util: countLines func

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

__tests__/util.test.ts

@@ -380,6 +380,42 @@ describe('stringToUnicodeEntities', () => {
   });
 });
 
+describe('countLines', () => {
+  it('counts total number of lines correctly', () => {
+    const text = `This
+
+is
+a
+sample
+
+text
+with
+multiple
+lines`;
+
+    const result = Util.countLines(text);
+    expect(result).toEqual(10); // Including empty lines
+  });
+  it('handles edge case with empty string', () => {
+    const text = '';
+
+    const result = Util.countLines(text);
+    expect(result).toEqual(1); // Empty string should have 1 line
+  });
+  it('handles edge case with single line', () => {
+    const text = 'Single line text';
+
+    const result = Util.countLines(text);
+    expect(result).toEqual(1); // Single line should have 1 line
+  });
+  it('handles multiple types of line breaks', () => {
+    const text = `Line 1\r\nLine 2\rLine 3\nLine 4`;
+
+    const result = Util.countLines(text);
+    expect(result).toEqual(4); // Different line break types should be counted correctly
+  });
+});
+
 // See: https://github.com/actions/toolkit/blob/a1b068ec31a042ff1e10a522d8fdf0b8869d53ca/packages/core/src/core.ts#L89
 function getInputName(name: string): string {
   return `INPUT_${name.replace(/ /g, '_').toUpperCase()}`;

src/util.ts

@@ -185,4 +185,8 @@ export class Util {
       .map(char => `&#x${char.charCodeAt(0).toString(16)};`)
       .join('');
   }
+
+  public static countLines(input: string): number {
+    return input.split(/\r\n|\r|\n/).length;
+  }
 }