index.write_tree: initial version implemented, although its not yet working correctly, a test to explicitly compare the git version with the python implementation is still missing

Tree and Index internally use 20 byte shas, converting them only as needed to reduce memory footprint and processing time
objects: started own 'fun' module containing the most important tree functions, more are likely to be added soon

1 files changed, 39 insertions, 31 deletions

diff --git a/lib/git/errors.py b/lib/git/errors.py
index 5fe99915..93919d5e 100644
--- a/lib/git/errors.py
+++ b/lib/git/errors.py
@@ -6,43 +6,51 @@
 """ Module containing all exceptions thrown througout the git package, """
 
 class InvalidGitRepositoryError(Exception):
-    """ Thrown if the given repository appears to have an invalid format.  """
+	""" Thrown if the given repository appears to have an invalid format.  """
 
 
 class NoSuchPathError(OSError):
-    """ Thrown if a path could not be access by the system. """
+	""" Thrown if a path could not be access by the system. """
 
 
 class GitCommandError(Exception):
-    """ Thrown if execution of the git command fails with non-zero status code. """
-    def __init__(self, command, status, stderr=None):
-        self.stderr = stderr
-        self.status = status
-        self.command = command
-        
-    def __str__(self):
-        return ("'%s' returned exit status %i: %s" %
-                    (' '.join(str(i) for i in self.command), self.status, self.stderr))
+	""" Thrown if execution of the git command fails with non-zero status code. """
+	def __init__(self, command, status, stderr=None):
+		self.stderr = stderr
+		self.status = status
+		self.command = command
+		
+	def __str__(self):
+		return ("'%s' returned exit status %i: %s" %
+					(' '.join(str(i) for i in self.command), self.status, self.stderr))
 
 
 class CheckoutError( Exception ):
-    """Thrown if a file could not be checked out from the index as it contained
-    changes.
-
-    The .failed_files attribute contains a list of relative paths that failed
-    to be checked out as they contained changes that did not exist in the index.
-
-    The .failed_reasons attribute contains a string informing about the actual
-    cause of the issue.
-
-    The .valid_files attribute contains a list of relative paths to files that
-    were checked out successfully and hence match the version stored in the
-    index"""
-    def __init__(self, message, failed_files, valid_files, failed_reasons):
-        Exception.__init__(self, message)
-        self.failed_files = failed_files
-        self.failed_reasons = failed_reasons
-        self.valid_files = valid_files
-
-    def __str__(self):
-        return Exception.__str__(self) + ":%s" % self.failed_files
+	"""Thrown if a file could not be checked out from the index as it contained
+	changes.
+
+	The .failed_files attribute contains a list of relative paths that failed
+	to be checked out as they contained changes that did not exist in the index.
+
+	The .failed_reasons attribute contains a string informing about the actual
+	cause of the issue.
+
+	The .valid_files attribute contains a list of relative paths to files that
+	were checked out successfully and hence match the version stored in the
+	index"""
+	def __init__(self, message, failed_files, valid_files, failed_reasons):
+		Exception.__init__(self, message)
+		self.failed_files = failed_files
+		self.failed_reasons = failed_reasons
+		self.valid_files = valid_files
+
+	def __str__(self):
+		return Exception.__str__(self) + ":%s" % self.failed_files
+		
+		
+class CacheError(Exception):
+	"""Base for all errors related to the git index, which is called cache internally"""
+
+class UnmergedEntriesError(CacheError):
+	"""Thrown if an operation cannot proceed as there are still unmerged 
+	entries in the cache"""