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views: add automatically constructed file location metadata

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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.
This commit is contained in:
Joey Hess 2014-02-22 16:09:00 -04:00
commit 079b35a1a8
8 changed files with 89 additions and 25 deletions
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2
Command/View.hs
View file

@ -43,7 +43,7 @@ perform view = do
next $ checkoutViewBranch view applyView
paramView :: String
paramView = paramPair (paramRepeating "FIELD=VALUE") (paramRepeating "TAG")
paramView = paramPair (paramRepeating "TAG") (paramRepeating "FIELD=VALUE")
parseViewParam :: String -> (MetaField, String)
parseViewParam s = case separate (== '=') s of