From d779db6715c4bb1025963e059d1cbfde7aecaa74 Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik@fiktivkod.org>
Date: Thu, 22 Aug 2013 10:01:54 +0200
Subject: [PATCH] Adding version generation script for Makefile.

---
 .gitignore  |  1 +
 Makefile    | 17 ++++++++++++++++-
 VERSION-GEN | 18 ++++++++++++++++++
 3 files changed, 35 insertions(+), 1 deletion(-)
 create mode 100644 VERSION-GEN

diff --git a/.gitignore b/.gitignore
index 32e01ec..2251108 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 .*
 *.o
+VERSION_FILE
 dlight
 dlight-*
 config
diff --git a/Makefile b/Makefile
index 958c853..6a1bcd4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,10 @@
 
+all::
+
+VERSION_FILE : FORCE
+	@$(SHELL) VERSION-GEN $@
+-include VERSION_FILE
+
 CC = gcc
 LDFLAGS = -lxml2 -lcurl -lpcre
 CFLAGS = -g -Wall -I/usr/include/libxml2
@@ -9,7 +15,7 @@ ifeq ($(DEBUG), 1)
 	CFLAGS +=-D__DEBUG__
 endif
 
-all : $(PROGRAMS)
+all:: $(PROGRAMS)
 
 install : $(PROGRAMS)
 	cp $^ $(HOME)/bin/
@@ -24,5 +30,14 @@ dlight-filter-check: filter-check.o filter.o error.o version.o
 dlight-% : %.o
 	$(CC) $(LDFLAGS) -o $@ $^
 
+version.o : VERSION_FILE FORCE
+version.o : EXTRA_CFLAGS = -DDLIGHT_VERSION=\"$(VERSION)\"
+
+%.o : %.c
+	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
+
 clean :
 	$(RM) *.o $(PROGRAMS)
+	$(RM) VERSION_FILE
+
+FORCE:
diff --git a/VERSION-GEN b/VERSION-GEN
new file mode 100644
index 0000000..6f3e731
--- /dev/null
+++ b/VERSION-GEN
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+VERSION=$(git describe --always --tags --match "v[0-9]*" HEAD 2>/dev/null)
+
+if [ -n "$(git status --porcelain)" ]; then
+    VERSION="${VERSION}-dirty"
+fi
+
+if [ -f "${1}" ]; then
+    OLD=$(cat ${1} | sed 's/VERSION = //')
+else
+    OLD=unset
+fi
+
+if [ "${VERSION}" != "${OLD}" ]; then
+    #echo >&2 "VERSION = ${VERSION}"
+    echo "VERSION = ${VERSION}" > ${1}
+fi