# This script follows 
# http://www.gnu.org/software/autoconf/manual/html_node/Autoconf-Input-Layout.html#Autoconf-Input-Layout
# Please keep it like that.

# Guessing some version.
AC_PREREQ(2.54)

m4_define([ccss_version_major], [0])
m4_define([ccss_version_minor], [6])
m4_define([ccss_version_micro], [0])
m4_define([ccss_version_extra], [])
m4_define([ccss_version],
    [ccss_version_major.ccss_version_minor.ccss_version_micro[]ccss_version_extra])

m4_define([ccss_cairo_appearance_module_interface_version], [0.4])

AC_INIT([ccss], [ccss_version])
AC_CONFIG_AUX_DIR([build])
AC_CONFIG_MACRO_DIR([build])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_SRCDIR([ccss/ccss-stylesheet.c])

AM_INIT_AUTOMAKE

dnl Version info for libraries = CURRENT:REVISION:AGE
dnl
dnl Within each x.y.*, ABI is maintained backward and _forward_ compatible.
dnl (As a consequence, no exported function may be added.)
dnl So it's enough to have one interface number per each x.y.* branch.
dnl
dnl OTOH, we are not able to keep ABI strictly backward compatible throughout
dnl the whole x.*.*.
dnl The easiest way is to declare no ABI compatibility, ie. AGE is always 0.
dnl
m4_define([version_iface],
	m4_eval(100 * ccss_version_major + ccss_version_minor))

AC_SUBST([VERSION_INFO], [version_iface:ccss_version_micro:0])
AC_SUBST([CCSS_VERSION_MAJOR], [ccss_version_major])
AC_SUBST([CCSS_VERSION_MINOR], [ccss_version_minor])
AC_SUBST([CCSS_VERSION_MICRO], [ccss_version_micro])

### Checks for configure arguments. ############################################

AC_ARG_ENABLE([debug], 
  [AS_HELP_STRING([--enable-debug], [enable debug code])], 
[
  enable_debug="$enableval"
],[
  enable_debug="no"
])

if test "$enable_debug" == "yes"; then
  AC_DEFINE([CCSS_DEBUG], [1], [enable debug code])
  CFLAGS="-g -O0 ${CFLAGS}"
fi
AM_CONDITIONAL([CCSS_DEBUG], test "$enable_debug" == "yes")


# So usually one just sets CFLAGS for this, but a configure 
# arguments lets us force this when running `make distcheck'.
AC_ARG_ENABLE([werror], 
  [AS_HELP_STRING([--enable-werror], [bail on warnings])], 
[
  if test "$enableval" == "yes"; then
    CFLAGS="$CFLAGS -Werror"
  fi  
])



### Checks for programs. #######################################################

AC_PROG_CC
AM_PROG_CC_C_O
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET

# Should be replaced by LT_INIT, which apparently doesn't work.
# Try again some time.
AC_DISABLE_STATIC
AC_LIBTOOL_WIN32_DLL
AC_PROG_LIBTOOL 

# gtk-doc
gtk_doc_installed=true
#ifdef([GTK_DOC_CHECK],[GTK_DOC_CHECK([1.0])],[gtk_doc_installed=false])
# I would have liked to conditionalize this, but 
# that appears to break other things http://bugzilla.gnome.org/show_bug.cgi?id=156399
GTK_DOC_CHECK([1.0])
AM_CONDITIONAL(GTK_DOC_INSTALLED, $gtk_doc_installed)

# hardwire-enable testing
enable_glibtest="yes"
AM_CONDITIONAL(ENABLE_GLIB_TEST, test "$enable_glibtest" = "yes")


### Checks for libraries. ######################################################


### ccss ###

ccss_reqs='glib-2.0 libcroco-0.6'
ccss_pkgs=

# See http://bugzilla.gnome.org/show_bug.cgi?id=553937 .
PKG_CHECK_EXISTS([ libcroco-0.6 >= 0.6.2 ],
[
  enable_libcroco_workaround="no"
],[
  enable_libcroco_workaround="yes"
])
if test "$enable_libcroco_workaround" = "yes"; then
  AC_DEFINE([CCSS_ENABLE_LIBCROCO_WORKAROUND], [1], [Work around libcroco issue #553937])
fi

# Unconditional requirement.
ccss_pkgs=${ccss_reqs}

PKG_CHECK_MODULES([CCSS], $ccss_pkgs)

