Permalink
Fetching contributors…
Cannot retrieve contributors at this time
96 lines (84 sloc) 2.08 KB
\begin{code}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE CPP #-}
#if __GLASGOW_HASKELL__ >= 800
{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
#endif
module Text.RE.Tools.Sed
(
-- * Sed
-- $tutorial
sed
, sed'
-- * Edit
, Edits(..)
, Edit(..)
, LineEdit(..)
, applyEdits
, applyEdit
, applyLineEdit
-- * IsRegex
, IsRegex(..)
, SearchReplace(..)
, searchReplaceAll
, searchReplaceFirst
-- * LineNo
, LineNo(..)
, firstLine
, getLineNo
, lineNo
-- * Replace
, module Text.RE.Replace
) where
import qualified Data.ByteString.Lazy.Char8 as LBS
import Prelude.Compat
import Text.RE.Replace
import Text.RE.Tools.Edit
\end{code}
\begin{code}
-- | read a file, apply an 'Edits' script to each line it and
-- write the file out again; "-" is used to indicate standard input
-- standard output as appropriate
sed :: IsRegex re LBS.ByteString
=> Edits IO re LBS.ByteString
-> FilePath
-> FilePath
-> IO ()
sed escr i_fp o_fp = do
lns <- LBS.lines <$> read_file i_fp
lns' <- sequence
[ applyEdits lno escr s
| (lno,s)<-zip [firstLine..] lns
]
write_file o_fp $ LBS.concat lns'
\end{code}
\begin{code}
-- | apply an 'Edits' script to each line of the argument text
sed' :: (IsRegex re a,Monad m,Functor m)
=> Edits m re a
-> a
-> m a
sed' escr t = do
mconcat <$> sequence
[ applyEdits lno escr s
| (lno,s)<-zip [firstLine..] $ linesR t
]
\end{code}
\begin{code}
read_file :: FilePath -> IO LBS.ByteString
read_file "-" = LBS.getContents
read_file fp = LBS.readFile fp
write_file :: FilePath -> LBS.ByteString ->IO ()
write_file "-" = LBS.putStr
write_file fp = LBS.writeFile fp
\end{code}
\begin{code}
-- $tutorial
-- The Sed toolkit applyies @Edits@ scripts to each line
-- of a text, running the actions and adjusting each line
-- accordingly.
--
-- See the Regex Tools tutorial at http://re-tutorial-tools.regex.uk
\end{code}