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The iterator interface is modeled on that for references, though no vtable is necessary because there is (so far?) only one type of dir_iterator. There are obviously a lot of features that could easily be added to this class: * Skip/include directory paths in the iteration * Shallow/deep iteration * Letting the caller decide which subdirectories to recurse into (e.g., via a dir_iterator_advance_into() function) * Option to iterate in sorted order * Option to iterate over directory paths before vs. after their contents But these are not needed for the current patch series, so I refrain. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
#ifndef DIR_ITERATOR_H
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#define DIR_ITERATOR_H
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/*
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* Iterate over a directory tree.
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*
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* Iterate over a directory tree, recursively, including paths of all
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* types and hidden paths. Skip "." and ".." entries and don't follow
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* symlinks except for the original path.
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*
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* Every time dir_iterator_advance() is called, update the members of
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* the dir_iterator structure to reflect the next path in the
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* iteration. The order that paths are iterated over within a
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* directory is undefined, but directory paths are always iterated
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* over before the subdirectory contents.
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*
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* A typical iteration looks like this:
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*
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* int ok;
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* struct iterator *iter = dir_iterator_begin(path);
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*
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* while ((ok = dir_iterator_advance(iter)) == ITER_OK) {
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* if (want_to_stop_iteration()) {
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* ok = dir_iterator_abort(iter);
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* break;
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* }
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*
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* // Access information about the current path:
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* if (S_ISDIR(iter->st.st_mode))
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* printf("%s is a directory\n", iter->relative_path);
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* }
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*
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* if (ok != ITER_DONE)
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* handle_error();
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*
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* Callers are allowed to modify iter->path while they are working,
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* but they must restore it to its original contents before calling
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* dir_iterator_advance() again.
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*/
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struct dir_iterator {
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/* The current path: */
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struct strbuf path;
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/*
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* The current path relative to the starting path. This part
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* of the path always uses "/" characters to separate path
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* components:
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*/
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const char *relative_path;
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/* The current basename: */
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const char *basename;
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/* The result of calling lstat() on path: */
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struct stat st;
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};
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/*
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* Start a directory iteration over path. Return a dir_iterator that
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* holds the internal state of the iteration.
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*
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* The iteration includes all paths under path, not including path
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* itself and not including "." or ".." entries.
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*
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* path is the starting directory. An internal copy will be made.
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*/
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struct dir_iterator *dir_iterator_begin(const char *path);
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/*
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* Advance the iterator to the first or next item and return ITER_OK.
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* If the iteration is exhausted, free the dir_iterator and any
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* resources associated with it and return ITER_DONE. On error, free
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* dir_iterator and associated resources and return ITER_ERROR. It is
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* a bug to use iterator or call this function again after it has
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* returned ITER_DONE or ITER_ERROR.
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*/
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int dir_iterator_advance(struct dir_iterator *iterator);
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/*
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* End the iteration before it has been exhausted. Free the
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* dir_iterator and any associated resources and return ITER_DONE. On
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* error, free the dir_iterator and return ITER_ERROR.
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*/
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int dir_iterator_abort(struct dir_iterator *iterator);
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#endif
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