# AC_SUBST([CCSS_CFLAGS]) # set further down
AC_SUBST([CCSS_LIBS])
AC_SUBST([CCSS_DEPS], $ccss_pkgs)


### ccss-cairo ###

ccss_cairo_reqs='cairo >= 1.4'
ccss_cairo_pkgs=

AC_ARG_ENABLE([ccss-cairo],
              [AS_HELP_STRING([--disable-ccss-cairo], [disable the build of ccss-cairo.])],
[
  want_cairo="$enableval"
], [
  want_cairo="yes"
])

if test "$want_cairo" = "yes"; then
  ccss_cairo_pkgs="$ccss_pkgs $ccss_cairo_reqs"
  AC_DEFINE([CCSS_WITH_CAIRO], [1], [Cairo drawing support])
fi
AM_CONDITIONAL([CCSS_WITH_CAIRO], [test "$want_cairo" = "yes"])
AC_SUBST([ccss_with_cairo], [$want_cairo])


### use librsvg?

ccss_cairo_rsvg_reqs='librsvg-2.0 >= 2.16'

AC_ARG_WITH([rsvg],
            [AS_HELP_STRING([--without-rsvg], [ccss-cairo: do not build SVG image support.])],
[
  want_rsvg="$withval"  
], [
  want_rsvg="yes"
])

if test "$want_rsvg" = "yes"; then
  ccss_cairo_pkgs="$ccss_cairo_pkgs $ccss_cairo_rsvg_reqs"
  AC_DEFINE([CCSS_WITH_RSVG], [1], [SVG support through librsvg])
fi
AM_CONDITIONAL([CCSS_WITH_RSVG], [test "$want_rsvg" = "yes"])
AC_SUBST([ccss_with_rsvg], [$want_rsvg])


### use libsoup?

want_soup="no"
if test "$want_rsvg" = "yes"; then

  ccss_cairo_soup_reqs='libsoup-2.4 librsvg-2.0 >= 2.22.4'

  AC_ARG_WITH([soup],
              [AS_HELP_STRING([--without-soup], [ccss-cairo: do not build SVG fragment support.])],
  [
    want_soup="$withval"  
  ], [
    want_soup="yes"
  ])

fi

if test "$want_soup" = "yes"; then
  ccss_cairo_pkgs="$ccss_cairo_pkgs $ccss_cairo_soup_reqs"
  AC_DEFINE([CCSS_WITH_SOUP], [1], [SVG fragment support through libsoup and librsvg-2.0 >= 2.22.4])
fi
AM_CONDITIONAL([CCSS_WITH_SOUP], [test "$want_soup" = "yes"])
AC_SUBST([ccss_with_soup], [$want_soup])


### check
if test "$want_cairo" = "yes"; then
  PKG_CHECK_MODULES([CCSS_CAIRO], $ccss_cairo_pkgs)
fi

# AC_SUBST([CCSS_CAIRO_CFLAGS]) # set further down
CCSS_CAIRO_LIBS="${CCSS_CAIRO_LIBS} "'$(top_builddir)/ccss/libccss-1.la'
AC_SUBST([CCSS_CAIRO_LIBS])
AC_SUBST([CCSS_CAIRO_DEPS], "$ccss_cairo_pkgs ccss-1")

CCSS_CAIRO_APPEARANCE_MODULE_INTERFACE_VERSION=ccss_cairo_appearance_module_interface_version
AC_SUBST([CCSS_CAIRO_APPEARANCE_MODULE_INTERFACE_VERSION])
CCSS_CAIRO_APPEARANCE_MODULE_PATH="${libdir}/ccss-1/$CCSS_CAIRO_APPEARANCE_MODULE_INTERFACE_VERSION"
AC_SUBST([CCSS_CAIRO_APPEARANCE_MODULE_PATH])


### ccss-gtk ###

ccss_gtk_reqs='gtk+-2.0 >= 2.10'
ccss_gtk_pkgs=

AC_ARG_ENABLE([ccss-gtk],
              [AS_HELP_STRING([--disable-ccss-gtk], [disable the build of ccss-gtk.])],
[
  want_gtk="$enableval"
], [
  want_gtk="yes"
])

if test "$want_gtk" = "yes"; then
  ccss_gtk_pkgs="$ccss_cairo_pkgs $ccss_gtk_reqs"
  AC_DEFINE([CCSS_WITH_GTK], [1], [Gtk+ toolkit support])
fi
AM_CONDITIONAL([CCSS_WITH_GTK], [test "$want_gtk" = "yes"])
AC_SUBST([ccss_with_gtk], [$want_gtk])


### check
if test "$want_gtk" = "yes"; then
  PKG_CHECK_MODULES([CCSS_GTK], $ccss_gtk_pkgs)
fi

# AC_SUBST([CCSS_GTK_CFLAGS]) # set further down
CCSS_GTK_LIBS="${CCSS_GTK_LIBS} "'$(top_builddir)/ccss/libccss-1.la $(top_builddir)/ccss-cairo/libccss-cairo-1.la'
AC_SUBST([CCSS_GTK_LIBS])
AC_SUBST([CCSS_GTK_DEPS], "$ccss_gtk_reqs ccss-cairo-1")


