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module Main where
import System.Directory
import System.FilePath
import System.Environment (getArgs)
import System.IO
import Data.Maybe (fromMaybe, isJust, fromJust)
import Data.List (isPrefixOf, isSuffixOf, scanl, scanr, zipWith3, intersperse, sort, inits, tails)
import Control.Monad (when, unless)
import Data.Foldable (foldrM)
import System.Exit (die)
import qualified Data.Text as T
import qualified Data.Text.IO as T
isFragment :: FilePath -> Bool
isFragment f =
(isSuffixOf ".html" f || isSuffixOf ".frag" f)
valid :: FilePath -> FilePath -> Bool
valid r f =
and $ (isAbsolute r):(isAbsolute f):zipWith (==) r f
prettyName :: FilePath -> String
{- XXX more -}
prettyName f = takeBaseName $ dropExtension f
header :: T.Text -> T.Text -> T.Text
header title nav = T.unlines
[ T.pack "<!DOCTYPE html>"
, T.pack "<html>"
, T.pack " <head>"
, T.pack " <meta charset='UTF-8' />"
, T.concat [T.pack " <title>" , title , T.pack "</title>" ]
, T.pack " <link rel=\"stylesheet\" href=\"/css/style.css\" />"
, T.pack " <link rel=\"icon\" href=\"/favicon.ico\" type=\"image/x-icon\"/>"
, T.pack " </head>"
, T.pack " <body>"
, T.pack " <div class=\"stuck\">"
, T.pack " <header>"
, T.pack " <p>"
, T.pack " Professional Webring >>"
, T.pack " <a href=\"https://roscoeeh.github.io\">Prev - Roscoe</a>"
, T.pack " |"
, T.pack " <a href=\"https://elle-wen.github.io\">Next - Elle</a>"
, T.pack " </p>"
, T.pack " </header>"
, T.concat [ T.pack "<nav>" , nav , T.pack "</nav>" ]
, T.pack " </div>"
, T.pack " <main>"
]
footer :: T.Text
footer = T.pack $ unlines
[ "</main>"
, "<footer>"
, "</footer>"
, "</body>"
, "</html>"
]
parse :: FilePath -> IO (T.Text, T.Text)
{- XXX use T.hGetLine to try to delay the memory cost.
Maybe doesn't matter if I'm going to have it all in memory later
anyway?
-}
parse f = withFile f ReadMode $ \h -> do
c <- T.hGetContents h
case T.lines c of
[] -> pure (fallback, c)
l:_ -> case T.stripPrefix (T.pack "<!-- == ") l
>>= T.stripSuffix (T.pack " -->") of
Nothing -> pure (fallback, c)
Just comment ->
let pairs = T.splitOn (T.pack "|") comment
kvs = map (dropEq . T.span (/= '=')) pairs
name = fromMaybe fallback $ lookup (T.pack "title") kvs
in pure (name, c)
where fallback = T.pack $ prettyName f
dropEq (key, ev) = case T.uncons ev of
Just ('=', rest) -> (key,rest)
_ -> (key, ev)
data Nav
= NavDir { navChildren :: [Nav]
, navIndexFrag :: Nav {- will be NavFile, contains title -}
, navDirPath :: FilePath
}
| NavFile { navFrag :: T.Text
, navTitle :: T.Text
, navFilePath :: FilePath
}
instance Show Nav where
show (NavDir cs _ p) =
concat $ intersperse "\n"
[ "NavDir " ++ p ++ ":"
, concat $ intersperse "\n" $ map (indent . show) cs
]
where indent s = concat $ intersperse "\n" $ map ("\t"++) $ lines s
show (NavFile _ t p) =
"NavFile " ++ T.unpack t ++ " " ++ p
convert :: FilePath -> FilePath -> IO Nav
convert r f = do
unless (valid r f) $
die $ "Don't know what to do with: " ++ f
de <- doesDirectoryExist f
fe <- (isFragment f &&) <$> doesFileExist f
case de of
True -> do
allChildren <- (map (f </>)) <$> listDirectory f
let downlinks = sort $ allChildren
let filterInterested c acc = do
isDir <- doesDirectoryExist c
case isDir || ((isFragment c) && (not $ isSuffixOf "index.html" c)) of
True -> pure $ c:acc
False -> pure acc
filtered <- foldrM filterInterested [] downlinks
navChildren <- mapM (convert r) filtered
navIndexFrag <- do
let ifp = f </> "index.html"
fe <- doesFileExist ifp
case fe of
True -> do
(name, contents) <- parse ifp
pure $ NavFile contents name (makeRelative r ifp)
False -> pure $ fallbackIndexNav (makeRelative r ifp) navChildren
let navDirPath = makeRelative r f
pure $ NavDir { navChildren = navChildren
, navIndexFrag = navIndexFrag
, navDirPath = navDirPath
}
False -> case fe of
True -> do
(navTitle, navFrag) <- parse f
let navFilePath = makeRelative r f
pure $ NavFile { navFrag = navFrag
, navTitle = navTitle
, navFilePath = navFilePath
}
False ->
