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{-# LANGUAGE ScopedTypeVariables, CPP #-}
{-
Copyright (C) 2009 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
module Yst.Build (buildSite)
where
import Yst.Types
import Yst.Util
import Yst.Render
import qualified Data.Map as M
import Data.Maybe (fromMaybe, mapMaybe)
import Data.List
import System.FilePath
import System.Directory
import System.Exit
#if MIN_VERSION_directory(1,2,0)
import Data.Time.Calendar (Day(..))
import Data.Time.Clock (UTCTime(..), secondsToDiffTime)
#else
import System.Time (ClockTime(..))
#endif
-- Note: ghc >= 6.12 (base >=4.2) supports unicode through iconv
-- So we use System.IO.UTF8 only if we have an earlier version
#if MIN_VERSION_base(4,2,0)
import System.IO (hPutStrLn)
import Prelude hiding (catch)
#else
import Prelude hiding (readFile, putStrLn, print, writeFile, catch)
import System.IO.UTF8
#endif
import System.IO (stderr)
import Control.Monad
import Control.Exception (catch, SomeException)
#if MIN_VERSION_directory(1,2,0)
minTime :: UTCTime
minTime = UTCTime (ModifiedJulianDay 0) (secondsToDiffTime 0)
#else
minTime :: ClockTime
minTime = TOD 0 0
#endif
findSource :: Site -> FilePath -> IO FilePath
findSource = searchPath . sourceDir
dependencies :: Site -> String -> IO [FilePath]
dependencies site url = do
let page = case M.lookup url (pageIndex site) of
Nothing -> error $ "Tried to get dependencies for nonexistent page: " ++ url
Just pg -> pg
layout <- findSource site $ stripStExt (fromMaybe (defaultLayout site) $ layoutFile page) <.> "st"
requires <- mapM (findSource site) $ requiresFiles page
srcdir <- findSource site $
case sourceFile page of
TemplateFile f -> stripStExt f <.> "st"
SourceFile f -> f
let fileFromSpec (DataFromFile f _) = Just f
fileFromSpec (DataFromSqlite3 f _ _) = Just f
fileFromSpec _ = Nothing
dataFiles <- mapM (searchPath $ dataDir site) $ mapMaybe (\(_,s) -> fileFromSpec s) $ pageData page
return $ indexFile site : layout : srcdir : (requires ++ dataFiles)
buildSite :: Site -> IO ()
buildSite site = do
let filesIn dir = liftM (filter (/=".") . map (makeRelative dir)) $ getDirectoryContentsRecursive dir
files <- liftM concat $ mapM filesIn $ filesDir site
let pages = M.keys $ pageIndex site
let overlap = files `intersect` pages
unless (null overlap) $ forM_ overlap
(\f -> hPutStrLn stderr $ "Warning: the page '" ++ f ++ "' will overwrite the file by the same name.")
forM_ files $ \file ->
updateFile site file
forM_ pages $ \page ->
case M.lookup page (pageIndex site) of
Just pg -> updatePage site pg
Nothing -> error $ "Couldn't find page " ++ page
updateFile :: Site -> FilePath -> IO ()
updateFile site file = do
let destpath = deployDir site </> file
srcpath <- searchPath (filesDir site) file
srcmod <- getModificationTime srcpath
destmod <- catch (getModificationTime destpath)
(\(_::SomeException) -> return minTime)
if srcmod > destmod
then do
createDirectoryIfMissing True $ takeDirectory destpath
hPutStrLn stderr $ "Updating " ++ destpath
copyFile srcpath destpath
else return ()
updatePage :: Site -> Page -> IO ()
updatePage site page = do
let destpath = deployDir site </> pageUrl page
deps <- dependencies site $ pageUrl page
forM_ deps $ \dep -> do
exists <- doesFileExist dep
unless exists $ do
hPutStrLn stderr $ "Missing dependency: " ++ dep
hPutStrLn stderr $ "Aborting! Cannot build " ++ destpath
exitWith $ ExitFailure 3
depsmod <- mapM getModificationTime deps
destmod <- catch (getModificationTime destpath)
(\(_::SomeException) -> return minTime)
if maximum depsmod > destmod
then do
createDirectoryIfMissing True $ takeDirectory destpath
hPutStrLn stderr $ "Updating " ++ destpath
renderPage site page >>= writeFile destpath
else return ()