
# This file helps to compute a version number in source trees obtained from
# git-archive tarball (such as those provided by githubs download-from-tag
# feature). Distribution tarballs (built by setup.py sdist) and build
# directories (produced by setup.py build) will contain a much shorter file
# that just contains the computed version number.

# This file is released into the public domain. Generated by
# versioneer-0.15 (https://github.com/warner/python-versioneer)

import errno
import os
import re
import subprocess
import sys


def get_keywords():
	# these strings will be replaced by git during git-archive.
	# setup.py/versioneer.py will grep for the variable names, so they must
	# each be defined on a line of their own. _version.py will just call
	# get_keywords().
	git_refnames = "$Format:%d$"
	git_full = "$Format:%H$"
	keywords = {"refnames": git_refnames, "full": git_full}
	return keywords


class VersioneerConfig:
	pass


def get_config():
	# these strings are filled in when 'setup.py versioneer' creates
	# _version.py
	cfg = VersioneerConfig()
	cfg.VCS = "git"
	cfg.style = "pep440"
	cfg.tag_prefix = "v"
	cfg.parentdir_prefix = "pleiades-"
	cfg.versionfile_source = "pleiades/_version.py"
	cfg.verbose = False
	return cfg


class NotThisMethod(Exception):
	pass


LONG_VERSION_PY = {}
HANDLERS = {}


def register_vcs_handler(vcs, method):  # decorator
	def decorate(f):
		if vcs not in HANDLERS:
			HANDLERS[vcs] = {}
		HANDLERS[vcs][method] = f
		return f
	return decorate


def run_command(commands, args, cwd=None, verbose=False, hide_stderr=False):
	assert isinstance(commands, list)
	p = None
	for c in commands:
		try:
			dispcmd = str([c] + args)
			# remember shell=False, so use git.cmd on windows, not just git
			p = subprocess.Popen([c] + args, cwd=cwd, stdout=subprocess.PIPE,
								 stderr=(subprocess.PIPE if hide_stderr
										 else None))
			break
		except EnvironmentError:
			e = sys.exc_info()[1]
			if e.errno == errno.ENOENT:
				continue
			if verbose:
				print("unable to run %s" % dispcmd)
				print(e)
			return None
	else:
		if verbose:
			print("unable to find command, tried %s" % (commands,))
		return None
	stdout = p.communicate()[0].strip()
	if sys.version_info[0] >= 3:
		stdout = stdout.decode()
	if p.returncode != 0:
		if verbose:
			print("unable to run %s (error)" % dispcmd)
		return None
	return stdout


def versions_from_parentdir(parentdir_prefix, root, verbose):
	# Source tarballs conventionally unpack into a directory that includes
	# both the project name and a version string.
	dirname = os.path.basename(root)
	if not dirname.startswith(parentdir_prefix):
		if verbose:
			print("guessing rootdir is '%s', but '%s' doesn't start with "
				  "prefix '%s'" % (root, dirname, parentdir_prefix))
		raise NotThisMethod("rootdir doesn't start with parentdir_prefix")
	return {"version": dirname[len(parentdir_prefix):],
			"full-revisionid": None,
			"dirty": False, "error": None}


@register_vcs_handler("git", "get_keywords")
def git_get_keywords(versionfile_abs):
	# the code embedded in _version.py can just fetch the value of these
	# keywords. When used from setup.py, we don't want to import _version.py,
	# so we do it with a regexp instead. This function is not used from
	# _version.py.
	keywords = {}
	try:
		f = open(versionfile_abs, "r")
		for line in f.readlines():
			if line.strip().startswith("git_refnames ="):
				mo = re.search(r'=\s*"(.*)"', line)
				if mo:
					keywords["refnames"] = mo.group(1)
			if line.strip().startswith("git_full ="):
				mo = re.search(r'=\s*"(.*)"', line)
				if mo:
					keywords["full"] = mo.group(1)
		f.close()
	except EnvironmentError:
		pass
	return keywords


