lib/git/gsub.rb in git-gsub-0.0.1 vs lib/git/gsub.rb in git-gsub-0.0.2

@@ -15,13 +15,30 @@
     def self.version
       puts Git::Gsub::VERSION
     end
 
     def self.gsub *args
-      from, to, path, = args
+      from, to, path, = args.map do |arg|
+        Shellwords.escape arg if arg
+      end
 
+      if to.nil?
+        abort "No argument to gsub was given"
+      end
+
       target_files = (`git grep -l #{from} #{path}`).each_line.map(&:chomp).join ' '
 
-      system %|gsed -i s/#{Shellwords.escape from}/#{Shellwords.escape to}/g #{target_files}|
+      if system_support_gsed?
+        system %|gsed -i "" s/#{from}/#{to}/g #{target_files}|
+      else
+        system %|sed -i "" -e s/#{from}/#{to}/g #{target_files}|
+      end
+    end
+
+    private
+
+    def self.system_support_gsed?
+      `which gsed`
+      $?.success?
     end
   end
 end