From cf92d0c21b33ab2885e4fa873ee5b437239834ee Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Thu, 2 Jan 2014 12:49:10 +0100
Subject: write version to header file

---
 .gitignore  |  3 ++-
 Makefile    | 15 ++++++++-------
 nullshell.c |  1 +
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/.gitignore b/.gitignore
index a0b9981..32c39d5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
-nullshell
 config.h
+nullshell
 README.html
+version.h
diff --git a/Makefile b/Makefile
index 03ae732..e50dfe9 100644
--- a/Makefile
+++ b/Makefile
@@ -7,18 +7,19 @@ MD	:= markdown
 INSTALL	:= install
 RM	:= rm
 CFLAGS	+= -O2 -Wall -Werror
-VERSION := $(shell git describe --tags --long 2>/dev/null)
 # this is just a fallback in case you do not use git but downloaded
 # a release tarball...
-ifeq ($(VERSION),)
 VERSION := 0.0.2
-endif
 
 all: nullshell README.html
 
-nullshell: nullshell.c config.h
-	$(CC) $(CFLAGS) $(LDFLAGS) nullshell.c -o nullshell \
-		-DVERSION="\"$(VERSION)\""
+nullshell: nullshell.c config.h version.h
+	$(CC) $(CFLAGS) $(LDFLAGS) nullshell.c -o nullshell
+
+version.h: $(wildcard .git/HEAD .git/index .git/refs/tags/*) Makefile
+	echo "#ifndef VERSION" > $@
+	echo "#define VERSION \"$(shell git describe --tags --long 2>/dev/null || echo ${VERSION})\"" >> $@
+	echo "#endif" >> $@
 
 config.h:
 	$(CP) config.def.h config.h
@@ -36,4 +37,4 @@ install-doc: README.html
 	$(INSTALL) -D -m0755 README.html $(DESTDIR)$(PREFIX)/share/doc/nullshell/README.html
 
 clean:
-	$(RM) -f README.html nullshell
+	$(RM) -f README.html nullshell version.h
diff --git a/nullshell.c b/nullshell.c
index 7986cbf..52a5a81 100644
--- a/nullshell.c
+++ b/nullshell.c
@@ -14,6 +14,7 @@
 #include <unistd.h>
 
 #include "config.h"
+#include "version.h"
 
 int main(int argc, char **argv) {
 	time_t now;
-- 
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