Add documentation for the index reading api. This also includes
documentation for the new api functions introduced in the next patch.
Helped-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
Signed-off-by: Thomas Gummerer <t.gummerer@xxxxxxxxx>
---
Documentation/technical/api-in-core-index.txt | 54 +++++++++++++++++++++++++--
1 file changed, 50 insertions(+), 4 deletions(-)
diff --git a/Documentation/technical/api-in-core-index.txt b/Documentation/technical/api-in-core-index.txt
index adbdbf5..9b8c37c 100644
--- a/Documentation/technical/api-in-core-index.txt
+++ b/Documentation/technical/api-in-core-index.txt
@@ -1,14 +1,60 @@
in-core index API
=================
+Reading API
+-----------
+
+`cache`::
+
+ An array of cache entries. This is used to access the cache
+ entries directly. Use `index_name_pos` to search for the
+ index of a specific cache entry.
+
+`read_index_filtered`::
+
+ Read a part of the index, filtered by the pathspec given in
+ the opts. The function may load more than necessary, so the
+ caller still responsible to apply filters appropriately. The
+ filtering is only done for performance reasons, as it's
+ possible to only read part of the index when the on-disk
+ format is index-v5.
+
+ To iterate only over the entries that match the pathspec, use
+ the for_each_index_entry function.
+
+`read_index`::
+
+ Read the whole index file from disk.
+
+`index_name_pos`::
+
+ Find a cache_entry with name in the index. Returns pos if an
+ entry is matched exactly and -1-pos if an entry is matched
+ partially.
+ e.g.
+ index:
+ file1
+ file2
+ path/file1
+ zzz
+
+ index_name_pos("path/file1", 10) returns 2, while
+ index_name_pos("path", 4) returns -3
+
+`for_each_index_entry`::
+
+ Iterates over all cache_entries in the index filtered by
+ filter_opts in the index_state. For each cache entry fn is
+ executed with cb_data as callback data. From within the loop
+ do `return 0` to continue, or `return 1` to break the loop.
+
+TODO
+----
Talk about <read-cache.c> and <cache-tree.c>, things like:
-* cache -> the_index macros
-* read_index()
* write_index()
* ie_match_stat() and ie_modified(); how they are different and when to
use which.
-* index_name_pos()
* remove_index_entry_at()
* remove_file_from_index()
* add_file_to_index()
@@ -18,4 +64,4 @@ Talk about <read-cache.c> and <cache-tree.c>, things like:
* cache_tree_invalidate_path()
* cache_tree_update()
-(JC, Linus)
+(JC, Linus, Thomas Gummerer)
--
1.8.3.4.1231.g9fbf354.dirty
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