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Don't write out the cabal file if it matches the old one #555

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Don't write out the cabal file if it matches the old one #555

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7 changes: 4 additions & 3 deletions src/Hpack.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -248,7 +248,7 @@ hpackResultWithVersion v (Options options force generateHashStrategy toStdout) =
NoForce -> maybe Generated (mkStatus newCabalFile) mExistingCabalFile

case status of
Generated -> writeCabalFile options toStdout cabalFileName newCabalFile
Generated -> writeCabalFile options toStdout cabalFileName mExistingCabalFile newCabalFile
_ -> return ()

return $ Right Result {
Expand All @@ -258,8 +258,9 @@ hpackResultWithVersion v (Options options force generateHashStrategy toStdout) =
}
Left err -> return $ Left err

writeCabalFile :: DecodeOptions -> Bool -> FilePath -> CabalFile -> IO ()
writeCabalFile options toStdout name cabalFile = do
writeCabalFile :: DecodeOptions -> Bool -> FilePath -> Maybe CabalFile -> CabalFile -> IO ()
writeCabalFile _ _ _ (Just oldCabalFile) newCabalFile | oldCabalFile == newCabalFile = mempty
writeCabalFile options toStdout name _ cabalFile = do
write . unlines $ renderCabalFile (decodeOptionsTarget options) cabalFile
where
write = if toStdout then Utf8.putStr else Utf8.writeFile name
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