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| author |  Joey Hess <joey@kitenet.net> | 2014-03-18 18:55:43 -0400 |
|---|---|---|
| committer | Joey Hess <joey@kitenet.net> | 2014-03-18 18:55:43 -0400 |
| commit | 2402266d0d9731445af1876327a43795795d1a18 (patch) | |
| tree | 2f52191002e8ee79275c2f4e6070b057a61f9389 /Types/MetaData.hs | |
| parent | 9adb236103d0b8f1db8110b40cc33b9fe5fda4ae (diff) | |
Each for each metadata field, there's now an automatically maintained "$field-lastchanged" that gives the timestamp of the last change to that field.
Note that this is a nearly entirely free feature. The data was already
stored in the metadata log in an easily accessible way, and already was
parsed to a time when parsing the log. The generation of the metadata
fields may even be done lazily, although probably not entirely (the map
has to be evaulated to when queried).
Diffstat (limited to 'Types/MetaData.hs')
| -rw-r--r-- | Types/MetaData.hs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Types/MetaData.hs b/Types/MetaData.hs index c37b31c51..70b5bd840 100644 --- a/Types/MetaData.hs +++ b/Types/MetaData.hs @@ -28,6 +28,7 @@ module Types.MetaData ( emptyMetaData, updateMetaData, unionMetaData, + combineMetaData, differenceMetaData, isSet, currentMetaData, @@ -188,6 +189,9 @@ unionMetaData :: MetaData -> MetaData -> MetaData unionMetaData (MetaData old) (MetaData new) = MetaData $ M.unionWith S.union new old +combineMetaData :: [MetaData] -> MetaData +combineMetaData = foldl' unionMetaData emptyMetaData + differenceMetaData :: MetaData -> MetaData -> MetaData differenceMetaData (MetaData m) (MetaData excludem) = MetaData $ M.differenceWith diff m excludem |