32e358b · typeable/pandoc

550

551This filter converts raw LaTeX tikz environments into images. It

552works with both PDF and HTML output. The tikz code is compiled

553−to an image using `pdflatex`, and the image is converted (if

553+to an image using `pdflatex`, and the image is converted from pdf

554−necessary) from pdf to png format using ImageMagick's `convert`,

554+to svg format using [`pdf2svg`](https://github.com/dawbarton/pdf2svg),

555so both of these must be in the system path. Converted images

556are cached in the working directory and given filenames based on

557a hash of the source, so that they need not be regenerated each

563 local tmp = os.tmpname()

564 local tmpdir = string.match(tmp, "^(.*[\\/])") or "."

565 local f = io.open(tmp .. ".tex", 'w')

566− f:write("\\documentclass{standalone}\n\\usepackage{tikz}\n\\begin{document}\n")

566+ f:write("\\documentclass{standalone}\n\\usepackage{xcolor}\n\\usepackage{tikz}\n\\begin{document}\n\\nopagecolor\n")

567 f:write(src)

568 f:write("\n\\end{document}\n")

569 f:close()

571 if filetype == 'pdf' then

572 os.rename(tmp .. ".pdf", outfile)

573 else

574− os.execute("convert " .. tmp .. ".pdf " .. outfile)

574+ os.execute("pdf2svg " .. tmp .. ".pdf " .. outfile)

575 end

576 os.remove(tmp .. ".tex")

577 os.remove(tmp .. ".pdf")

580end

581

582extension_for = {

583− html = 'png',

583+ html = 'svg',

584− html4 = 'png',

584+ html4 = 'svg',

585− html5 = 'png',

585+ html5 = 'svg',

586 latex = 'pdf',

587 beamer = 'pdf' }

588

596 end

597end

598

599+local function starts_with(start, str)

600+ return str:sub(1, #start) == start

601+end

602+

603+

599function RawBlock(el)

604function RawBlock(el)

605+ if starts_with("\\begin{tikzpicture}", el.text) then

600− local filetype = extension_for[FORMAT] or "png"

606+ local filetype = extension_for[FORMAT] or "svg"

601− local fname = pandoc.sha1(el.text) .. "." .. filetype

607+ local fname = pandoc.sha1(el.text) .. "." .. filetype

602− if not file_exists(fname) then

608+ if not file_exists(fname) then

603− tikz2image(el.text, filetype, fname)

609+ tikz2image(el.text, filetype, fname)

610+ end

611+ return pandoc.Para({pandoc.Image({}, fname)})

612+ else

613+ return el

604 end

614 end

605− return pandoc.Para({pandoc.Image({}, fname)})

606end

615end

607```

616```

608

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