src/Text/Pandoc/Slides.hs · typeable/pandoc

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typeable/pandoc/src/Text/Pandoc/Slides.hs

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1{-

4This program is free software; you can redistribute it and/or modify

5it under the terms of the GNU General Public License as published by

6the Free Software Foundation; either version 2 of the License, or

7(at your option) any later version.

9This program is distributed in the hope that it will be useful,

10but WITHOUT ANY WARRANTY; without even the implied warranty of

11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

12GNU General Public License for more details.

14You should have received a copy of the GNU General Public License

15along with this program; if not, write to the Free Software

16Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

17-}

19{- |

20 Module : Text.Pandoc.Slides

22 License : GNU GPL, version 2 or above

24 Maintainer : John MacFarlane <jgm@berkeley.edu>

25 Stability : alpha

26 Portability : portable

28Utility functions for splitting documents into slides for slide

29show formats (dzslides, revealjs, s5, slidy, slideous, beamer).

30-}

31module Text.Pandoc.Slides ( getSlideLevel, prepSlides ) where

32import Text.Pandoc.Definition

34-- | Find level of header that starts slides (defined as the least header

35-- level that occurs before a non-header/non-hrule in the blocks).

36getSlideLevel :: [Block] -> Int

37getSlideLevel = go 6

38 where go least (Header n _ _ : x : xs)

39 | n < least && nonHOrHR x = go n xs

40 | otherwise = go least (x:xs)

41 go least (_ : xs) = go least xs

42 go least [] = least

43 nonHOrHR (Header{}) = False

44 nonHOrHR (HorizontalRule) = False

45 nonHOrHR _ = True

47-- | Prepare a block list to be passed to hierarchicalize.

48prepSlides :: Int -> [Block] -> [Block]

49prepSlides slideLevel = ensureStartWithH . splitHrule . extractRefsHeader

50 where splitHrule (HorizontalRule : Header n attr xs : ys)

51 | n == slideLevel = Header slideLevel attr xs : splitHrule ys

52 splitHrule (HorizontalRule : xs) = Header slideLevel nullAttr [Str "\0"] :

53 splitHrule xs

54 splitHrule (x : xs) = x : splitHrule xs

55 splitHrule [] = []

56 extractRefsHeader bs =

57 case reverse bs of

58 (Div ("",["references"],[]) (Header n attrs xs : ys) : zs)

59 -> reverse zs ++ (Header n attrs xs : [Div ("",["references"],[]) ys])

60 _ -> bs

61 ensureStartWithH bs@(Header n _ _:_)

62 | n <= slideLevel = bs

63 ensureStartWithH bs = Header slideLevel nullAttr [Str "\0"] : bs