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"""igcommit - Git routines

"""

from os.path import isabs, join as joinpath, normpath

from subprocess import check_output

from igcommit.utils import get_exe_path

git_exe_path = get_exe_path('git')

class CommitList(list):

"""Routines on a list of sequential commits"""

ref_path = None

def __init__(self, other, branch_name):

super(CommitList, self).__init__(other)

self.branch_name = branch_name

def __str__(self):

name = '{}..{}'.format(self[0], self[-1])

if self.ref_path:

name += ' ({})'.format(self.branch_name)

return name

class Commit(object):

"""Routines on a single commit"""

null_commit_id = '0000000000000000000000000000000000000000'

def __init__(self, commit_id):

self.commit_id = commit_id

self.content_fetched = False

self.changed_files = None

def __str__(self):

return self.commit_id[:8]

def __bool__(self):

return self.commit_id != Commit.null_commit_id

def __nonzero__(self):

return self.__bool__()

def __eq__(self, other):

return isinstance(other, Commit) and self.commit_id == other.commit_id

def get_new_commits(self):

"""Get the list of parent new commits in order"""

# At pre-receive hook we get one id for each branch pushed and need to

# find commits to be tested. With the test command from the README.md

# this returns nothing.

output = check_output([

git_exe_path,

'rev-list',

self.commit_id,

'--not',

'--all',

'--reverse',

]).decode('utf-8')

for commit_id in output.splitlines():

yield Commit(commit_id)

def _fetch_content(self):

content = check_output(

[git_exe_path, 'cat-file', '-p', self.commit_id]

)

self._parents = []

self._message_lines = []

# The commit message starts after the empty line. We iterate until

# we find one, and then consume the rest as the message.

lines = iter(content.splitlines())

for line in lines:

if not line:

break

if line.startswith(b'parent '):

self._parents.append(Commit(line[len(b'parent '):].rstrip()))

elif line.startswith(b'author '):

self._author = Contributor.parse(line[len(b'author '):])

elif line.startswith(b'committer '):

self._committer = Contributor.parse(line[len(b'committer '):])

for line in lines:

self._message_lines.append(line.decode('utf-8'))

self.content_fetched = True

def get_parents(self):

if not self.content_fetched:

self._fetch_content()

return self._parents

def get_author(self):

if not self.content_fetched:

self._fetch_content()

return self._author

def get_committer(self):

if not self.content_fetched:

self._fetch_content()

return self._committer

def get_contributors(self):

yield self.get_author()

yield self._committer

def get_message_lines(self):

if not self.content_fetched:

self._fetch_content()

return self._message_lines

def get_summary(self):

return self.get_message_lines()[0]

def parse_tags(self):

tags = []

rest = self.get_summary()

while rest.startswith('[') and ']' in rest:

end_index = rest.index(']')

tags.append(rest[1:end_index])

rest = rest[end_index + 1:]

return tags, rest

def content_can_fail(self):

return not any(

t in ['HOTFIX', 'MESS', 'TEMP', 'WIP']

for t in self.parse_tags()[0]

)

def get_changed_files(self):

"""Return the list of added or modified files on a commit"""

if self.changed_files is None:

output = check_output([

git_exe_path,

'diff-tree',

'-r',

'--root', # Get the initial commit as additions

'--no-commit-id', # We already know the commit id.

'--break-rewrites', # Get rewrites as additions

'--no-renames', # Get renames as additions

'--diff-filter=AM', # Only additions and modifications

self.commit_id,

]).decode('utf-8')

changed_files = []

for line in output.splitlines():

line_split = line.split(None, 5)

assert len(line_split) == 6

assert line_split[0].startswith(':')

file_mode = line_split[1]

file_path = line_split[5]

changed_files.append(CommittedFile(file_path, self, file_mode))

self.changed_files = changed_files

return self.changed_files

class Contributor(object):

"""Routines on contribution properties of a commit"""

def __init__(self, name, email, timestamp):

self.name = name

self.email = email

self.timestamp = timestamp

@classmethod

def parse(cls, line):

"""Parse the contribution line as bytes"""

name, line = line.split(b' <', 1)

email, line = line.split(b'> ', 1)

timestamp, line = line.split(b' ', 1)

return cls(name.decode('utf-8'), email.decode('utf-8'), int(timestamp))

def get_email_domain(self):

return self.email.split('@', 1)[-1]

class CommittedFile(object):

"""Routines on a single committed file"""

def __init__(self, path, commit=None, mode=None):

self.path = path

self.commit = commit

assert mode is None or len(mode) == 6

self.mode = mode

self.content = None

def __str__(self):

return '{} at {}'.format(self.path, self.commit)

def __eq__(self, other):

return (

isinstance(other, CommittedFile) and

self.path == other.path and

self.commit == other.commit

)

def exists(self):

return bool(check_output([

git_exe_path,

'ls-tree',

'--name-only',

'-r',

self.commit.commit_id,

self.path,

]))

def changed(self):

return self in self.commit.get_changed_files()

def regular(self):

return self.mode[:2] == '10'

def symlink(self):

return self.mode[:2] == '12'

def owner_can_execute(self):

owner_bits = int(self.mode[-3])

return bool(owner_bits & 1)

def get_filename(self):

return self.path.rsplit('/', 1)[-1]

def get_extension(self):

if '.' not in self.path:

return None

return self.path.rsplit('.', 1)[1]

def get_content(self):

"""Get the file content as binary"""

if self.content is None:

self.content = check_output([

git_exe_path, 'show', self.commit.commit_id + ':' + self.path

])

return self.content

def get_shebang(self):

"""Get the shebang from the file content"""

if not self.regular():

return None

content = self.get_content()

if not content.startswith(b'#!'):

return None

content = content[len(b'#!'):].strip()

return content.split(None, 1)[0].decode('utf-8')

def get_shebang_exe(self):

"""Get the executable from the shebang"""

shebang = self.get_shebang()

if not shebang:

return None

if shebang == '/usr/bin/env':

rest = self.get_content().splitlines()[0][len(b'#!/usr/bin/env'):]

rest_split = rest.split(None, 1)

if rest_split:

return rest_split[0].decode('utf-8')

return shebang.rsplit('/', 1)[-1]

def get_symlink_target(self):

"""Get the symlink target as same kind of instance

We just return None, if the target has no chance to be on

the repository.

"""

content = self.get_content()

if isabs(content):

return None

path = normpath(joinpath(self.path, '..', content.decode('utf-8')))

if path.startswith('..'):

return None

return type(self)(path, self.commit)

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