def find_common_parent(self, commit_one, commit_two):
"""Find the common parent between the two commits if one exists"""
one = Commit(self)
one.checkout(commit_one)
two = Commit(self)
two.checkout(commit_two)
listone = one.getAncestors()
listtwo = two.getAncestors()
def compare(a, b):
common = None
for index in range(len(a)):
if a[index] is not b[index]:
return common
common = a[index]
return common
if len(listone) < len(listtwo):
common = compare(listone, listtwo)
else:
common = compare(listtwo, listone)
if not common:
raise NoCommonParent("The commits %s and %s do not share a common parent" % (commit_one, commit_two))
return common
def migrate(self, commit_one, commit_two):
"""Migrate from one commit to another"""
parent = self.find_common_parent(commit_one, commit_two)
c1 = Commit(self)
c1.checkout(commit_one)
c2 = Commit(self)
c2.checkout(commit_two)
log = c1.rollback(parent)
log.extend(c2.rollforward(parent))
return log
def checkout(self, branch_name):
try:
commit_id = self.branches[branch_name]
except KeyError:
raise BranchNotFound("Could not find the %s branch" % branch_name)
try:
commit = self.checkouts[commit_id]
except KeyError:
commit = Commit(self)
commit.checkout(commit_id)
self.checkouts[commit_id] = commit
branch = Branch(self, branch_name, commit)
return branch
