From 5b1fae50185a05b9f432190c8b995648361103d6 Mon Sep 17 00:00:00 2001
From: Maxim Lihachev <envrm@yandex.ru>
Date: Fri, 30 Sep 2016 12:52:55 +0500
Subject: [PATCH] v0.2

---
 level.hs | 82 ++++++++++++++++++++++++++++++++++++++--------------------------
 1 file changed, 49 insertions(+), 33 deletions(-)

diff --git a/level.hs b/level.hs
index 22b065d..4620775 100644
--- a/level.hs
+++ b/level.hs
@@ -1,16 +1,21 @@
+{-# LANGUAGE DeriveDataTypeable, RecordWildCards #-}
+
 -- Создан:  Ср 28 сен 2016 10:18:53
--- Изменен: Чт 29 сен 2016 18:50:35
+-- Изменен: Пт 30 сен 2016 12:52:29
 
-import System.Console.CmdArgs.Explicit
+import System.Console.CmdArgs
 import System.Environment
 import System.Directory
+import Control.Monad
 import Data.WAVE
+import Data.Char
 import Data.List
 import Data.List.Split
 
 -- =============================================================================
 
 -- Среднее значение списка
+median :: Fractional a => [a] -> a
 median l = let (t,n) = foldl' (\(b,c) a -> (a+b,c+1)) (0,0) l in t/n
 
 -- =============================================================================
@@ -21,14 +26,14 @@ audioread file = map samplesToDouble (waveSamples file)
 	where samplesToDouble (l:r:[]) = [sampleToDouble l, sampleToDouble r]
 
 --Выбор канала из пары
-channel :: [Char] -> [[Double]] -> [Double]
-channel ch (xs) = map selectChannel xs where
+getChannel :: [Char] -> [[Double]] -> [Double]
+getChannel ch (xs) = map selectChannel xs where
 	selectChannel (l:r:[])  | ch == "R" = r
 				| ch == "L" = l
 				| otherwise  = l
 
 -- Вычисление уровня сигнала
--- calcLevel :: Int -> [Double] -> Int
+calcLevel :: Int -> [Double] -> Int
 calcLevel fs samples = case dd of
 		[] -> -52 -- Неслышимый звук
 		_  -> round (median dd)
@@ -39,6 +44,7 @@ calcLevel fs samples = case dd of
 		slices = splitWhen (== 0) $ take fs samples;
 
 -- Вычисление значения фазы
+calcPhase :: (Ord a, Fractional a) => [[a]] -> a
 calcPhase samples = 2 * median (map ph (zip3 samples (drop 1 samples) (drop 2 samples))) - 1 where
 	ph ([0,0], [l2,r2], [l3,r3])    | (signum l2 /= signum r2) && (signum l3 /= signum r3) = 0
 					| otherwise = 1
@@ -52,35 +58,45 @@ calcPhase samples = 2 * median (map ph (zip3 samples (drop 1 samples) (drop 2 sa
 
 -- =============================================================================
 
--- Справка по использованию
-usage bin = mapM_ putStrLn [
-	"Использование: " ++ bin ++ " [функция] file.wav [параметры]"
-	"Функции:",
-	"          -samples N file.wav CH     - вывод Ν сэмплов канала CH (L или R)",
-	"          -level   N file.wav        - расчёт уровня сигнала по N сэмплам",
-	"          -phase   N file.wav        - расчёт значения фазы по N сэмплам"]
+-- Параметры
+data Audioread = Audioread {
+		info    :: String,
+		samples :: Int,
+		channel :: String,
+		file    :: String,
+		title   :: Int
+	} deriving (Show, Data,Typeable)
+
+-- Стандартные значения и описания параметров
+defaultOptions :: IO Audioread
+defaultOptions = cmdArgs $ Audioread {
+			file    = "none" &= typ  "FILE.WAV" &= help "File for analysis",
+			info    = "none" &= typ  "samples,phase,level" &= help "Type of information",
+			samples = 1200   &= typ  "12000"    &= help "Number of samples for analysis",
+			channel = "L"    &= typ  "L/R"      &= help "Channel from stereo stream",
+			title   = 0      &= typ  "1/0"      &= help "File for analysis"
+		} &= summary "audioread v0.2: information about audiofiles"
 
 main :: IO ()
 main = do
-	bin <- getProgName
-	cmd <- getArgs
-	if (cmd /= [] && isInfixOf ".wav" (cmd!!2)) then do
-		w <- getWAVEFile (cmd!!2)
-		let s = read (cmd!!1) :: Int
-		case cmd of
-			-- Вывод сэмплов аудиофайла
-			["-samples", samples, file, ch] ->
-				mapM_ print $ channel ch (take s (audioread w))
-			-- Вывод уровня сигнала для левого и правого каналов
-			["-level",  samples, file] -> do
-				print $ calcLevel s (channel "L" (take s (audioread w)))
-				print $ calcLevel s (channel "R" (take s (audioread w)))
-			-- Вывод значения фазы
-			["-phase", samples, file] -> 
-				print $ calcPhase (take s (audioread w))
-			-- Справка по использованию
-			_ ->
-				usage bin
-	else
-		usage bin
+	args <- getArgs
+	cmd <- (if null args then withArgs ["--help"] else id) defaultOptions
+
+	if (isInfixOf ".wav" $ file cmd) then do
+		d <- getWAVEFile $ file cmd
+		let w = take (samples cmd) (audioread d)
+
+		let exec fx = do
+			when ((title cmd) == 1) $ putStrLn $ "\n---[ " ++ fx ++ " ]:"
+			case fx of
+				"samples" -> mapM_ print $ getChannel (map toUpper $ channel cmd) w
+				"phase"   -> print $ calcPhase w
+				"level"   -> do
+						print $ calcLevel (samples cmd) (getChannel "L" w)
+						print $ calcLevel (samples cmd) (getChannel "R" w)
+				_         -> putStrLn $ "WARNING: Unknown type of information: " ++ fx ++ "\n"
+
+		mapM_ exec (splitOn "," $ info cmd)
+	else do
+		putStrLn "ERROR: You must specify a correct filename."