33 lines
1.3 KiB
Lua
33 lines
1.3 KiB
Lua
 
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-- Copyright (c) 2026 Marc Wäckerlin. SPDX-License-Identifier: MIT
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-- Every drawing a document shows, converted while pandoc reads the document.
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--
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-- graphicx cannot read an SVG, and pandoc's own answer to one is the svg
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-- package, which calls inkscape from inside the LaTeX run and therefore needs
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-- shell escape — a document could then run any command it likes. So the drawing
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-- is converted here, before a single line of LaTeX exists, and the picture in
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-- the document points at the PDF that comes out.
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--
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-- The two directories arrive in the environment, from the converter: where the
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-- document lies, and where the build may write.
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local build = os.getenv('MD2PDF_BUILD')
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local source = os.getenv('MD2PDF_SOURCE_DIR')
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local function absolute(file)
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return file:sub(1, 1) == '/' and file or source .. '/' .. file
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end
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function Image(image)
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if not image.src:lower():match('%.svg$') then return nil end
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local name = image.src:gsub('.*/', ''):gsub('%.[Ss][Vv][Gg]$', '') .. '.pdf'
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local target = build .. '/' .. name
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local converted, message = pcall(pandoc.pipe, 'inkscape',
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{'--export-type=pdf', '--export-filename=' .. target,
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absolute(image.src)}, '')
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if not converted then
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error('the drawing ' .. image.src .. ' could not be converted: '
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.. tostring(message))
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end
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image.src = target
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return image
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end
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