This closes #1148, resolve limitations when adding VBA project to the workbook

Added two exported functions `SetWorkbookPrOptions` and `GetWorkbookPrOptions` to support setting and getting the code name property of the workbook
Re-order fields of the workbook properties group to improve the compatibility
Go Modules dependencies upgrade
Put workbook related operating in new `workbook.go` source code
Library introduction docs block updated

1 files changed, 43 insertions, 0 deletions

diff --git a/workbook_test.go b/workbook_test.go
new file mode 100644
index 0000000..90fc3d7
--- /dev/null
+++ b/workbook_test.go
@@ -0,0 +1,43 @@
+package excelize
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func ExampleFile_SetWorkbookPrOptions() {
+	f := NewFile()
+	if err := f.SetWorkbookPrOptions(
+		CodeName("code"),
+	); err != nil {
+		fmt.Println(err)
+	}
+	// Output:
+}
+
+func ExampleFile_GetWorkbookPrOptions() {
+	f := NewFile()
+	var codeName CodeName
+	if err := f.GetWorkbookPrOptions(&codeName); err != nil {
+		fmt.Println(err)
+	}
+	fmt.Println("Defaults:")
+	fmt.Printf("- codeName: %q\n", codeName)
+	// Output:
+	// Defaults:
+	// - codeName: ""
+}
+
+func TestWorkbookPr(t *testing.T) {
+	f := NewFile()
+	wb := f.workbookReader()
+	wb.WorkbookPr = nil
+	var codeName CodeName
+	assert.NoError(t, f.GetWorkbookPrOptions(&codeName))
+	assert.Equal(t, "", string(codeName))
+	assert.NoError(t, f.SetWorkbookPrOptions(CodeName("code")))
+	assert.NoError(t, f.GetWorkbookPrOptions(&codeName))
+	assert.Equal(t, "code", string(codeName))
+}