Initial implementation of logDiffIfDirty

src/model/input.js

@@ -77,6 +77,12 @@ class Input {
     return input === 'true' ? 'true' : 'false';
   }
 
+  static get logDiffIfDirty() {
+    const input = core.getInput('logDiffIfDirty') || 'false';
+
+    return input === 'true' ? 'true' : 'false';
+  }
+
   static get customParameters() {
     return core.getInput('customParameters') || '';
   }

src/model/input.test.js

@@ -232,6 +232,24 @@ describe('Input', () => {
     });
   });
 
+  describe('logDiffIfDirty', () => {
+    it('returns the default value', () => {
+      expect(Input.logDiffIfDirty).toStrictEqual('false');
+    });
+
+    it('returns true when string true is passed', () => {
+      const spy = jest.spyOn(core, 'getInput').mockReturnValue('true');
+      expect(Input.logDiffIfDirty).toStrictEqual('true');
+      expect(spy).toHaveBeenCalledTimes(1);
+    });
+
+    it('returns false when string false is passed', () => {
+      const spy = jest.spyOn(core, 'getInput').mockReturnValue('false');
+      expect(Input.logDiffIfDirty).toStrictEqual('false');
+      expect(spy).toHaveBeenCalledTimes(1);
+    });
+  });
+
   describe('customParameters', () => {
     it('returns the default value', () => {
       expect(Input.customParameters).toStrictEqual('');

src/model/versioning.js

@@ -13,6 +13,10 @@ export default class Versioning {
     return Input.allowDirtyBuild === 'true';
   }
 
+  static get logDiffIfDirty() {
+    return Input.logDiffIfDirty === 'true';
+  }
+
   static get strategies() {
     return { None: 'None', Semantic: 'Semantic', Tag: 'Tag', Custom: 'Custom' };
   }
@@ -178,7 +182,12 @@ export default class Versioning {
   static async isDirty() {
     const output = await this.git(['status', '--porcelain']);
 
-    return output !== '';
+    const dirty = output !== '';
+    if (dirty && this.logDiffIfDirty) {
+      await this.git(['--no-pager', 'diff']);
+    }
+
+    return dirty;
   }
 
   /**