Class: Metanorma::Standoc::PlantUMLBlockMacroBackend

Inherits:
Object
  • Object
show all
Defined in:
lib/metanorma/standoc/macros_plantuml.rb

Class Method Summary collapse

Class Method Details

.generate_attrs(attrs) ⇒ Object 



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# File 'lib/metanorma/standoc/macros_plantuml.rb', line 81

def self.generate_attrs(attrs)
  %w(id align float title role width height alt)
    .inject({}) do |memo, key|
    memo[key] = attrs[key] if attrs.has_key? key
    memo
  end
end

.generate_file(parent, reader) ⇒ Object

if no :imagesdir: leave image file in plantuml sleep need for windows because dot works in separate process and plantuml process may finish earlier then dot, as result png file maybe not created yet after plantuml finish

# Warning: metanorma/metanorma-standoc#187 Windows Ruby 2.4 will crash if a Tempfile is “mv”ed. This is why we need to copy and then unlink.



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# File 'lib/metanorma/standoc/macros_plantuml.rb', line 36

def self.generate_file(parent, reader)
  localdir = Metanorma::Utils::localdir(parent.document)
  imagesdir = parent.document.attr("imagesdir")
  umlfile, outfile = save_plantuml parent, reader, localdir
  run(umlfile, outfile) or
    raise "No image output from PlantUML (#{umlfile}, #{outfile})!"
  umlfile.unlink

  path = path_prep(localdir, imagesdir)
  filename = File.basename(outfile.to_s)
  FileUtils.cp(outfile, path) and outfile.unlink

  imagesdir ? filename : File.join(path, filename)
end

.path_prep(localdir, imagesdir) ⇒ Object 



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# File 'lib/metanorma/standoc/macros_plantuml.rb', line 51

def self.path_prep(localdir, imagesdir)
  path = Pathname.new(localdir) + (imagesdir || "plantuml")
  File.writable?(localdir) or
    raise "Destination path #{path} not writable for PlantUML!"
  path.mkpath
  File.writable?(path) or
    raise "Destination path #{path} not writable for PlantUML!"
  # File.exist?(path) or raise "Destination path #{path} already exists for PlantUML!"
  path
end

.plantuml_bin ⇒ Object 



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# File 'lib/metanorma/standoc/macros_plantuml.rb', line 10

def self.plantuml_bin
  if Gem.win_platform? || which("plantumlc")
    "plantumlc"
  else
    "plantuml"
  end
end

.plantuml_installed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/metanorma/standoc/macros_plantuml.rb', line 4

def self.plantuml_installed?
  unless which("plantuml")
    raise "PlantUML not installed"
  end
end

.prep_source(reader) ⇒ Object 



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# File 'lib/metanorma/standoc/macros_plantuml.rb', line 72

def self.prep_source(reader)
  src = reader.source
  reader.lines.first.sub(/\s+$/, "").match /^@startuml($| )/ or
    src = "@startuml\n#{src}\n@enduml\n"
  %r{@enduml\s*$}m.match?(src) or
    raise "@startuml without matching @enduml in PlantUML!"
  src
end

.run(umlfile, outfile) ⇒ Object 



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# File 'lib/metanorma/standoc/macros_plantuml.rb', line 18

def self.run(umlfile, outfile)
  system "#{plantuml_bin} #{umlfile.path}" or (warn $? and return false)
  i = 0
  until !Gem.win_platform? || File.exist?(outfile) || i == 15
    sleep(1)
    i += 1
  end
  File.exist?(outfile)
end

.save_plantuml(_parent, reader, _localdir) ⇒ Object 



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# File 'lib/metanorma/standoc/macros_plantuml.rb', line 62

def self.save_plantuml(_parent, reader, _localdir)
  src = prep_source(reader)
  /^@startuml (?<fn>[^\n]+)\n/ =~ src
  Tempfile.open(["plantuml", ".pml"], encoding: "utf-8") do |f|
    f.write(src)
    [f, File.join(File.dirname(f.path),
                  "#{fn || File.basename(f.path, '.pml')}.png")]
  end
end

.which(cmd) ⇒ Object

stackoverflow.com/questions/2108727/which-in-ruby-checking-if-program-exists-in-path-from-ruby



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# File 'lib/metanorma/standoc/macros_plantuml.rb', line 90

def self.which(cmd)
  exts = ENV["PATHEXT"] ? ENV["PATHEXT"].split(";") : [""]
  ENV["PATH"].split(File::PATH_SEPARATOR).each do |path|
    exts.each do |ext|
      exe = File.join(path, "#{cmd}#{ext}")
      return exe if File.executable?(exe) && !File.directory?(exe)
    end
  end
  nil
end