#!/bin/sh

# This is a UNIX shell script that generates a custom "Makefile" file and
# a "config.h" file.
#
# usage: configure [[flags] system]
#
# flags: --with-x[=no]		enable/disable support for X-windows interface
#	 --without-x		disable support for X-windows interface
#	 --with-gcc[=no]	enable/disable use of GCC
#	 --without-gcc		disable use of GCC
#	 --x-includes=DIR	add DIR to path for X-windows include files
#	 --x-libraries=DIR	add DIR to path for X-windows libraries
#        --libs=STRING		define the non-X11 part of the LIBS= line
#	 --bindir=DIR		where to install the executables
#	 --datadir=DIR		where to install the supporting data files
#	 --ioctl=VARIETY	type of tty ioctl to use: termios, termio, sgtty
#
# system: *one* of the following...
#	 linux			UNIX clone for IBM clones
#	 sunos			Sun's Ancient SunOS variant of BSD
#	 solaris		Sun's OLDER Solaris systems
#	 solaris2		Sun's NEWER Solaris 2 systems
#	 aix			IBM's variant of POSIX
#	 osf-1			DEC's variant of POSIX
#	 ultrix			DEC's variant of BSD
#	 hp-ux			HP's variant of POSIX
#	 qnx			QNX's POSIXish real-time operating system
#	 irix			SGI's variant of POSIX
#	 xenix			ancient SCO Xenix-386 systems
#	 sco			SCO UNIX or Open Desktop systems
#	 bsd			typical BSD implementations
#	 freebsd		freebsd is a specific BSD implementation
#	 posix			generic POSIX implementations
#        (anything else)	generic UNIX, including SysV
# If no system is specified, this script will attempt to obtain the system
# type by running the "uname" command.  If it can't recognize the system name
# returned by "uname", then it uses generic UNIX settings.  The script also
# inspects the files on your system to refine those settings, so it'll still
# work okay, usually.

# Set some defaults
XINCPATH="/usr/include /usr/include/X11 /usr/X11/include /usr/local/X11/include /usr/openwin/include /usr/X11R6/include"
XLIBPATH="/lib /usr/lib /usr/X11/lib /usr/local/X11/lib /usr/openwin/lib /usr/X11R6/lib "`echo "$LD_LIBRARY_PATH" | tr ':' ' '`
GNUPATH=`echo "$PATH" | tr ':' ' '`
BINDIR=/usr/local/bin
LIBDIR=/usr/local/lib/elvis
SYS=`uname | tr '[A-Z]' '[a-z]'`
DEFAULT_CC="cc -O"
IOCTL=""

# Initialize some variables.  These aren't merely defaults; don't change them!
args=""
XLIBS=""

# Solaris 2 masquerades as SunOS.  Check for that, by examining the
# release number.
if [ "$SYS" = sunos ]
then
	case `uname -r` in
	  [5-9]*)	SYS=solaris2	;;
	esac
fi

# Ultrix has a broken /bin/sh; it doesn't support shell functions.  Try to be
# clever about running bash instead of /bin/sh there.
if [ "$SYS" = ultrix ]
then
	case "$0" in
	  *configure)
		(echo set - "$@"; cat configure) | bash
		exit 0
		;;
	esac
fi

# This function is used to look for a file in a path. $1 is the name of the
# file, and the remaining args are the path.  It write the absolute file file
# to stdout if successful
searchpath()
{
	file=$1
	shift
	for i
	do
		if [ -f $i/$file ]
		then
			echo $i/$file
			return
		fi
	done
}

# This function outputs a usage message, and then exits
usage()
{
	echo "usage: configure [[flags] system]"
	echo "flags: --with-x[=no]      enable/disable support for X-windows interface"
	echo "       --without-x        disable support for X-windows interface"
	echo "       --with-gcc[=no]    enable/disable use of GCC"
	echo "       --without-gcc      disable use of GCC"
	echo "       --x-includes=DIR   add DIR to path for X-windows include files"
	echo "       --x-libraries=DIR  add DIR to path for X-windows libraries"
	echo "       --bindir=DIR       where to install the executables"
	echo "       --datadir=DIR      where to install the supporting data files"
	echo "       --libs=STRING      non-X11 part of the LIBS= string in Makefile"
	echo "       --ioctl=VARIETY    type of tty ioctl to use: termios, termio, or sgtty"
	echo "system: linux, sunos, solaris, solaris2, freebsd, bsd, posix, aix, osf-1,"
	echo "        ultrix, hp-ux, qnx, irix, xenix, sco (meaning SCO Unix or Open Desktop)"
	if [ "$*" ]
	then
		echo "$*"
	fi
	exit
}

