/brz/remove-bazaar : contents of breezy/plugins/propose/propose.py at revision 7316

: (revision 7316)

To get this branch, use:

bzr branch
http://gegoxaren.bato24.eu/bzr/brz/remove-bazaar

# Copyright (C) 2018 Breezy Developers
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Helper functions for proposing merges."""

from __future__ import absolute_import

from ... import (
    errors,
    hooks,
    registry,
    urlutils,
    )


class NoSuchProject(errors.BzrError):

    _fmt = "Project does not exist: %(project)s."

    def __init__(self, project):
        errors.BzrError.__init__(self)
        self.project = project


class MergeProposalExists(errors.BzrError):

    _fmt = "A merge proposal already exists: %(url)s."

    def __init__(self, url):
        errors.BzrError.__init__(self)
        self.url = url


class UnsupportedHoster(errors.BzrError):

    _fmt = "No supported hoster for %(branch)s."

    def __init__(self, branch):
        errors.BzrError.__init__(self)
        self.branch = branch


class ProposeMergeHooks(hooks.Hooks):
    """Hooks for proposing a merge on Launchpad."""

    def __init__(self):
        hooks.Hooks.__init__(self, __name__, "Proposer.hooks")
        self.add_hook(
            'get_prerequisite',
            "Return the prerequisite branch for proposing as merge.", (3, 0))
        self.add_hook(
            'merge_proposal_body',
            "Return an initial body for the merge proposal message.", (3, 0))


class LabelsUnsupported(errors.BzrError):
    """Labels not supported by this hoster."""

    _fmt = "Labels are not supported by %(hoster)r."

    def __init__(self, hoster):
        errors.BzrError.__init__(self)
        self.hoster = hoster


class PrerequisiteBranchUnsupported(errors.BzrError):
    """Prerequisite branch not supported by this hoster."""

    def __init__(self, hoster):
        errors.BzrError.__init__(self)
        self.hoster = hoster


class HosterLoginRequired(errors.BzrError):
    """Action requires hoster login credentials."""

    _fmt = "Action requires credentials for hosting site %(hoster)r."""

    def __init__(self, hoster):
        errors.BzrError.__init__(self)
        self.hoster = hoster


class MergeProposal(object):
    """A merge proposal.

    :ivar url: URL for the merge proposal
    """

    def __init__(self, url=None):
        self.url = url

    def get_description(self):
        """Get the description of the merge proposal."""
        raise NotImplementedError(self.get_description)

    def set_description(self, description):
        """Set the description of the merge proposal."""
        raise NotImplementedError(self.set_description)

    def get_commit_message(self):
        """Get the proposed commit message."""
        raise NotImplementedError(self.get_commit_message)

    def set_commit_message(self, commit_message):
        """Set the propose commit message."""
        raise NotImplementedError(self.set_commit_message)

    def get_source_branch_url(self):
        """Return the source branch."""
        raise NotImplementedError(self.get_source_branch_url)

    def get_target_branch_url(self):
        """Return the target branch."""
        raise NotImplementedError(self.get_target_branch_url)

    def close(self):
        """Close the merge proposal (without merging it)."""
        raise NotImplementedError(self.close)

    def is_merged(self):
        """Check whether this merge proposal has been merged."""
        raise NotImplementedError(self.is_merged)


class MergeProposalBuilder(object):
    """Merge proposal creator.

    :param source_branch: Branch to propose for merging
    :param target_branch: Target branch
    """

    hooks = ProposeMergeHooks()

    def __init__(self, source_branch, target_branch):
        self.source_branch = source_branch
        self.target_branch = target_branch

    def get_initial_body(self):
        """Get a body for the proposal for the user to modify.

        :return: a str or None.
        """
        raise NotImplementedError(self.get_initial_body)

    def get_infotext(self):
        """Determine the initial comment for the merge proposal.
        """
        raise NotImplementedError(self.get_infotext)

    def create_proposal(self, description, reviewers=None, labels=None,
                        prerequisite_branch=None, commit_message=None):
        """Create a proposal to merge a branch for merging.

