module Ganeti.HTools.Utils
(
debug
, sepSplit
, fst3
, varianceCoeff
, commaJoin
, readEitherString
, loadJSArray
, fromObj
, tryFromObj
, fromJVal
, asJSObject
, asObjectList
, fromJResult
, tryRead
, formatTable
, annotateResult
) where
import Data.List
import qualified Text.JSON as J
import Text.Printf (printf)
import Debug.Trace
import Ganeti.HTools.Types
debug :: Show a => a -> a
debug x = trace (show x) x
commaJoin :: [String] -> String
commaJoin = intercalate ","
sepSplit :: Char -> String -> [String]
sepSplit sep s
| x == "" && xs == [] = []
| xs == [] = [x]
| ys == [] = [x,""]
| otherwise = x:sepSplit sep ys
where (x, xs) = break (== sep) s
ys = drop 1 xs
fst3 :: (a, b, c) -> a
fst3 (a, _, _) = a
varianceCoeff :: [Double] -> Double
varianceCoeff lst =
let ll = fromIntegral (length lst)::Double
mv = sum lst / ll
av = foldl' (\accu em -> let d = em mv in accu + d * d) 0.0 lst
bv = sqrt (av / ll)
cv = bv / ll
in cv
fromJResult :: Monad m => J.Result a -> m a
fromJResult (J.Error x) = fail x
fromJResult (J.Ok x) = return x
readEitherString :: (Monad m) => J.JSValue -> m String
readEitherString v =
case v of
J.JSString s -> return $ J.fromJSString s
_ -> fail "Wrong JSON type"
loadJSArray :: (Monad m) => String -> m [J.JSObject J.JSValue]
loadJSArray = fromJResult . J.decodeStrict
fromObj :: (J.JSON a, Monad m) => String -> [(String, J.JSValue)] -> m a
fromObj k o =
case lookup k o of
Nothing -> fail $ printf "key '%s' not found in %s" k (show o)
Just val -> fromJResult $ J.readJSON val
annotateResult :: String -> Result a -> Result a
annotateResult owner (Bad s) = Bad $ owner ++ ": " ++ s
annotateResult _ v = v
tryFromObj :: (J.JSON a) =>
String -> [(String, J.JSValue)] -> String -> Result a
tryFromObj t o k = annotateResult (t ++ " key '" ++ k ++ "'") (fromObj k o)
fromJVal :: (Monad m, J.JSON a) => J.JSValue -> m a
fromJVal v =
case J.readJSON v of
J.Error s -> fail ("Cannot convert value " ++ show v ++ ", error: " ++ s)
J.Ok x -> return x
asJSObject :: (Monad m) => J.JSValue -> m (J.JSObject J.JSValue)
asJSObject (J.JSObject a) = return a
asJSObject _ = fail "not an object"
asObjectList :: (Monad m) => [J.JSValue] -> m [J.JSObject J.JSValue]
asObjectList = mapM asJSObject
parseChoices :: (Monad m, Read a) => String -> String -> [(a, String)] -> m a
parseChoices _ _ ((v, ""):[]) = return v
parseChoices name s ((_, e):[]) =
fail $ name ++ ": leftover characters when parsing '"
++ s ++ "': '" ++ e ++ "'"
parseChoices name s _ = fail $ name ++ ": cannot parse string '" ++ s ++ "'"
tryRead :: (Monad m, Read a) => String -> String -> m a
tryRead name s = parseChoices name s $ reads s
formatTable :: [[String]] -> [Bool] -> [[String]]
formatTable vals numpos =
let vtrans = transpose vals
mlens = map (maximum . map length) vtrans
expnd = map (\(flds, isnum, ml) ->
map (\val ->
let delta = ml length val
filler = replicate delta ' '
in if delta > 0
then if isnum
then filler ++ val
else val ++ filler
else val
) flds
) (zip3 vtrans numpos mlens)
in transpose expnd