### examples ###

ccss_examples_reqs='gtk+-2.0 >= 2.10 librsvg-2.0'
ccss_examples_pkgs=

AC_ARG_ENABLE([examples],
              [AS_HELP_STRING([--disable-examples], [disable the build of examples.])],
[
  want_examples="$enableval"
], [
  want_examples="yes"
])

if test "$want_examples" = "yes"; then
  ccss_examples_pkgs="$ccss_cairo_pkgs $ccss_examples_reqs"
  AC_DEFINE([CCSS_WITH_EXAMPLES], [1], [Build examples.])
fi
AM_CONDITIONAL([CCSS_WITH_EXAMPLES], [test "$want_examples" = "yes"])
AC_SUBST([ccss_with_examples], [$want_examples])

### check

if test "$want_examples" = "yes"; then
  PKG_CHECK_MODULES([CCSS_EXAMPLES], $ccss_examples_pkgs)
fi

# AC_SUBST([CCSS_EXAMPLES_CFLAGS]) # set further down
AC_SUBST([CCSS_EXAMPLES_LIBS])
AC_SUBST([CCSS_EXAMPLES_DEPS], $ccss_examples_pkgs)



### Checks for header files. ###################################################

AC_HEADER_STDC
AC_CHECK_HEADERS([stdbool.h stddef.h stdint.h stdio.h stdlib.h string.h])



### Checks for typedefs, structures, and compiler characteristics. #############

AC_C_CONST

extra_cflags=
if test "$GCC" = "yes"; then
  orig_cflags=${CFLAGS}
  for option in -std=c99 -pedantic -Wall -Wbitwise -Wcast-to-as			\
    -Wchar-subscripts -Wdeclaration-after-statement -Wdefault-bitfield-sign	\
    -Wdo-while -Wmissing-declarations -Wmissing-noreturn -Wmissing-prototypes	\
    -Wnested-externs -Wno-pointer-sign -Wparen-string -Wpointer-arith		\
    -Wptr-subtraction-blows -Wreturn-void -Wsign-compare -Wstrict-prototypes	\
    -Wtypesign -Wwrite-strings ; do
    SAVE_CFLAGS="$CFLAGS"
    CFLAGS="$CFLAGS $option"
    AC_MSG_CHECKING([whether gcc understands $option])
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[has_option=yes],[has_option=no])
    if test $has_option = no; then
      CFLAGS="$SAVE_CFLAGS"
    else
      extra_cflags="${extra_cflags} $option"
    fi
    AC_MSG_RESULT($has_option)
    unset has_option
    unset SAVE_CFLAGS
  done
  unset option
  CFLAGS=${orig_cflags}
fi

CCSS_CFLAGS="${CCSS_CFLAGS} ${extra_cflags}"
AC_SUBST([CCSS_CFLAGS])

CCSS_CAIRO_CFLAGS="${CCSS_CAIRO_CFLAGS} ${extra_cflags}"
AC_SUBST([CCSS_CAIRO_CFLAGS])

CCSS_GTK_CFLAGS="${CCSS_GTK_CFLAGS} ${extra_cflags}"
AC_SUBST([CCSS_GTK_CFLAGS])

CCSS_EXAMPLES_CFLAGS="${CCSS_EXAMPLES_CFLAGS} ${extra_cflags}"
AC_SUBST([CCSS_EXAMPLES_CFLAGS])

SHAVE_INIT([build])

AC_CONFIG_FILES([
  Makefile

  build/Makefile
  build/shave
  build/shave-libtool

  ccss-1.pc
  ccss/Makefile
  ccss-doc/Makefile
  ccss-doc/version.xml
  ccss-tests/Makefile

  ccss-cairo-1.pc
  ccss-cairo/Makefile
  ccss-cairo-doc/Makefile
  ccss-cairo-doc/version.xml

  ccss-gtk-1.pc
  ccss-gtk/Makefile
  ccss-gtk-doc/Makefile
  ccss-gtk-doc/version.xml

  examples/Makefile
])
AC_OUTPUT

echo "
Configuration
-------------

Configuration:
    Build debugging code         $enable_debug

ccss:                            yes
    Workaround for #553937       $enable_libcroco_workaround (see bugzilla.gnome.org)

ccss-cairo:                      $want_cairo (requires $ccss_cairo_reqs)
    Support for SVG images       $want_rsvg (requires $ccss_cairo_rsvg_reqs)
    Support for SVG fragments    $want_soup (requires $ccss_cairo_soup_reqs)
    Appearance module path       $CCSS_CAIRO_APPEARANCE_MODULE_PATH

ccss-gtk:                        $want_gtk (requires $ccss_gtk_reqs)

examples:                        $want_examples (requires $ccss_examples_reqs)
"