Module: GraphViz::Utils

Included in:
Dot2Ruby, GraphViz
Defined in:
lib/graphviz/utils.rb,
lib/graphviz/utils/colors.rb

Defined Under Namespace

Classes: Colors

Instance Method Summary collapse

Instance Method Details

#find_executable(bin, custom_paths) ⇒ Object

Since this code is an adaptation of Launchy::Application#find_executable (copiousfreetime.rubyforge.org/launchy/Launchy/Application.html) it follow is licence :

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED AS IS AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.



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# File 'lib/graphviz/utils.rb', line 20

def find_executable(bin, custom_paths) #:nodoc:
  system_path = ENV['PATH']
  user_given_path = Array(custom_paths).join(File::PATH_SEPARATOR)
  search_path = system_path + File::PATH_SEPARATOR + user_given_path

  search_path.split(File::PATH_SEPARATOR).each do |path|
    file_path = File.join(path,bin)
    return file_path if File.executable?(file_path) and File.file?(file_path)

    if RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ # WAS: elsif RUBY_PLATFORM =~ /mswin|mingw/
      found_ext = (ENV['PATHEXT'] || '.exe;.bat;.com').split(";").find {|ext| File.executable?(file_path + ext) }
      return file_path + found_ext if found_ext
    end
  end
  return nil
end

#output_and_errors_from_command(cmd) ⇒ Object

:nodoc:



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# File 'lib/graphviz/utils.rb', line 37

def output_and_errors_from_command(cmd) #:nodoc:
  unless defined? Open3
    begin
      require 'open3'
      require 'win32/open3'
    rescue LoadError
    end
  end
  begin
    Open3.popen3( *cmd ) do |stdin, stdout, stderr|
      stdin.close
      stdout.binmode
      [stdout.read, stderr.read]
    end
  rescue NotImplementedError, NoMethodError
    IO.popen( *cmd ) do |stdout|
      stdout.binmode
      [stdout.read, nil]
    end
  end
end

#output_from_command(cmd) ⇒ Object

:nodoc:



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# File 'lib/graphviz/utils.rb', line 59

def output_from_command(cmd) #:nodoc:
  output, errors = output_and_errors_from_command(cmd)
  if errors.nil? || errors.strip.empty?
    output
  else
    raise "Error from #{cmd}:\n#{errors}"
  end
end