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-directory listing API
-=====================
-
-The directory listing API is used to enumerate paths in the work tree,
-optionally taking `.git/info/exclude` and `.gitignore` files per
-directory into account.
-
-Data structure
---------------
-
-`struct dir_struct` structure is used to pass directory traversal
-options to the library and to record the paths discovered. A single
-`struct dir_struct` is used regardless of whether or not the traversal
-recursively descends into subdirectories.
-
-The notable options are:
-
-`exclude_per_dir`::
-
- The name of the file to be read in each directory for excluded
- files (typically `.gitignore`).
-
-`flags`::
-
- A bit-field of options:
-
-`DIR_SHOW_IGNORED`:::
-
- Return just ignored files in `entries[]`, not untracked
- files. This flag is mutually exclusive with
- `DIR_SHOW_IGNORED_TOO`.
-
-`DIR_SHOW_IGNORED_TOO`:::
-
- Similar to `DIR_SHOW_IGNORED`, but return ignored files in
- `ignored[]` in addition to untracked files in
- `entries[]`. This flag is mutually exclusive with
- `DIR_SHOW_IGNORED`.
-
-`DIR_KEEP_UNTRACKED_CONTENTS`:::
-
- Only has meaning if `DIR_SHOW_IGNORED_TOO` is also set; if this is set, the
- untracked contents of untracked directories are also returned in
- `entries[]`.
-
-`DIR_SHOW_IGNORED_TOO_MODE_MATCHING`:::
-
- Only has meaning if `DIR_SHOW_IGNORED_TOO` is also set; if
- this is set, returns ignored files and directories that match
- an exclude pattern. If a directory matches an exclude pattern,
- then the directory is returned and the contained paths are
- not. A directory that does not match an exclude pattern will
- not be returned even if all of its contents are ignored. In
- this case, the contents are returned as individual entries.
-+
-If this is set, files and directories that explicitly match an ignore
-pattern are reported. Implicitly ignored directories (directories that
-do not match an ignore pattern, but whose contents are all ignored)
-are not reported, instead all of the contents are reported.
-
-`DIR_COLLECT_IGNORED`:::
-
- Special mode for git-add. Return ignored files in `ignored[]` and
- untracked files in `entries[]`. Only returns ignored files that match
- pathspec exactly (no wildcards). Does not recurse into ignored
- directories.
-
-`DIR_SHOW_OTHER_DIRECTORIES`:::
-
- Include a directory that is not tracked.
-
-`DIR_HIDE_EMPTY_DIRECTORIES`:::
-
- Do not include a directory that is not tracked and is empty.
-
-`DIR_NO_GITLINKS`:::
-
- If set, recurse into a directory that looks like a Git
- directory. Otherwise it is shown as a directory.
-
-The result of the enumeration is left in these fields:
-
-`entries[]`::
-
- An array of `struct dir_entry`, each element of which describes
- a path.
-
-`nr`::
-
- The number of members in `entries[]` array.
-
-`alloc`::
-
- Internal use; keeps track of allocation of `entries[]` array.
-
-`ignored[]`::
-
- An array of `struct dir_entry`, used for ignored paths with the
- `DIR_SHOW_IGNORED_TOO` and `DIR_COLLECT_IGNORED` flags.
-
-`ignored_nr`::
-
- The number of members in `ignored[]` array.
-
-Calling sequence
-----------------
-
-Note: index may be looked at for .gitignore files that are CE_SKIP_WORKTREE
-marked. If you to exclude files, make sure you have loaded index first.
-
-* Prepare `struct dir_struct dir` and clear it with `memset(&dir, 0,
- sizeof(dir))`.
-
-* To add single exclude pattern, call `add_pattern_list()` and then
- `add_pattern()`.
-
-* To add patterns from a file (e.g. `.git/info/exclude`), call
- `add_patterns_from_file()` , and/or set `dir.exclude_per_dir`. A
- short-hand function `setup_standard_excludes()` can be used to set
- up the standard set of exclude settings.
-
-* Set options described in the Data Structure section above.
-
-* Call `read_directory()`.
-
-* Use `dir.entries[]`.
-
-* Call `clear_directory()` when none of the contained elements are no longer in use.
-
-(JC)