dnl Perform a check for a feature for GStreamer
dnl Richard Boulton <richard-alsa@tartarus.org>
dnl Thomas Vander Stichele <thomas@apestaart.org> added useful stuff
dnl Last modification: 25/06/2001
dnl
dnl AG_GST_CHECK_FEATURE(FEATURE-NAME, FEATURE-DESCRIPTION,
dnl                   DEPENDENT-PLUGINS, TEST-FOR-FEATURE,
dnl                   DISABLE-BY-DEFAULT, ACTION-IF-USE, ACTION-IF-NOTUSE)
dnl
dnl This macro adds a command line argument to allow the user to enable
dnl or disable a feature, and if the feature is enabled, performs a supplied
dnl test to check if the feature is available.
dnl
dnl The test should define HAVE_<FEATURE-NAME> to "yes" or "no" depending
dnl on whether the feature is available.
dnl
dnl The macro will set USE_<FEATURE-NAME> to "yes" or "no" depending on
dnl whether the feature is to be used.
dnl Thomas changed this, so that when USE_<FEATURE-NAME> was already set
dnl to no, then it stays that way.
dnl
dnl The macro will call AM_CONDITIONAL(USE_<FEATURE-NAME>, ...) to allow
dnl the feature to control what is built in Makefile.ams.  If you want
dnl additional actions resulting from the test, you can add them with the
dnl ACTION-IF-USE and ACTION-IF-NOTUSE parameters.
dnl
dnl FEATURE-NAME        is the name of the feature, and should be in
dnl                     purely upper case characters.
dnl FEATURE-DESCRIPTION is used to describe the feature in help text for
dnl                     the command line argument.
dnl DEPENDENT-PLUGINS   lists any plug-ins which depend on this feature.
dnl TEST-FOR-FEATURE    is a test which sets HAVE_<FEATURE-NAME> to "yes"
dnl                     or "no" depending on whether the feature is
dnl                     available.
dnl DISABLE-BY-DEFAULT  if "disabled", the feature is disabled by default,
dnl                     if any other value, the feature is enabled by default.
dnl ACTION-IF-USE       any extra actions to perform if the feature is to be
dnl                     used.
dnl ACTION-IF-NOTUSE    any extra actions to perform if the feature is not to
dnl                     be used.
dnl
dnl
dnl thomas :
dnl we also added a history.
dnl GST_PLUGINS_YES will contain all plugins to be built
dnl                 that were checked through AG_GST_CHECK_FEATURE
dnl GST_PLUGINS_NO will contain those that won't be built

AC_DEFUN([AG_GST_CHECK_FEATURE],
[echo
AC_MSG_NOTICE(*** checking feature: [$2] ***)
if test "x[$3]" != "x"
then
  AC_MSG_NOTICE(*** for plug-ins: [$3] ***)
fi
dnl
builtin(define, [gst_endisable], ifelse($5, [disabled], [enable], [disable]))dnl
dnl if it is set to NO, then don't even consider it for building
NOUSE=
if test "x$USE_[$1]" = "xno"; then
  NOUSE="yes"
fi
AC_ARG_ENABLE(translit([$1], A-Z, a-z),
  [  ]builtin(format, --%-26s gst_endisable %s, gst_endisable-translit([$1], A-Z, a-z), [$2]ifelse([$3],,,: [$3])),
  [ case "${enableval}" in
      yes) USE_[$1]=yes;;
      no) USE_[$1]=no;;
      *) AC_MSG_ERROR(bad value ${enableval} for --enable-translit([$1], A-Z, a-z)) ;;
    esac],
  [ USE_$1=]ifelse($5, [disabled], [no], [yes]))           dnl DEFAULT

dnl *** set it back to no if it was preset to no
if test "x$NOUSE" = "xyes"; then
  USE_[$1]="no"
  AC_MSG_WARN(*** $3 pre-configured not to be built)
fi
NOUSE=

dnl *** If it's enabled

if test x$USE_[$1] = xyes; then
  dnl save compile variables before the test

  gst_check_save_LIBS=$LIBS
  gst_check_save_LDFLAGS=$LDFLAGS
  gst_check_save_CFLAGS=$CFLAGS
  gst_check_save_CPPFLAGS=$CPPFLAGS
  gst_check_save_CXXFLAGS=$CXXFLAGS

