website/scripts/tikz.lua

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Lua
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2022-12-27 22:04:45 +01:00
local system = require 'pandoc.system'
local tikz_doc_template = [[
\documentclass{standalone}
\usepackage[pdftex]{graphics}
\usepackage[pdftex]{graphicx}
\usepackage{xcolor}
\usepackage{tikz}
\begin{document}
\nopagecolor
%s
\end{document}
]]
local function tikz2image(src, filetype, outfile)
system.with_temporary_directory('tikz2image', function (tmpdir)
system.with_working_directory(tmpdir, function()
local f = io.open('tikz.tex', 'w')
f:write(tikz_doc_template:format(src))
f:close()
os.execute('pdflatex tikz.tex >/dev/null 2>&1')
if filetype == 'pdf' then
os.rename('tikz.pdf', outfile)
else
os.execute('pdf2svg tikz.pdf ' .. outfile .. '>/dev/null 2>&1')
end
end)
end)
end
extension_for = {
html = 'svg',
html4 = 'svg',
html5 = 'svg',
latex = 'pdf',
beamer = 'pdf' }
local function file_exists(name)
local f = io.open(name, 'r')
if f ~= nil then
io.close(f)
return true
else
return false
end
end
local function starts_with(start, str)
return str:sub(1, #start) == start
end
function RawBlock(el)
if starts_with('\\begin{tikzpicture}', el.text) then
local filetype = extension_for[FORMAT] or 'svg'
local fbasename = pandoc.sha1(el.text) .. '.' .. filetype
local fname = system.get_working_directory() .. '/' .. fbasename
if not file_exists(fname) then
tikz2image(el.text, filetype, fname)
end
return pandoc.Para({pandoc.Image({}, fbasename)})
else
return el
end
end