        :param description: Description for the merge proposal
        :param reviewers: Optional list of people to ask reviews from
        :param labels: Labels to attach to the proposal
        :param prerequisite_branch: Optional prerequisite branch
        :param commit_message: Optional commit message
        :return: A `MergeProposal` object
        """
        raise NotImplementedError(self.create_proposal)


class Hoster(object):
    """A hosting site manager.
    """

    # Does this hoster support arbitrary labels being attached to merge
    # proposals?
    supports_merge_proposal_labels = None

    # Does this hoster support suggesting a commit message in the
    # merge proposal?
    supports_merge_proposal_commit_message = None

    # The base_url that would be visible to users. I.e. https://github.com/
    # rather than https://api.github.com/
    base_url = None

    def publish_derived(self, new_branch, base_branch, name, project=None,
                        owner=None, revision_id=None, overwrite=False,
                        allow_lossy=True):
        """Publish a branch to the site, derived from base_branch.

        :param base_branch: branch to derive the new branch from
        :param new_branch: branch to publish
        :return: resulting branch, public URL
        :raise HosterLoginRequired: Action requires a hoster login, but none is
            known.
        """
        raise NotImplementedError(self.publish)

    def get_derived_branch(self, base_branch, name, project=None, owner=None):
        """Get a derived branch ('a fork').
        """
        raise NotImplementedError(self.get_derived_branch)

    def get_push_url(self, branch):
        """Get the push URL for a branch."""
        raise NotImplementedError(self.get_push_url)

    def get_proposer(self, source_branch, target_branch):
        """Get a merge proposal creator.

        :note: source_branch does not have to be hosted by the hoster.

        :param source_branch: Source branch
        :param target_branch: Target branch
        :return: A MergeProposalBuilder object
        """
        raise NotImplementedError(self.get_proposer)

    def iter_proposals(self, source_branch, target_branch, status='open'):
        """Get a merge proposal for a specified branch tuple.

        :param source_branch: Source branch
        :param target_branch: Target branch
        :param status: Status of proposals to iterate over
        :return: Iterate over MergeProposal object
        """
        raise NotImplementedError(self.iter_proposals)

    def hosts(self, branch):
        """Return true if this hoster hosts given branch."""
        raise NotImplementedError(self.hosts)

    @classmethod
    def probe_from_branch(cls, branch):
        """Create a Hoster object if this hoster knows about a branch."""
        url = urlutils.split_segment_parameters(branch.user_url)[0]
        return cls.probe_from_url(url)

    @classmethod
    def probe_from_url(cls, url):
        """Create a Hoster object if this hoster knows about a URL."""
        raise NotImplementedError(cls.probe_from_url)

    # TODO(jelmer): Some way of cleaning up old branch proposals/branches

    def iter_my_proposals(self, status='open'):
        """Iterate over the proposals created by the currently logged in user.

        :param status: Only yield proposals with this status
            (one of: 'open', 'closed', 'merged', 'all')
        :return: Iterator over MergeProposal objects
        :raise HosterLoginRequired: Action requires a hoster login, but none is
            known.
        """
        raise NotImplementedError(self.iter_my_proposals)

    @classmethod
    def iter_instances(cls):
        """Iterate instances.

        :return: Hoster instances
        """
        raise NotImplementedError(cls.iter_instances)


def get_hoster(branch, possible_hosters=None):
    """Find the hoster for a branch."""
    if possible_hosters:
        for hoster in possible_hosters:
            if hoster.hosts(branch):
                return hoster
    for name, hoster_cls in hosters.items():
        try:
            hoster = hoster_cls.probe_from_branch(branch)
        except UnsupportedHoster:
            pass
        else:
            if possible_hosters is not None:
                possible_hosters.append(hoster)
            return hoster
    raise UnsupportedHoster(branch)


hosters = registry.Registry()
hosters.register_lazy(
    "launchpad", "breezy.plugins.propose.launchpad",
    "Launchpad")
hosters.register_lazy(
    "github", "breezy.plugins.propose.github",
    "GitHub")
hosters.register_lazy(
    "gitlab", "breezy.plugins.propose.gitlabs",
    "GitLab")

