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289 lines (261 loc) · 7.85 KB
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require "mini_magick/shell"
module MiniMagick
##
# Abstract class that wraps command-line tools. It shouldn't be used directly,
# but through one of its subclasses (e.g. {MiniMagick::Tool::Mogrify}). Use
# this class if you want to be closer to the metal and execute ImageMagick
# commands directly, but still with a nice Ruby interface.
#
# @example
# MiniMagick::Tool::Mogrify.new do |builder|
# builder.resize "500x500"
# builder << "path/to/image.jpg"
# end
#
class Tool
CREATION_OPERATORS = %w[xc canvas logo rose gradient radial-gradient plasma
pattern text pango]
##
# Aside from classic instantiation, it also accepts a block, and then
# executes the command in the end.
#
# @example
# version = MiniMagick::Tool::Identify.new { |b| b.version }
# puts version
#
# @return [MiniMagick::Tool, String] If no block is given, returns an
# instance of the tool, if block is given, returns the output of the
# command.
#
def self.new(*args)
instance = super(*args)
if block_given?
yield instance
instance.call
else
instance
end
end
# @private
attr_reader :name, :args
# @param whiny [Boolean] Whether to raise errors on exit codes different
# than 0.
# @example
# MiniMagick::Tool::Identify.new(whiny: false) do |identify|
# identify.help # returns exit status 1, which would otherwise throw an error
# end
def initialize(name, options = {})
warn "MiniMagick::Tool.new(false) is deprecated and will be removed in MiniMagick 5, use MiniMagick::Tool.new(whiny: false) instead." if !options.is_a?(Hash)
@name = name
@args = []
@whiny = options.is_a?(Hash) ? options.fetch(:whiny, MiniMagick.whiny) : options
end
##
# Executes the command that has been built up.
#
# @example
# mogrify = MiniMagick::Tool::Mogrify.new
# mogrify.resize("500x500")
# mogrify << "path/to/image.jpg"
# mogrify.call # executes `mogrify -resize 500x500 path/to/image.jpg`
#
# @example
# mogrify = MiniMagick::Tool::Mogrify.new
# # build the command
# mogrify.call do |stdout, stderr, status|
# # ...
# end
#
# @yield [Array] Optionally yields stdout, stderr, and exit status
#
# @return [String] Returns the output of the command
#
def call(*args)
options = args[-1].is_a?(Hash) ? args.pop : {}
warn "Passing whiny to MiniMagick::Tool#call is deprecated and will be removed in MiniMagick 5, use MiniMagick::Tool.new(whiny: false) instead." if args.any?
whiny = args.fetch(0, @whiny)
options[:whiny] = whiny
options[:stderr] = false if block_given?
shell = MiniMagick::Shell.new
stdout, stderr, status = shell.run(command, options)
yield stdout, stderr, status if block_given?
stdout.chomp("\n")
end
##
# The currently built-up command.
#
# @return [Array<String>]
#
# @example
# mogrify = MiniMagick::Tool::Mogrify.new
# mogrify.resize "500x500"
# mogrify.contrast
# mogrify.command #=> ["mogrify", "-resize", "500x500", "-contrast"]
#
def command
[*executable, *args]
end
##
# The executable used for this tool. Respects
# {MiniMagick::Configuration#cli} and {MiniMagick::Configuration#cli_path}.
#
# @return [Array<String>]
#
# @example
# MiniMagick.configure { |config| config.cli = :graphicsmagick }
# identify = MiniMagick::Tool::Identify.new
# identify.executable #=> ["gm", "identify"]
#
def executable
exe = [name]
exe.unshift "gm" if MiniMagick.graphicsmagick?
exe.unshift File.join(MiniMagick.cli_path, exe.shift) if MiniMagick.cli_path
exe
end
##
# Appends raw options, useful for appending image paths.
#
# @return [self]
#
def <<(arg)
args << arg.to_s
self
end
##
# Merges a list of raw options.
#
# @return [self]
#
def merge!(new_args)
new_args.each { |arg| self << arg }
self
end
##
# Changes the last operator to its "plus" form.
#
# @example
# MiniMagick::Tool::Mogrify.new do |mogrify|
# mogrify.antialias.+
# mogrify.distort.+("Perspective", "0,0,4,5 89,0,45,46")
# end
# # executes `mogrify +antialias +distort Perspective '0,0,4,5 89,0,45,46'`
#
# @return [self]
#
def +(*values)
args[-1] = args[-1].sub(/^-/, '+')
self.merge!(values)
self
end
##
# Create an ImageMagick stack in the command (surround.
#
# @example
# MiniMagick::Tool::Convert.new do |convert|
# convert << "wand.gif"
# convert.stack do |stack|
# stack << "wand.gif"
# stack.rotate(30)
# end
# convert.append.+
# convert << "images.gif"
# end
# # executes `convert wand.gif \( wizard.gif -rotate 30 \) +append images.gif`
#
def stack
self << "("
yield self
self << ")"
end
##
# Adds ImageMagick's pseudo-filename `-` for standard input.
#
# @example
# identify = MiniMagick::Tool::Identify.new
# identify.stdin
# identify.call(stdin: image_content)
# # executes `identify -` with the given standard input
#
def stdin
self << "-"
end
##
# Adds ImageMagick's pseudo-filename `-` for standard output.
#
# @example
# content = MiniMagick::Tool::Convert.new do |convert|
# convert << "input.jpg"
# convert.auto_orient
# convert.stdout
# end
# # executes `convert input.jpg -auto-orient -` which returns file contents
#
def stdout
self << "-"
end
##
# Define creator operator methods
#
# mogrify = MiniMagick::Tool.new("mogrify")
# mogrify.canvas("khaki")
# mogrify.command.join(" ") #=> "mogrify canvas:khaki"
#
CREATION_OPERATORS.each do |operator|
define_method(operator.gsub('-', '_')) do |value = nil|
self << "#{operator}:#{value}"
self
end
end
##
# This option is a valid ImageMagick option, but it's also a Ruby method,
# so we need to override it so that it correctly acts as an option method.
#
def clone(*args)
self << '-clone'
self.merge!(args)
self
end
##
# Any undefined method will be transformed into a CLI option
#
# mogrify = MiniMagick::Tool.new("mogrify")
# mogrify.adaptive_blur("...")
# mogrify.foo_bar
# mogrify.command.join(" ") "mogrify -adaptive-blur ... -foo-bar"
#
def method_missing(name, *args)
option = "-#{name.to_s.tr('_', '-')}"
self << option
self.merge!(args)
self
end
def respond_to_missing?(method_name, include_private = false)
true
end
def self.option_methods
@option_methods ||= (
tool = new(whiny: false)
tool << "-help"
help_page = tool.call(stderr: false)
cli_options = help_page.scan(/^\s+-[a-z\-]+/).map(&:strip)
if tool.name == "mogrify" && MiniMagick.graphicsmagick?
# These options were undocumented before 2015-06-14 (see gm bug 302)
cli_options |= %w[-box -convolve -gravity -linewidth -mattecolor -render -shave]
end
cli_options.map { |o| o[1..-1].tr('-','_') }
)
end
end
end
require "mini_magick/tool/animate"
require "mini_magick/tool/compare"
require "mini_magick/tool/composite"
require "mini_magick/tool/conjure"
require "mini_magick/tool/convert"
require "mini_magick/tool/display"
require "mini_magick/tool/identify"
require "mini_magick/tool/import"
require "mini_magick/tool/mogrify"
require "mini_magick/tool/mogrify_restricted"
require "mini_magick/tool/montage"
require "mini_magick/tool/stream"