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{-
oso2pdf --- Better conversion of Oxford Scholarship Online material to PDF
Copyright (C) 2015 Sean Whitton
This file is part of oso2pdf.
oso2pdf 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 3 of the License, or
(at your option) any later version.
oso2pdf 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 oso2pdf. If not, see <http://www.gnu.org/licenses/>.
-}
import Data.List (isPrefixOf, isSuffixOf)
import Data.Monoid ((<>))
import Text.Pandoc.JSON
data Page = Page Int [Block]
instance Monoid Page where
mempty = Page 1 []
(Page n xs) `mappend` (Page _ ys) = Page n (xs ++ ys)
pagesToBlocks :: [Page] -> [Block]
pagesToBlocks [Page _ xs] = xs
pagesToBlocks ps@( _ : (Page n _) : _) =
RawBlock (Format "tex") ("\\setcounter{page}{" ++ show (n - 1) ++ "}")
: (drop 1 $ foldr step [] ps) -- drop first \\pagebreak
where
step (Page n p) ps = RawBlock (Format "tex") "\\pagebreak" : p ++ ps
-- TODO factor out joining Pages together and appending or just
-- putting side by side
blocksToPages :: [Block] -> [Page]
blocksToPages = foldr step []
where
step (Para xs) [] = paraToPages xs
step x [] = [Page 1 [x]]
step (Para xs) ( y@(Page n _) : ys ) =
case paraToPages xs of
[a, b] -> if n /= 1 then a : b : y : ys else a : (b <> y) : ys
[a] -> if n /= 1 then a : y : ys else (a <> y) : ys
step x (y:ys) = ((Page 1 [x]) <> y) : ys
-- ASSUME: not more than one page break per paragraph!
paraToPages :: [Inline] -> [Page]
paraToPages para = let (first, n, second) = foldr step ([], 1, []) para
in if n == 1
then [Page 1 [Para second]]
else if null first
then [Page 1 [Para first], Page n [Para second]]
else [ Page 1 [Para first]
, Page n [Para (RawInline (Format "tex") "\\noindent"
: second)]]
where
step chunk (xs, n, ys) =
if n /= 1
then (chunk : xs, n, ys)
else case chunk of
(Str x) -> if "(p." `isPrefixOf` x && ")" `isSuffixOf` x
then let m = read . drop 3 . init $ x
in (xs, m, ys) -- TODO: what about [Space, Space] left behind?
else (xs, n, chunk : ys)
_ -> (xs, n, chunk : ys)
main = toJSONFilter process
where
process (Pandoc meta blocks) = Pandoc meta (pagesToBlocks . blocksToPages $ blocks)
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