compare: move get_changesets to compare controller where it is used

That is a better location than the pull request model. It should probably be
split up and moved to the backend specific Repository classes.

rhodecode/controllers/compare.py

@@ -1,191 +1,269 b''
 # -*- coding: utf-8 -*-
 """
     rhodecode.controllers.compare
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
     compare controller for pylons showing differences between two
     repos, branches, bookmarks or tips
 
     :created_on: May 6, 2012
     :author: marcink
     :copyright: (C) 2010-2012 Marcin Kuzminski <[e-mail]>
     :license: GPLv3, see COPYING for more details.
 """
 # 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 3 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, see <http://www.gnu.org/licenses/>.
+
 import logging
 import traceback
+import re
 
 from webob.exc import HTTPNotFound
 from pylons import request, response, session, tmpl_context as c, url
 from pylons.controllers.util import abort, redirect
 from pylons.i18n.translation import _
 
 from rhodecode.lib.vcs.exceptions import EmptyRepositoryError, RepositoryError
+from rhodecode.lib.vcs.utils import safe_str
+from rhodecode.lib.vcs.utils.hgcompat import scmutil
 from rhodecode.lib import helpers as h
 from rhodecode.lib.base import BaseRepoController, render
 from rhodecode.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator
-from rhodecode.lib import diffs
+from rhodecode.lib import diffs, unionrepo
 
 from rhodecode.model.db import Repository
-from rhodecode.model.pull_request import PullRequestModel
 from webob.exc import HTTPBadRequest
 from rhodecode.lib.diffs import LimitedDiffContainer
-from rhodecode.lib.vcs.backends.base import EmptyChangeset
+
 
 log = logging.getLogger(__name__)
 
 
 class CompareController(BaseRepoController):
 
     @LoginRequired()
     @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',
                                    'repository.admin')
     def __before__(self):
         super(CompareController, self).__before__()
 
     def __get_cs_or_redirect(self, rev, repo, redirect_after=True,
                              partial=False):
         """
         Safe way to get changeset if error occur it redirects to changeset with
         proper message. If partial is set then don't do redirect raise Exception
         instead
 
         :param rev: revision to fetch
         :param repo: repo instance
         """
 
         try:
             type_, rev = rev
             return repo.scm_instance.get_changeset(rev)
         except EmptyRepositoryError, e:
             if not redirect_after:
                 return None
             h.flash(h.literal(_('There are no changesets yet')),
                     category='warning')
             redirect(url('summary_home', repo_name=repo.repo_name))
 
         except RepositoryError, e:
             log.error(traceback.format_exc())
             h.flash(str(e), category='warning')
             if not partial:
                 redirect(h.url('summary_home', repo_name=repo.repo_name))
             raise HTTPBadRequest()
 
     def index(self, org_ref_type, org_ref, other_ref_type, other_ref):
         # org_ref will be evaluated in org_repo
         org_repo = c.rhodecode_db_repo.repo_name
         org_ref = (org_ref_type, org_ref)
         # other_ref will be evaluated in other_repo
         other_ref = (other_ref_type, other_ref)
         other_repo = request.GET.get('other_repo', org_repo)
         # If merge is True:
         #   Show what org would get if merged with other:
         #   List changesets that are ancestors of other but not of org.
         #   New changesets in org is thus ignored.
         #   Diff will be from common ancestor, and merges of org to other will thus be ignored.
         # If merge is False:
         #   Make a raw diff from org to other, no matter if related or not.
         #   Changesets in one and not in the other will be ignored
         merge = bool(request.GET.get('merge'))
         # fulldiff disables cut_off_limit
         c.fulldiff = request.GET.get('fulldiff')
         # partial uses compare_cs.html template directly
         partial = request.environ.get('HTTP_X_PARTIAL_XHR')
         # as_form puts hidden input field with changeset revisions
         c.as_form = partial and request.GET.get('as_form')
         # swap url for compare_diff page - never partial and never as_form
         c.swap_url = h.url('compare_url',
             repo_name=other_repo,
             org_ref_type=other_ref[0], org_ref=other_ref[1],
             other_repo=org_repo,
             other_ref_type=org_ref[0], other_ref=org_ref[1],
             merge=merge or '')
 
         org_repo = Repository.get_by_repo_name(org_repo)
         other_repo = Repository.get_by_repo_name(other_repo)
 
         if org_repo is None:
             log.error('Could not find org repo %s' % org_repo)
             raise HTTPNotFound
         if other_repo is None:
             log.error('Could not find other repo %s' % other_repo)
             raise HTTPNotFound
 
         if org_repo != other_repo and h.is_git(org_repo):
             log.error('compare of two remote repos not available for GIT REPOS')
             raise HTTPNotFound
 
         if org_repo.scm_instance.alias != other_repo.scm_instance.alias:
             log.error('compare of two different kind of remote repos not available')
             raise HTTPNotFound
 
         self.__get_cs_or_redirect(rev=org_ref, repo=org_repo, partial=partial)
         self.__get_cs_or_redirect(rev=other_ref, repo=other_repo, partial=partial)
 
         c.org_repo = org_repo
         c.other_repo = other_repo
         c.org_ref = org_ref[1]
         c.other_ref = other_ref[1]
         c.org_ref_type = org_ref[0]
         c.other_ref_type = other_ref[0]
 