die $ "Path doesn't exist or is not a directory or file: " ++ f
fallbackIndexNav :: FilePath -> [Nav] -> Nav
fallbackIndexNav p ns = NavFile (fallbackIndexFrag p ns) (T.pack . takeFileName $ takeDirectory p) p
fallbackIndexFrag :: FilePath -> [Nav] -> T.Text
fallbackIndexFrag _ _ = (T.pack "<p>Fallback index.</p>")
generate :: T.Text -> Nav -> T.Text
{- Generate the full text of a page. -}
generate nav (NavFile f t _) =
T.concat [ header t nav , f , footer ]
generate nav (NavDir _ (NavFile f t _) _) =
T.concat [ header t nav , f , footer ]
generate _ _ = error "malformed NavDir"
mkNavItem :: Nav -> T.Text
{- Generate a listing for a file or a listing for a dir and optionally
one level of children -}
mkNavItem (NavFile _ t p) =
T.concat [ T.pack "<li><a class='active' href=\""
, T.pack $ (pathSeparator:p -<.> "html")
, T.pack "\">"
, t
, T.pack "</a></li>"
]
mkNavItem (NavDir _ idxf _) = mkNavItem idxf
emit :: FilePath -> T.Text -> Nav -> T.Text -> IO ()
emit outdir nav1 f@(NavFile _ _ p) nav2 = do
let contents = generate (T.append nav1 nav2) f
T.writeFile (outdir </> p -<.> "html") contents
emit outdir nav1 (NavDir cs i dp) nav2 = do
let newdir = outdir </> dp
exists <- doesDirectoryExist newdir
unless exists $ createDirectory newdir
let sharedBefore = T.append nav1 $ T.pack "<ul>"
let sharedAfter = T.append (T.pack "</ul>") nav2
let ncs = map mkNavItem cs
let priors = inits ncs
let posts = tails ncs
let nbefore = map (\x -> T.append sharedBefore (T.concat x)) priors
let nafter = map (\x -> T.append (T.concat x) sharedAfter ) posts
let actions = zipWith3 (emit outdir) (tail nbefore) cs (tail nafter)
_ <- sequence actions
emit outdir (head nbefore) i (head nafter)
main :: IO ()
main = do
flags@(Flags r o s) <- canonicalizeFlags <$> handleArgs
unless (valid r r) $
die $ "R isn't valid. Maybe not absolute? " ++ r
unless (isAbsolute o) $
die $ "O not absolute " ++ o
hPutStr stderr $ "Using config: " ++ show flags
tree <- convert r r
hPutStr stderr $ "\nFound tree:\n" ++ show tree
let rNav = T.append (T.pack "<ul>") (mkNavItem tree)
emit o rNav tree (T.pack "</ul>")
when (isJust s) $
case isAbsolute $ fromJust s of
True -> copyInto (fromJust s) o
False -> die $ "S input not absolute " ++ (fromJust s)
where canonicalizeFlags (Flags r o s) =
Flags (normalise r) (normalise o) (normalise <$> s)
data Flags = Flags
{ root :: FilePath
, output :: FilePath
, static :: Maybe FilePath
}
deriving (Show)
handleArgs :: IO Flags
handleArgs = do
args <- getArgs
when (null args) $ die usage
let missing = Flags
{ root = error "-r root is required"
, output = error "-o output is required"
, static = Nothing
}
helper missing args
where helper f [] = pure f
helper f ("-r":a:rest) = helper (f { root = a }) rest
helper f ("-o":a:rest) = helper (f { output = a }) rest
helper f ("-s":a:rest) = helper (f { static = Just a }) rest
helper _ ("-h":_) = die usage
helper _ (x:_) = die $ "Unknown or orphan flag: " ++ x ++ "\n" ++ usage
usage :: String
usage = unlines
[ "Usage:"
, "\tloom -r {root path} -o {output path} [-s {static path}]"
, "\t-r supplies a root to pull fragments from"
, "\t-o supplies the output directory to place html in"
, "\t-s (optional) supplies a directory to be copied into the output after generation"
, "all paths must be absolute."
, "any fragment may be given a name by having the first line be in the following format:"
, "\t<!-- == title={title} -->"
, "note that the spaces are important. The title may not contain newlines or the vertical bar character."
]
copyInto :: FilePath -> FilePath -> IO ()
copyInto src dst = do
se <- doesDirectoryExist src
unless se $
die $ "source does not exist: " ++ src
de <- doesDirectoryExist dst
unless de $ createDirectory dst
when (isPrefixOf src dst) $
die $ "Overlapping directories: " ++ src ++ " to " ++ dst
content <- listDirectory src
flip mapM_ content $ \name -> do
let srcPath = src </> name
let dstPath = dst </> name
isDirectory <- doesDirectoryExist srcPath
if isDirectory
then copyInto srcPath dstPath
else copyFile srcPath dstPath
|
