mirror of
https://github.com/simonmichael/hledger.git
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275 lines
8.1 KiB
Haskell
275 lines
8.1 KiB
Haskell
{-|
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Provide standard imports and utilities which are useful everywhere, or
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needed low in the module hierarchy. This is the bottom of the dependency graph.
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-}
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module Ledger.Utils (
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module Char,
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module Control.Monad,
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module Data.List,
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--module Data.Map,
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module Data.Maybe,
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module Data.Ord,
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module Data.Tree,
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module Data.Time.Clock,
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module Data.Time.Calendar,
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module Data.Time.LocalTime,
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module Debug.Trace,
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module Ledger.Utils,
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module Text.Printf,
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module Text.RegexPR,
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module Test.HUnit,
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)
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where
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import Prelude hiding (readFile)
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import Char
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import Control.Exception
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import Control.Monad
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import Data.List
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--import qualified Data.Map as Map
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import Data.Maybe
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import Data.Ord
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import Data.Tree
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import Data.Time.Clock
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import Data.Time.Calendar
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import Data.Time.LocalTime
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import Debug.Trace
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import System.IO.UTF8
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import Test.HUnit
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import Text.Printf
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import Text.RegexPR
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import Text.ParserCombinators.Parsec
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-- strings
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lowercase = map toLower
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uppercase = map toUpper
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strip = lstrip . rstrip
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lstrip = dropws
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rstrip = reverse . dropws . reverse
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dropws = dropWhile (`elem` " \t")
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elideLeft width s =
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case length s > width of
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True -> ".." ++ reverse (take (width - 2) $ reverse s)
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False -> s
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elideRight width s =
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case length s > width of
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True -> take (width - 2) s ++ ".."
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False -> s
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underline :: String -> String
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underline s = s' ++ replicate (length s) '-' ++ "\n"
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where s'
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| last s == '\n' = s
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| otherwise = s ++ "\n"
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unbracket :: String -> String
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unbracket s
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| (head s == '[' && last s == ']') || (head s == '(' && last s == ')') = init $ tail s
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| otherwise = s
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-- | Join multi-line strings as side-by-side rectangular strings of the same height, top-padded.
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concatTopPadded :: [String] -> String
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concatTopPadded strs = intercalate "\n" $ map concat $ transpose padded
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where
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lss = map lines strs
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h = maximum $ map length lss
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ypad ls = replicate (difforzero h (length ls)) "" ++ ls
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xpad ls = map (padleft w) ls where w | null ls = 0
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| otherwise = maximum $ map length ls
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padded = map (xpad . ypad) lss
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-- | Join multi-line strings as side-by-side rectangular strings of the same height, bottom-padded.
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concatBottomPadded :: [String] -> String
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concatBottomPadded strs = intercalate "\n" $ map concat $ transpose padded
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where
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lss = map lines strs
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h = maximum $ map length lss
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ypad ls = ls ++ replicate (difforzero h (length ls)) ""
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xpad ls = map (padleft w) ls where w | null ls = 0
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| otherwise = maximum $ map length ls
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padded = map (xpad . ypad) lss
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-- | Convert a multi-line string to a rectangular string top-padded to the specified height.
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padtop :: Int -> String -> String
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padtop h s = intercalate "\n" xpadded
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where
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ls = lines s
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sh = length ls
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sw | null ls = 0
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| otherwise = maximum $ map length ls
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ypadded = replicate (difforzero h sh) "" ++ ls
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xpadded = map (padleft sw) ypadded
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-- | Convert a multi-line string to a rectangular string bottom-padded to the specified height.
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padbottom :: Int -> String -> String
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padbottom h s = intercalate "\n" xpadded
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where
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ls = lines s
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sh = length ls
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sw | null ls = 0
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| otherwise = maximum $ map length ls
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ypadded = ls ++ replicate (difforzero h sh) ""
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xpadded = map (padleft sw) ypadded
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-- | Convert a multi-line string to a rectangular string left-padded to the specified width.
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padleft :: Int -> String -> String
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padleft w "" = concat $ replicate w " "
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padleft w s = intercalate "\n" $ map (printf (printf "%%%ds" w)) $ lines s
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-- | Convert a multi-line string to a rectangular string right-padded to the specified width.
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padright :: Int -> String -> String
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padright w "" = concat $ replicate w " "
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padright w s = intercalate "\n" $ map (printf (printf "%%-%ds" w)) $ lines s
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-- | Clip a multi-line string to the specified width and height from the top left.
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cliptopleft :: Int -> Int -> String -> String
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cliptopleft w h = intercalate "\n" . take h . map (take w) . lines
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-- | Clip and pad a multi-line string to fill the specified width and height.
