use these environment variables:
#
#	UNIX_OR_WIN:	"windows" or "unix".
#	UWIN, ISCYGWIN:	Only one of these can be true (else, false).
#	UNIXY:		true if it's quite unix-like (else, false).
#	DEVNULL,DEVTTY:	Use these instead of /dev/tty etc., for portability.
#	EGREP_SILENT:	The option to use to make egrep silent.
#	TMP:		What to use for /tmp.
#
# Author: Luke Kendall
#
# Copyright (C) Luke Kendall, 2001.  Use however you like.
#
PORTSHELL_VARS="DATE_FMT DEVTTY DEVNULL EGREP_SILENT ISCYGWIN \
    UNIX_OR_WIN UNIXY UWIN TMP"
if [ "x$PORTSHELL" != "xstuff" ]
then
    UNIXY=true	# Well, you're running this shell script, aren't you?
    UWIN=false
    ISCYGWIN=false

    # This used to be -f and -s for U/Win, but not needed in v 2.9 and later.
    #
    DATE_FMT="+"
    EGREP_SILENT="q"

    _uname=`uname`
    case "$_uname" in
	UWIN*)
	    UWIN=true
	    DATE_FMT="-f "	# For old U/Win back compatibility.
	    EGREP_SILENT="s"
	    ;;
	CYGWIN*)
	    ISCYGWIN=true
	    UNIXY=true
	    ;;
	*)
	    # If you discover new shells that can't handle dev tty etc. as
	    # below, then tailor it here.
	    ;;
    esac
    if $UNIXY
    then
	DEVTTY=/dev/tty
	DEVNULL=/dev/null
	TMP=${TMP:-/tmp}
	if [ -s c:/boot.ini ]
	then
	    UNIX_OR_WIN="windows"
	else
	    UNIX_OR_WIN="unix"
	fi
    else
	DEVTTY=con
	DEVNULL=nul
	TMP=${TMP:-$TEMP}
	UNIX_OR_WIN="windows"
	if [ "x$TMP" = "x" ]
	then
	    if [ -d c:/tmp ]
	    then
		TMP=c:/tmp
	    elif [ -d c:/temp ]
	    then
		TMP=c:/temp
	    else
		echo "Couldn't work out what to set TMP to" >&2
	    fi
	fi
    fi

    export $PORTSHELL_VARS
    unset _uname
    PORTSHELL="stuff" export PORTSHELL
fi
if [ "x$1" = "x-v" ]
then
    shift
    for v in $PORTSHELL_VARS
    do
	echo "$v=`eval echo '$'$v`"
    done
fi
unset PORTSHELL_VARS
if [ $# != 0 ]
then
    echo "usage: . portshell [-v]" >&2
fi