Patchwork D1380: dirstate: document dirstatemap interface

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Submitter phabricator
Date Nov. 17, 2017, 10:28 p.m.
Message ID <02d0f65138372e1d1b1f0fd1b02a9720@localhost.localdomain>
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Permalink /patch/25624/
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phabricator - Nov. 17, 2017, 10:28 p.m.
This revision was automatically updated to reflect the committed changes.
Closed by commit rHG74b8563e4f13: dirstate: document dirstatemap interface (authored by mbthomas, committed by ).

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST UPDATE
  https://phab.mercurial-scm.org/D1380?vs=3513&id=3612

REVISION DETAIL
  https://phab.mercurial-scm.org/D1380

AFFECTED FILES
  mercurial/dirstate.py

CHANGE DETAILS




To: mbthomas, #hg-reviewers, durin42
Cc: durin42, mercurial-devel

Patch

diff --git a/mercurial/dirstate.py b/mercurial/dirstate.py
--- a/mercurial/dirstate.py
+++ b/mercurial/dirstate.py
@@ -127,8 +127,7 @@ 
 
     @propertycache
     def _map(self):
-        '''Return the dirstate contents as a map from filename to
-        (state, mode, size, time).'''
+        """Return the dirstate contents (see documentation for dirstatemap)."""
         self._map = dirstatemap(self._ui, self._opener, self._root)
         return self._map
 
@@ -1196,6 +1195,44 @@ 
         self._opener.unlink(backupname)
 
 class dirstatemap(object):
+    """Map encapsulating the dirstate's contents.
+
+    The dirstate contains the following state:
+
+    - `identity` is the identity of the dirstate file, which can be used to
+      detect when changes have occurred to the dirstate file.
+
+    - `parents` is a pair containing the parents of the working copy. The
+      parents are updated by calling `setparents`.
+
+    - the state map maps filenames to tuples of (state, mode, size, mtime),
+      where state is a single character representing 'normal', 'added',
+      'removed', or 'merged'. It is accessed by treating the dirstate as a
+      dict.
+
+    - `copymap` maps destination filenames to their source filename.
+
+    The dirstate also provides the following views onto the state:
+
+    - `nonnormalset` is a set of the filenames that have state other
+      than 'normal', or are normal but have an mtime of -1 ('normallookup').
+
+    - `otherparentset` is a set of the filenames that are marked as coming
+      from the second parent when the dirstate is currently being merged.
+
+    - `dirs` is a set-like object containing all the directories that contain
+      files in the dirstate, excluding any files that are marked as removed.
+
+    - `filefoldmap` is a dict mapping normalized filenames to the denormalized
+      form that they appear as in the dirstate.
+
+    - `dirfoldmap` is a dict mapping normalized directory names to the
+      denormalized form that they appear as in the dirstate.
+
+    Once instantiated, the nonnormalset, otherparentset, dirs, filefoldmap and
+    dirfoldmap views must be maintained by the caller.
+    """
+
     def __init__(self, ui, opener, root):
         self._ui = ui
         self._opener = opener