0.431.1 by Jelmer Vernooĳ Start work on propose command.	1	# Copyright (C) 2018 Breezy Developers
	2	#
	3	# This program is free software; you can redistribute it and/or modify
	4	# it under the terms of the GNU General Public License as published by
	5	# the Free Software Foundation; either version 2 of the License, or
	6	# (at your option) any later version.
	7	#
	8	# This program is distributed in the hope that it will be useful,
	9	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	# GNU General Public License for more details.
	12	#
	13	# You should have received a copy of the GNU General Public License
	14	# along with this program; if not, write to the Free Software
	15	# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	16
	17	"""Helper functions for proposing merges."""
	18
	19	from __future__ import absolute_import
	20
	21	from ... import (
	22	errors,
	23	hooks,
	24	registry,
7268.12.3 by Jelmer Vernooĳ Add missing import.	25	urlutils,
0.431.1 by Jelmer Vernooĳ Start work on propose command.	26	)
	27
	28
0.431.38 by Jelmer Vernooĳ Add NoSuchProject.	29	class NoSuchProject(errors.BzrError):
	30
	31	_fmt = "Project does not exist: %(project)s."
	32
	33	def __init__(self, project):
	34	errors.BzrError.__init__(self)
	35	self.project = project
	36
	37
0.431.2 by Jelmer Vernooĳ Add launchpad implementation.	38	class MergeProposalExists(errors.BzrError):
	39
	40	_fmt = "A merge proposal already exists: %(url)s."
	41
	42	def __init__(self, url):
	43	errors.BzrError.__init__(self)
	44	self.url = url
	45
	46
0.432.2 by Jelmer Vernooĳ Publish command sort of works.	47	class UnsupportedHoster(errors.BzrError):
	48
	49	_fmt = "No supported hoster for %(branch)s."
	50
	51	def __init__(self, branch):
	52	errors.BzrError.__init__(self)
	53	self.branch = branch
	54
	55
0.431.1 by Jelmer Vernooĳ Start work on propose command.	56	class ProposeMergeHooks(hooks.Hooks):
	57	"""Hooks for proposing a merge on Launchpad."""
	58
	59	def __init__(self):
	60	hooks.Hooks.__init__(self, __name__, "Proposer.hooks")
0.431.57 by Jelmer Vernooĳ Cleanups.	61	self.add_hook(
0.431.57 by Jelmer Vernooĳ Cleanups.	62	'get_prerequisite',
0.431.1 by Jelmer Vernooĳ Start work on propose command.	63	"Return the prerequisite branch for proposing as merge.", (3, 0))
0.431.57 by Jelmer Vernooĳ Cleanups.	64	self.add_hook(
0.431.57 by Jelmer Vernooĳ Cleanups.	65	'merge_proposal_body',
0.431.1 by Jelmer Vernooĳ Start work on propose command.	66	"Return an initial body for the merge proposal message.", (3, 0))
	67
	68
0.431.13 by Jelmer Vernooĳ Add support for labels on merge proposals.	69	class LabelsUnsupported(errors.BzrError):
	70	"""Labels not supported by this hoster."""
	71
	72	_fmt = "Labels are not supported by %(hoster)r."
	73
	74	def __init__(self, hoster):
	75	errors.BzrError.__init__(self)
	76	self.hoster = hoster
	77
	78
0.431.56 by Jelmer Vernooĳ Add support for prerequisite branches.	79	class PrerequisiteBranchUnsupported(errors.BzrError):
	80	"""Prerequisite branch not supported by this hoster."""
	81
	82	def __init__(self, hoster):
	83	errors.BzrError.__init__(self)
	84	self.hoster = hoster
	85
	86
7268.8.1 by Jelmer Vernooĳ Add HosterLoginRequired exception.	87	class HosterLoginRequired(errors.BzrError):
	88	"""Action requires hoster login credentials."""
	89
7268.8.2 by Jelmer Vernooĳ Handle GitHub errors.	90	_fmt = "Action requires credentials for hosting site %(hoster)r."""
7268.8.2 by Jelmer Vernooĳ Handle GitHub errors.	91
7268.8.1 by Jelmer Vernooĳ Add HosterLoginRequired exception.	92	def __init__(self, hoster):
	93	errors.BzrError.__init__(self)
	94	self.hoster = hoster
	95
	96
0.431.3 by Jelmer Vernooĳ Add a MergeProposal object.	97	class MergeProposal(object):
	98	"""A merge proposal.
	99
	100	:ivar url: URL for the merge proposal
	101	"""
	102
	103	def __init__(self, url=None):
	104	self.url = url
	105
0.431.39 by Jelmer Vernooĳ Extend the merge proposal abstraction a bit.	106	def get_description(self):
	107	"""Get the description of the merge proposal."""
	108	raise NotImplementedError(self.get_description)
	109
	110	def set_description(self, description):
	111	"""Set the description of the merge proposal."""
	112	raise NotImplementedError(self.set_description)
	113
7296.8.2 by Jelmer Vernooĳ Add feature flag for commit message.	114	def get_commit_message(self):
	115	"""Get the proposed commit message."""
	116	raise NotImplementedError(self.get_commit_message)
	117
	118	def set_commit_message(self, commit_message):
	119	"""Set the propose commit message."""
	120	raise NotImplementedError(self.set_commit_message)
	121
0.431.64 by Jelmer Vernooĳ Add get_source_branch_url/get_target_branch_url methods.	122	def get_source_branch_url(self):
	123	"""Return the source branch."""
	124	raise NotImplementedError(self.get_source_branch_url)
	125
	126	def get_target_branch_url(self):
	127	"""Return the target branch."""
	128	raise NotImplementedError(self.get_target_branch_url)
	129
0.431.39 by Jelmer Vernooĳ Extend the merge proposal abstraction a bit.	130	def close(self):
	131	"""Close the merge proposal (without merging it)."""
	132	raise NotImplementedError(self.close)
	133
0.431.46 by Jelmer Vernooĳ Add MergeProposal.is_merged.	134	def is_merged(self):
	135	"""Check whether this merge proposal has been merged."""
	136	raise NotImplementedError(self.is_merged)
	137
0.431.3 by Jelmer Vernooĳ Add a MergeProposal object.	138
0.432.2 by Jelmer Vernooĳ Publish command sort of works.	139	class MergeProposalBuilder(object):
0.431.1 by Jelmer Vernooĳ Start work on propose command.	140	"""Merge proposal creator.
	141
	142	:param source_branch: Branch to propose for merging
	143	:param target_branch: Target branch
	144	"""
	145
	146	hooks = ProposeMergeHooks()
	147
	148	def __init__(self, source_branch, target_branch):
	149	self.source_branch = source_branch
	150	self.target_branch = target_branch
	151
0.431.2 by Jelmer Vernooĳ Add launchpad implementation.	152	def get_initial_body(self):
	153	"""Get a body for the proposal for the user to modify.
	154
	155	:return: a str or None.
	156	"""
	157	raise NotImplementedError(self.get_initial_body)
	158
	159	def get_infotext(self):
	160	"""Determine the initial comment for the merge proposal.
	161	"""
	162	raise NotImplementedError(self.get_infotext)
	163
0.431.56 by Jelmer Vernooĳ Add support for prerequisite branches.	164	def create_proposal(self, description, reviewers=None, labels=None,
7296.8.1 by Jelmer Vernooĳ Add commit-message option to 'brz propose'.	165	prerequisite_branch=None, commit_message=None):
0.431.1 by Jelmer Vernooĳ Start work on propose command.	166	"""Create a proposal to merge a branch for merging.
0.431.2 by Jelmer Vernooĳ Add launchpad implementation.	167
0.431.2 by Jelmer Vernooĳ Add launchpad implementation.	168	:param description: Description for the merge proposal
0.431.5 by Jelmer Vernooĳ Initial work on gitlab support.	169	:param reviewers: Optional list of people to ask reviews from
0.431.13 by Jelmer Vernooĳ Add support for labels on merge proposals.	170	:param labels: Labels to attach to the proposal
0.431.56 by Jelmer Vernooĳ Add support for prerequisite branches.	171	:param prerequisite_branch: Optional prerequisite branch
7296.8.1 by Jelmer Vernooĳ Add commit-message option to 'brz propose'.	172	:param commit_message: Optional commit message
0.431.3 by Jelmer Vernooĳ Add a MergeProposal object.	173	:return: A `MergeProposal` object
0.431.1 by Jelmer Vernooĳ Start work on propose command.	174	"""
