Congrats! I look forward to seeing how this develops.
On Sun, Sep 4, 2016 at 11:27 AM, lennart spitzner <l...@informatik.uni-kiel.de> wrote: > Greetings, > > I am happy to announce a first alpha release of brittany (0.7.0.0), > a haskell source code formatting tool based on ghc-exactprint [2] > (and thus ghc's parser). > > > https://github.com/lspitzner/brittany > > > Two small feature cases that brittany would produce/leave unmodified: > >> -- Newlines are used sparingly: Only after "do" and when the >> -- `liftBaseOpDiscard` application would lead to overflowing 80 columns. >> main :: IO () >> main = do >> pool <- createPostgresqlPool (toS databaseConnectionString) 10 >> initiate $ \chan -> forever $ do >> flip runDbConn pool $ do >> makeSureQueueIsFull chan >> void $ liftBaseOpDiscard (consumeMsgs chan responseQueue Ack) >> (uncurry processMsg) >> threadDelay 1000000 > >> -- Alignment of patterns >> go [] "" = True >> go [WildCard ] "" = True >> go (WildCard :rest) (c:cs) = go rest (c : cs) || go (WildCard : rest) cs >> go (Union globs:rest) cs = any (\glob -> go (glob ++ rest) cs) globs >> go [] (_:_) = False >> go (_:_) "" = False > > > Yet this is an alpha release, for the following reasons: > > - Brittany currently only transforms top-level type signatures and (function) > bindings. > - Not all syntactical constructs (even of plain 2010 haskell) are understood. > All common constructs should work, but "common" is purely subjective. > - Not all (syntactic) extensions are supported, either. > - Needs more testing. > (And less than a hundred automated testcases is not very much to explore > every syntactic corner of haskell.) > > On the other hand > > - I have started using the tool successfully, albeit selectively. > - There are checks in place that detect > 1) if output is not valid haskell or > 2) if source comments are not transcribed to the output. > That is, running into non-handled cases should lead to error messages that > are harmless, not into any silent it-overwrote-my-code-with-garbage. > > > *How to build?* > > Brittany requires ghc-8. See https://github.com/lspitzner/brittany#building > > A hackage release is not planned yet. > > > *Brittany's formatting style* > > Currently brittany does _not_ give the user many choices. A few flags exist, > most prominently to change the indentation (default 2) or the columns > (default 80). I am open to suggestions of how to improve the style, but trying > to make everyone happy is not a fulfilling goal for me. > > > *Implementation/documentation/performance* > > The implementation and its core ideas are not documented. The core algorithm > in theory has linear complexity in input size; the implementation probably is > quadratic dues to some misuses of plain lists or other such implementation > details. Providing at least a high-level overview is on my to-do list. > > > [1] https://github.com/lspitzner/brittany > [2] https://hackage.haskell.org/package/ghc-exactprint > > -- lennart > _______________________________________________ > Haskell-Cafe mailing list > To (un)subscribe, modify options or view archives go to: > http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe > Only members subscribed via the mailman list are allowed to post. _______________________________________________ Haskell mailing list Haskell@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell
