Merge pull request #22 from Rubikan/master

Solution for Issue #21

Author: jonmagic

README.textile

@@ -63,6 +63,16 @@ We also support using other processors (the default is whatever version of Image
   pdf = Grim.reap('/path/to/pdf)
 </code></pre>
 
+It is also supported to use another ghostscript executable, which is especially interesting for windows users since the executable is named differently there.
+
+<pre><code>
+  # specifying another ghostscript executable, win64 in this example
+  # the ghostscript/bin folder still has to be in the PATH for this to work
+  Grim.processor =  Grim::ImageMagickProcessor.new({:ghostscript_path => "gswin64c.exe"})
+
+  pdf = Grim.reap('/path/to/pdf')
+</code></pre>
+
 h2. Reference
 
 * "jonmagic.com: Grim":http://jonmagic.com/blog/archives/2011/09/06/grim/

lib/grim/image_magick_processor.rb

@@ -3,18 +3,19 @@ class ImageMagickProcessor
 
     # ghostscript prints out a warning, this regex matches it
     WarningRegex = /\*\*\*\*.*\n/
+    DefaultImagemagickPath = 'convert'
+    DefaultGhostScriptPath = 'gs'
 
     def initialize(options={})
-      @imagemagick_path = options[:imagemagick_path] || 'convert'
-      @ghostscript_path = options[:ghostscript_path]
+      @imagemagick_path = options[:imagemagick_path] || DefaultImagemagickPath
+      @ghostscript_path = options[:ghostscript_path] || DefaultGhostScriptPath
       @original_path        = ENV['PATH']
     end
 
     def count(path)
-      command = ["-dNODISPLAY", "-q",
+      command = [@ghostscript_path, "-dNODISPLAY", "-q",
         "-sFile=#{Shellwords.shellescape(path)}",
         File.expand_path('../../../lib/pdf_info.ps', __FILE__)]
-      @ghostscript_path ? command.unshift(@ghostscript_path) : command.unshift('gs')
       result = `#{command.join(' ')}`
       result.gsub(WarningRegex, '').to_i
     end
@@ -28,7 +29,7 @@ def save(pdf, index, path, options)
         "-quality", quality.to_s, "-colorspace", colorspace,
         "-interlace", "none", "-density", density.to_s,
         "#{Shellwords.shellescape(pdf.path)}[#{index}]", path]
-      command.unshift("PATH=#{File.dirname(@ghostscript_path)}:#{ENV['PATH']}") if @ghostscript_path
+      command.unshift("PATH=#{File.dirname(@ghostscript_path)}:#{ENV['PATH']}") if @ghostscript_path && @ghostscript_path != DefaultGhostScriptPath
 
       result = `#{command.join(' ')}`
 

spec/lib/grim/image_magick_processor_spec.rb

@@ -20,6 +20,16 @@
     end
   end
 
+  describe "#count with windows executable", :windows => true do
+    before(:each) do
+      @processor = Grim::ImageMagickProcessor.new({:ghostscript_path => "gswin64c.exe"})
+    end
+
+    it "should return page count" do
+      expect(@processor.count(fixture_path("smoker.pdf"))).to eq(25)
+    end
+  end
+
   describe "#save" do
     before(:all) do
       @path = tmp_path("to_png_spec.png")

spec/spec_helper.rb

@@ -2,6 +2,7 @@
 require 'benchmark'
 require 'rubygems'
 require 'bundler/setup'
+require 'rbconfig'
 
 require 'grim'
 
@@ -28,4 +29,5 @@ def tmp_path(name)
 
 RSpec.configure do |config|
   config.include(FileHelpers)
+  config.filter_run_excluding :windows => true if RbConfig::CONFIG['host_os'].match(/mswin|mingw|cygwin/) == nil
 end