@register_vcs_handler("git", "keywords")
def git_versions_from_keywords(keywords, tag_prefix, verbose):
	if not keywords:
		raise NotThisMethod("no keywords at all, weird")
	refnames = keywords["refnames"].strip()
	if refnames.startswith("$Format"):
		if verbose:
			print("keywords are unexpanded, not using")
		raise NotThisMethod("unexpanded keywords, not a git-archive tarball")
	refs = set([r.strip() for r in refnames.strip("()").split(",")])
	# starting in git-1.8.3, tags are listed as "tag: foo-1.0" instead of
	# just "foo-1.0". If we see a "tag: " prefix, prefer those.
	TAG = "tag: "
	tags = set([r[len(TAG):] for r in refs if r.startswith(TAG)])
	if not tags:
		# Either we're using git < 1.8.3, or there really are no tags. We use
		# a heuristic: assume all version tags have a digit. The old git %d
		# expansion behaves like git log --decorate=short and strips out the
		# refs/heads/ and refs/tags/ prefixes that would let us distinguish
		# between branches and tags. By ignoring refnames without digits, we
		# filter out many common branch names like "release" and
		# "stabilization", as well as "HEAD" and "master".
		tags = set([r for r in refs if re.search(r'\d', r)])
		if verbose:
			print("discarding '%s', no digits" % ",".join(refs-tags))
	if verbose:
		print("likely tags: %s" % ",".join(sorted(tags)))
	for ref in sorted(tags):
		# sorting will prefer e.g. "2.0" over "2.0rc1"
		if ref.startswith(tag_prefix):
			r = ref[len(tag_prefix):]
			if verbose:
				print("picking %s" % r)
			return {"version": r,
					"full-revisionid": keywords["full"].strip(),
					"dirty": False, "error": None
					}
	# no suitable tags, so version is "0+unknown", but full hex is still there
	if verbose:
		print("no suitable tags, using unknown + full revision id")
	return {"version": "0+unknown",
			"full-revisionid": keywords["full"].strip(),
			"dirty": False, "error": "no suitable tags"}


@register_vcs_handler("git", "pieces_from_vcs")
def git_pieces_from_vcs(tag_prefix, root, verbose, run_command=run_command):
	# this runs 'git' from the root of the source tree. This only gets called
	# if the git-archive 'subst' keywords were *not* expanded, and
	# _version.py hasn't already been rewritten with a short version string,
	# meaning we're inside a checked out source tree.

	if not os.path.exists(os.path.join(root, ".git")):
		if verbose:
			print("no .git in %s" % root)
		raise NotThisMethod("no .git directory")

	GITS = ["git"]
	if sys.platform == "win32":
		GITS = ["git.cmd", "git.exe"]
	# if there is a tag, this yields TAG-NUM-gHEX[-dirty]
	# if there are no tags, this yields HEX[-dirty] (no NUM)
	describe_out = run_command(GITS, ["describe", "--tags", "--dirty",
									  "--always", "--long"],
							   cwd=root)
	# --long was added in git-1.5.5
	if describe_out is None:
		raise NotThisMethod("'git describe' failed")
	describe_out = describe_out.strip()
	full_out = run_command(GITS, ["rev-parse", "HEAD"], cwd=root)
	if full_out is None:
		raise NotThisMethod("'git rev-parse' failed")
	full_out = full_out.strip()

	pieces = {}
	pieces["long"] = full_out
	pieces["short"] = full_out[:7]  # maybe improved later
	pieces["error"] = None

	# parse describe_out. It will be like TAG-NUM-gHEX[-dirty] or HEX[-dirty]
	# TAG might have hyphens.
	git_describe = describe_out

	# look for -dirty suffix
	dirty = git_describe.endswith("-dirty")
	pieces["dirty"] = dirty
	if dirty:
		git_describe = git_describe[:git_describe.rindex("-dirty")]

