mirror of
https://github.com/github/semantic.git
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92 lines
3.8 KiB
Haskell
92 lines
3.8 KiB
Haskell
module Main where
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import Categorizable
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import Diff
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import Interpreter
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import qualified Parsers as P
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import Syntax
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import Range
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import qualified PatchOutput
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import Split
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import Term
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import Unified
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import Source
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import Control.Comonad.Cofree
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import qualified Data.ByteString.Char8 as B1
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import Options.Applicative
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import System.Directory
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import System.FilePath
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import qualified Data.Text as T
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import qualified Data.Text.Lazy.IO as TextIO
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import qualified System.IO as IO
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import qualified Data.Text.ICU.Detect as Detect
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import qualified Data.Text.ICU.Convert as Convert
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import Data.Bifunctor.Join
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-- | The available types of diff rendering.
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data Format = Unified | Split | Patch
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-- | The command line arguments to the application.
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data Arguments = Arguments { format :: Format, output :: Maybe FilePath, sourceA :: FilePath, sourceB :: FilePath }
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-- | A parser for the application's command-line arguments.
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arguments :: Parser Arguments
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arguments = Arguments
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<$> (flag Split Unified (long "unified" <> help "output a unified diff")
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<|> flag Split Patch (long "patch" <> help "output a patch(1)-compatible diff")
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<|> flag' Split (long "split" <> help "output a split diff"))
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<*> optional (strOption (long "output" <> short 'o' <> help "output directory for split diffs, defaulting to stdout if unspecified"))
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<*> strArgument (metavar "FILE a")
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<*> strArgument (metavar "FILE b")
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main :: IO ()
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main = do
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arguments <- execParser opts
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let (sourceAPath, sourceBPath) = (sourceA arguments, sourceB arguments)
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sources <- sequence $ readAndTranscodeFile <$> Join (sourceAPath, sourceBPath)
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let parse = (P.parserForType . T.pack . takeExtension) sourceAPath
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terms <- sequence $ parse <$> sources
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let replaceLeaves = breakDownLeavesByWord <$> sources
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printDiff arguments (runJoin sources) (uncurry diff $ runJoin $ replaceLeaves <*> terms)
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where opts = info (helper <*> arguments)
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(fullDesc <> progDesc "Diff some things" <> header "semantic-diff - diff semantically")
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-- | Diff two terms.
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diff :: (Eq a, Eq annotation, Categorizable annotation) => Term a annotation -> Term a annotation -> Diff a annotation
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diff = interpret comparable
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-- | Print a diff, given the command-line arguments, source files, and terms.
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printDiff :: Arguments -> (Source Char, Source Char) -> Diff T.Text Info -> IO ()
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printDiff arguments (aSource, bSource) diff = case format arguments of
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Unified -> do
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rendered <- unified diff aSource bSource
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B1.putStr rendered
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Split -> do
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rendered <- split diff aSource bSource
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case output arguments of
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Just path -> do
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isDir <- doesDirectoryExist path
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let outputPath = if isDir
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then path </> (takeFileName (sourceB arguments) -<.> ".html")
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else path
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IO.withFile outputPath IO.WriteMode (flip TextIO.hPutStr rendered)
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Nothing -> TextIO.putStr rendered
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Patch -> putStr $ PatchOutput.patch diff aSource bSource
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-- | Replace every string leaf with leaves of the words in the string.
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breakDownLeavesByWord :: Source Char -> Term T.Text Info -> Term T.Text Info
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breakDownLeavesByWord source = cata replaceIn
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where
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replaceIn info@(Info range categories) (Leaf _) | ranges <- rangesAndWordsInSource range, length ranges > 1 = info :< (Indexed $ makeLeaf categories <$> ranges)
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replaceIn info syntax = info :< syntax
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rangesAndWordsInSource range = rangesAndWordsFrom (start range) (toList $ slice range source)
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makeLeaf categories (range, substring) = Info range categories :< Leaf (T.pack substring)
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-- | Read the file and convert it to Unicode.
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readAndTranscodeFile :: FilePath -> IO (Source Char)
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readAndTranscodeFile path = fromText <$> do
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text <- B1.readFile path
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match <- Detect.detectCharset text
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converter <- Convert.open match Nothing
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return $ Convert.toUnicode converter text
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