/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,

    )

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 NoMergeProposal(errors.BzrError):

    _fmt = "No merge proposal exists."

    def __init__(self):

        errors.BzrError.__init__(self)

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 MergeProposal(object):

    """A merge proposal.

    :ivar url: URL for the merge proposal

    """

    def __init__(self, url=None):

        self.url = url

    # TODO(jelmer): provide some way to check if this merge proposal has been

    # merged.

    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 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):

        """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

        :return: A `MergeProposal` object

        """

        raise NotImplementedError(self.create_proposal)

class Hoster(object):

    """A hosting site manager.

    """

    supports_merge_proposal_labels = 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 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 get_proposal(self, source_branch, target_branch):

        """Get a merge proposal for a specified branch tuple.

        :param source_branch: Source branch

        :param target_branch: Target branch

        :raise NoMergeProposal: if no merge proposal can be found

        :return: A MergeProposal object

        """

        raise NotImplementedError(self.get_proposal)

    def hosts(self, branch):

        """Return true if this hoster hosts given branch."""

        raise NotImplementedError(self.hosts)

    @classmethod

    def probe(cls, branch):

        """Create a Hoster object if this hoster knows about a branch."""

        raise NotImplementedError(cls.probe)

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

    # TODO(jelmer): Some way of checking up on outstanding merge proposals

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(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")