# Check the arguments
for i
do
	case "$i" in
	  --with-x=no|--without-x)
		GUI_X11=undef
		args="$args --with-x=no"
		;;
	  --with-x*)
		GUI_X11=define
		args="$args --with-x"
		;;
	  --with-gcc=no|--without-gcc)
		gnu=n
		args="$args --with-gcc=no"
		;;
	  --with-gcc*)
		gnu=y
		args="$args --with-gcc"
		;;
	  --x-includes=*)
		XINCPATH=`echo "$i"|sed 's/^--x-includes=//'`" $XINCPATH"
		args="$args $i"
		;;
	  --x-libraries=*)
		XLIBPATH=`echo "$i"|sed 's/^--x-libraries=//'`" $XLIBPATH"
		args="$args $i"
		;;
	  --bindir=*)
		BINDIR=`echo "$i"|sed 's/^--bindir=//'`
		args="$args $i"
		;;
	  --datadir=*)
		LIBDIR=`echo "$i"|sed 's/^--datadir=//'`
		args="$args $i"
		;;
	  --libs=*)
		LIBS=`echo "$i"|sed 's/^--libs=//'`
		# added to args later
		;;
	  --ioctl=termios|--ioctl=termio|--ioctl=sgtty)
		IOCTL=`echo "$i"|sed 's/^--ioctl=//'`
		args="$args $i"
		;;
	  --ioctl=*)
		usage "bad --ioctl value; must be termios, termio, or sgtty"
		;;
	  --help|-\?)
		usage
		;;
	  --*)
		# Ignore other --symbol flags
		;;
	  -*)
		usage invalid option $i
		;;
	  *)
		SYS="$i"
		;;
	esac
done

# Try to locate some files
inet=`searchpath netinet/in.h $XINCPATH`
xinc=`searchpath X11/Xresource.h $XINCPATH`
xlib=`searchpath libX11.a $XLIBPATH`
if [ "$xlib" = "" ]
then
	xlib = `searchpath libX11.so.* $XLIBPATH`
fi
case "$CC" in
  "")	CC="$DEFAULT_CC"
	case "$gnu" in
	  y|"")	gnu=`searchpath gcc $GNUPATH`
		;;
	esac
	;;
esac
case "$gnu" in
 y|n)	gnu="" ;;
esac

# If X-windows is unspecified, and the X files are present, then assume with-x
if [ "$GUI_X11" = "" -a "$xinc" ]
then
	GUI_X11=define
	args="$args --with-x"
elif [ "$GUI_X11" = "" ]
then
	GUI_X11=undef
	args="$args --with-x=no"
fi

# if network protocols are unspecified, and the network header files are
# present, then assume they should be used.
if [ "$PROTOCOL_HTTP" = "" -a "$inet" ]
then
	PROTOCOL_HTTP=define
elif [ "$PROTOCOL_HTTP" = "" ]
then
	PROTOCOL_HTTP=undef
fi
if [ "$PROTOCOL_FTP" = "" -a "$inet" ]
then
	PROTOCOL_FTP=define
elif [ "$PROTOCOL_FTP" = "" ]
then
	PROTOCOL_FTP=undef
fi

