66 lines
2.4 KiB
Ruby
66 lines
2.4 KiB
Ruby
class MPost < Nanoc3::Filter
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identifier :mpost
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@@tmp="/tmp/mp/"
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@@name=["Zero","One","Two","Three"]
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def solarized(str)
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str.gsub(
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%r{base0([0123])},'base'+@@name[0]+@@name[$1.to_i]
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).gsub(
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%r{base([0123])},'base'+@@name[$1.to_i]
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).gsub(
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%{red},'s_red'
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).gsub(
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%{blue},'s_blue'
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).gsub(
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%{green},'s_green'
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)
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end
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def run(content, params={})
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content.gsub(%r{<mpost( title="([^"]*)")?>(.+?)</mpost>}m) do |full|
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title=$2
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str=$3
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filename=title.gsub(/[^a-zA-Z0-9_]/,"_")
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# write the mp file using the code
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code=File.read('lib/graph.mp')
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code<<=%{beginfig(1)
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drawoptions (withcolor base01);}
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code <<= str
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code <<= %{\nendfig;\nbye;\n}
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# create the directory to compile metapost files
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FileUtils.mkdir_p(@@tmp)
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# write the code into a temporary file
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File.open(@@tmp+filename+'.mp','w') do |f|
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f.write solarized(code)
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end
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# write the URL of the image
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imgurl=@item.path + 'mpost/' + filename + '.png'
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# We compile only if the source changed
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if not (File.exists?(@@tmp+filename+'.old') and
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FileUtils.cmp(@@tmp+filename+'.mp', @@tmp+filename+'.old'))
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then
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print %{\t[mpost] updating: #{filename}}
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fspath=FileUtils.pwd+'/output'+imgurl
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# create the directory for the output file
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FileUtils.mkdir_p(File.dirname(fspath))
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# Launch the metapost compilation and update
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# the cache in case of success
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cmd="cd #{@@tmp} && mpost #{filename}.mp >/dev/null 2>&1 && convert -density 180 #{filename}.1 #{fspath} >/dev/null"
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if system(cmd)
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if FileUtils.copy(@@tmp+filename+'.mp',@@tmp+filename+'.old')
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puts " [SUCCESS]"
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else
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puts " [ERROR: couldn't copy]"
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end
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else
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puts " [ERROR: compilation error; check #{@@tmp}#{filename}.log ]"
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end
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end
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# replace the code by the image
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%{<figure><img alt="#{title}" src="#{imgurl}"/><figcaption>#{title}</figcaption></figure>}
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end
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end
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end
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