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module FilenameDescr where
import Data.Either
import Utils
import Tar
-- We can't just compare plain filenames, because versions numbers of GHC
-- and the libaries will vary. So we use FilenameDescr instead, which
-- abstracts out the version numbers.
type FilenameDescr = [FilenameDescrBit]
data FilenameDescrBit = VersionOf String
| FP String
deriving (Show, Eq, Ord)
normalise :: FilenameDescr -> FilenameDescr
normalise [] = []
normalise [x] = [x]
normalise (FP x1 : FP x2 : xs) = normalise (FP (x1 ++ x2) : xs)
normalise (x : xs) = x : normalise xs
-- Mapping from thing (e.g. "Cabal") to version (e.g. "1.10.0.0")
type ThingVersionMap = [(String, String)]
addThingVersion :: ThingVersionMap -> String -> String -> Maybe ThingVersionMap
addThingVersion mapping thing version
= case lookup thing mapping of
Just version' ->
if version == version'
then Just mapping
else Nothing
Nothing ->
Just ((thing, version) : mapping)
-- Sanity check that the FilenameDescr matches the filename in the tar line
checkContent :: ThingVersionMap -> (FilenameDescr, TarLine) -> Errors
checkContent mapping (fd, tl)
= let fn = tlFileName tl
in case flattenFilenameDescr mapping fd of
Right fn' ->
if fn' == fn
then []
else ["checkContent: Can't happen: filename mismatch: " ++ show fn]
Left errs ->
errs
flattenFilenameDescr :: ThingVersionMap -> FilenameDescr
-> Either Errors FilePath
flattenFilenameDescr mapping fd = case partitionEithers (map f fd) of
([], strs) -> Right (concat strs)
(errs, _) -> Left (concat errs)
where f (FP fp) = Right fp
f (VersionOf thing)
= case lookup thing mapping of
Just v -> Right v
Nothing -> Left ["Can't happen: thing has no version in mapping"]
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