added increment ('+', '++', '+++') and equalise ('=')

.gitignore

@@ -0,0 +1,2 @@
+0inst
+*.pyc

VERSION

@@ -1 +1 @@
-0.1
+0.2

version.py

@@ -0,0 +1,142 @@
+#!/usr/bin/env python
+
+import sys, os
+import re
+import traceback
+VERBOSE=False
+
+def version_file(val=None):
+	v = "VERSION"
+	if os.path.exists(v):
+		if val is None:
+			with open(v) as f:
+				return f.read().strip()
+		else:
+			with open(v, 'w') as f:
+				f.write(val)
+			return True
+version_file.desc = "VERSION"
+
+def setup_py(val=None):
+	s = "setup.py"
+	if os.path.exists(s):
+		version_re = re.compile("""(?P<pre>version\s*=\s*['"])(?P<version>[^'"]*)""")
+		with open(s) as f:
+			lines = f.read()
+			lines = open(s).read()
+		if val is None:
+			return re.search(version_re, lines).group('version')
+		else:
+			with open(s, 'w') as f:
+				f.write(re.sub(version_re, r"\g<pre>%s" % (val,), lines, 1))
+			return True
+setup_py.desc = "setup.py"
+
+version_strategies = [setup_py, version_file]
+def version_types(*a):
+	def do(strategy):
+		try:
+			return strategy(*a)
+		except StandardError, e:
+			print >> sys.stderr, "[ error: %s  (%s)]" % (e,strategy.desc)
+			if VERBOSE:
+				traceback.print_exc(file=sys.stderr)
+	results = [Version(do(s), desc=s.desc) for s in version_strategies]
+	return [r for r in results if r]
+
+class Version(object):
+	def __init__(self, number, desc=None):
+		self.number = number
+		self.desc = desc
+
+	def increment(self, levels):
+		before, middle, after = split(self.number, levels)
+		middle = int(middle) + 1
+		after = [0 for part in after]
+		all_parts = ".".join(map(str, before + [middle] + after))
+		return Version(all_parts)
+
+	def __str__(self):
+		return "%-8s (%s)" % (self.desc, self.number)
+
+	def __repr__(self):
+		return "Version(%r)" % (self.number,)
+
+	def __nonzero__(self):
+		return self.number is not None
+
+def main(args):
+	if len(args) > 1 or '--help' in args:
+		print >> sys.stderr, "Usage: %s [version]" % (os.path.basename(sys.argv[0]),)
+		sys.exit(1)
+	versions = version_types()
+	print "\n".join(map(str, versions))
+	if len(args) == 1:
+		new_version = get_version(args[0], versions)
+		ok = raw_input("\nchange version to %s? " % (new_version.number,)).strip().lower() in ('y','yes','')
+		if not ok:
+			sys.exit(0)
+		changed = version_types(new_version.number)
+		print "changed version in %s files." % (len(changed),)
+
+def get_version(input, current_versions):
+	"""
+	>>> get_version('1234', [])
+	Version('1234')
+	>>> get_version('+', [Version('0.1.2')])
+	Version('0.1.3')
+	>>> get_version('+', [Version('0.1.9')])
+	Version('0.1.10')
+	>>> get_version('+', [Version('0.1')])
+	Version('0.2')
+
+	>>> get_version('++', [Version('0.1.2')])
+	Version('0.2.0')
+	>>> get_version('++', [Version('0.1')])
+	Version('1.0')
+
+	"""
+	if all([char == '+' for char in input]):
+		return current_versions[0].increment(len(input))
+
+	elif input == '=':
+		return current_versions[0]
+	else:
+		return Version(input)
+
+def split(version, idx):
+	"""splits a version at idx from the lest-significant portion (starting at 1):
+
+	>>> split('0.1.2', 1)
+	(['0', '1'], '2', [])
+	>>> split('0.1.2', 2)
+	(['0'], '1', ['2'])
+	>>> split('0.1.2', 3)
+	([], '0', ['1', '2'])
+
+	>>> split('0.1', 1)
+	(['0'], '1', [])
+	>>> split('0.1', 2)
+	([], '0', ['1'])
+
+	>>> split('0.1', 3)
+	([], '0', ['1'])
+	"""
+	parts = version.split(".")
+	middle = max(0, len(parts) - idx)
+	more_significant = parts[:middle]
+	less_significant = parts[middle+1:]
+	return (more_significant, parts[middle], less_significant)
+
+if __name__ == '__main__':
+	sys_argv = sys.argv[1:]
+	argv = [arg for arg in sys_argv if arg not in ('-v',)]
+	if '-v' in sys_argv:
+		VERBOSE=True
+	try:
+		main(argv)
+	except StandardError, e:
+		print >> sys.stderr, e
+		if VERBOSE: raise
+	except (KeyboardInterrupt, EOFError):
+		print ""

version.xml

@@ -5,11 +5,6 @@
   <summary>view (and modify) your project version in multiple commonly-used places</summary>
   <description>
   </description>
-  <group main="version">
-		<implementation id="sha1new=fd922b49210b8a26f2db866640a29c76cd208efb" released="2010-07-24" version="0.1">
-
-    <manifest-digest sha256="3e98d76fc60324eeae6eca480270595e59c32fa00a1b6d409de316f0fb2f46f5"/>
-    <archive href="http://gfxmonk.net/dist/0install/version/version-0.1.tgz" size="961"/>
-  </implementation>
+  <group main="version.py">
   </group>
 </interface>