From 894f9bb1c44926716449ddd1aefb795e014fa323 Mon Sep 17 00:00:00 2001
From: Vitaly Davydov <v.davydov@postgrespro.ru>
Date: Tue, 27 Jun 2023 12:07:28 +0300
Subject: [PATCH] [ISSUE-10] Implemented propagation of pg sphere version.

---
 Makefile          |  3 +++
 expected/init.out |  6 ++++++
 sql/init.sql      |  2 ++
 src/output.c      | 14 +++++++++++---
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index bc82eb4..a98cccd 100644
--- a/Makefile
+++ b/Makefile
@@ -32,6 +32,9 @@ TESTS       = init_test tables points euler circle line ellipse poly path box in
 			  contains_ops contains_ops_compat bounding_box_gist gnomo healpix \
 			  moc mocautocast epochprop
 
+PG_CFLAGS	+= -DPGSPHERE_VERSION=$(PGSPHERE_VERSION)
+PG_CPPFLAGS	+= -DPGSPHERE_VERSION=$(PGSPHERE_VERSION)
+
 ifndef CXXFLAGS
 # no support for CXXFLAGS in PGXS before v11
 CXXFLAGS = -Wall -Wpointer-arith -Wendif-labels \
diff --git a/expected/init.out b/expected/init.out
index 0af7764..375eeaf 100644
--- a/expected/init.out
+++ b/expected/init.out
@@ -3,3 +3,9 @@
 -- does not depend on contents of pg_sphere.sql.
 --
 CREATE EXTENSION pg_sphere;
+select pg_sphere_version();
+ pg_sphere_version 
+-------------------
+ 1.2.1
+(1 row)
+
diff --git a/sql/init.sql b/sql/init.sql
index 0af7764..05b3516 100644
--- a/sql/init.sql
+++ b/sql/init.sql
@@ -3,3 +3,5 @@
 -- does not depend on contents of pg_sphere.sql.
 --
 CREATE EXTENSION pg_sphere;
+
+select pg_sphere_version();
diff --git a/src/output.c b/src/output.c
index 865e458..60e7464 100644
--- a/src/output.c
+++ b/src/output.c
@@ -1,5 +1,12 @@
 #include "types.h"
 
+#if !defined(PGSPHERE_VERSION)
+#error "PGSPHERE_VERSION macro is not set"
+#endif
+
+#define PGSPHERE_STRINGIFY_INTERNAL(x) #x
+#define PGSPHERE_STRINGIFY(x) PGSPHERE_STRINGIFY_INTERNAL(x)
+
 /* Output functions */
 
 
@@ -527,7 +534,8 @@ spherebox_out(PG_FUNCTION_ARGS)
 Datum
 pg_sphere_version(PG_FUNCTION_ARGS)
 {
-	char	   *buffer = (char *) palloc(20);
-	sprintf(buffer, "1.1.5");
-	PG_RETURN_CSTRING(buffer);
+	const char	*s = PGSPHERE_STRINGIFY(PGSPHERE_VERSION);
+	char		*p = (char *)palloc(strlen(s) + 1);
+	strcpy(p, s);
+	PG_RETURN_CSTRING(p);
 }