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printpatterns.hs
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printpatterns.hs
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import Slonimsky
import Control.Monad
import Euterpea
import System.Console.GetOpt
import System.Environment -- getArgs
import System.IO -- isEOF
import System.Exit -- exitSuccess
-- compile with ./build.sh printpatterns.hs
-- example usage:
-- echo '(C,4) 4 [-6,-2,2]' | ./printpatterns -n 24 -s
-- print C major scale:
-- echo '(C,4) 0 [2,2,1,2,2,2,1]' | ./printpatterns -n 8
-- for more on getOpt usage, look here:
-- http://hackage.haskell.org/package/base-4.8.1.0/docs/System-Console-GetOpt.html
data Opts = Opts {slnm :: Bool, nNotes :: Int} deriving (Show)
defaultOpts = Opts {slnm = False, nNotes = 12}
options :: [OptDescr (Opts -> Opts)]
options =
[ Option ['s'] ["slonimsky"]
(NoArg (\o -> o {slnm = True})) "output Slonimsky pattern"
, Option ['n'] ["numnotes"]
(ReqArg (\n o -> o {nNotes = read n :: Int}) "NUM")
"number of notes to output"
]
parseOpts :: [String] -> IO ([Opts -> Opts], [String])
parseOpts args =
case getOpt RequireOrder options args of
(opts,leftover,[]) -> return (opts,leftover)
(_,_,errs) -> fail (concat errs ++ usageInfo header options)
where header = "Usage: printpatterns [options]"
-- XXX replace program name with $0 from environment
-- XXX actually, it would probably be more useful to have the pattern
-- type as well as the number of notes read from each line :\
processOpts :: [Opts -> Opts] -> Opts
processOpts opts = foldr ($) defaultOpts opts
main = do
args <- getArgs
(optList,leftover) <- parseOpts args
let opts = processOpts optList
forever $ do
eof <- isEOF
if eof then exitSuccess
else do
line <- getLine
let (p,i,l) = parsePattern line
print $ take (nNotes opts) $ (patGen $ slnm opts) p i l
where
patGen True = slonimsky
patGen False = (\a b c -> intervalScale a (toEnum b) c)
parsePattern :: String -> (Pitch, Int, [Int])
parsePattern s = (p,i,l)
where (l,_) = head (reads k :: [([Int],String)])
(i,k) = head (reads h :: [(Int,String)])
(p,h) = head (reads s :: [(Pitch,String)])