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import subprocess, os, datetime, re, os.path

def getGitBuildVersion(root, project) :
	tag = git("describe --tags --exact --match \"" + project + "-*\"", root)
	if tag :
		return tag.rstrip()[len(project)+1:]
	tag = git("describe --tags --match \"" + project + "-*\"", root)
	if tag :
		m = re.match(project + "-(.*)-(.*)-(.*)", tag)
		if m :
			return m.group(1) + "-dev" + m.group(2)
	return None

def git(cmd, root) :
	full_cmd = "git " + cmd
	p = subprocess.Popen(full_cmd, cwd=root, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=(os.name != "nt"))
	gitVersion = p.stdout.read()
	# error = p.stderr.read()
	# if error:
	#   print "Git error: " + error
	p.stdin.close()
	if p.wait() == 0 :
		return gitVersion
	return None

def getBuildVersion(root, project) :
	versionFilename = os.path.join(root, "VERSION." + project)
	if os.path.isfile(versionFilename) :
		f = open(versionFilename)
		version = f.read().strip()
		f.close()
		return version

	gitVersion = getGitBuildVersion(root, project)
	if gitVersion :
		return gitVersion

	return datetime.date.today().strftime("%Y%m%d")

def convertToWindowsVersion(version) :
	version_match = re.match("(\d+)\.(\d+)(.*)", version)
	major = version_match and int(version_match.group(1)) or 0
	minor = version_match and int(version_match.group(2)) or 0
	if version_match and len(version_match.group(3)) == 0 :
		patch = 60000
	else :
		match = re.match("^beta(\d+)(.*)", version_match.group(3))
		build_string = ""
		if match :
			patch = 1000*int(match.group(1))
			build_string = match.group(2)
		else :
			rc_match = re.match("^rc(\d+)(.*)", version_match.group(3))
			if rc_match :
				patch = 10000*int(rc_match.group(1))
				build_string = rc_match.group(2)
			else :
				patch = 0
				alpha_match = re.match("^alpha(.*)", version_match.group(3))
				if alpha_match :
					build_string = alpha_match.group(1)

		if len(build_string) > 0 :
			build_match = re.match("^-dev(\d+)", build_string)
			if build_match :
				patch += int(build_match.group(1))

	return (major, minor, patch)