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lua-filters.md: use pandoc.system module in TikZ example

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Showcase temporary directory handling with `with_temporary_directory`
and `with_working_directory`.
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Albert Krewinkel 2020-05-25 09:10:26 +02:00
parent 2aa0832320
commit 37ef57be51
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1 changed files with 48 additions and 39 deletions
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doc/lua-filters.md
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@ -653,59 +653,68 @@ document is built. (A more sophisticated version of this might
put these in a special cache directory.)
``` lua
local system = require 'pandoc.system'
local tikz_doc_template = [[
\documentclass{standalone}
\usepackage{xcolor}
\usepackage{tikz}
\begin{document}
\nopagecolor
%s
\end{document}
]]
local function tikz2image(src, filetype, outfile)
local tmp = os.tmpname()
local tmpdir = string.match(tmp, "^(.*[\\/])") or "."
local f = io.open(tmp .. ".tex", 'w')
f:write("\\documentclass{standalone}\n\\usepackage{xcolor}\n\\usepackage{tikz}\n\\begin{document}\n\\nopagecolor\n")
f:write(src)
f:write("\n\\end{document}\n")
f:close()
os.execute("pdflatex -output-directory " .. tmpdir .. " " .. tmp)
if filetype == 'pdf' then
os.rename(tmp .. ".pdf", outfile)
else
os.execute("pdf2svg " .. tmp .. ".pdf " .. outfile)
end
os.remove(tmp .. ".tex")
os.remove(tmp .. ".pdf")
os.remove(tmp .. ".log")
os.remove(tmp .. ".aux")
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')
if filetype == 'pdf' then
os.rename('tikz.pdf', outfile)
else
os.execute('pdf2svg tikz.pdf ' .. outfile)
end
end)
end)
end
extension_for = {
html = 'svg',
html4 = 'svg',
html5 = 'svg',
latex = 'pdf',
beamer = 'pdf' }
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
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
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 fname = pandoc.sha1(el.text) .. "." .. filetype
if not file_exists(fname) then
tikz2image(el.text, filetype, fname)
end
return pandoc.Para({pandoc.Image({}, fname)})
else
return el
if starts_with('\\begin{tikzpicture}', el.text) then
local filetype = extension_for[FORMAT] or 'svg'
local fname = system.get_working_directory() .. '/' ..
pandoc.sha1(el.text) .. '.' .. filetype
if not file_exists(fname) then
tikz2image(el.text, filetype, fname)
end
return pandoc.Para({pandoc.Image({}, fname)})
else
return el
end
end
```