  HAVE_[$1]=no
  dnl TEST_FOR_FEATURE
  $4

  LIBS=$gst_check_save_LIBS
  LDFLAGS=$gst_check_save_LDFLAGS
  CFLAGS=$gst_check_save_CFLAGS
  CPPFLAGS=$gst_check_save_CPPFLAGS
  CXXFLAGS=$gst_check_save_CXXFLAGS

  dnl If it isn't found, unset USE_[$1]
  if test x$HAVE_[$1] = xno; then
    USE_[$1]=no
  else
    ifelse([$3], , :, [AC_MSG_NOTICE(*** These plugins will be built: [$3])])
  fi
fi
dnl *** Warn if it's disabled or not found
if test x$USE_[$1] = xyes; then
  ifelse([$6], , :, [$6])
  if test "x$3" != "x"; then
    GST_PLUGINS_YES="\t[$3]\n$GST_PLUGINS_YES"
  fi
  AC_DEFINE(HAVE_[$1], , [Define to enable $2]ifelse($3,,, [ (used by $3)]).)
else
  ifelse([$3], , :, [AC_MSG_NOTICE(*** These plugins will not be built: [$3])])
  if test "x$3" != "x"; then
    GST_PLUGINS_NO="\t[$3]\n$GST_PLUGINS_NO"
  fi
  ifelse([$7], , :, [$7])
fi
dnl *** Define the conditional as appropriate
AM_CONDITIONAL(USE_[$1], test x$USE_[$1] = xyes)
])

dnl Use a -config program which accepts --cflags and --libs parameters
dnl to set *_CFLAGS and *_LIBS and check existence of a feature.
dnl Richard Boulton <richard-alsa@tartarus.org>
dnl Last modification: 26/06/2001
dnl AG_GST_CHECK_CONFIGPROG(FEATURE-NAME, CONFIG-PROG-FILENAME, MODULES)
dnl
dnl This check was written for GStreamer: it should be renamed and checked
dnl for portability if you decide to use it elsewhere.
dnl
AC_DEFUN([AG_GST_CHECK_CONFIGPROG],
[
  AC_PATH_PROG([$1]_CONFIG, [$2], no)
  if test x$[$1]_CONFIG = xno; then
    [$1]_LIBS=
    [$1]_CFLAGS=
    HAVE_[$1]=no
  else
    if [$2] --plugin-libs [$3] &> /dev/null; then
      [$1]_LIBS=`[$2] --plugin-libs [$3]`
    else
      [$1]_LIBS=`[$2] --libs [$3]`
    fi
    [$1]_CFLAGS=`[$2] --cflags [$3]`
    HAVE_[$1]=yes
  fi
  AC_SUBST([$1]_LIBS)
  AC_SUBST([$1]_CFLAGS)
])

dnl Use AC_CHECK_LIB and AC_CHECK_HEADER to do both tests at once
dnl sets HAVE_module if we have it
dnl Richard Boulton <richard-alsa@tartarus.org>
dnl Last modification: 26/06/2001
dnl AG_GST_CHECK_LIBHEADER(FEATURE-NAME, LIB NAME, LIB FUNCTION, EXTRA LD FLAGS,
dnl                     HEADER NAME, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)
dnl
dnl This check was written for GStreamer: it should be renamed and checked
dnl for portability if you decide to use it elsewhere.
dnl
AC_DEFUN([AG_GST_CHECK_LIBHEADER],
[
  AC_CHECK_LIB([$2], [$3], HAVE_[$1]=yes, HAVE_[$1]=no,[$4])
  if test "x$HAVE_[$1]" = "xyes"; then
    AC_CHECK_HEADER([$5], :, HAVE_[$1]=no)
    if test "x$HAVE_[$1]" = "xyes"; then
      dnl execute what needs to be
      ifelse([$6], , :, [$6])
    else
      ifelse([$7], , :, [$7])
    fi
  else
    ifelse([$7], , :, [$7])
  fi
  AC_SUBST(HAVE_[$1])
]
)

dnl 2004-02-14 Thomas - changed to get set properly and use proper output
dnl 2003-06-27 Benjamin Otte - changed to make this work with gstconfig.h
dnl
dnl Add a subsystem --disable flag and all the necessary symbols and substitions
dnl
dnl AG_GST_CHECK_SUBSYSTEM_DISABLE(SYSNAME, [subsystem name])
dnl
AC_DEFUN([AG_GST_CHECK_SUBSYSTEM_DISABLE],
[
  dnl this define will replace each literal subsys_def occurrence with
  dnl the lowercase hyphen-separated subsystem
  dnl e.g. if $1 is GST_DEBUG then subsys_def will be a macro with gst-debug
  define([subsys_def],translit([$1], _A-Z, -a-z))

