Add version info from git-describe

A new script, gen-version.sh, is now invoked from 'make version' to generate
the file VERSION. This file contains a version identifier generated by
git-describe and is included in the Makefile.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

.gitignore

@@ -1,4 +1,5 @@
 # Files I don't care to see in git-status/commit
 cgit
+VERSION
 *.o
 *~

Makefile

@@ -1,7 +1,4 @@
-CGIT_VERSION = 0.5
-
 prefix = /var/www/htdocs/cgit
-
 SHA1_HEADER = <openssl/sha.h>
 CACHE_ROOT = /var/cache/cgit
 CGIT_CONFIG = /etc/cgitrc
@@ -12,6 +9,17 @@ CGIT_SCRIPT_NAME = cgit.cgi
 #
 -include cgit.conf
 
+
+CGIT_VERSION = 0.5
+
+all: cgit
+
+VERSION:
+	gen-version.sh
+
+-include VERSION
+
+
 EXTLIBS = git/libgit.a git/xdiff/lib.a -lz -lcrypto
 OBJECTS = shared.o cache.o parsing.o html.o ui-shared.o ui-repolist.o \
 	ui-summary.o ui-log.o ui-tree.o ui-commit.o ui-diff.o \
@@ -42,12 +50,7 @@ INITGIT = ./submodules.sh -i
 endif
 
 
-#
-# basic build rules
-#
-all: cgit
-
-cgit: cgit.c cgit.h $(OBJECTS)
+cgit: cgit.c cgit.h VERSION $(OBJECTS)
 	$(CC) $(CFLAGS) cgit.c -o cgit $(OBJECTS) $(EXTLIBS)
 
 $(OBJECTS): cgit.h git/libgit.a
@@ -65,7 +68,7 @@ install: all clean-cache
 	install cgit.css $(prefix)/cgit.css
 
 clean-cgit:
-	rm -f cgit *.o
+	rm -f cgit VERSION *.o
 
 distclean-cgit: clean-cgit
 	git clean -d -x
@@ -83,5 +86,9 @@ clean: clean-cgit clean-sub
 
 distclean: distclean-cgit distclean-sub
 
+version: clean-cgit
+	./gen-version.sh
+	make
+
 .PHONY: all install clean clean-cgit clean-sub clean-cache \
-	distclean distclean-cgit distclean-sub
+	distclean distclean-cgit distclean-sub release version

cgit.c

@@ -8,9 +8,6 @@
 
 #include "cgit.h"
 
-const char cgit_version[] = CGIT_VERSION;
-
-
 static int cgit_prepare_cache(struct cacheitem *item)
 {
 	if (!cgit_repo && cgit_query_repo) {

cgit.h

@@ -98,7 +98,7 @@ struct taginfo {
 	char *msg;
 };
 
-extern const char cgit_version[];
+extern const char *cgit_version;
 
 extern struct repolist cgit_repolist;
 extern struct repoinfo *cgit_repo;

gen-version.sh

@@ -0,0 +1,4 @@
+v=$(git-describe --abbrev=4 HEAD | sed -e 's/-/./g')
+test -z "$v" && exit 1
+echo "CGIT_VERSION = $v"
+echo "CGIT_VERSION = $v" > VERSION

shared.c

@@ -12,6 +12,8 @@ struct repolist cgit_repolist;
 struct repoinfo *cgit_repo;
 int cgit_cmd;
 
+const char *cgit_version = CGIT_VERSION;
+
 char *cgit_root_title   = "Git repository browser";
 char *cgit_css          = "/cgit.css";
 char *cgit_logo         = "/git-logo.png";

ui-shared.c

@@ -262,7 +262,7 @@ void cgit_print_docstart(char *title, struct cacheitem *item)
 	html("<title>");
 	html_txt(title);
 	html("</title>\n");
-	htmlf("<meta name='generator' content='cgit v%s'/>\n", cgit_version);
+	htmlf("<meta name='generator' content='cgit %s'/>\n", cgit_version);
 	html("<link rel='stylesheet' type='text/css' href='");
 	html_attr(cgit_css);
 	html("'/>\n");