Adding version generation script for Makefile.

.gitignore

@@ -1,5 +1,6 @@
 .*
 *.o
+VERSION_FILE
 dlight
 dlight-*
 config

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:

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