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fitto :: Int -> Int -> String -> String
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fitto w h s = intercalate "\n" $ take h $ rows ++ repeat blankline
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where
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rows = map (fit w) $ lines s
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fit w = take w . (++ repeat ' ')
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blankline = replicate w ' '
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-- math
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difforzero :: (Num a, Ord a) => a -> a -> a
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difforzero a b = maximum [(a - b), 0]
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-- regexps
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containsRegex :: String -> String -> Bool
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containsRegex r s = case matchRegexPR ("(?i)"++r) s of
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Just _ -> True
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_ -> False
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-- lists
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splitAtElement :: Eq a => a -> [a] -> [[a]]
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splitAtElement e l =
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case dropWhile (e==) l of
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[] -> []
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l' -> first : splitAtElement e rest
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where
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(first,rest) = break (e==) l'
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-- trees
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root = rootLabel
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subs = subForest
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branches = subForest
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-- | List just the leaf nodes of a tree
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leaves :: Tree a -> [a]
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leaves (Node v []) = [v]
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leaves (Node _ branches) = concatMap leaves branches
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-- | get the sub-tree rooted at the first (left-most, depth-first) occurrence
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-- of the specified node value
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subtreeat :: Eq a => a -> Tree a -> Maybe (Tree a)
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subtreeat v t
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| root t == v = Just t
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| otherwise = subtreeinforest v $ subs t
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-- | get the sub-tree for the specified node value in the first tree in
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-- forest in which it occurs.
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subtreeinforest :: Eq a => a -> [Tree a] -> Maybe (Tree a)
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subtreeinforest _ [] = Nothing
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subtreeinforest v (t:ts) = case (subtreeat v t) of
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Just t' -> Just t'
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Nothing -> subtreeinforest v ts
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-- | remove all nodes past a certain depth
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treeprune :: Int -> Tree a -> Tree a
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treeprune 0 t = Node (root t) []
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treeprune d t = Node (root t) (map (treeprune $ d-1) $ branches t)
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-- | apply f to all tree nodes
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treemap :: (a -> b) -> Tree a -> Tree b
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treemap f t = Node (f $ root t) (map (treemap f) $ branches t)
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-- | remove all subtrees whose nodes do not fulfill predicate
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treefilter :: (a -> Bool) -> Tree a -> Tree a
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treefilter f t = Node
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(root t)
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(map (treefilter f) $ filter (treeany f) $ branches t)
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-- | is predicate true in any node of tree ?
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treeany :: (a -> Bool) -> Tree a -> Bool
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treeany f t = f (root t) || any (treeany f) (branches t)
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-- treedrop -- remove the leaves which do fulfill predicate.
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-- treedropall -- do this repeatedly.
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-- | show a compact ascii representation of a tree
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showtree :: Show a => Tree a -> String
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showtree = unlines . filter (containsRegex "[^ |]") . lines . drawTree . treemap show
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-- | show a compact ascii representation of a forest
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showforest :: Show a => Forest a -> String
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showforest = concatMap showtree
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-- debugging
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-- | trace (print on stdout at runtime) a showable expression
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-- (for easily tracing in the middle of a complex expression)
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strace :: Show a => a -> a
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strace a = trace (show a) a
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-- | labelled trace - like strace, with a newline and a label prepended
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ltrace :: Show a => String -> a -> a
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ltrace l a = trace (l ++ ": " ++ show a) a
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-- | trace an expression using a custom show function
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tracewith f e = trace (f e) e
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-- parsing
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parsewith :: Parser a -> String -> Either ParseError a
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parsewith p = parse p ""
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parseWithCtx :: b -> GenParser Char b a -> String -> Either ParseError a
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parseWithCtx ctx p = runParser p ctx ""
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fromparse :: Either ParseError a -> a
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fromparse = either (\e -> error $ "parse error at "++ show e) id
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nonspace :: GenParser Char st Char
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nonspace = satisfy (not . isSpace)
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spacenonewline :: GenParser Char st Char
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spacenonewline = satisfy (`elem` " \v\f\t")
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restofline :: GenParser Char st String
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restofline = anyChar `manyTill` newline
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-- time
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getCurrentLocalTime :: IO LocalTime
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getCurrentLocalTime = do
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t <- getCurrentTime
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tz <- getCurrentTimeZone
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return $ utcToLocalTime tz t
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-- misc
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isLeft :: Either a b -> Bool
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isLeft (Left _) = True
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isLeft _ = False
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isRight :: Either a b -> Bool
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isRight = not . isLeft
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strictReadFile :: FilePath -> IO String
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strictReadFile f = readFile f >>= \s -> Control.Exception.evaluate (length s) >> return s
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