-        c.cs_ranges, c.ancestor = PullRequestModel().get_compare_data(
-            org_repo, org_ref, other_repo, other_ref, merge)
+        c.cs_ranges, c.ancestor = self._get_changesets(org_repo.scm_instance.alias,
+                                                       org_repo.scm_instance, org_ref,
+                                                       other_repo.scm_instance, other_ref,
+                                                       merge)
 
         c.statuses = c.rhodecode_db_repo.statuses([x.raw_id for x in
                                                    c.cs_ranges])
         if partial:
             assert c.ancestor
             return render('compare/compare_cs.html')
 
         if c.ancestor:
             assert merge
             # case we want a simple diff without incoming changesets,
             # previewing what will be merged.
             # Make the diff on the other repo (which is known to have other_ref)
             log.debug('Using ancestor %s as org_ref instead of %s'
                       % (c.ancestor, org_ref))
             org_ref = ('rev', c.ancestor)
             org_repo = other_repo
 
         diff_limit = self.cut_off_limit if not c.fulldiff else None
 
         log.debug('running diff between %s@%s and %s@%s'
                   % (org_repo.scm_instance.path, org_ref,
                      other_repo.scm_instance.path, other_ref))
         _diff = org_repo.scm_instance.get_diff(rev1=safe_str(org_ref[1]), rev2=safe_str(other_ref[1]))
 
         diff_processor = diffs.DiffProcessor(_diff or '', format='gitdiff',
                                              diff_limit=diff_limit)
         _parsed = diff_processor.prepare()
 
         c.limited_diff = False
         if isinstance(_parsed, LimitedDiffContainer):
             c.limited_diff = True
 
         c.files = []
         c.changes = {}
         c.lines_added = 0
         c.lines_deleted = 0
         for f in _parsed:
             st = f['stats']
             if st[0] != 'b':
                 c.lines_added += st[0]
                 c.lines_deleted += st[1]
             fid = h.FID('', f['filename'])
             c.files.append([fid, f['operation'], f['filename'], f['stats']])
             diff = diff_processor.as_html(enable_comments=False, parsed_lines=[f])
             c.changes[fid] = [f['operation'], f['filename'], diff]
 
         return render('compare/compare_diff.html')
+
+    def _get_changesets(self, alias, org_repo, org_ref, other_repo, other_ref, merge):
+        """
+        Returns a list of changesets that can be merged from org_repo@org_ref
+        to other_repo@other_ref ... and the ancestor that would be used for merge
+
+        :param org_repo:
+        :param org_ref:
+        :param other_repo:
+        :param other_ref:
+        :param tmp:
+        """
+
+        ancestor = None
+
+        if alias == 'hg':
+            # lookup up the exact node id
+            _revset_predicates = {
+                    'branch': 'branch',
+                    'book': 'bookmark',
+                    'tag': 'tag',
+                    'rev': 'id',
+                }
+
+            org_rev_spec = "max(%s('%s'))" % (_revset_predicates[org_ref[0]],
+                                              safe_str(org_ref[1]))
+            org_revs = scmutil.revrange(org_repo._repo, [org_rev_spec])
+            org_rev = org_repo._repo[org_revs[-1] if org_revs else -1].hex()
+
+            other_rev_spec = "max(%s('%s'))" % (_revset_predicates[other_ref[0]],
+                                                safe_str(other_ref[1]))
+            other_revs = scmutil.revrange(other_repo._repo, [other_rev_spec])
+            other_rev = other_repo._repo[other_revs[-1] if other_revs else -1].hex()
+
+            #case two independent repos
+            if org_repo != other_repo:
+                hgrepo = unionrepo.unionrepository(other_repo.baseui,
+                                                   other_repo.path,
+                                                   org_repo.path)
+                # all the changesets we are looking for will be in other_repo,
+                # so rev numbers from hgrepo can be used in other_repo
+
+            #no remote compare do it on the same repository
+            else:
+                hgrepo = other_repo._repo
+
+            if merge:
+                revs = ["ancestors(id('%s')) and not ancestors(id('%s')) and not id('%s')" %
+                        (other_rev, org_rev, org_rev)]
+
+                ancestors = scmutil.revrange(hgrepo,
+                     ["ancestor(id('%s'), id('%s'))" % (org_rev, other_rev)])
+                if ancestors:
+                    # pick arbitrary ancestor - but there is usually only one
+                    ancestor = hgrepo[ancestors[0]].hex()
+            else:
+                # TODO: have both + and - changesets
+                revs = ["id('%s') :: id('%s') - id('%s')" %
+                        (org_rev, other_rev, org_rev)]
+
+            changesets = [other_repo.get_changeset(cs)
+                          for cs in scmutil.revrange(hgrepo, revs)]
+
+        elif alias == 'git':
+            assert org_repo == other_repo, (org_repo, other_repo) # no git support for different repos
+            so, se = org_repo.run_git_command(
+                'log --reverse --pretty="format: %%H" -s -p %s..%s' % (org_ref[1],
+                                                                       other_ref[1])
+            )
+            changesets = [org_repo.get_changeset(cs)
+                          for cs in re.findall(r'[0-9a-fA-F]{40}', so)]
+
+        return changesets, ancestor