################################################################################


# Check for some known system quirks
if [ -f /usr/include/sys/ptem.h ]
then
	NEED_WINSIZE=define
fi
if [ -f /usr/include/termcap.h ]
then
	NEED_SPEED_T=define
fi
if [ -f /usr/include/sys/wait.h ]
then
	NEED_WAIT_H=define
fi
if [ -f /usr/include/sys/select.h ]
then
	NEED_SELECT_H=define
fi
if [ -f /usr/include/sys/ioctl.h ]
then
	NEED_IOCTL_H=define
fi
if [ -f /usr/include/netinet/in.h ]
then
	NEED_IN_H=define
fi
if [ -f /usr/include/sys/socket.h ]
then
	NEED_SOCKET_H=define
fi
if [ X"$xinc" != X ]
then
	if [ -f `dirname $xinc`/Xos.h ]
	then
		NEED_XOS_H=define
	fi
fi
if fgrep setpgid /usr/include/unistd.h >/dev/null 2>/dev/null
then
	NEED_SETPGID=undef
else
	NEED_SETPGID=define
fi
if fgrep XrmCombineFileDatabase $xinc </dev/null >/dev/null
then
	NEED_XRMCOMBINEFILEDATABASE=undef
else
	NEED_XRMCOMBINEFILEDATABASE=define
fi
if fgrep inet_aton /usr/include/arpa/inet.h </dev/null >/dev/null
then
	NEED_INET_ATON=undef
else
	NEED_INET_ATON=define
fi
if fgrep memmove /usr/include/string*.h </dev/null >/dev/null
then
	NEED_MEMMOVE=undef
else
	NEED_MEMMOVE=define
fi
case "$IOCTL" in
  termios)	USE=			;;
  termio)	USE=" -DUSE_TERMIO"	;;
  sgtty)	USE=" -DUSE_SGTTY"	;;
  *)
	if [ -f /usr/include/termios.h ]
	then
		USE=
		args="$args --ioctl=termios"
	else
		if [ -f /usr/include/termio.h ]
		then
			USE=" -DUSE_TERMIO"
			args="$args --ioctl=termio"
		else
			USE=" -DUSE_SGTTY"
			args="$args --ioctl=sgtty"
		fi
	fi
	;;
esac
case "$SYS" in
  *aix*)
	# Because the termcap database has no entry for xterm
	TLIBS="-lcurses"
	;;
  *linux*)
	if [ ! -f /usr/lib/libtermcap.a -a ! -f /lib/libtermcap.a ]
	then
		if [ -f /usr/lib/libncurses.a -o -f /usr/lib/ncurses.a ]
		then
			TLIBS="-lncurses"
		else
			TLIBS="-lcurses"
		fi
	fi
	;;
  *osf*)
	NEED_TGETENT=define
	#TLIBS="-lucb -lcurses"
	TLIBS="-ltermcap"
	;;
  *ultrix*)
	CC="cc -std"
	NEED_STRDUP=define
	TLIBS="-lcurses -ltermcap"
	if [ "$GUI_X11" = "define" ]
	then
		XLIBS=" -ldnet"
	fi
	;;
  *hp-ux*)
	CC="cc -Ae"
	gnu=""
	NEED_OSPEED=define
	TLIBS="-lcurses -ltermcap"
	;;
  *solaris2*)
	CC="cc -O -Dconst="
	TLIBS="-lcurses"
	if [ "$GUI_X11" = "define" ]
	then
		XLIBS=" -lsocket -lnsl"
		xlibdir=`dirname "$xlib"`
		XLIBS=" -R$xlibdir$XLIBS"
	fi
	;;
  *solaris*)
	# This is only for old solaris systems
	CC="cc -O -Dconst="
	TLIBS="-L/usr/ucblib -lucb -lcurses -ltermcap"
	;;
  *sunos*)
	CC="cc -O -Dconst="
	TLIBS="-ltermcap"
	;;
  *sco*)
	tmp=`searchpath icc $GNUPATH`
	if [ "$tmp" ]
	then
		CC="icc"
		# but it may be overridden by gcc
	fi
	if [ "$GUI_X11" = "define" ]
	then
		XLIBS=" -lsocket"
	fi
	;;
  *xenix*)
	TLIBS="-lx -ltermcap"
	if [ "$GUI_X11" = "define" ]
	then
		XLIBS=" -lsocket"
	fi
	;;
  *freebsd*)
	;;
  *bsd*)
	tmp=`searchpath shlicc2 $GNUPATH`
	if [ "$tmp" ]
	then
		CC="shlicc2"
		gnu=""
	fi
	if [ "$GUI_X11" = "define" ]
	then
		XLIBS=" -lipc"
	fi
	;;
  *irix*)
  	# If "cc" in installed, use it in preference to "gcc"
	tmp=`searchpath cc $GNUPATH`
	if [ "$tmp" ]
	then
		CC="cc"
		gnu=""
	fi
esac
if [ -f /usr/bin/lp ]
then
	LPOUT="!lp -s"
fi

# Add non-X11 libraries to args via the --libs=... flag
if [ "$TLIBS" ]
then
	args="$args --libs='$TLIBS'"
fi

# If "gcc" is available, and CC didn't come from environment variables, then
# use "gcc" instead of plain old "cc"
if [ "$gnu" ]
then
	CC="gcc -O2"
fi

