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{-
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Copyright (C) 2012-2017 John MacFarlane <jgm@berkeley.edu>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-}
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{- |
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Module : Text.Pandoc.Slides
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Copyright : Copyright (C) 2012-2017 John MacFarlane
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License : GNU GPL, version 2 or above
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Maintainer : John MacFarlane <jgm@berkeley.edu>
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Stability : alpha
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Portability : portable
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Utility functions for splitting documents into slides for slide
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show formats (dzslides, revealjs, s5, slidy, slideous, beamer).
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-}
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module Text.Pandoc.Slides ( getSlideLevel, prepSlides ) where
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import Text.Pandoc.Definition
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-- | Find level of header that starts slides (defined as the least header
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-- level that occurs before a non-header/non-hrule in the blocks).
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getSlideLevel :: [Block] -> Int
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getSlideLevel = go 6
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where go least (Header n _ _ : x : xs)
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| n < least && nonHOrHR x = go n xs
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| otherwise = go least (x:xs)
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go least (_ : xs) = go least xs
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go least [] = least
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nonHOrHR Header{} = False
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nonHOrHR HorizontalRule = False
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nonHOrHR _ = True
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-- | Prepare a block list to be passed to hierarchicalize.
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prepSlides :: Int -> [Block] -> [Block]
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prepSlides slideLevel = ensureStartWithH . splitHrule . extractRefsHeader
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where splitHrule (HorizontalRule : Header n attr xs : ys)
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| n == slideLevel = Header slideLevel attr xs : splitHrule ys
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splitHrule (HorizontalRule : xs) = Header slideLevel nullAttr [Str "\0"] :
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splitHrule xs
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splitHrule (x : xs) = x : splitHrule xs
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splitHrule [] = []
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extractRefsHeader bs =
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case reverse bs of
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(Div ("",["references"],[]) (Header n attrs xs : ys) : zs)
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-> reverse zs ++ (Header n attrs xs : [Div ("",["references"],[]) ys])
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_ -> bs
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ensureStartWithH bs@(Header n _ _:_)
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| n <= slideLevel = bs
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ensureStartWithH bs = Header slideLevel nullAttr [Str "\0"] : bs
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