Pass filename as last arg to replacer function (#34)

* Pass filename as last arg to replacer function

* - Cleaned up replacer function override to use ES6
- Added replacer function tests to Async callback & Sync specs

lib/helpers/make-replacements.js

@@ -16,7 +16,7 @@ function getReplacement(replace, isArray, i) {
 /**
  * Helper to make replacements
  */
-module.exports = function makeReplacements(contents, from, to) {
+module.exports = function makeReplacements(contents, from, to, file) {
 
   //Turn into array
   if (!Array.isArray(from)) {
@@ -30,10 +30,14 @@ module.exports = function makeReplacements(contents, from, to) {
   from.forEach((item, i) => {
 
     //Get replacement value
-    const replacement = getReplacement(to, isArray, i);
+    let replacement = getReplacement(to, isArray, i);
     if (replacement === null) {
       return;
     }
+    if (typeof replacement === 'function') {
+      const original = replacement;
+      replacement = (...args) => original(...args, file);
+    }
 
     //Make replacement
     contents = contents.replace(item, replacement);

lib/helpers/replace-async.js

@@ -18,7 +18,7 @@ module.exports = function replaceAsync(file, from, to, enc) {
       }
 
       //Replace contents and check if anything changed
-      let newContents = makeReplacements(contents, from, to);
+      let newContents = makeReplacements(contents, from, to, file);
       if (newContents === contents) {
         return resolve({file, hasChanged: false});
       }

lib/helpers/replace-sync.js

@@ -15,7 +15,7 @@ module.exports = function replaceSync(file, from, to, enc) {
   const contents = fs.readFileSync(file, enc);
 
   //Replace contents and check if anything changed
-  const newContents = makeReplacements(contents, from, to);
+  const newContents = makeReplacements(contents, from, to, file);
   if (newContents === contents) {
     return false;
   }

lib/replace-in-file.spec.js

@@ -82,6 +82,25 @@ describe('Replace in file', () => {
       });
     });
 
+    it('should pass the match as first arg and file as last arg to a replacer function replace contents in a single file with regex', done => {
+      replace({
+        files: 'test1',
+        from: /re\splace/g,
+        to: (match, ...args) => {
+          const file = args.pop();
+          expect(match).to.equal('re place');
+          expect(file).to.equal('test1');
+          return 'b';
+        }
+      }).then(() => {
+        const test1 = fs.readFileSync('test1', 'utf8');
+        const test2 = fs.readFileSync('test2', 'utf8');
+        expect(test1).to.equal('a b c');
+        expect(test2).to.equal(testData);
+        done();
+      });
+    });
+
     it('should replace contents with a string replacement', done => {
       replace({
         files: 'test1',
@@ -94,6 +113,23 @@ describe('Replace in file', () => {
       });
     });
 
+    it('should pass the match as first arg and file as last arg to a replacer function and replace contents with a string replacement', done => {
+      replace({
+        files: 'test1',
+        from: 're place',
+        to: (match, ...args) => {
+          const file = args.pop();
+          expect(match).to.equal('re place');
+          expect(file).to.equal('test1');
+          return 'b';
+        }
+      }).then(() => {
+        const test1 = fs.readFileSync('test1', 'utf8');
+        expect(test1).to.equal('a b c');
+        done();
+      });
+    });
+
     it('should replace contents in a an array of files', done => {
       replace({
         files: ['test1', 'test2'],
@@ -327,6 +363,25 @@ describe('Replace in file', () => {
       });
     });
 
+    it('should pass the match as first arg and file as last arg to a replacer function replace contents in a single file with regex', done => {
+      replace({
+        files: 'test1',
+        from: /re\splace/g,
+        to: (match, ...args) => {
+          const file = args.pop();
+          expect(match).to.equal('re place');
+          expect(file).to.equal('test1');
+          return 'b';
+        }
+      }, () => {
+        const test1 = fs.readFileSync('test1', 'utf8');
+        const test2 = fs.readFileSync('test2', 'utf8');
+        expect(test1).to.equal('a b c');
+        expect(test2).to.equal(testData);
+        done();
+      });
+    });
+
     it('should replace contents with a string replacement', done => {
       replace({
         files: 'test1',
@@ -339,6 +394,23 @@ describe('Replace in file', () => {
       });
     });
 
+    it('should pass the match as first arg and file as last arg to a replacer function and replace contents with a string replacement', done => {
+      replace({
+        files: 'test1',
+        from: 're place',
+        to: (match, ...args) => {
+          const file = args.pop();
+          expect(match).to.equal('re place');
+          expect(file).to.equal('test1');
+          return 'b';
+        }
+      }, () => {
+        const test1 = fs.readFileSync('test1', 'utf8');
+        expect(test1).to.equal('a b c');
+        done();
+      });
+    });
+
     it('should replace contents in a an array of files', done => {
       replace({
         files: ['test1', 'test2'],
@@ -607,6 +679,23 @@ describe('Replace in file', () => {
       expect(test2).to.equal(testData);
     });
 
+    it('should pass the match as first arg and file as last arg to a replacer function replace contents in a single file with regex', function() {
+      replace.sync({
+        files: 'test1',
+        from: /re\splace/g,
+        to: (match, ...args) => {
+          const file = args.pop();
+          expect(match).to.equal('re place');
+          expect(file).to.equal('test1');
+          return 'b';
+        }
+      });
+      const test1 = fs.readFileSync('test1', 'utf8');
+      const test2 = fs.readFileSync('test2', 'utf8');
+      expect(test1).to.equal('a b c');
+      expect(test2).to.equal(testData);
+    });
+
     it('should replace contents with a string replacement', function() {
       replace.sync({
         files: 'test1',
@@ -617,6 +706,21 @@ describe('Replace in file', () => {
       expect(test1).to.equal('a b c');
     });
 
+    it('should pass the match as first arg and file as last arg to a replacer function and replace contents with a string replacement', function() {
+      replace.sync({
+        files: 'test1',
+        from: 're place',
+        to: (match, ...args) => {
+          const file = args.pop();
+          expect(match).to.equal('re place');
+          expect(file).to.equal('test1');
+          return 'b';
+        }
+      });
+      const test1 = fs.readFileSync('test1', 'utf8');
+      expect(test1).to.equal('a b c');
+    });
+
     it('should replace contents in a an array of files', function() {
       replace.sync({
         files: ['test1', 'test2'],