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Synopsis |
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Obtaining Trees.
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Please note that Trees obtained this way will contain Stub
items. These need to be executed (they are IO actions) in order to be
accessed. Use expand to do this. However, many operations are
perfectly fine to be used on a stubbed Tree (and it is often more
efficient to do everything that can be done before expanding a Tree).
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Read in a plain directory hierarchy from a filesystem. NB. The read
function on Blobs with such a Tree is susceptible to file content
changes. Since we use mmap in read, this will break referential
transparency and produce unexpected results. Please always make sure that
all parallel access to the underlying filesystem tree never mutates
files. Unlink + recreate is fine though (in other words, the sync/write
operations below are safe).
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Read in a darcs-style hashed tree. This is mainly useful for reading
"pristine.hashed". You need to provide the root hash you are interested in
(found in _darcs/hashed_inventory).
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Read in a darcs pristine tree. Handles the plain and hashed pristine
cases. Does not (and will not) handle the no-pristine case, since that
requires replaying patches. Cf. readDarcsHashed and readPlainTree that
are used to do the actual Tree construction.
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Blob access.
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Read a Blob into a Lazy ByteString. Might be backed by an mmap, use with
care.
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Read in a FileSegment into a Lazy ByteString. Implemented using mmap.
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Writing trees.
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Write out *full* tree to a plain directory structure. If you instead want
to make incremental updates, refer to Monad.plainTreeIO.
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Unsafe functions for the curious explorer.
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These are more useful for playing within ghci than for real, serious
programs. They generally trade safety for conciseness. Please use
responsibly. Don't kill innocent kittens.
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Take a relative FilePath and turn it into an AnchoredPath. The operation
is unsafe and if you break it, you keep both pieces. More useful for
exploratory purposes (ghci) than for serious programming.
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Take a relative FilePath within a Tree and print the contents of the
object there. Useful for exploration, less so for serious programming.
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Produced by Haddock version 2.4.2 |