dnl Copyright © 2009, 2019 Nick Bowler
dnl
dnl License WTFPL2: Do What The Fuck You Want To Public License, version 2.
dnl This is free software: you are free to do what the fuck you want to.
dnl There is NO WARRANTY, to the extent permitted by law.

dnl DX_LIB_GLIB2([min-version], [modules], [action-if-ok], [action-if-fail])
dnl
dnl Search for GLib-2 libraries, with the given minimum version.  The modules
dnl argument specifies which additional GLib libraries are required, which is
dnl a space-separated list of zero or more of the following values:
dnl
dnl   gthread
dnl   gobject
dnl   gio
dnl   gio-unix
dnl   gmodule
dnl
dnl Each detected module's flags are set in LIBxxx_CFLAGS and LIBxxx_LIBS,
dnl where xxx is the module's name in all capital letters and with hyphens
dnl converted to underscores (cf. AS_TR_SH).  The core GLib flags are set
dnl in LIBGLIB_CFLAGS and LIBGLIB_LIBS.  The combination of all selected
dnl and detected modules is set in GLIB_CFLAGS and GLIB_LIBS.  All of
dnl these variables are substituted as normal.
dnl
dnl If GLib and all selected modules are successfully found, action-if-ok
dnl is run.  Otherwise, action-if-fail is run.  If necessary, use the
dnl dx_cv_libxxx_lib_found cache variables to determine exactly which
dnl modules are not available.
AC_DEFUN([DX_LIB_GLIB2],
[GLIB_CFLAGS= GLIB_LIBS= _dx_lib_glib_search_ok=true
m4_define([_DX_LIB_GLIB2_TESTHEAD], [#include <glib.h>])dnl
_DX_LIB_GLIB2_VERSION_TEST(m4_split([$1], [\.]))dnl
m4_define([_DX_LIB_GLIB2_TESTMAIN],
  [const char *v = glib_check_version(2,0,0);])dnl
m4_define([_DX_GLIB_MODULES], [glib])dnl
m4_append_uniq_w([_DX_GLIB_MODULES], [$2])dnl

m4_map_args_w(m4_defn([_DX_GLIB_MODULES]), [_DX_LIB_GLIB2_MODULE(], [)])
AC_SUBST([GLIB_CFLAGS])dnl
AC_SUBST([GLIB_LIBS])dnl
AS_IF([$_dx_lib_glib_search_ok], [$3], [m4_default([$4], [AC_MSG_FAILURE(
[GLib[]m4_ifnblank([$1], [ version $1 or newer]) is required.  The latest
version may be found at <https://www.gtk.org/>.
m4_newline([DX_LIB_USERFLAG_BLURB([libglib], [GLib])])
m4_newline([DX_LIB_PKGCONFIG_BLURB([glib], [GLib])])
])])])])

AC_DEFUN([_DX_LIB_GLIB2_MODULE],
[DX_LIB_SETUP([lib$1],
[m4_if([$1], [glib],     [GLib],
       [$1], [gio],      [GIO],
       [$1], [gio-unix], [GIO-Unix],
       [$1], [gthread],  [GThread],
       [$1], [gobject],  [GObject],
       [$1], [gmodule],  [GModule])])dnl
DX_LIB_PKGCONFIG_FLAGS([lib$1],
  [m4_if([$1], [gmodule], [gmodule-no-export-2.0], [$1-2.0])])
AC_MSG_CHECKING([for lib$1])
DX_LIB_SEARCH_LINK([lib$1],
  [AC_LANG_PROGRAM([_DX_LIB_GLIB2_TESTHEAD
m4_n(m4_if([$1], [gobject], [[#include <glib-object.h>]]))dnl
m4_n(m4_if([$1], [gio], [[#include <gio/gio.h>]]))dnl
m4_n(m4_if([$1], [gio-unix], [[#include <gio/gunixmounts.h>]]))dnl
m4_n(m4_if([$1], [gmodule], [[#include <gmodule.h>]]))],
    [_DX_LIB_GLIB2_TESTMAIN
m4_if([$1], [glib], [],
      [$1], [gobject], [g_type_init();
{ GObject *obj = g_object_new(G_TYPE_OBJECT, NULL); }],
      [$1], [gthread], [g_thread_init(NULL);
{ GThread *thr = g_thread_self(); }],
      [$1], [gio], [{ GFile *f = g_file_new_for_path("/"); }],
      [$1], [gio-unix], [{ GUnixMountEntry *m = g_unix_mount_at("/", NULL); }],
      [$1], [gmodule], [{ GModule *m = g_module_open(NULL, 0); }],
      [DX_LIB_COMPILE_ERROR([unsupported module])])])],
  [ [[$LIBGLIB_CFLAGS m4_if([$1], [glib], [], [m4_toupper([$lib$1_cflags])])],
     [$LIBGLIB_LIBS m4_if([$1], [glib], [], [m4_toupper([$lib$1_libs])])]],
    [[$AS_TR_SH([dx_cv_lib$1_pkg_cflags])],
     [$AS_TR_SH([dx_cv_lib$1_pkg_libs])],
     [test x"$AS_TR_SH([dx_cv_lib$1_pkg_found])" = x"yes"]],
    m4_if([$1], [gthread], [[[$LIBGLIB_CFLAGS -pthread],
          [-pthread -lgthread-2.0 -lglib-2.0]],])
    [[$LIBGLIB_CFLAGS], [m4_if([$1], [glib], [], [-l$1-2.0]) -lglib-2.0]],
  ])
AS_IF([test x"$AS_TR_SH([dx_cv_lib$1_lib_found])" = x"yes"],
[set -f
set x $AS_TR_SH([m4_toupper([lib$1_cflags])]); shift
for _dx_i
do
  for _dx_j in $GLIB_CFLAGS; do
    if test x"$_dx_i" = x"$_dx_j"; then
      shift; continue 2
    fi
  done
  set x ${1+"$[]@"} "$[]1"; shift; shift
done
GLIB_CFLAGS=${GLIB_CFLAGS:+"$GLIB_CFLAGS "}$[]*
set x $AS_TR_SH([m4_toupper([lib$1_libs])]); shift
for _dx_i
do
  for _dx_j in $GLIB_LIBS; do
    if test x"$_dx_i" = x"$_dx_j"; then
      shift; continue 2
    fi
  done
  set x ${1+"$[]@"} "$[]1"; shift; shift
done
GLIB_LIBS=$[]*${GLIB_LIBS:+" $GLIB_LIBS"}
set +f],
  [_dx_lib_glib_search_ok=false])
])

AC_DEFUN([_DX_LIB_GLIB2_VERSION_TEST], [m4_append([_DX_LIB_GLIB2_TESTHEAD], [
[#if !GLIB_CHECK_VERSION(]m4_default([$1],
[0]), m4_default([$2],
[0]), m4_default([$3],
[0]))
DX_LIB_COMPILE_ERROR([glib version insufficient])
#endif])])