	175	raise NotImplementedError(self.create_proposal)
	176
	177
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	178	class Hoster(object):
	179	"""A hosting site manager.
	180	"""
	181
7260.1.1 by Jelmer Vernooĳ Add .base_url property to Hoster.	182	# Does this hoster support arbitrary labels being attached to merge
	183	# proposals?
0.431.13 by Jelmer Vernooĳ Add support for labels on merge proposals.	184	supports_merge_proposal_labels = None
	185
7296.8.2 by Jelmer Vernooĳ Add feature flag for commit message.	186	# Does this hoster support suggesting a commit message in the
	187	# merge proposal?
	188	supports_merge_proposal_commit_message = None
	189
7260.1.1 by Jelmer Vernooĳ Add .base_url property to Hoster.	190	# The base_url that would be visible to users. I.e. https://github.com/
	191	# rather than https://api.github.com/
	192	base_url = None
	193
0.431.20 by Jelmer Vernooĳ publish -> publish_derived.	194	def publish_derived(self, new_branch, base_branch, name, project=None,
0.431.51 by Jelmer Vernooĳ Allow fallback to lossy by default.	195	owner=None, revision_id=None, overwrite=False,
	196	allow_lossy=True):
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	197	"""Publish a branch to the site, derived from base_branch.
	198
	199	:param base_branch: branch to derive the new branch from
	200	:param new_branch: branch to publish
0.432.3 by Jelmer Vernooĳ Publish command works for github.	201	:return: resulting branch, public URL
7268.8.1 by Jelmer Vernooĳ Add HosterLoginRequired exception.	202	:raise HosterLoginRequired: Action requires a hoster login, but none is
	203	known.
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	204	"""
	205	raise NotImplementedError(self.publish)
	206
0.431.22 by Jelmer Vernooĳ Add Hoster.get_derived_branch.	207	def get_derived_branch(self, base_branch, name, project=None, owner=None):
0.431.31 by Jelmer Vernooĳ Drop autopropose command.	208	"""Get a derived branch ('a fork').
0.431.31 by Jelmer Vernooĳ Drop autopropose command.	209	"""
0.431.22 by Jelmer Vernooĳ Add Hoster.get_derived_branch.	210	raise NotImplementedError(self.get_derived_branch)
0.431.22 by Jelmer Vernooĳ Add Hoster.get_derived_branch.	211
0.431.28 by Jelmer Vernooĳ Implement Hoster.get_push_url.	212	def get_push_url(self, branch):
	213	"""Get the push URL for a branch."""
	214	raise NotImplementedError(self.get_push_url)
	215
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	216	def get_proposer(self, source_branch, target_branch):
	217	"""Get a merge proposal creator.
	218
0.431.31 by Jelmer Vernooĳ Drop autopropose command.	219	:note: source_branch does not have to be hosted by the hoster.
0.431.31 by Jelmer Vernooĳ Drop autopropose command.	220
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	221	:param source_branch: Source branch
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	222	:param target_branch: Target branch
0.432.2 by Jelmer Vernooĳ Publish command sort of works.	223	:return: A MergeProposalBuilder object
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	224	"""
	225	raise NotImplementedError(self.get_proposer)
	226
0.431.68 by Jelmer Vernooĳ Add status to other Hosters.	227	def iter_proposals(self, source_branch, target_branch, status='open'):
0.431.35 by Jelmer Vernooĳ Add Hoster.get_proposal.	228	"""Get a merge proposal for a specified branch tuple.
	229
	230	:param source_branch: Source branch
	231	:param target_branch: Target branch
0.431.68 by Jelmer Vernooĳ Add status to other Hosters.	232	:param status: Status of proposals to iterate over
0.431.67 by Jelmer Vernooĳ Support multiple merge proposals per branch.	233	:return: Iterate over MergeProposal object
0.431.35 by Jelmer Vernooĳ Add Hoster.get_proposal.	234	"""
