views: add automatically constructed file location metadata

When constructing views, metadata is available about the location of the
file in the view's reference branch. Allows incorporating parts of the
directory hierarchy in a view.

For example `git annex view tag=* podcasts/=*` makes a view in the form
tag/showname.

Performance impact: I benchmarked git annex view tag=* in the conference
proceedings repo to take 6.459s before this change, and 6.544s after.

FWIW, I considered making the syntax for this be podcasts/*, which might
be easier for the user to learn. However, I think it's not as good:

* The user has to then juggle two different syntaxes, and podcasts/* will
  be expanded by the shell so they also need to quote it, while podcasts/=*
  is unlikely to be expanded by the shell.
* It would allow for things like podcasts/*/* and *.mp3 which do not
  map well into views.

This commit was sponsored by Aurélien Pinceaux.

1 files changed, 5 insertions, 0 deletions

diff --git a/debian/changelog b/debian/changelog
index 37193891a..4d5589ed0 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -4,6 +4,11 @@ git-annex (5.20140222) UNRELEASED; urgency=medium
     including rsync.net.
   * --metadata field=value can now use globs to match, and matches
     case insensatively, the same as git annex view field=value does.
+  * When constructing views, metadata is available about the location of the
+    file in the view's reference branch. Allows incorporating parts of the
+    directory hierarchy in a view.
+    For example `git annex view tag=* podcasts/=*` makes a view in the form
+    tag/showname.
 
  -- Joey Hess <joeyh@debian.org>  Fri, 21 Feb 2014 13:03:04 -0400