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This also necessitated implementing colors and underlining, though
there is currently no way to produce these from markdown. Note that
background colors can't be implemented in PowerPoint, so highlighting
styles that require these will be incomplete.
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This allows us to set document metadata properties from pandoc metadata.
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This picks up the necessary information from meta and carries it over
to the XML output, so Output.hs doesn't need access to the original
pandoc information.
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This is an internal change to the Presentation type. The algebraic
datatype that used to be called `Slide` is now `Layout`, and Slide is
defined as `Slide SlideId Layout (Maybe Notes)`. Though there should
be no user-visible changes in this commit, it offers two benefits
moving forward:
1. Slides now carry their Id with them, instead of being assigned it
in deck order. This makes it easier to set up a link to, say, an
endnotes slide ahead of time.
2. This makes room for Notes slides, when we implement them.
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Rather than passing around attributes, we can have image sizing in the
picProps and then pass it along to write to XML.
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The toplevel .rels file could have a thumbnail image if taken from the
template. Rather than removing it from the inherited file, it's easier
to just make our own.
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There was a glob error that was leading to images from the
reference-doc pptx not being imported. We don't need a glob here --
just replace it with `isPrefixOf`.
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They were broken when I refactored (the Output module wanted to use
state left over from the construction of the Presentation type). This
change introduces a new type `LinkTarget = InternalTarget |
ExternalTarget`. Internal target points to a slide number, and these
will all be resolved before the Presentation is passed along to the
Output module.
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There are two steps in the conversion: a conversion from pandoc to a
Presentation datatype modeling pptx, and a conversion from
Presentation to a pptx archive. The two steps were sharing the same
state and environment, and the code was getting a bit
spaghetti-ish. This separates the conversion into separate
modules (T.P.W.Powerpoint.Presentation, which defineds the
Presentation datatype and goes Pandoc->Presentation)
and (T.P.W.Pandoc.Output, which goes Presentation->Archive).
Text.Pandoc.Writers.Powerpoint a thin wrapper around the two modules.
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