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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
)
where
import Haddock.Options
import Control.Monad (liftM)
import Data.Char (toLower)
import Data.Either (lefts, rights)
import Data.List (nub)
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 Theme = Theme {
themeName :: String,
themeHref :: String,
themeFiles :: [FilePath]
}
type Themes = [Theme]
type PossibleTheme = Either String Theme
type PossibleThemes = Either String Themes
-- | Find a theme by name (case insensitive match)
findTheme :: String -> Themes -> Maybe Theme
findTheme s = listToMaybe . filter ((== ls).lower.themeName)
where lower = map toLower
ls = lower s
-- | 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
-- The first theme in this list is considered the standard theme.
-- Themes are "discovered" by scanning the html sub-dir of the libDir,
-- and looking for directories with the extension .theme or .std-theme.
-- The later is, obviously, the standard theme.
defaultThemes :: FilePath -> IO PossibleThemes
defaultThemes libDir = do
themeDirs <- getDirectoryItems (libDir </> "html")
themes <- mapM directoryTheme $ discoverThemes themeDirs
return $ sequenceEither themes
where
discoverThemes paths =
filterExt ".std-theme" paths ++ filterExt ".theme" paths
filterExt ext = filter ((== ext).takeExtension)
-- | Build a theme from a single .css file
singleFileTheme :: FilePath -> IO PossibleTheme
singleFileTheme path =
if isCssFilePath path
then retRight $ Theme name file [path]
else errMessage "File extension isn't .css" path
where
name = takeBaseName path
file = takeFileName path
-- | Build a theme from a directory
directoryTheme :: FilePath -> IO PossibleTheme
directoryTheme path = do
items <- getDirectoryItems path
case filter isCssFilePath items of
[cf] -> retRight $ Theme (takeBaseName path) (takeFileName cf) items
[] -> errMessage "No .css file in theme directory" path
_ -> errMessage "More than one .css file in theme directory" path
-- | Check if we have a built in theme
doesBuiltInExist :: IO PossibleThemes -> String -> IO Bool
doesBuiltInExist pts s = fmap (either (const False) test) pts
where test = isJust . findTheme s
-- | Find a built in theme
builtInTheme :: IO PossibleThemes -> String -> IO PossibleTheme
builtInTheme pts s = either Left fetch <$> pts
where fetch = maybe (Left ("Unknown theme: " ++ s)) Right . findTheme s
--------------------------------------------------------------------------------
-- * CSS Theme Arguments
--------------------------------------------------------------------------------
-- | Process input flags for CSS Theme arguments
getThemes :: FilePath -> [Flag] -> IO PossibleThemes
getThemes libDir flags =
liftM concatEither (mapM themeFlag flags) >>= someTheme
where
themeFlag :: Flag -> IO (Either String Themes)
themeFlag (Flag_CSS path) = (liftM . liftEither) (:[]) (theme path)
themeFlag (Flag_BuiltInThemes) = builtIns
themeFlag _ = retRight []
theme :: FilePath -> IO PossibleTheme
theme path = pick path
[(doesFileExist, singleFileTheme),
(doesDirectoryExist, directoryTheme),
(doesBuiltInExist builtIns, builtInTheme builtIns)]
"Theme not found"
pick :: FilePath
-> [(FilePath -> IO Bool, FilePath -> IO PossibleTheme)] -> String
-> IO PossibleTheme
pick path [] msg = errMessage msg path
pick path ((test,build):opts) msg = do
pass <- test path
if pass then build path else pick path opts msg
someTheme :: Either String Themes -> IO (Either String Themes)
someTheme (Right []) = standardTheme libDir
someTheme est = return est
builtIns = defaultThemes libDir
errMessage :: String -> FilePath -> IO (Either String a)
errMessage msg path = return (Left msg')
where msg' = "Error: " ++ msg ++ ": \"" ++ path ++ "\"\n"
retRight :: a -> IO (Either String a)
retRight = return . Right
--------------------------------------------------------------------------------
-- * File Utilities
--------------------------------------------------------------------------------
getDirectoryItems :: FilePath -> IO [FilePath]
getDirectoryItems path =
map (combine path) . filter notDot <$> getDirectoryContents path
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
--------------------------------------------------------------------------------
-- * 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
|
