Get the program and library version from the META file

bin/Makefile

@@ -12,11 +12,16 @@ REGRESS = init repack
 
 EXTRA_CLEAN = sql/init-$(MAJORVERSION).sql sql/init.sql
 
-ifdef DEBUG_REORG
-PG_CPPFLAGS = -I$(libpq_srcdir) -DDEBUG_REORG
-else
-PG_CPPFLAGS = -I$(libpq_srcdir)
+# The version number of the program. It should be the same of the library.
+REPACK_VERSION = $(shell grep '"version":' ../META.json | head -1 \
+	| sed -e 's/\s*"version":\s*"\(.*\)",/\1/')
+
+PG_CPPFLAGS = -I$(libpq_srcdir) -DREPACK_VERSION=$(REPACK_VERSION)
+
+ifdef DEBUG_REPACK
+PG_CPPFLAGS += -DDEBUG_REPACK
 endif
+
 PG_LIBS = $(libpq)
 
 USE_PGXS = 1	# use pgxs if not in contrib directory

bin/pg_repack.c

@@ -10,10 +10,18 @@
  * @brief Client Modules
  */
 
-const char *PROGRAM_VERSION	= "1.1.7";
 const char *PROGRAM_URL		= "https://github.com/reorg/pg_reorg";
 const char *PROGRAM_EMAIL	= "reorg-general@lists.pgfoundry.org";
 
+#ifdef REPACK_VERSION
+/* macro trick to stringify a macro expansion */
+#define xstr(s) str(s)
+#define str(s) #s
+const char *PROGRAM_VERSION = xstr(REPACK_VERSION);
+#else
+const char *PROGRAM_VERSION = "unknown";
+#endif
+
 #include "pgut/pgut-fe.h"
 
 #include <string.h>