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67 lines
2.1 KiB
67 lines
2.1 KiB
#!/usr/bin/env stack
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{- stack --resolver lts-18.14 script
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--package text
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--package unordered-containers
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--package tagsoup
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--package filepath
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--package hashable
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-}
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{-# LANGUAGE OverloadedStrings #-}
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module Main where
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import qualified Data.Text.Lazy.IO as Text
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import qualified Data.HashSet as HashSet
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import qualified Data.Text.Lazy as Text
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import Data.HashSet (HashSet)
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import Data.Text.Lazy (Text)
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import Data.Hashable
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import System.Environment
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import Text.HTML.TagSoup
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import Data.Function
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import Data.Int
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import Data.Foldable
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import System.FilePath
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import Control.Monad
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main :: IO ()
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main = do
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args <- getArgs
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for_ args $ \mod -> do
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contents <- Text.readFile mod
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let unused = findUnusedImports mempty (parseTags contents)
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unless (null unused) $ do
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putStrLn $ "Potentially unused imports for: \x1b[1m" <> dropExtension (takeFileName mod) <> "\x1b[0m"
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Text.putStrLn $ " * " <> Text.intercalate ", " (toList unused)
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findUnusedImports :: HashSet Text -> [Tag Text] -> HashSet Text
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findUnusedImports unused (TagOpen "pre" attrs:ts)
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| Just "Agda" <- lookup "class" attrs
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= goAgda 0 unused ts
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findUnusedImports unused (_:ts) = findUnusedImports unused ts
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findUnusedImports unused [] = unused
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goAgda :: Int64 -> HashSet Text -> [Tag Text] -> HashSet Text
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goAgda line unused (TagOpen "a" attrs:TagText text:TagClose "a":ts)
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| Just "Module" <- lookup "class" attrs
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, Just href <- lookup "href" attrs
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, ".html" `Text.isSuffixOf` href
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= let
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imp = Text.take (Text.length href - 5) href
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in goAgda line (HashSet.insert imp unused) ts
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| Just href <- lookup "href" attrs
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, let (mod, ident) = Text.break (== '#') href
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, not (Text.null mod), not (Text.null (Text.drop 1 ident))
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= let
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imp = Text.take (Text.length mod - 5) mod
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in goAgda line (HashSet.delete imp unused) ts
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goAgda line unused (TagClose "pre":ts) = findUnusedImports unused ts
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goAgda line unused (TagText text:ts)
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| newlines <- Text.filter (== '\n') text = goAgda (line + Text.length newlines) unused ts
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goAgda line unused (t:ts) = goAgda line unused ts
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goAgda line unused [] = error "Unclosed <pre class=Agda> tag"
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