Uniform iterators for trees, index, and workdir

This create a new git_iterator type of object that provides a
uniform interface for iterating over the index, an arbitrary
tree, or the working directory of a repository.

As part of this, git ignore support was extended to support
push and pop of directory-based ignore files as the working
directory is being traversed (so the array of ignores does
not have to be recreated at each directory during traveral).

There are a number of other small utility functions in buffer,
path, vector, and fileops that are included in this patch
that made the iterator implementation cleaner.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/fileops.h b/src/fileops.h
index c9ed05de3..4c114026b 100644
--- a/src/fileops.h
+++ b/src/fileops.h
@@ -85,13 +85,18 @@ extern int git_futils_mktmp(git_buf *path_out, const char *filename);
  */
 extern int git_futils_mv_withpath(const char *from, const char *to, const mode_t dirmode);
 
-
 /**
  * Get the filesize in bytes of a file
  */
 extern git_off_t git_futils_filesize(git_file fd);
 
 /**
+ * Convert a mode_t from the OS to a legal git mode_t value.
+ */
+extern mode_t git_futils_canonical_mode(mode_t raw_mode);
+
+
+/**
  * Read-only map all or part of a file into memory.
  * When possible this function should favor a virtual memory
  * style mapping over some form of malloc()+read(), as the