hgrep

Search Haskell source code from the command line.

Powered by ghc-exactprint.

Usage

$> hgrep
Usage: hgrep [-e|--regex] EXPRESSION [FILE]

hgrep requires an expression and a set of files to search across.

An expression can be one of

• The name of a type, e.g. FooBar
• The name of an expression, e.g. foo
• A regular expression (via the -e flag), e.g. -e Foo$

Each file will be parsed and searched. Results will be printed to the console, with syntax highlighting where possible.

Searching for top-level expressions

$> hgrep main main/hgrep.hs
main/hgrep.hs:16:1-13
-- | Run the program.
main :: IO ()
main/hgrep.hs:(17,1)-(18:27)
main = do
  putStrLn "Hello, world!"

Searching for type declarations

$> hgrep PrintOpts src/**/*.hs
src/Language/Haskell/HGrep/Internal/Data.hs:(40,1)-(42,28)
data PrintOpts = PrintOpts {
    poColourOpts :: ColourOpts
  } deriving (Eq, Ord, Show)

Searching with a regular expression

$> hgrep -e 'Opts$' src/**/*.hs
src/Language/Haskell/HGrep/Internal/Data.hs:(57,1)-(59,28)
data PrintOpts = PrintOpts {
    poColourOpts :: ColourOpts
  } deriving (Eq, Ord, Show)
src/Language/Haskell/HGrep/Internal/Data.hs:(61,1)-(64,26)
defaultPrintOpts :: PrintOpts
src/Language/Haskell/HGrep/Internal/Data.hs:(67,1)-(70,5)
defaultPrintOpts =
  PrintOpts {
      poColourOpts = DefaultColours
    }