  AC_ARG_ENABLE(subsys_def,
    AC_HELP_STRING(--disable-subsys_def, [disable $2]),
    [
      case "${enableval}" in
        yes) GST_DISABLE_[$1]=no ;;
        no) GST_DISABLE_[$1]=yes ;;
        *) AC_MSG_ERROR([bad value ${enableval} for --enable-subsys_def]) ;;
       esac
    ],
    [GST_DISABLE_[$1]=no]) dnl Default value

  if test x$GST_DISABLE_[$1] = xyes; then
    AC_MSG_NOTICE([disabled subsystem [$2]])
    GST_DISABLE_[$1]_DEFINE="#define GST_DISABLE_$1 1"
  else
    GST_DISABLE_[$1]_DEFINE="/* #undef GST_DISABLE_$1 */"
  fi
  AC_SUBST(GST_DISABLE_[$1]_DEFINE)
  undefine([subsys_def])
])


dnl Parse gstconfig.h for feature and defines add the symbols and substitions
dnl
dnl AG_GST_PARSE_SUBSYSTEM_DISABLE(GST_CONFIGPATH, FEATURE)
dnl
AC_DEFUN([AG_GST_PARSE_SUBSYSTEM_DISABLE],
[
  grep >/dev/null "#undef GST_DISABLE_$2" $1
  if test $? = 0; then
    GST_DISABLE_[$2]=0
  else
    GST_DISABLE_[$2]=1
  fi
  AC_SUBST(GST_DISABLE_[$2])
])

dnl Parse gstconfig.h and defines add the symbols and substitions
dnl
dnl GST_CONFIGPATH=`$PKG_CONFIG --variable=includedir gstreamer-0.10`"/gst/gstconfig.h"
dnl AG_GST_PARSE_SUBSYSTEM_DISABLES(GST_CONFIGPATH)
dnl
AC_DEFUN([AG_GST_PARSE_SUBSYSTEM_DISABLES],
[
  AG_GST_PARSE_SUBSYSTEM_DISABLE($1,GST_DEBUG)
  AG_GST_PARSE_SUBSYSTEM_DISABLE($1,LOADSAVE)
  AG_GST_PARSE_SUBSYSTEM_DISABLE($1,PARSE)
  AG_GST_PARSE_SUBSYSTEM_DISABLE($1,TRACE)
  AG_GST_PARSE_SUBSYSTEM_DISABLE($1,ALLOC_TRACE)
  AG_GST_PARSE_SUBSYSTEM_DISABLE($1,REGISTRY)
  AG_GST_PARSE_SUBSYSTEM_DISABLE($1,PLUGIN)
  AG_GST_PARSE_SUBSYSTEM_DISABLE($1,XML)
])



dnl relies on GST_PLUGINS_ALL, GST_PLUGINS_SELECTED, GST_PLUGINS_YES,
dnl GST_PLUGINS_NO, and BUILD_EXTERNAL
AC_DEFUN([AG_GST_OUTPUT_PLUGINS], [

printf "configure: *** Plug-ins without external dependencies that will be built:\n"
( for i in $GST_PLUGINS_SELECTED; do printf '\t'$i'\n'; done ) | sort
printf "\n"

printf "configure: *** Plug-ins without external dependencies that will NOT be built:\n"
( for i in $GST_PLUGINS_ALL; do
    case " $GST_PLUGINS_SELECTED " in
      *\ $i\ *)
	;;
      *)
	printf '\t'$i'\n'
	;;
    esac
  done ) | sort
printf "\n"

if test "x$BUILD_EXTERNAL" = "xno"; then
  printf "configure: *** No plug-ins with external dependencies will be built\n"
else
  printf "configure: *** Plug-ins with dependencies that will be built:"
  printf "$GST_PLUGINS_YES\n" | sort
  printf "\n"
  printf "configure: *** Plug-ins with dependencies that will NOT be built:"
  printf "$GST_PLUGINS_NO\n" | sort
  printf "\n"
fi
])