Add Format.clone() method (#11)

* use format ctor to clone format objetcts

* feat: implement format clone by clone method

* remove DeepClone

---------

Co-authored-by: Yohta Kimura <[email protected]>

Author: tamaroning

rust/src/wrapper/format.rs

@@ -192,6 +192,15 @@ impl Format {
         self.inner.lock().unwrap()
     }
 
+    /// Clone a Format object.
+    #[wasm_bindgen(js_name = "clone")]
+    pub fn deep_clone(&self) -> Format {
+        let inner = self.inner.lock().unwrap();
+        Format {
+            inner: Arc::new(Mutex::new(inner.clone())),
+        }
+    }
+
     /// Set the Format alignment properties.
     ///
     /// This method is used to set the horizontal and vertical data alignment

test/expected/format_clone.xlsx

@@ -204,3 +204,25 @@ describe("xlsx-wasm test", () => {
     expect(actual).matchXlsx(expected);
   });
 });
+
+describe("xlsx-wasm test", () => {
+  test("clone format object", async () => {
+    // Arrange
+    const workbook = new Workbook();
+
+    // Act
+    const worksheet = workbook.addWorksheet();
+    const baseFormat = new Format().setBold();
+    const format1 = baseFormat.clone().setItalic();
+    const format2 = baseFormat.clone().setFontColor(Color.red());
+
+    worksheet.writeStringWithFormat(0, 0, "bold", baseFormat);
+    worksheet.writeStringWithFormat(0, 1, "bold italic", format1);
+    worksheet.writeStringWithFormat(0, 2, "bold red", format2);
+
+    // Assert
+    const actual = await readXlsx(workbook.saveToBufferSync());
+    const expected = await readXlsxFile("./expected/format_clone.xlsx");
+    expect(actual).matchXlsx(expected);
+  });
+});