Adds options to control overwiting behaviors.

README.md

@@ -157,8 +157,7 @@ replacements: [{
 
 ### options
 
-*options* is an object, specific to a target, and the only supported option is 
-*processTemplates*
+*options* is an object, specific to a target, currently supports these settings:
 
 #### processTemplates
 
@@ -186,9 +185,52 @@ replace: {
 }
 ```
 
-
 [grunt.template]: https://github.com/gruntjs/grunt/wiki/grunt.template
 
+#### forceOverwrite
+
+**forceOverwrite** when set to true (by default it is false) force overwrites the 
+file even if the result(after replacing) is identical with the source(before replacing).
+
+```javascript
+replace: {
+  forceCopy_example: {
+    src: ['text/*.txt'],
+    overwrite: true,
+    options: {
+      forceOverwrite: true
+    },
+    replacements: [{ 
+      from: 'foo',
+      to: 'bar'
+    }]
+  }
+}
+```
+
+#### forceCopy
+
+**forceCopy** when set to false (by default it is true) prevents from copying when the
+result(after replacing) is identical with the source(before replacing).
+
+```javascript
+replace: {
+  forceCopy_example: {
+    src: ['text/*.txt'],
+    dest: 'build/text/',
+    options: {
+      forceCopy: false
+    },
+    replacements: [{ 
+      from: 'foo',
+      to: 'bar'
+    }]
+  }
+}
+```
+
+
+
 ## Road map
 Some changes I'm considering. Happy to receive suggestions for/against:
 

lib/grunt-text-replace.js

@@ -41,7 +41,19 @@ gruntTextReplace = {
     var replacements = settings.replacements;
     grunt.file.copy(pathToSourceFile, pathToDestinationFile, {
       process: function (text) {
-        return gruntTextReplace.replaceTextMultiple(text, replacements);
+        var content = gruntTextReplace.replaceTextMultiple(text, replacements);
+        var identical = content === text;
+        var overwrite = pathToSourceFile === pathToDestinationFile;
+        var forceCopy = gruntTextReplace.forceSettings.forceCopy;
+        var forceOverwrite = gruntTextReplace.forceSettings.forceOverwrite;
+        if (
+            (identical && overwrite && !forceOverwrite) ||
+            (identical && !overwrite && !forceCopy)
+          ){
+          return false;
+        }else{
+          return content;
+        }
       }
     });
   },
@@ -171,6 +183,23 @@ gruntTextReplace = {
       isProcessTemplateTrue = false;
     }
     return isProcessTemplateTrue ? grunt.template.process(string) : string;
-  }
+  },
 
-}
+  forceSettings: (function(){
+    var forceCopy = true;
+    var forceOverwrite = false;
+
+    if (grunt.task.current.data &&
+        grunt.task.current.data.options && 
+        grunt.task.current.data.options.forceCopy === false){
+      forceCopy = false;
+    }
+    if (grunt.task.current.data &&
+        grunt.task.current.data.options && 
+        grunt.task.current.data.options.forceOverwrite === true){
+      forceOverwrite = true;
+    }
+
+    return {'forceCopy' : forceCopy, 'forceOverwrite': forceOverwrite};
+  })()
+};