0.431.67 by Jelmer Vernooĳ Support multiple merge proposals per branch.	235	raise NotImplementedError(self.iter_proposals)
0.431.35 by Jelmer Vernooĳ Add Hoster.get_proposal.	236
0.433.1 by Jelmer Vernooĳ Add Hoster.hosts.	237	def hosts(self, branch):
	238	"""Return true if this hoster hosts given branch."""
	239	raise NotImplementedError(self.hosts)
	240
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	241	@classmethod
7268.12.1 by Jelmer Vernooĳ Split out probe_from_url.	242	def probe_from_branch(cls, branch):
0.432.9 by Jelmer Vernooĳ Drop is_compatible nonesense.	243	"""Create a Hoster object if this hoster knows about a branch."""
7268.12.1 by Jelmer Vernooĳ Split out probe_from_url.	244	url = urlutils.split_segment_parameters(branch.user_url)[0]
	245	return cls.probe_from_url(url)
	246
	247	@classmethod
	248	def probe_from_url(cls, url):
	249	"""Create a Hoster object if this hoster knows about a URL."""
	250	raise NotImplementedError(cls.probe_from_url)
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	251
0.432.4 by Jelmer Vernooĳ Some work on gitlab.	252	# TODO(jelmer): Some way of cleaning up old branch proposals/branches
0.432.4 by Jelmer Vernooĳ Some work on gitlab.	253
0.431.66 by Jelmer Vernooĳ Add support for status argument.	254	def iter_my_proposals(self, status='open'):
0.431.63 by Jelmer Vernooĳ Add 'brz my-proposals' command.	255	"""Iterate over the proposals created by the currently logged in user.
0.431.63 by Jelmer Vernooĳ Add 'brz my-proposals' command.	256
0.431.66 by Jelmer Vernooĳ Add support for status argument.	257	:param status: Only yield proposals with this status
0.431.66 by Jelmer Vernooĳ Add support for status argument.	258	(one of: 'open', 'closed', 'merged', 'all')
0.431.63 by Jelmer Vernooĳ Add 'brz my-proposals' command.	259	:return: Iterator over MergeProposal objects
7268.8.1 by Jelmer Vernooĳ Add HosterLoginRequired exception.	260	:raise HosterLoginRequired: Action requires a hoster login, but none is
	261	known.
0.431.63 by Jelmer Vernooĳ Add 'brz my-proposals' command.	262	"""
	263	raise NotImplementedError(self.iter_my_proposals)
	264
	265	@classmethod
	266	def iter_instances(cls):
	267	"""Iterate instances.
	268
	269	:return: Hoster instances
	270	"""
	271	raise NotImplementedError(cls.iter_instances)
	272
0.432.1 by Jelmer Vernooĳ Initial work on hoster support.	273
0.433.1 by Jelmer Vernooĳ Add Hoster.hosts.	274	def get_hoster(branch, possible_hosters=None):
0.432.2 by Jelmer Vernooĳ Publish command sort of works.	275	"""Find the hoster for a branch."""
0.433.1 by Jelmer Vernooĳ Add Hoster.hosts.	276	if possible_hosters:
	277	for hoster in possible_hosters:
	278	if hoster.hosts(branch):
	279	return hoster
0.432.2 by Jelmer Vernooĳ Publish command sort of works.	280	for name, hoster_cls in hosters.items():
0.432.9 by Jelmer Vernooĳ Drop is_compatible nonesense.	281	try:
7268.12.1 by Jelmer Vernooĳ Split out probe_from_url.	282	hoster = hoster_cls.probe_from_branch(branch)
0.432.9 by Jelmer Vernooĳ Drop is_compatible nonesense.	283	except UnsupportedHoster:
0.432.9 by Jelmer Vernooĳ Drop is_compatible nonesense.	284	pass
0.433.1 by Jelmer Vernooĳ Add Hoster.hosts.	285	else:
	286	if possible_hosters is not None:
	287	possible_hosters.append(hoster)
	288	return hoster
0.432.2 by Jelmer Vernooĳ Publish command sort of works.	289	raise UnsupportedHoster(branch)
	290
	291
	292	hosters = registry.Registry()
	293	hosters.register_lazy(
7211.13.7 by Jelmer Vernooĳ Fix formatting.	294	"launchpad", "breezy.plugins.propose.launchpad",
	295	"Launchpad")
	296	hosters.register_lazy(
	297	"github", "breezy.plugins.propose.github",
	298	"GitHub")
	299	hosters.register_lazy(
	300	"gitlab", "breezy.plugins.propose.gitlabs",
	301	"GitLab")