	# now we have TAG-NUM-gHEX or HEX

	if "-" in git_describe:
		# TAG-NUM-gHEX
		mo = re.search(r'^(.+)-(\d+)-g([0-9a-f]+)$', git_describe)
		if not mo:
			# unparseable. Maybe git-describe is misbehaving?
			pieces["error"] = ("unable to parse git-describe output: '%s'"
							   % describe_out)
			return pieces

		# tag
		full_tag = mo.group(1)
		if not full_tag.startswith(tag_prefix):
			if verbose:
				fmt = "tag '%s' doesn't start with prefix '%s'"
				print(fmt % (full_tag, tag_prefix))
			pieces["error"] = ("tag '%s' doesn't start with prefix '%s'"
							   % (full_tag, tag_prefix))
			return pieces
		pieces["closest-tag"] = full_tag[len(tag_prefix):]

		# distance: number of commits since tag
		pieces["distance"] = int(mo.group(2))

		# commit: short hex revision ID
		pieces["short"] = mo.group(3)

	else:
		# HEX: no tags
		pieces["closest-tag"] = None
		count_out = run_command(GITS, ["rev-list", "HEAD", "--count"],
								cwd=root)
		pieces["distance"] = int(count_out)  # total number of commits

	return pieces


def plus_or_dot(pieces):
	if "+" in pieces.get("closest-tag", ""):
		return "."
	return "+"


def render_pep440(pieces):
	# now build up version string, with post-release "local version
	# identifier". Our goal: TAG[+DISTANCE.gHEX[.dirty]] . Note that if you
	# get a tagged build and then dirty it, you'll get TAG+0.gHEX.dirty

	# exceptions:
	# 1: no tags. git_describe was just HEX. 0+untagged.DISTANCE.gHEX[.dirty]

	if pieces["closest-tag"]:
		rendered = pieces["closest-tag"]
		if pieces["distance"] or pieces["dirty"]:
			rendered += plus_or_dot(pieces)
			rendered += "%d.g%s" % (pieces["distance"], pieces["short"])
			if pieces["dirty"]:
				rendered += ".dirty"
	else:
		# exception #1
		rendered = "0+untagged.%d.g%s" % (pieces["distance"],
										  pieces["short"])
		if pieces["dirty"]:
			rendered += ".dirty"
	return rendered


def render_pep440_pre(pieces):
	# TAG[.post.devDISTANCE] . No -dirty

	# exceptions:
	# 1: no tags. 0.post.devDISTANCE

	if pieces["closest-tag"]:
		rendered = pieces["closest-tag"]
		if pieces["distance"]:
			rendered += ".post.dev%d" % pieces["distance"]
	else:
		# exception #1
		rendered = "0.post.dev%d" % pieces["distance"]
	return rendered


def render_pep440_post(pieces):
	# TAG[.postDISTANCE[.dev0]+gHEX] . The ".dev0" means dirty. Note that
	# .dev0 sorts backwards (a dirty tree will appear "older" than the
	# corresponding clean one), but you shouldn't be releasing software with
	# -dirty anyways.

	# exceptions:
	# 1: no tags. 0.postDISTANCE[.dev0]

	if pieces["closest-tag"]:
		rendered = pieces["closest-tag"]
		if pieces["distance"] or pieces["dirty"]:
			rendered += ".post%d" % pieces["distance"]
			if pieces["dirty"]:
				rendered += ".dev0"
			rendered += plus_or_dot(pieces)
			rendered += "g%s" % pieces["short"]
	else:
		# exception #1
		rendered = "0.post%d" % pieces["distance"]
		if pieces["dirty"]:
			rendered += ".dev0"
		rendered += "+g%s" % pieces["short"]
	return rendered


def render_pep440_old(pieces):
	# TAG[.postDISTANCE[.dev0]] . The ".dev0" means dirty.

