# mkversion.mk
#
# Determine the repository checkout id.  Assume that there are no local
# changes in the workspace.  Support svn, git svn, and git.
#
# Usage example:
#
# VERSION_FILE := "version.h"
# $(VERSION_FILE):%.h: %.in
#	sed -e 's|__appVersion__|$(VERSION)|g' < $^ > $@
#
# Contents of version.h:
#
# #ifndef VERSION_H
# #define VERSION_H
#
# #define VERSION	"__appVersion__"
#
# #endif

ifeq (.svn,$(shell ls -d .svn 2>/dev/null))
    VERSION := $(shell svnversion . 2>/dev/null | sed -e 's|M$$|-dirty|')
    ifneq (,$(VERSION))
	VERSION := r$(VERSION)
    endif
    VERFROM := svn
endif
ifeq (.git,$(shell ls -d .git))
    VERSION := $(shell git svn info 2>/dev/null | grep "Revision: " | \
	    sed -e s'/^[^0-9]*\([0-9]*\).*$$/r\1/')
    ifneq (,$(VERSION))
	# git-svn
	ifeq (,$(shell git log -n1 2>/dev/null | grep "git-svn-id: "))
	    VERSION := $(VERSION)-dirty
	else
	    ifneq (,$(shell git diff-index --name-only HEAD 2>/dev/null))
		VERSION := $(VERSION)-dirty
	    endif
	endif
	VERFROM := svn
    else
	# git
	VERSION := $(shell git describe --tags --always 2>/dev/null)
	ifneq (,$(VERSION))
	    ifneq (,$(shell git diff-index --name-only HEAD 2>/dev/null))
		VERSION := $(VERSION)-dirty
	    endif
	endif
	VERFROM := git
    endif
endif
ifeq (,$(VERSION))
    VERSION := unknown
endif
#$(warning VERSION $(VERSION))