Module: Asciidoctor::Diagram::Which

Included in:
Graphviz, Meme, Mermaid, PlantUml, Shaape, Wavedrom
Defined in:
lib/asciidoctor-diagram/util/which.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.which(cmd, options = {}) ⇒ Object 



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# File 'lib/asciidoctor-diagram/util/which.rb', line 5

def self.which(cmd, options = {})
  exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']

  paths = (options[:path] || []) + ENV['PATH'].split(File::PATH_SEPARATOR)
  paths.each do |path|
    exts.each { |ext|
      exe = File.join(path, "#{cmd}#{ext}")
      return exe if File.executable? exe
    }
  end
  nil
end

Instance Method Details

#which(parent_block, cmd, options = {}) ⇒ Object 



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# File 'lib/asciidoctor-diagram/util/which.rb', line 18

def which(parent_block, cmd, options = {})
  attr_names = options[:attr_names] || [cmd]

  cmd_var = '@' + attr_names[0]

  already_defined = instance_variable_defined?(cmd_var)

  if already_defined
    cmd_path = instance_variable_get(cmd_var)
  else
    cmd_path = attr_names.map { |attr_name| parent_block.document.attributes[attr_name] }.find { |attr| !attr.nil? }
    cmd_path = ::Asciidoctor::Diagram::Which.which(cmd, :path => options[:path]) unless cmd_path && File.executable?(cmd_path)
    instance_variable_set(cmd_var, cmd_path)
    if cmd_path.nil? && options.fetch(:raise_on_error, true)
      raise "Could not find the '#{cmd}' executable in PATH; add it to the PATH or specify its location using the '#{attr_names[0]}' document attribute"
    end
  end

  cmd_path
end