[API] Add version macros and functions

Step version up to 0.5.0.

Also, fix to pass "make distcheck"

src/Makefile.am

diff --git a/src/Makefile.am b/src/Makefile.am
index 0a7edb3..73ac547 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,6 +2,9 @@
 
 NULL =
 EXTRA_DIST =
+CLEANFILES =
+DISTCLEANFILES =
+MAINTAINERCLEANFILES =
 
 # The following warning options are useful for debugging: -Wpadded -Wcast-align
 #AM_CXXFLAGS =
@@ -35,6 +38,7 @@
 	hb-font.h \
 	hb-shape.h \
 	hb-unicode.h \
+	hb-version.h \
 	$(NULL)
 
 HBSOURCES += \
@@ -61,6 +65,10 @@
 	hb-ot-tag.h \
 	$(NULL)
 
+MAINTAINERCLEANFILES = \
+	$(srcdir)/hb-version.h \
+	$(NULL)
+
 if HAVE_GLIB
 HBCFLAGS += $(GLIB_CFLAGS)
 HBLIBS   += $(GLIB_LIBS)
@@ -99,6 +107,7 @@
 libharfbuzz_la_CPPFLAGS = $(HBCFLAGS)
 libharfbuzz_la_LIBADD = $(HBLIBS)
 pkginclude_HEADERS = $(HBHEADERS)
+nodist_pkginclude_HEADERS = hb-version.h
 
 
 GENERATORS = \

src/check-c-linkage-decls.sh

diff --git a/src/check-c-linkage-decls.sh b/src/check-c-linkage-decls.sh
index 711d089..ffdb9e3 100755
--- a/src/check-c-linkage-decls.sh
+++ b/src/check-c-linkage-decls.sh
@@ -8,7 +8,7 @@
 
 cd "$srcdir"
 
-for x in hb-*.c hb-*.cc hb-*.h hb-*.hh ; do
+for x in hb-*.cc hb-*.h hb-*.hh ; do
 	if ! grep -q HB_BEGIN_DECLS "$x" || ! grep -q HB_END_DECLS "$x"; then
 		echo "Ouch, file $x does not HB_BEGIN_DECLS / HB_END_DECLS"
 		stat=1

src/hb-common.cc

diff --git a/src/hb-common.cc b/src/hb-common.cc
index b000340..49f3eb8 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -28,6 +28,8 @@
 
 #include "hb-private.hh"
 
+#include "hb-version.h"
+
 #include "hb-mutex-private.hh"
 #include "hb-object-private.hh"
 
@@ -308,4 +310,31 @@
 }
 
 
+/* hb_version */
+
+void
+hb_version (unsigned int *major,
+	    unsigned int *minor,
+	    unsigned int *micro)
+{
+  *major = HB_VERSION_MAJOR;
+  *minor = HB_VERSION_MINOR;
+  *micro = HB_VERSION_MICRO;
+}
+
+const char *
+hb_version_string (void)
+{
+  return HB_VERSION_STRING;
+}
+
+hb_bool_t
+hb_version_check (unsigned int major,
+		  unsigned int minor,
+		  unsigned int micro)
+{
+  return HB_VERSION_CHECK (major, minor, micro);
+}
+
+
 HB_END_DECLS

src/hb-version.h.in

diff --git a/src/hb-version.h.in b/src/hb-version.h.in
new file mode 100644
index 0000000..47a9b30
--- /dev/null
+++ b/src/hb-version.h.in
@@ -0,0 +1,62 @@
+/*
+ * Copyright © 2011  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_VERSION_H
+#define HB_VERSION_H
+
+#include "hb-common.h"
+
+HB_BEGIN_DECLS
+
+
+#define HB_VERSION_MAJOR @HB_VERSION_MAJOR@
+#define HB_VERSION_MINOR @HB_VERSION_MINOR@
+#define HB_VERSION_MICRO @HB_VERSION_MICRO@
+
+#define HB_VERSION_STRING "@HB_VERSION@"
+
+#define HB_VERSION_CHECK(major,minor,micro) \
+	((major)*10000+(minor)*100+(micro) >= \
+	 HB_VERSION_MAJOR*10000+HB_VERSION_MINOR*100+HB_VERSION_MICRO)
+
+
+void
+hb_version (unsigned int *major,
+	    unsigned int *minor,
+	    unsigned int *micro);
+
+const char *
+hb_version_string (void);
+
+hb_bool_t
+hb_version_check (unsigned int major,
+		  unsigned int minor,
+		  unsigned int micro);
+
+
+HB_END_DECLS
+
+#endif /* HB_VERSION_H */

src/hb.h

diff --git a/src/hb.h b/src/hb.h
index b75998e..0a2ebd9 100644
--- a/src/hb.h
+++ b/src/hb.h
@@ -33,6 +33,7 @@
 #include "hb-font.h"
 #include "hb-shape.h"
 #include "hb-unicode.h"
+#include "hb-version.h"
 
 HB_BEGIN_DECLS
 HB_END_DECLS