From 7b84eeb010e341716fbc994eef3eef989b2b74d2 Mon Sep 17 00:00:00 2001
From: Daniele Varrazzo <daniele.varrazzo@gmail.com>
Date: Sun, 11 Nov 2012 18:30:27 +0000
Subject: [PATCH] Get the program and library version from the META file

---
 bin/Makefile    | 13 +++++++++----
 bin/pg_repack.c | 10 +++++++++-
 lib/Makefile    |  6 ++++++
 lib/repack.c    | 10 +++++++++-
 4 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/bin/Makefile b/bin/Makefile
index 7c3c331..78fc2ff 100644
--- a/bin/Makefile
+++ b/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
diff --git a/bin/pg_repack.c b/bin/pg_repack.c
index c91c3e2..670da4d 100644
--- a/bin/pg_repack.c
+++ b/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>
diff --git a/lib/Makefile b/lib/Makefile
index 804b430..8057319 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -10,12 +10,18 @@ OBJS = repack.o pgut/pgut-be.o pgut/pgut-spi.o
 
 EXTENSION = pg_repack
 
+# 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/')
+
 # The version of the extension, read from the .control file.
 # Note that it doesn't need to be the same of the library version: it should
 # be increased only when the sql changes.
 EXTVER = $(shell grep -e '^default_version' $(EXTENSION).control \
 	| sed -e "s/[^']*'\([^']*\)'.*/\1/")
 
+PG_CPPFLAGS = -DREPACK_VERSION=$(REPACK_VERSION)
+
 #supports both EXTENSION (for >=9.1) and without_EXTENSION (for <PG 9.1)
 DATA_built = pg_repack.sql pg_repack--$(EXTVER).sql
 DATA = pg_repack--1.1.7--1.1.8.sql uninstall_pg_repack.sql
diff --git a/lib/repack.c b/lib/repack.c
index dae6baf..4451153 100644
--- a/lib/repack.c
+++ b/lib/repack.c
@@ -94,11 +94,19 @@ static void RenameRelationInternal(Oid myrelid, const char *newrelname, Oid name
 #define RENAME_REL(relid, newrelname) RenameRelationInternal(relid, newrelname);
 #endif
 
+#ifdef REPACK_VERSION
+/* macro trick to stringify a macro expansion */
+#define xstr(s) str(s)
+#define str(s) #s
+#define LIBRARY_VERSION xstr(REPACK_VERSION)
+#else
+#define LIBRARY_VERSION "unknown"
+#endif
 
 Datum
 repack_version(PG_FUNCTION_ARGS)
 {
-	return CStringGetTextDatum("pg_repack 1.1.6");
+	return CStringGetTextDatum("pg_repack " LIBRARY_VERSION);
 }
 
 /**