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batchRename.hs
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batchRename.hs
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import Data.List
import Data.Maybe
import System.Directory
import System.Environment
import System.FilePath.Glob
import System.FilePath
usage :: IO ()
usage = do progName <- getProgName
putStrLn ("Usage:\n\t" ++ progName ++ " \"srcPattern\" \"dstPattern\"")
hasWildcard :: String -> Bool
hasWildcard name = 1 == length (filter (== '*') name)
trimHeadTail s pre pos = let
nohead = drop (length pre) s in
reverse (drop (length pos) (reverse nohead))
partRename preL posL preR posR name =
let fn = takeFileName name in
renameFile fn (preR ++
trimHeadTail fn preL posL ++
posR)
fetchPrePos s = let idx = fromMaybe 0 (elemIndex '*' s) in
(take idx s, drop (idx + 1) s)
batchRename :: String -> String -> IO ()
batchRename left right = if hasWildcard left && hasWildcard right then
let (oldPreLeft, oldPosLeft) = fetchPrePos left
(oldPreRight, oldPosRight) = fetchPrePos right in
do files <- glob left
mapM_ (partRename oldPreLeft oldPosLeft oldPreRight oldPosRight)
files
else
putStrLn "Oops, use simple rename please."
main :: IO ()
main = do args <- System.Environment.getArgs
case args of
[l,r] -> batchRename l r
otherwise -> usage