pre-commit-annex hook script to automatically extract metadata from lots of types of files

Using the extract(1) program to do the heavy lifting.

Decided to make git-annex run pre-commit-annex when committing. Since
git-annex pre-commit also runs it, it'll be run when git commit is run too,
via the pre-commit hook. This basically gives back the pre-commit hook
that git-annex took away. The implementation avoids repeatedly looking
for the hook script when the assistant is running and committing
repeatedly; only checks if the hook is available once.

To make the script simpler, made git-annex metadata -s field?=value
only set a field when it's not already got a value.

This commit was sponsored by bak.
This commit is contained in:
Joey Hess 2014-03-02 18:01:07 -04:00
parent 34059c09e2
commit d0fce426c4
12 changed files with 152 additions and 16 deletions

View file

@ -219,6 +219,7 @@ data ModMeta
= AddMeta MetaField MetaValue
| DelMeta MetaField MetaValue
| SetMeta MetaField MetaValue -- removes any existing values
| MaybeSetMeta MetaField MetaValue -- when field has no existing value
{- Applies a ModMeta, generating the new MetaData.
- Note that the new MetaData does not include all the
@ -229,12 +230,16 @@ modMeta _ (DelMeta f oldv) = updateMetaData f (unsetMetaValue oldv) emptyMetaDat
modMeta m (SetMeta f v) = updateMetaData f v $
foldr (updateMetaData f) emptyMetaData $
map unsetMetaValue $ S.toList $ currentMetaDataValues f m
modMeta m (MaybeSetMeta f v)
| S.null (currentMetaDataValues f m) = updateMetaData f v emptyMetaData
| otherwise = emptyMetaData
{- Parses field=value, field+=value, field-=value -}
{- Parses field=value, field+=value, field-=value, field?=value -}
parseModMeta :: String -> Either String ModMeta
parseModMeta p = case lastMaybe f of
Just '+' -> AddMeta <$> mkMetaField f' <*> v
Just '-' -> DelMeta <$> mkMetaField f' <*> v
Just '?' -> MaybeSetMeta <$> mkMetaField f' <*> v
_ -> SetMeta <$> mkMetaField f <*> v
where
(f, sv) = separate (== '=') p