	# exceptions:
	# 1: no tags. 0.postDISTANCE[.dev0]

	if pieces["closest-tag"]:
		rendered = pieces["closest-tag"]
		if pieces["distance"] or pieces["dirty"]:
			rendered += ".post%d" % pieces["distance"]
			if pieces["dirty"]:
				rendered += ".dev0"
	else:
		# exception #1
		rendered = "0.post%d" % pieces["distance"]
		if pieces["dirty"]:
			rendered += ".dev0"
	return rendered


def render_git_describe(pieces):
	# TAG[-DISTANCE-gHEX][-dirty], like 'git describe --tags --dirty
	# --always'

	# exceptions:
	# 1: no tags. HEX[-dirty]  (note: no 'g' prefix)

	if pieces["closest-tag"]:
		rendered = pieces["closest-tag"]
		if pieces["distance"]:
			rendered += "-%d-g%s" % (pieces["distance"], pieces["short"])
	else:
		# exception #1
		rendered = pieces["short"]
	if pieces["dirty"]:
		rendered += "-dirty"
	return rendered


def render_git_describe_long(pieces):
	# TAG-DISTANCE-gHEX[-dirty], like 'git describe --tags --dirty
	# --always -long'. The distance/hash is unconditional.

	# exceptions:
	# 1: no tags. HEX[-dirty]  (note: no 'g' prefix)

	if pieces["closest-tag"]:
		rendered = pieces["closest-tag"]
		rendered += "-%d-g%s" % (pieces["distance"], pieces["short"])
	else:
		# exception #1
		rendered = pieces["short"]
	if pieces["dirty"]:
		rendered += "-dirty"
	return rendered


def render(pieces, style):
	if pieces["error"]:
		return {"version": "unknown",
				"full-revisionid": pieces.get("long"),
				"dirty": None,
				"error": pieces["error"]}

	if not style or style == "default":
		style = "pep440"  # the default

	if style == "pep440":
		rendered = render_pep440(pieces)
	elif style == "pep440-pre":
		rendered = render_pep440_pre(pieces)
	elif style == "pep440-post":
		rendered = render_pep440_post(pieces)
	elif style == "pep440-old":
		rendered = render_pep440_old(pieces)
	elif style == "git-describe":
		rendered = render_git_describe(pieces)
	elif style == "git-describe-long":
		rendered = render_git_describe_long(pieces)
	else:
		raise ValueError("unknown style '%s'" % style)

	return {"version": rendered, "full-revisionid": pieces["long"],
			"dirty": pieces["dirty"], "error": None}


def get_versions():
	# I am in _version.py, which lives at ROOT/VERSIONFILE_SOURCE. If we have
	# __file__, we can work backwards from there to the root. Some
	# py2exe/bbfreeze/non-CPython implementations don't do __file__, in which
	# case we can only use expanded keywords.

	cfg = get_config()
	verbose = cfg.verbose

	try:
		return git_versions_from_keywords(get_keywords(), cfg.tag_prefix,
										  verbose)
	except NotThisMethod:
		pass

	try:
		root = os.path.realpath(__file__)
		# versionfile_source is the relative path from the top of the source
		# tree (where the .git directory might live) to this file. Invert
		# this to find the root from __file__.
		for i in cfg.versionfile_source.split('/'):
			root = os.path.dirname(root)
	except NameError:
		return {"version": "0+unknown", "full-revisionid": None,
				"dirty": None,
				"error": "unable to find root of source tree"}

	try:
		pieces = git_pieces_from_vcs(cfg.tag_prefix, root, verbose)
		return render(pieces, cfg.style)
	except NotThisMethod:
		pass

	try:
		if cfg.parentdir_prefix:
			return versions_from_parentdir(cfg.parentdir_prefix, root, verbose)
	except NotThisMethod:
		pass

	return {"version": "0+unknown", "full-revisionid": None,
			"dirty": None,
			"error": "unable to compute version"}
