def tex2img( *args, &block )
opts = args.last.instance_of?(Hash) ? args.pop : {}
name = args.first
raise 'TeX graphics must have a name' if name.nil?
text = capture_erb(&block)
return if text.empty?
defaults = ::Webby.site.tex2img
path = opts.getopt(:path, defaults.path)
type = opts.getopt(:type, defaults.type)
bg = opts.getopt(:bg, defaults.bg)
fg = opts.getopt(:fg, defaults.fg)
res = opts.getopt(:resolution, defaults.resolution)
fg = fg =~ %r/^[a-zA-Z]+$/ ? fg : "\"#{fg}\""
bg = bg =~ %r/^[a-zA-Z]+$/ ? bg : "\"#{bg}\""
image_fn = path.nil? ? name.dup : ::File.join(path, name)
image_fn = ::File.join('', image_fn) << '.' << type
out_dir = ::Webby.site.output_dir
out_file = ::File.join('..', out_dir, image_fn)
FileUtils.mkpath(::File.join(out_dir, path)) unless path.nil?
tex = "\\\\nonstopmode\n\\\\documentclass{article}\n\\\\usepackage[T1]{fontenc}\n\\\\usepackage{amsmath,amsfonts,amssymb,wasysym,latexsym,marvosym,txfonts}\n\\\\usepackage[pdftex]{color}\n\\\\pagestyle{empty}\n\\\\begin{document}\n\\\\fontsize{12}{24}\n\\\\selectfont\n\\\\color{white}\n\\\\pagecolor{black}\n\\\\[\n\#{text}\n\\\\]\n\\\\end{document}\n"
tex.gsub!(%r/\n\s+/, "\n").strip!
pwd = Dir.pwd
tmpdir = ::Webby::MkTemp.mktempdir('tex2img_XXXXXX')
begin
Dir.chdir(tmpdir)
File.open('out.tex', 'w') {|fd| fd.puts tex}
dev_null = test(?e, "/dev/null") ? "/dev/null" : "NUL:"
%x[pdflatex -interaction=batchmode out.tex &> #{dev_null}]
convert = "\\( -density #{res} out.pdf -trim +repage \\) "
convert << "\\( -clone 0 -negate -background #{fg} -channel A -combine \\) "
convert << "\\( -clone 0 -background #{bg} -channel A -combine \\) "
convert << "-delete 0 -compose dst-over -composite #{out_file}"
%x[convert #{convert} &> #{dev_null}]
ensure
Dir.chdir(pwd)
FileUtils.rm_rf(tmpdir) if test(?e, tmpdir)
end
out = "<img src=\"#{image_fn}\""
%w[class style id alt].each do |atr|
val = opts.getopt(atr)
next if val.nil?
out << " %s=\"%s\"" % [atr, val]
end
out << " />\n"
out = _guard(out)
concat_erb(out, block.binding)
return
end