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<title>src/Text/Pandoc/Slides.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-
<a name="line-2"></a>Copyright (C) 2012 John MacFarlane <jgm@berkeley.edu>
<a name="line-3"></a>
<a name="line-4"></a>This program is free software; you can redistribute it and/or modify
<a name="line-5"></a>it under the terms of the GNU General Public License as published by
<a name="line-6"></a>the Free Software Foundation; either version 2 of the License, or
<a name="line-7"></a>(at your option) any later version.
<a name="line-8"></a>
<a name="line-9"></a>This program is distributed in the hope that it will be useful,
<a name="line-10"></a>but WITHOUT ANY WARRANTY; without even the implied warranty of
<a name="line-11"></a>MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
<a name="line-12"></a>GNU General Public License for more details.
<a name="line-13"></a>
<a name="line-14"></a>You should have received a copy of the GNU General Public License
<a name="line-15"></a>along with this program; if not, write to the Free Software
<a name="line-16"></a>Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
<a name="line-17"></a>-}</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-comment'>{- |
<a name="line-20"></a> Module : Text.Pandoc.Slides
<a name="line-21"></a> Copyright : Copyright (C) 2012 John MacFarlane
<a name="line-22"></a> License : GNU GPL, version 2 or above
<a name="line-23"></a>
<a name="line-24"></a> Maintainer : John MacFarlane <jgm@berkeley.edu>
<a name="line-25"></a> Stability : alpha
<a name="line-26"></a> Portability : portable
<a name="line-27"></a>
<a name="line-28"></a>Utility functions for splitting documents into slides for slide
<a name="line-29"></a>show formats (dzslides, s5, slidy, slideous, beamer).
<a name="line-30"></a>-}</span>
<a name="line-31"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Pandoc</span><span class='hs-varop'>.</span><span class='hs-conid'>Slides</span> <span class='hs-layout'>(</span> <span class='hs-varid'>getSlideLevel</span><span class='hs-layout'>,</span> <span class='hs-varid'>prepSlides</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Pandoc</span><span class='hs-varop'>.</span><span class='hs-conid'>Definition</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="getSlideLevel"></a><span class='hs-comment'>-- | Find level of header that starts slides (defined as the least header</span>
<a name="line-35"></a><span class='hs-comment'>-- level that occurs before a non-header/non-hrule in the blocks).</span>
<a name="line-36"></a><span class='hs-definition'>getSlideLevel</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Block</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-37"></a><span class='hs-definition'>getSlideLevel</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-num'>6</span>
<a name="line-38"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>go</span> <span class='hs-varid'>least</span> <span class='hs-layout'>(</span><span class='hs-conid'>Header</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span> <span class='hs-conop'>:</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-varid'>least</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>nonHOrHR</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-varid'>n</span> <span class='hs-varid'>xs</span>
<a name="line-40"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-varid'>least</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-41"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>least</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span> <span class='hs-conop'>:</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-varid'>least</span> <span class='hs-varid'>xs</span>
<a name="line-42"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>least</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>least</span>
<a name="line-43"></a> <span class='hs-varid'>nonHOrHR</span> <span class='hs-layout'>(</span><span class='hs-conid'>Header</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-44"></a> <span class='hs-varid'>nonHOrHR</span> <span class='hs-layout'>(</span><span class='hs-conid'>HorizontalRule</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-45"></a> <span class='hs-varid'>nonHOrHR</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="prepSlides"></a><span class='hs-comment'>-- | Prepare a block list to be passed to hierarchicalize.</span>
<a name="line-48"></a><span class='hs-definition'>prepSlides</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Block</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Block</span><span class='hs-keyglyph'>]</span>
<a name="line-49"></a><span class='hs-definition'>prepSlides</span> <span class='hs-varid'>slideLevel</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ensureStartWithH</span> <span class='hs-varop'>.</span> <span class='hs-varid'>splitHrule</span>
<a name="line-50"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>splitHrule</span> <span class='hs-layout'>(</span><span class='hs-conid'>HorizontalRule</span> <span class='hs-conop'>:</span> <span class='hs-conid'>Header</span> <span class='hs-varid'>n</span> <span class='hs-varid'>xs</span> <span class='hs-conop'>:</span> <span class='hs-varid'>ys</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-varid'>slideLevel</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Header</span> <span class='hs-varid'>slideLevel</span> <span class='hs-varid'>xs</span> <span class='hs-conop'>:</span> <span class='hs-varid'>splitHrule</span> <span class='hs-varid'>ys</span>
<a name="line-52"></a> <span class='hs-varid'>splitHrule</span> <span class='hs-layout'>(</span><span class='hs-conid'>HorizontalRule</span> <span class='hs-conop'>:</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Header</span> <span class='hs-varid'>slideLevel</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Str</span> <span class='hs-str'>"\0"</span><span class='hs-keyglyph'>]</span> <span class='hs-conop'>:</span>
<a name="line-53"></a> <span class='hs-varid'>splitHrule</span> <span class='hs-varid'>xs</span>
<a name="line-54"></a> <span class='hs-varid'>splitHrule</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>splitHrule</span> <span class='hs-varid'>xs</span>
<a name="line-55"></a> <span class='hs-varid'>splitHrule</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-56"></a> <span class='hs-varid'>ensureStartWithH</span> <span class='hs-varid'>bs</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Header</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span>
<a name="line-57"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-varid'>slideLevel</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bs</span>
<a name="line-58"></a> <span class='hs-varid'>ensureStartWithH</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Header</span> <span class='hs-varid'>slideLevel</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Str</span> <span class='hs-str'>"\0"</span><span class='hs-keyglyph'>]</span> <span class='hs-conop'>:</span> <span class='hs-varid'>bs</span>
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