################################################################################

# Save these arguments in a "config.stat" script
echo exec configure $args $SYS >config.stat

# Tell the user what we discovered
echo "System:   $SYS"
echo "Options: $args"
echo "Compiler: $CC"

################################################################################

#Set some options that'll be used in the here-files below
CC="$CC$USE"
if [ "$GUI_X11" = "define" ]
then
	case "$xlib" in
	  /lib/libX11.a|/usr/lib/libX11.a|"")
		XLIBS="-lX11$XLIBS"
		;;
	  *)
		XLIBS="-L`echo $xlib | sed 's/\/libX11.a$//'` -lX11$XLIBS"
		;;
	esac
	case "$xinc" in
	  /usr/include/X11/Xresource.h)
		;;
	  *)
		CC="$CC -I"`echo $xinc | sed 's/X11\/Xresource.h$//'`
		;;
	esac
fi
if [ "$LIBS" = "" ]
then
	LIBS=${TLIBS:--ltermcap}
fi
case "$LIBS" in
  *ncurses*) NEED_BC=undef;;
  *)	     NEED_BC=define;;
esac


################################################################################


# Generate the "config.h" file
cat >config.h <<eof-config
/* config.h */

/* Originally, this file was automatically generated by the "configure"
 * shell script.
 *
 * This file contains C macro definitions which indicate which features
 * are to be supported, and which library functions are to be emulated.
 * In general, #define enables the feature or emulating function, and
 * #undef disables the feature or causes the library function to be used.
 */


/* The following determine which user interfaces are to be supported */
#${GUI_X11:-undef}	GUI_X11		/* simple X-windows interface */
#undef	GUI_CURSES	/* curses interface */
#define	GUI_TERMCAP	/* termcap interface */
#define	GUI_OPEN	/* open-mode only, does nothing fancy */
#undef	GUI_MFC  	/* MS-Windows gui interface */


/* These allow you to selectively disable the display modes, network protocols,
 * and other optional features.  If you disable the markup display modes then
 * the :help command is disabled because it depends on the "html" markup display
 * mode.  #define to enable the mode, #undef to exclude it.
 */
#define	DISPLAY_HEX	/* hex		interactive hex dump */
#define	DISPLAY_MARKUP	/* html/man/tex	formatted text */
#define	DISPLAY_SYNTAX	/* syntax	generic syntax coloring */
#${PROTOCOL_HTTP}	PROTOCOL_HTTP	/* define to enable HTTP; undef to disable */
#${PROTOCOL_FTP}	PROTOCOL_FTP	/* define to enable FTP; undef to disable */
#define	FEATURE_SHOWTAG	/* the showtag option */
#define	FEATURE_LPR	/* the :lpr command */
#define	FEATURE_ALIAS	/* the :alias command */
#define	FEATURE_MKEXRC	/* the :mkexrc command */


/* The following provide custom implementation of some common functions which
 * are either missing or poorly implemented on some systems.
 */
#undef	NEED_ABORT	/* replaces abort() with a simpler macro */
#undef	NEED_ASSERT	/* defines a custom assert() macro */
#${NEED_TGETENT:-undef}	NEED_TGETENT	/* causes tinytcap.c to be used instead of library */
#${NEED_WINSIZE:-undef}	NEED_WINSIZE	/* includes <ptem.h> -- required by SCO */
#${NEED_SPEED_T:-undef}	NEED_SPEED_T	/* includes <termcap.h> -- common on POSIX systems */
#${NEED_STRDUP:-undef}	NEED_STRDUP	/* uses a custom version of strdup() */
#${NEED_MEMMOVE:-undef}	NEED_MEMMOVE	/* uses a custom version of memmove() */
#${NEED_OSPEED:-undef}	NEED_OSPEED	/* causes guitcap.c to supply an ospeed variable */
#${NEED_BC:-undef}	NEED_BC		/* causes guitcap.c to supply a BC variable */
#${NEED_SETPGID:-undef}	NEED_SETPGID	/* use setpgrp() instead of setpgid() */
#define	NEED_CTYPE	/* uses a custom <ctype.h>, driven by :digraph */
#${NEED_WAIT_H:-undef}	NEED_WAIT_H	/* must include <sys/wait.h> */
#${NEED_SELECT_H:-undef}	NEED_SELECT_H	/* must include <sys/select.h> */
#${NEED_IOCTL_H:-undef}	NEED_IOCTL_H	/* must include <sys/ioctl.h> */
#${NEED_XOS_H:-undef}	NEED_XOS_H	/* must include <X11/Xos.h> */
#${NEED_IN_H:-undef}	NEED_IN_H	/* must include <netinet/in.h> */
#${NEED_SOCKET_H:-undef}	NEED_SOCKET_H	/* must include <sys/socket.h> */
#${NEED_XRMCOMBINEFILEDATABASE:-undef}	NEED_XRMCOMBINEFILEDATABASE	/* X11R4 needs this */
#${NEED_INET_ATON:-undef}	NEED_INET_ATON	/* SunOS & Solaris need this */

