mirror of
https://github.com/github/semantic.git
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61 lines
2.3 KiB
Haskell
61 lines
2.3 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 Parser as P
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import Syntax
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import Range
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import Split
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import Term
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import Unified
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import Control.Comonad.Cofree
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import qualified Data.ByteString.Char8 as B1
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import qualified Data.ByteString.Lazy as B2
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import Options.Applicative
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import System.FilePath
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data Output = Unified | Split
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data Argument = Argument { output :: Output, sourceA :: FilePath, sourceB :: FilePath }
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arguments :: Parser Argument
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arguments = Argument
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<$> (flag Split Unified (long "unified" <> help "output a unified diff")
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<|> flag' Split (long "split" <> help "output a split diff"))
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<*> argument str (metavar "FILE a")
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<*> argument str (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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aContents <- readFile sourceAPath
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bContents <- readFile sourceBPath
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(aTerm, bTerm) <- let parse = (P.parserForType . takeExtension) sourceAPath in do
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aTerm <- parse aContents
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bTerm <- parse bContents
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return (replaceLeavesWithWordBranches aContents aTerm, replaceLeavesWithWordBranches bContents bTerm)
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let diff = interpret comparable aTerm bTerm in
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case output arguments of
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Unified -> do
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output <- unified diff aContents bContents
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B1.putStr output
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Split -> do
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output <- split diff aContents bContents
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B2.putStr output
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where
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opts = info (helper <*> arguments)
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(fullDesc <> progDesc "Diff some things" <> header "semantic-diff - diff semantically")
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replaceLeavesWithWordBranches :: String -> Term String Info -> Term String Info
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replaceLeavesWithWordBranches source term = replaceIn source 0 term
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where
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replaceIn source startIndex (info@(Info range categories) :< syntax) | substring <- substring (offsetRange (negate startIndex) range) source = info :< case syntax of
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Leaf _ | ranges <- rangesAndWordsFrom (start range) substring, length ranges > 1 -> Indexed $ makeLeaf categories <$> ranges
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Indexed i -> Indexed $ replaceIn substring (start range) <$> i
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Fixed f -> Fixed $ replaceIn substring (start range) <$> f
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Keyed k -> Keyed $ replaceIn substring (start range) <$> k
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_ -> syntax
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makeLeaf categories (range, substring) = Info range categories :< Leaf substring
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