Added options.copy (Fixes yeoman#20)

Author: Dean Sofer

tasks/filerev.js

@@ -10,14 +10,14 @@ module.exports = function (grunt) {
     var options = this.options({
       encoding: 'utf8',
       algorithm: 'md5',
-      length: 8
+      length: 8,
+      copy: null
     });
     var target = this.target;
     var filerev = grunt.filerev || {summary: {}};
 
     eachAsync(this.files, function (el, i, next) {
-      var move = true;
-      
+
       // If dest is furnished it should indicate a directory
       if (el.dest) {
         // When globbing is used, el.dest contains basename, we remove it
@@ -34,8 +34,6 @@ module.exports = function (grunt) {
           grunt.log.writeln('Destination dir ' + el.dest + ' does not exists for target ' + target + ': creating');
           grunt.file.mkdir(el.dest);
         }
-        // We need to copy file as we now have a dest different from the src
-        move = false;
       }
 
       el.src.forEach(function (file) {
@@ -46,14 +44,20 @@ module.exports = function (grunt) {
         var newName = [path.basename(file, ext), suffix, ext.slice(1)].join('.');
         var resultPath;
 
-        if (move) {
-          dirname = path.dirname(file);
-          resultPath = path.resolve(dirname, newName);
-          fs.renameSync(file, resultPath);
-        } else {
-          dirname = el.dest;
-          resultPath = path.resolve(dirname, newName);
+        dirname = el.dest ? el.dest : path.dirname(file);
+        resultPath = path.resolve(dirname, newName);
+
+        if (options.copy === null) {
+          // If options.copy is null, defer to wether or not destination is defined (old behavior)
+          if (el.dest) {
+            grunt.file.copy(file, resultPath);
+          } else {
+            fs.renameSync(file, resultPath);
+          }
+        } else if (options.copy) {
           grunt.file.copy(file, resultPath);
+        } else {
+          fs.renameSync(file, resultPath);
         }
 
         filerev.summary[path.normalize(file)] = path.join(dirname, newName);