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|
-----------------------------------------------------------------------------
-- |
-- Module : Haddock.Backends.Html.Themes
-- Copyright : (c) Mark Lentczner 2010
-- License : BSD-like
--
-- Maintainer : haddock@projects.haskell.org
-- Stability : experimental
-- Portability : portable
-----------------------------------------------------------------------------
module Haddock.Backends.Xhtml.Themes (
Themes,
getThemes,
cssFiles, styleSheet, stylePickers, styleMenu
)
where
import Haddock.Backends.Xhtml.Utils (onclick)
import Haddock.Options
import Control.Monad (liftM)
import Data.Char (toLower)
import Data.Either (lefts, rights)
import Data.List (nub, partition)
import Data.Maybe (isJust, listToMaybe)
import System.Directory
import System.FilePath
import Text.XHtml hiding ( name, title, p, quote, (</>) )
import qualified Text.XHtml as XHtml
--------------------------------------------------------------------------------
-- * CSS Themes
--------------------------------------------------------------------------------
data CssTheme = CssTheme {
themeName :: String,
themeHref :: String,
themeFiles :: [FilePath]
}
type Themes = [CssTheme]
type PossibleTheme = Either String CssTheme
type PossibleThemes = Either String Themes
-- | Standard theme used by default
standardTheme :: FilePath -> IO PossibleThemes
standardTheme libDir = liftM (liftEither (take 1)) (defaultThemes libDir)
-- | Default themes that are part of Haddock; added with --default-themes
defaultThemes :: FilePath -> IO PossibleThemes
defaultThemes libDir = do
themeDirs <- getDirectoryItems (libDir </> "html" </> "themes")
themes <- mapM directoryTheme themeDirs
return $ liftEither shuffle $ sequenceEither themes
where
shuffle ts = let (a,b) = partition isStd ts in a ++ b
isStd c = themeName c == "Ocean"
findTheme :: String -> Themes -> Maybe CssTheme
findTheme s = listToMaybe . filter ((== ls).lower.themeName)
where lower = map toLower
ls = lower s
--------------------------------------------------------------------------------
-- * CSS Theme Arguments
--------------------------------------------------------------------------------
-- | Process input flags for CSS Theme arguments
getThemes :: FilePath -> [Flag] -> IO (Either String Themes)
getThemes libDir flags =
liftM concatEither (mapM themeFlag flags) >>= someTheme
where
themeFlag :: Flag -> IO (Either String Themes)
themeFlag (Flag_CSS path) = (liftM . liftEither) (:[]) (theme path)
themeFlag (Flag_BuiltInThemes) = builtIns
themeFlag _ = retRight []
theme :: FilePath -> IO PossibleTheme
theme path = pick path
[(doesFileExist, singleFileTheme),
(doesDirectoryExist, directoryTheme),
(doesBuiltInExist builtIns, builtInTheme builtIns)]
"Theme not found"
pick :: FilePath
-> [(FilePath -> IO Bool, FilePath -> IO PossibleTheme)] -> String
-> IO PossibleTheme
pick path [] msg = errMessage msg path
pick path ((test,build):opts) msg = do
pass <- test path
if pass then build path else pick path opts msg
someTheme :: Either String Themes -> IO (Either String Themes)
someTheme (Right []) = standardTheme libDir
someTheme est = return est
builtIns = defaultThemes libDir
errMessage :: String -> FilePath -> IO (Either String a)
errMessage msg path = return (Left msg')
where msg' = "Error: " ++ msg ++ ": \"" ++ path ++ "\"\n"
retRight :: a -> IO (Either String a)
retRight = return . Right
singleFileTheme :: FilePath -> IO PossibleTheme
singleFileTheme path =
if isCssFilePath path
then retRight $ CssTheme name file [path]
else errMessage "File extension isn't .css" path
where
name = takeBaseName path
file = takeFileName path
directoryTheme :: FilePath -> IO PossibleTheme
directoryTheme path = do
items <- getDirectoryItems path
case filter isCssFilePath items of
[cf] -> retRight $ CssTheme (takeBaseName path) (takeFileName cf) items
[] -> errMessage "No .css file in theme directory" path
_ -> errMessage "More than one .css file in theme directory" path
doesBuiltInExist :: IO PossibleThemes -> String -> IO Bool
doesBuiltInExist pts s = pts >>= return . either (const False) test
where test = isJust . findTheme s
builtInTheme :: IO PossibleThemes -> String -> IO PossibleTheme
builtInTheme pts s = pts >>= return . either Left fetch
where fetch = maybe (Left ("Unknown theme: " ++ s)) Right . findTheme s
getDirectoryItems :: FilePath -> IO [FilePath]
getDirectoryItems path =
getDirectoryContents path >>= return . map (combine path) . filter notDot
where notDot s = s /= "." && s /= ".."
isCssFilePath :: FilePath -> Bool
isCssFilePath path = takeExtension path == ".css"
--------------------------------------------------------------------------------
-- * Style Sheet Utilities
--------------------------------------------------------------------------------
cssFiles :: Themes -> [String]
cssFiles ts = nub $ concatMap themeFiles ts
styleSheet :: Themes -> Html
styleSheet ts = toHtml $ zipWith mkLink rels ts
where
rels = ("stylesheet" : repeat "alternate stylesheet")
mkLink aRel t =
thelink
! [ href (themeHref t), rel aRel, thetype "text/css",
XHtml.title (themeName t)
]
<< noHtml
stylePickers :: Themes -> [Html]
stylePickers ts = map mkPicker ts
where
mkPicker t =
let js = "setActiveStyleSheet('" ++ themeHref t ++ "'); return false;" in
anchor ! [href "#", onclick js] << themeName t
styleMenu :: Themes -> Html
styleMenu [] = noHtml
styleMenu [_] = noHtml
styleMenu ts = thediv ! [identifier "style-menu-holder"] << [
anchor ! [ href "#", onclick js ] << "Style \9662",
unordList (stylePickers ts) ! [ identifier "style-menu", theclass "hide" ]
]
where
js = "styleMenu(); return false;"
--------------------------------------------------------------------------------
-- * Either Utilities
--------------------------------------------------------------------------------
-- These three routines are here because Haddock does not have access to the
-- Control.Monad.Error module which supplies the Functor and Monad instances
-- for Either String.
sequenceEither :: [Either a b] -> Either a [b]
sequenceEither es = maybe (Right $ rights es) Left (listToMaybe (lefts es))
liftEither :: (b -> c) -> Either a b -> Either a c
liftEither f = either Left (Right . f)
concatEither :: [Either a [b]] -> Either a [b]
concatEither = liftEither concat . sequenceEither
|
