Do not use shellescape on Windows + Remove Gemfile.lock

.gitignore

@@ -17,6 +17,7 @@ tmtags
 coverage
 rdoc
 pkg
+Gemfile.lock
 
 ## PROJECT::SPECIFIC
 .bundle

lib/pdfkit/pdfkit.rb

@@ -1,3 +1,4 @@
+require 'rbconfig'
 require 'shellwords'
 
 class PDFKit
@@ -44,7 +45,11 @@ def command(path = nil)
 
     args << (path || '-') # Write to file or stdout
 
-    args.shelljoin
+    if RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ # Windows
+      args.map{|str| str =~ /\s/ ? "\"#{str.gsub('"', '\"')}\"" : str}.join(' ')
+    else # Linux, OSX
+      args.shelljoin
+    end
   end
 
   def executable

spec/pdfkit_spec.rb

@@ -72,14 +72,32 @@
       pdfkit.command.should_not include('--disable-smart-shrinking')
     end
 
-    it "should encapsulate string arguments in quotes" do
-      pdfkit = PDFKit.new('html', :header_center => "foo [page]")
-      pdfkit.command.should include "--header-center foo\\ \\[page\\]"
+    context "on Linux platform" do
+      before { stub_const("RbConfig::CONFIG", {'host_os' => 'linux'}) }
+
+      it "should encapsulate string arguments in quotes" do
+        pdfkit = PDFKit.new('html', :header_center => "foo [page]")
+        pdfkit.command.should include "--header-center foo\\ \\[page\\]"
+      end
+
+      it "should sanitize string arguments" do
+        pdfkit = PDFKit.new('html', :header_center => "$(ls)")
+        pdfkit.command.should include "--header-center \\$\\(ls\\)"
+      end
     end
 
-    it "should sanitize string arguments" do
-      pdfkit = PDFKit.new('html', :header_center => "$(ls)")
-      pdfkit.command.should include "--header-center \\$\\(ls\\)"
+    context "on Windows platform" do
+      before { stub_const("RbConfig::CONFIG", {'host_os' => 'mingw'}) }
+
+      it "should encapsulate string arguments in quotes" do
+        pdfkit = PDFKit.new('html', :header_center => "foo [\"page\"]")
+        pdfkit.command.should include "--header-center \"foo [\\\"page\\\"]\""
+      end
+
+      it "should not sanitize string arguments" do
+        pdfkit = PDFKit.new('html', :header_center => "$(ls)")
+        pdfkit.command.should include "--header-center $(ls)"
+      end
     end
 
     it "read the source from stdin if it is html" do