Module: MicroMagick

Defined in:
lib/micro_magick.rb,
lib/micro_magick/image.rb,
lib/micro_magick/version.rb,
lib/micro_magick/identify_parser.rb

Defined Under Namespace

Classes: IdentifyParser, Image

Constant Summary collapse

Error = 
Class.new(StandardError)
NoSuchFile = 
Class.new(Error)
MissingBinaries = 
Class.new(Error)
ArgumentError = 
Class.new(Error)
CorruptImageError = 
Class.new(Error)
Geometry =

Aliases to support < v0.0.6

Convert = Image
VERSION = 
Gem::Version.new('1.0.1')

Class Method Summary collapse

Class Method Details

.cmd_prefix ⇒ Object 



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# File 'lib/micro_magick.rb', line 50

def self.cmd_prefix
  @cmd_prefix ||= begin
    if system('hash gm 2>&-')
      'gm '
    elsif system('hash convert 2>&-')
      ''
    else
      raise MissingBinaries, 'Please install either GraphicsMagick or ImageMagick'
    end
  end
end

.exec(cmds, return_stdout = false) ⇒ Object 



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# File 'lib/micro_magick.rb', line 62

def self.exec(cmds, return_stdout = false)
  final_cmd = cmd_prefix + cmds.join(' ')
  stdout, stderr, status = Open3.capture3(final_cmd)
  err = stderr.strip
  if err.size > 0 || status != 0
    error = if err =~ /unrecognized option/i
              ArgumentError
            elsif err =~ /corrupt/i
              CorruptImageError
            elsif err =~ /no such file or directory|unable to open/i
              NoSuchFile
            else
              Error
            end
    raise error, "#{final_cmd} failed (#{status}): #{err}"
  end
  return_stdout ? stdout.strip : final_cmd
rescue Errno::ENOENT => e
  raise NoSuchFile, e.message
end

.graphicsmagick? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/micro_magick.rb', line 24

def self.graphicsmagick?
  cmd_prefix == 'gm '
end

.imagemagick? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/micro_magick.rb', line 28

def self.imagemagick?
  !graphicsmagick?
end

.reset! ⇒ Object 



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# File 'lib/micro_magick.rb', line 32

def self.reset!
  @cmd_prefix = @verbose_version = @version = nil
end

.use_graphicsmagick! ⇒ Object 



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# File 'lib/micro_magick.rb', line 19

def self.use_graphicsmagick!
  reset!
  @cmd_prefix = 'gm '
end

.use_imagemagick! ⇒ Object 



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# File 'lib/micro_magick.rb', line 14

def self.use_imagemagick!
  reset!
  @cmd_prefix = ''
end

.verbose_version ⇒ Object 



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# File 'lib/micro_magick.rb', line 36

def self.verbose_version
  @verbose_version ||= begin
    cmd = graphicsmagick? ? %w(version) : %w(identify --version)
    exec(cmd, true)
  end
end

.version ⇒ Object 



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# File 'lib/micro_magick.rb', line 43

def self.version
  @version ||= begin
    m = verbose_version.split($/, 1).first.match(/([\d\.]{5,})/)
    Gem::Version.new(m[1]) if m
  end
end