[nautilus] tracker: make the tracker-sparql dependency optional

[Cosimo Cecchi <cosimoc src gnome org>]

commit ffc7c7f98901e8a319b91716d05e521a798dbe43
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Wed Sep 7 18:42:25 2011 -0400

    tracker: make the tracker-sparql dependency optional
    
    This way it's still possible to specify --enable-tracker=no from the
    configure line if you want to avoid the tracker dependency.

 configure.in                                 |   23 +++++++++++++++++++++++
 libnautilus-private/Makefile.am              |    9 +++++++--
 libnautilus-private/nautilus-search-engine.c |    5 +++++
 3 files changed, 35 insertions(+), 2 deletions(-)
---
diff --git a/configure.in b/configure.in
index 43baf71..d835684 100644
--- a/configure.in
+++ b/configure.in
@@ -268,6 +268,28 @@ AC_TRY_RUN([#include <time.h>
 	    AC_DEFINE(HAVE_STRFTIME_EXTENSION, 1, [Define if strftime supports %E and %O modifiers.])
             )
 
+dnl ===========================================================================
+dnl Check for Tracker
+dnl ===========================================================================
+
+AC_ARG_ENABLE(tracker,
+              [AS_HELP_STRING([--enable-tracker=@<:@yes/no/auto@:>@],
+                              [build Tracker builtin support [default=auto]])],
+              [enable_tracker="$enableval"],
+              [enable_tracker=auto])
+if test "$enable_tracker" = "auto"; then
+  enable_tracker=yes
+fi
+
+build_tracker=no
+if test "x$enable_tracker" != "xno"; then
+  PKG_CHECK_MODULES(TRACKER, tracker-sparql-0.12, [
+                             build_tracker=yes
+                             AC_DEFINE(ENABLE_TRACKER, 1, [Define to enable Tracker support])])
+fi
+
+AM_CONDITIONAL(ENABLE_TRACKER, test "x$build_tracker" = "xyes")
+
 dnl ==========================================================================
 	
 dnl base libs
@@ -361,6 +383,7 @@ nautilus-$VERSION:
 	libexempi support:	$msg_xmp
 	PackageKit support:     $msg_packagekit
 	nautilus-sendto ext:	$enable_nst_extension
+	Tracker support:	$build_tracker
 
 	profiling support:      ${profiling_support}
         debugging support:      ${enable_debug}
diff --git a/libnautilus-private/Makefile.am b/libnautilus-private/Makefile.am
index 4885ab3..e41118f 100644
--- a/libnautilus-private/Makefile.am
+++ b/libnautilus-private/Makefile.am
@@ -32,6 +32,12 @@ BUILT_SOURCES = \
 	$(dbus_built_sources) \
 	$(NULL)
 
+if ENABLE_TRACKER
+nautilus_tracker_engine_sources = \
+	nautilus-search-engine-tracker.c \
+	nautilus-search-engine-tracker.h
+endif
+
 dependency_static_libs = \
 	$(top_builddir)/cut-n-paste-code/libegg/libegg.la \
 	$(NULL)
@@ -157,8 +163,6 @@ libnautilus_private_la_SOURCES = \
 	nautilus-search-engine.h \
 	nautilus-search-engine-simple.c \
 	nautilus-search-engine-simple.h \
-	nautilus-search-engine-tracker.c \
-	nautilus-search-engine-tracker.h \
 	nautilus-selection-canvas-item.c \
 	nautilus-selection-canvas-item.h \
 	nautilus-signaller.h \
@@ -188,6 +192,7 @@ libnautilus_private_la_SOURCES = \
 	nautilus-vfs-directory.h \
 	nautilus-vfs-file.c \
 	nautilus-vfs-file.h \
+	$(nautilus_tracker_engine_sources) \
 	$(NULL)
 
 nodist_libnautilus_private_la_SOURCES =\
diff --git a/libnautilus-private/nautilus-search-engine.c b/libnautilus-private/nautilus-search-engine.c
index 0274646..e4952d2 100644
--- a/libnautilus-private/nautilus-search-engine.c
+++ b/libnautilus-private/nautilus-search-engine.c
@@ -24,7 +24,10 @@
 #include <config.h>
 #include "nautilus-search-engine.h"
 #include "nautilus-search-engine-simple.h"
+
+#ifdef ENABLE_TRACKER
 #include "nautilus-search-engine-tracker.h"
+#endif
 
 #include <eel/eel-gtk-macros.h>
 
@@ -125,10 +128,12 @@ nautilus_search_engine_new (void)
 {
 	NautilusSearchEngine *engine;
 	
+#ifdef ENABLE_TRACKER	
 	engine = nautilus_search_engine_tracker_new ();
 	if (engine) {
 		return engine;
 	}
+#endif
 	
 	engine = nautilus_search_engine_simple_new ();
 	return engine;