Class: Berkshelf::Visualizer

Inherits:
Object
  • Object
show all
Includes:
Buff::ShellOut
Defined in:
lib/berkshelf/visualizer.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Visualizer

Returns a new instance of Visualizer.



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# File 'lib/berkshelf/visualizer.rb', line 23

def initialize
  @nodes = {}
end

Class Method Details

.from_lockfile(lockfile) ⇒ Object 



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# File 'lib/berkshelf/visualizer.rb', line 8

def from_lockfile(lockfile)
  new.tap do |instance|
    lockfile.graph.each do |item|
      instance.node(item.name)

      item.dependencies.each do |name, version|
        instance.edge(item.name, name, version)
      end
    end
  end
end

Instance Method Details

#adjacencies(object) ⇒ Object 



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# File 'lib/berkshelf/visualizer.rb', line 47

def adjacencies(object)
  @nodes[object] || Set.new
end

#each_node(&block) ⇒ Object 



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# File 'lib/berkshelf/visualizer.rb', line 36

def each_node(&block)
  nodes.each(&block)
end

#edge(a, b, version) ⇒ Object 



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# File 'lib/berkshelf/visualizer.rb', line 40

def edge(a, b, version)
  node(a)
  node(b)

  @nodes[a].add(b => version)
end

#node(object) ⇒ Object 



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# File 'lib/berkshelf/visualizer.rb', line 27

def node(object)
  @nodes[object] ||= Set.new
  self
end

#nodes ⇒ Object 



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# File 'lib/berkshelf/visualizer.rb', line 32

def nodes
  @nodes.keys
end

#to_dot ⇒ String

Convert the current graph to a DOT. This is an intermediate step in generating a PNG.

Returns:



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# File 'lib/berkshelf/visualizer.rb', line 55

def to_dot
  out = %|digraph Solve__Graph {\n|

  nodes.each do |node|
    out << %|  "#{node}" [ fontsize = 10, label = "#{node}" ]\n|
  end

  nodes.each do |node|
    adjacencies(node).each do |edge|
      edge.each do |name, version|
        if version == Semverse::DEFAULT_CONSTRAINT
          label = ""
        else
          label = " #{version}"
        end
        out << %|  "#{node}" -> "#{name}" [ fontsize = 10, label = "#{label}" ]\n|
      end
    end
  end

  out << %|}|
  out
end

#to_png(outfile = 'graph.png') ⇒ String

Save the graph visually as a PNG.

Parameters:

  • outfile (String) (defaults to: 'graph.png') —

    the name/path of the file to output

Returns:

  • (String) —

    the path where the file was written



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# File 'lib/berkshelf/visualizer.rb', line 86

def to_png(outfile = 'graph.png')
  tempfile = Tempfile.new('dotdotfile')
  tempfile.write(to_dot)
  tempfile.rewind

  unless Berkshelf.which('dot') || Berkshelf.which('dot.exe')
    raise GraphvizNotInstalled.new
  end

  command = %|dot -T png #{tempfile.path} -o "#{outfile}"|
  response = shell_out(command)

  unless response.success?
    raise GraphvizCommandFailed.new(command, response.stderr)
  end

  File.expand_path(outfile)
ensure
  if tempfile && File.exist?(tempfile.path)
    tempfile.close
    tempfile.unlink
  end
end