# sanity
AC_INIT(Logging.hs)

# Prepare to generate the config.h.in file
AC_CONFIG_HEADERS([cbits/config.h])

# this is arbitrary
AC_PREREQ([2.52])

#
# Looking for HC, stolen from $fptools
#
AC_ARG_WITH(hc,
[AC_HELP_STRING([--with-hc=ARG],
    [Use ARG as the path to a Haskell compiler [default=autodetect]])],
[ WithGhc="$withval" 
  if test "$WithGhc" = "nhc98"; then
    AC_DEFINE(__NHC__, [], [Defined if compiling with nhc98])
    SYMS="$SYMS -D__NHC__"
  fi
],
[
  if test "$GHC" = ""; then
    AC_CHECK_PROGS(GHC,ghc)
  fi
  if test "$GHC" = ""; then
    AC_CHECK_PROGS(GHC,nhc98)
  fi
  if test "$GHC" = "nhc98"; then
    AC_DEFINE(__NHC__, [], [Defined if compiling with nhc98])
    SYMS="$SYMS -D__NHC__"
  fi
  WithGhc=`which $GHC`
])
AC_SUBST(WithGhc)

# code generation option for GHC (normally, we want to use `-fvia-C', however,
# with ghc-6.4 -fvia-C produces a buggy binary, dying with:
#       user error (Curses[-1]:keypad))
if test x`$WithGhc --numeric-version 2> /dev/null | sed 's/\(.*\)\..*/\1/'` = "x6.4"; then
  GhcCodegen="-fasm"
else
  GhcCodegen="-fvia-C"
fi
AC_SUBST(GhcCodegen)

# For icfp05, we support GHC 6.4 only!
if test x`$WithGhc --numeric-version 2> /dev/null | sed 's/\(.*\..*\)\..*/\1/'` = "x6.4"; then
  AC_MSG_NOTICE(Found GHC version 6.4)
else
  AC_MSG_ERROR(Need GHC 6.4!)
fi

#
# Look for a ghc-pkg that matches our ghc version.
#
ghc_pkg_guess=`dirname $WithGhc`/ghc-pkg-`$WithGhc --numeric-version`
if "$ghc_pkg_guess" -l > /dev/null 2>&1; then
      matching_ghc_pkg=$ghc_pkg_guess
else
      matching_ghc_pkg=no
fi
if test x"$matching_ghc_pkg" = xno; then
    AC_CHECK_PROG(GhcPkgCmd, ghc-pkg, ghc-pkg)
else
    GhcPkgCmd=$matching_ghc_pkg
fi
AC_SUBST(GhcPkgCmd)

# check if ghc-pkg has version >= or < 6.4
# ghcPkgVersion=`$GhcPkgCmd --version | sed 's/GHC package manager version //'`
# echo -e "$ghcPkgVersion\n6.3" | sort -c > /dev/null 2>&1
# sorted=$?
# if test $sorted -eq 0; then
#   cp ./hscurses.conf.m4.in.before64 ./hscurses.conf.m4.in
# else
#   cp ./hscurses.conf.m4.in.64 ./hscurses.conf.m4.in
# fi

#
# Look for a hsc2hs that matches our ghc version.
#
hsc2hs_guess=`dirname $WithGhc`/hsc2hs
if "$hsc2hs_guess" -V > /dev/null 2>&1; then
  Hsc2hsCmd=$hsc2hs_guess
else
  AC_CHECK_PROG(Hsc2hsCmd, hsc2hs, hsc2hs)
fi
AC_SUBST(Hsc2hsCmd)


#
# And some other tools
#
# AC_CHECK_PROG(AlexCmd,alex,alex)
# AC_CHECK_PROG(HappyCmd,happy,happy)
AC_CHECK_PROG(GccCmd, gcc, gcc)
AC_CHECK_PROG(HaddockCmd,haddock,haddock)

AC_CHECK_PROG(STRIP,strip,strip)
AC_PATH_PROG(LdCmd,ld)

# Use GNU m4, which is called gm4 on *BSD
if gm4 --version > /dev/null 2>&1 ; then
        AC_PATH_PROG(WithM4,gm4)
else
        AC_PATH_PROG(WithM4,m4)
fi

# check for -x flag to ld. stolen from $fptools
AC_DEFUN(FPTOOLS_LD_X,
[AC_CACHE_CHECK([whether ld understands -x], fptools_cv_ld_x,
[
echo 'foo() {}' > conftest.c
${CC-cc} -c conftest.c
if ${LdCmd} -r -x -o foo.o conftest.o; then
   fptools_cv_ld_x=yes 
else
   fptools_cv_ld_x=no
fi
rm -rf conftest.c conftest.o foo.o 
])
if test "$fptools_cv_ld_x" = yes; then
    LdXFlag=-x
else
    LdXFlag=
fi
AC_SUBST(LdXFlag)
])

FPTOOLS_LD_X

#
# May as well check for this
#
AC_PROG_RANLIB

## #
## # Curses. If you don't have wchar_t-aware ncurses (Debian package:
## # libncursesw5-dev),  uncomment the first line and comment-out the
## # two later. 
## #
## # The shell variables should be added to, e.g., $LIBS
## #
## AC_CHECK_LIB(curses,  addnstr)
## AC_CHECK_LIB(ncurses, addnstr)
## AC_CHECK_LIB(ncursesw,waddnwstr)
## 
## AC_CHECK_LIB(iconv, iconv)
## AC_CHECK_LIB(iconv, libiconv)
## 
## # Bit weird. On OpenBSD you need the 'lib' suffix to iconv functions, it seems
## AC_CHECK_FUNCS(libiconv, AC_DEFINE( [ICONV_LIB_PREFIX],[1],
##                 [Define to 1 if you need a 'lib' prefix to iconv functions]))
## 
## # On linux we need to call doupdate() after endwin() to restore the term
## if uname -s | grep Linux > /dev/null 2>&1 ; then
##     AC_DEFINE( [NCURSES_UPDATE_AFTER_END],[1],
##                [Define to 1 if you need to call doupdate after endwin])
## fi
## 
## # some special libs need to be set for package.conf files
## if echo "$LIBS" | grep iconv > /dev/null 2>&1 ; then
##     ICONV=iconv
## fi
## 
## if (echo "$LIBS" | grep ncursesw) >/dev/null 2>&1 ; then
##     CURSES=ncursesw
## elif (echo "$LIBS" | grep ncurses) >/dev/null 2>&1 ; then
##     CURSES=ncurses
## else
##     CURSES=curses
## fi
## AC_SUBST(ICONV)
## AC_SUBST(CURSES)

#
# Specific headers to check for
#
#AC_CHECK_HEADERS([iconv.h curses.h ncurses.h ncursesw/ncurses.h locale.h langinfo.h wchar.h limits.h signal.h ])
#AC_CHECK_HEADERS([ locale.h langinfo.h wchar.h limits.h signal.h ])

echo -n "Patch count : "
darcs changes --xml-output | sed -n '/TAG/q;/^<\/patch/p' | wc -l | sed 's/ *//g'

AC_SUBST(SYMS)

current_directory=`pwd`
AC_SUBST(current_directory)

AC_CONFIG_FILES([mk/config.mk icfp05.conf.m4 pp/logpp])
AC_CONFIG_COMMANDS([default], [chmod 700 pp/logpp] )
AC_OUTPUT