/* The following control debugging features.  NDEBUG slows elvis down a lot,
 * and the others tend to make it output some confusing messages, so these
 * are all disabled by default.  (Note that NDEBUG is #define'd to disable it)
 */
#define	NDEBUG		/* undef to enable assert() calls; define to disable */
#undef	DEBUG_ALLOC	/* define to debug memory allocations; undef to disable */
#undef	DEBUG_SCAN	/* define to debug character scans; undef to disable */
#undef	DEBUG_SESSION	/* define to debug the block cache; undef to disable */
#undef	DEBUG_EVENT	/* define to trace events; undef to disable */
#undef	DEBUG_MARKUP	/* define to debug markup display modes */



/* The following macros, and their values, are mostly used to determine the
 * default values of some options.
 */
#define	OSLPOUT	"${LPOUT:-!lpr}"	/* default value of lpout option */
#define OSLIBPATH "~/.elvislib:/etc/elvis:${LIBDIR}:/usr/doc/elvis"	/* default elvispath */
eof-config


################################################################################


# Generate a sed script for converting "Makefile.in" to "Makefile"
tmp=mfsed.$$
case "$SYS" in

*sunos*)
cat >$tmp <<eof-sunos
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC -DUSE_SGTTY!
eof-sunos
;;

*solaris*)
cat >$tmp <<eof-solaris
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC!
eof-solaris
;;

*osf*)
cat >$tmp <<eof-osf
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC!
eof-osf
;;

*ultrix*)
cat >$tmp <<eof-ultrix
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC!
eof-ultrix
;;

*hp-ux*)
cat >$tmp <<eof-hp-ux
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC!
eof-hp-ux
;;

*linux*)
cat >$tmp <<eof-linux
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC!
s!^ALL=.*!ALL=elvis\$(EXE) ref\$(EXE) ctags\$(EXE) fmt\$(EXE)!
eof-linux
;;

*sco*)
cat >$tmp <<eof-sco
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC!
eof-sco
;;

*xenix*)
cat >$tmp <<eof-xenix
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC!
eof-xenix
;;

*bsd*)
cat >$tmp <<eof-bsd
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC!
eof-bsd
;;

*qnx*)
cat >$tmp <<eof-qnx
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC -D_POSIX_SOURCE!
eof-qnx
;;

*aix*)
cat >$tmp <<eof-aix
s!^# Makefile.in\$!# Makefile - configured for $SYS!
s!^CC=.*!CC=$CC -D_BSD!
eof-aix
;;

*)
cat >$tmp <<eof-generic
s!^# Makefile.in\$!# Makefile - configured for generic Unix!
s!^CC=.*!CC=$CC!
eof-generic
;;

esac
cat >>$tmp <<eof-all
s!^LIBS=.*!LIBS=$XLIBS $LIBS!
s!^BINDIR=.*!BINDIR=$BINDIR!
s!^LIBDIR=.*!LIBDIR=$LIBDIR!
eof-all

# Run "Makefile.in" through that sed script, to produce "Makefile"
sed -f $tmp Makefile.in >Makefile && rm $tmp

# Some parting advice
case "$SYS" in
  *solaris*|*sunos*)
	if [ "$GUI_X11" = "define" ]
	then
		xlibdir=`dirname "$xlib"`
		case "$LD_LIBRARY_PATH" in
		  *X11*|*openwin*)
			# Probably do nothing
			;;
		  "")
			# set path = xlibdir
			echo "You *may* need to..."
			echo
			case "$SHELL" in
			  *csh)
			  	echo "     setenv LD_LIBRARY_PATH=$xlibdir"
				;;
			  *)
				echo "     LD_LIBRARY_PATH=$xlibdir"
				echo "     export LD_LIBRARY_PATH"
				;;
			esac
			echo
			echo "... before you can run elvis, but try running it without doing that first."
			;;
		  *)
			# add xlibdir to path
			echo "You may need to..."
			echo
			echo "     LD_LIBRARY_PATH=\$LD_LIBRARY_PATH:$xlibdir"
			echo "     export LD_LIBRARY_PATH"
			echo
			echo "... before you can run elvis"
			;;
		esac
	fi
	;;
esac