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from head import Head
from git.util import join_path
from gitdb.util import (
join,
file_contents_ro_filepath
)
from git.objects.util import (
Actor,
parse_date,
Serializable,
utctz_to_altz,
altz_to_utctz_str,
)
import os
import re
__all__ = ["RefLog", "RefLogEntry"]
class RefLogEntry(tuple):
"""Named tuple allowing easy access to the revlog data fields"""
_fmt = "%s %s %s <%s> %i %s\t%s\n"
_re_hexsha_only = re.compile('^[0-9A-Fa-f]{40}$')
__slots__ = tuple()
def __repr__(self):
"""Representation of ourselves in git reflog format"""
act = self.actor
time = self.time
return self._fmt % (self.oldhexsha, self.newhexsha, act.name, act.email,
time[0], altz_to_utctz_str(time[1]), self.message)
@property
def oldhexsha(self):
"""The hexsha to the commit the ref pointed to before the change"""
return self[0]
@property
def newhexsha(self):
"""The hexsha to the commit the ref now points to, after the change"""
return self[1]
@property
def actor(self):
"""Actor instance, providing access"""
return self[2]
@property
def time(self):
"""time as tuple:
* [0] = int(time)
* [1] = int(timezone_offset) in time.altzone format """
return self[3]
@property
def message(self):
"""Message describing the operation that acted on the reference"""
return self[4]
@classmethod
def new(self, oldhexsha, newhexsha, actor, time, tz_offset, message):
""":return: New instance of a RefLogEntry"""
if not isinstance(actor, Actor):
raise ValueError("Need actor instance, got %s" % actor)
# END check types
return RefLogEntry((oldhexsha, newhexsha, actor, (time, tz_offset), message))
@classmethod
def from_line(cls, line):
""":return: New RefLogEntry instance from the given revlog line.
:param line: line without trailing newline
:raise ValueError: If line could not be parsed"""
try:
info, msg = line.split('\t', 2)
except ValueError:
raise ValueError("line is missing tab separator")
#END handle first plit
oldhexsha = info[:40]
newhexsha = info[41:81]
for hexsha in (oldhexsha, newhexsha):
if not cls._re_hexsha_only.match(hexsha):
raise ValueError("Invalid hexsha: %s" % hexsha)
# END if hexsha re doesn't match
#END for each hexsha
email_end = info.find('>', 82)
if email_end == -1:
raise ValueError("Missing token: >")
#END handle missing end brace
actor = Actor._from_string(info[82:email_end+1])
time, tz_offset = parse_date(info[email_end+2:])
return RefLogEntry((oldhexsha, newhexsha, actor, (time, tz_offset), msg))
class RefLog(list, Serializable):
"""A reflog contains reflog entries, each of which defines a certain state
of the head in question. Custom query methods allow to retrieve log entries
by date or by other criteria.
Reflog entries are orded, the first added entry is first in the list, the last
entry, i.e. the last change of the head or reference, is last in the list."""
__slots__ = tuple()
#{ Interface
@classmethod
def from_file(cls, filepath):
"""
:return: a new RefLog instance containing all entries from the reflog
at the given filepath
:param filepath: path to reflog
:raise ValueError: If the file could not be read or was corrupted in some way"""
inst = cls()
fmap = file_contents_ro_filepath(filepath, stream=False, allow_mmap=True)
try:
inst._deserialize(fmap)
finally:
fmap.close()
#END handle closing of handle
return inst
@classmethod
def path(cls, ref):
"""
:return: string to absolute path at which the reflog of the given ref
instance would be found. The path is not guaranteed to point to a valid
file though.
:param ref: SymbolicReference instance"""
return join(ref.repo.git_dir, "logs", ref.path)
@classmethod
def iter_entries(cls, stream):
"""
:return: Iterator yielding RefLogEntry instances, one for each line read
sfrom the given stream.
:param stream: file-like object containing the revlog in its native format
or basestring instance pointing to a file to read"""
new_entry = RefLogEntry.from_line
if isinstance(stream, basestring):
stream = file_contents_ro_filepath(stream)
#END handle stream type
while True:
line = stream.readline()
if not line:
return
yield new_entry(line.strip())
#END endless loop
def to_file(self, filepath):
"""Write the contents of the reflog instance to a file at the given filepath.
:param filepath: path to file, parent directories are assumed to exist"""
fp = open(filepath, 'wb')
try:
self._serialize(fp)
finally:
fp.close()
#END handle file streams
#} END interface
#{ Serializable Interface
def _serialize(self, stream):
lm1 = len(self) - 1
write = stream.write
# write all entries
for i, e in enumerate(self):
write(repr(e))
#END for each entry
def _deserialize(self, stream):
self.extend(self.iter_entries(stream))
#} END serializable interface
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