configure

#!/bin/sh

undo=1
show_region=1
zlib=0
spell=0
termcap=0
terminfo=0
count=0

do_help() {
    echo "Optional features:"
    echo "  --enable-clang	Enable clang compiler"
    echo "  --enable-spell	Enable spell commands"
    echo "  --enable-zlib		Enable gzip compression support"
    echo "  --enable-termcap	Enable termcap."
    echo "  --enable-terminfo	Enable terminfo."
    echo "  --enable-sysv4	Enable if signal handlers cannot reset themselves"
    echo "  --enable-undo		Enable undo"
    echo "  --enable-huge       Enable HUGE_FILES"
    echo "  --enable-huge-threaded Enable HUGE_THREADED"
    echo
    echo "To disable a feature replace --enable with --disable."

    exit 0
}

set_one() {
    [ -n "$2" ] && echo "#define $1 $2" >> config.h
}

set_if_one() {
    [ -n "$2" -a "$2" -eq 1 ] && echo "#define $1 $2" >> config.h
}

while [ -n "$1" ]; do
    case "$1" in
      --enable-*) enable=1;;
      --disable-*) enable=0;;
      --help) do_help;;
      -h) do_help;;
      *) echo "Unknown arg '$1' ignored"; shift; continue;;
    esac

    case "$1" in
      *-clang) clang=$enable;;
      *-termcap) termcap=$enable;;
      *-terminfo) terminfo=$enable;;
      *-spell) spell=$enable;;
      *-zlib) zlib=$enable;;
      *-sysv4) sysv4=$enable;;
      *-undo) undo=$enable;;
      *-huge) huge=$enable;;
      *-huge-threaded) huge_threaded=$enable;;
      *) echo "Unknown arg '$1' ignored";;
    esac

    count=$(($count + 1))
    shift
done

if [ "$termcap" = 1 -a "$terminfo" = 1 ]; then
    echo "Make up your mind... termcap OR terminfo"
    exit 1
fi

if [ "$clang" = 1 ]; then
    sed 's/^#CC = clang/CC = clang/' Makefile > Makefile.tmp
    mv Makefile.tmp Makefile
    [ $count -eq 1 ] && exit 0
else
    sed 's/^CC = clang/#CC = clang/' Makefile > Makefile.tmp
    mv Makefile.tmp Makefile
fi

if [ $zlib = 1 -a ! -f /usr/include/zlib.h ]; then
    echo "Missing zlib.h"
    exit 1
fi
if [ $spell = 1 ]; then
    if [ ! -f /usr/include/aspell.h -o ! -f /usr/include/dlfcn.h ]; then
	echo "Missing aspell.h and/or dhfcn.h"
	exit 1
    fi
fi

echo "/* Generated by configure `date` */" > config.h

if [ $termcap = 1 ]; then
    sed 's/#LIBS += -ltermcap/LIBS += -ltermcap/' Makefile > Makefile.tmp
    mv Makefile.tmp Makefile
fi

set_if_one TERMCAP $termcap

if [ $terminfo = 1 ]; then
    sed 's/#LIBS += -lncurses/LIBS += -lncurses/' Makefile > Makefile.tmp
    mv Makefile.tmp Makefile
fi

set_if_one TERMINFO $terminfo

if [ -f /usr/include/termios.h ]; then
    true
elif [ -f /usr/include/termio.h ]; then
    echo "#define HAVE_TERMIO 1" >> config.h
else
    echo "WARNING: No terminal setup found."
fi
echo >> config.h

[ "$sysv4" = 1 ] && echo "#define SYSV4" >> config.h

set_one SPELL $spell
set_one ZLIB $zlib
set_one UNDO $undo

if [ "$spell" = 1 ]; then
    sed 's/^#LIBS += -ldl/LIBS += -ldl/' Makefile > Makefile.tmp
else
    sed 's/^LIBS += -ldl/#LIBS += -ldl/' Makefile > Makefile.tmp
fi
mv Makefile.tmp Makefile

if [ "$zlib" = 1 ]; then
    sed 's/^#LIBS += -lz/LIBS += -lz/' Makefile > Makefile.tmp
else
    sed 's/^LIBS += -lz/#LIBS += -lz/' Makefile > Makefile.tmp
fi
mv Makefile.tmp Makefile

if [ "$huge" = 1 ]; then
    echo "--enable-huge is very experimental. IT CAN CORRUPT FILES."
    echo "You have been warned!!!"
    echo >> config.h
    echo "#define HUGE_FILES 1" >> config.h
    if [ "$huge_threaded" = 1 ]; then
	echo "#define HUGE_THREADED 1" >> config.h
	sed 's/^#LIBS += -lpthread/LIBS += -lpthread/' Makefile > Makefile.tmp
	mv Makefile.tmp Makefile
    fi
else
    sed 's/^LIBS += -lpthread/#LIBS += -lpthread/' Makefile > Makefile.tmp
    mv Makefile.tmp Makefile
fi

cat >> config.h <<EOF

#ifdef __unix__
#define DOPIPES
#endif

/* Don't touch these unless you really know what you are doing. */
#define UNSIGNED_BYTES
#define HAVE_GLOBAL_MARKS
#define HAVE_BUFFER_MARKS
EOF

cat > ztmp.c <<EOF
#define _GNU_SOURCE
#include <string.h>
void *foo(const void *s) { return memrchr(s, ' ', 1); }
EOF

cc -Wall -Werror -c ztmp.c >/dev/null 2>&1 || echo "#define NO_MEMRCHR" >> config.h
rm -f ztmp.c ztmp.o