Added adjmix

1 files changed, 71 insertions, 0 deletions

diff --git a/adjmix/Adjmix.hs b/adjmix/Adjmix.hs
new file mode 100644
index 0000000..49b820f
--- /dev/null
+++ b/adjmix/Adjmix.hs
@@ -0,0 +1,71 @@
+{-# LANGUAGE RecordWildCards #-}
+
+import Options.Applicative
+
+import System.FilePath
+
+import Data.Char
+
+import Trivmix.Types
+
+data Options = Options
+               { baseDirectory :: FilePath
+               , targetDirectory :: FilePath
+               , levelFile :: FilePath
+               , adjustment :: Adjustment Level
+               }
+optionParser :: Parser Options
+optionParser = Options
+               <$> strOption ( long "base"
+                               <> metavar "DIRECTORY"
+                               <> value "/dev/shm/mix"
+                             )
+               <*> strOption ( long "target"
+                               <> short 't'
+                               <> metavar "DIRECTORY"
+                               <> help "Directory relative to ‘--base’ containing the level file"
+                             )
+               <*> strOption ( long "level"
+                               <> metavar "FILENAME"
+                               <> value "level"
+                               <> help "Filename of the level file"
+                             )
+               <*> ( ( Set <$> option auto ( long "set"
+                                             <> short 'o'
+                                             <> metavar "LEVEL"
+                                           )
+                     )
+                     <|> ( Add <$> option auto ( long "add"
+                                                 <> short 'a'
+                                                 <> metavar "LEVEL"
+                                               )
+                         )
+                     <|> ( Sub <$> option auto ( long "sub"
+                                                 <> short 's'
+                                                 <> metavar "LEVEL"
+                                               )
+                         )
+                   )
+
+main :: IO ()
+main = execParser opts >>= adjmix
+  where
+    opts = info (helper <*> optionParser)
+           ( fullDesc
+             <> progDesc "Adjust the level file of a trivmix"
+             <> header "Adjmix — A trivial interface to a trivial mixer"
+           )
+
+adjmix :: Options -> IO ()
+adjmix Options{..} = do
+  oldLevel <- readFile levelFile >>= readIO . stripSpace
+  let
+    newLevel = oldLevel `doAdjustment` adjustment
+  writeFile levelFile (show newLevel ++ "\n")
+  where
+    levelFile = baseDirectory </> targetDirectory </> levelFile
+    stripSpace = reverse . stripSpace' . reverse . stripSpace'
+    stripSpace' [] = []
+    stripSpace' l@(x:xs) = if isSpace x
+                          then stripSpace' xs
+                          else l