Resolve #582, support to set date field subtotal and names for pivot table

- typo fixed and update do.dev badge in the README.

4 files changed, 77 insertions, 10 deletions

diff --git a/README.md b/README.md
index c81efd1..fa1dda9 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
     <a href="https://travis-ci.org/360EntSecGroup-Skylar/excelize"><img src="https://travis-ci.org/360EntSecGroup-Skylar/excelize.svg?branch=master" alt="Build Status"></a>
     <a href="https://codecov.io/gh/360EntSecGroup-Skylar/excelize"><img src="https://codecov.io/gh/360EntSecGroup-Skylar/excelize/branch/master/graph/badge.svg" alt="Code Coverage"></a>
     <a href="https://goreportcard.com/report/github.com/360EntSecGroup-Skylar/excelize"><img src="https://goreportcard.com/badge/github.com/360EntSecGroup-Skylar/excelize" alt="Go Report Card"></a>
-    <a href="https://godoc.org/github.com/360EntSecGroup-Skylar/excelize"><img src="https://godoc.org/github.com/360EntSecGroup-Skylar/excelize?status.svg" alt="GoDoc"></a>
+    <a href="https://pkg.go.dev/github.com/360EntSecGroup-Skylar/excelize/v2?tab=doc"><img src="https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white" alt="go.dev"></a>
     <a href="https://opensource.org/licenses/BSD-3-Clause"><img src="https://img.shields.io/badge/license-bsd-orange.svg" alt="Licenses"></a>
     <a href="https://www.paypal.me/xuri"><img src="https://img.shields.io/badge/Donate-PayPal-green.svg" alt="Donate"></a>
 </p>
diff --git a/README_zh.md b/README_zh.md
index f75eec5..44ab9b5 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -4,7 +4,7 @@
     <a href="https://travis-ci.org/360EntSecGroup-Skylar/excelize"><img src="https://travis-ci.org/360EntSecGroup-Skylar/excelize.svg?branch=master" alt="Build Status"></a>
     <a href="https://codecov.io/gh/360EntSecGroup-Skylar/excelize"><img src="https://codecov.io/gh/360EntSecGroup-Skylar/excelize/branch/master/graph/badge.svg" alt="Code Coverage"></a>
     <a href="https://goreportcard.com/report/github.com/360EntSecGroup-Skylar/excelize"><img src="https://goreportcard.com/badge/github.com/360EntSecGroup-Skylar/excelize" alt="Go Report Card"></a>
-    <a href="https://godoc.org/github.com/360EntSecGroup-Skylar/excelize"><img src="https://godoc.org/github.com/360EntSecGroup-Skylar/excelize?status.svg" alt="GoDoc"></a>
+    <a href="https://pkg.go.dev/github.com/360EntSecGroup-Skylar/excelize/v2?tab=doc"><img src="https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white" alt="go.dev"></a>
     <a href="https://opensource.org/licenses/BSD-3-Clause"><img src="https://img.shields.io/badge/license-bsd-orange.svg" alt="Licenses"></a>
     <a href="https://www.paypal.me/xuri"><img src="https://img.shields.io/badge/Donate-PayPal-green.svg" alt="Donate"></a>
 </p>
diff --git a/pivotTable.go b/pivotTable.go
index ee0d94e..696dfe7 100644
--- a/pivotTable.go
+++ b/pivotTable.go
@@ -20,6 +20,8 @@ import (
 // PivotTableOption directly maps the format settings of the pivot table.
 type PivotTableOption struct {
 	DataRange       string
+	DataSubtotal    string
+	DataFieldName   string
 	PivotTableRange string
 	Rows            []string
 	Columns         []string
@@ -28,9 +30,29 @@ type PivotTableOption struct {
 }
 
 // AddPivotTable provides the method to add pivot table by given pivot table
-// options. For example, create a pivot table on the Sheet1!$G$2:$M$34 area
-// with the region Sheet1!$A$1:$E$31 as the data source, summarize by sum for
-// sales:
+// options.
+//
+// DataSubtotal specifies the aggregation function that applies to this data
+// field. The default value is sum. The possible values for this attribute
+// are:
+//
+//     Average
+//     Count
+//     CountNums
+//     Max
+//     Min
+//     Product
+//     StdDev
+//     StdDevp
+//     Sum
+//     Var
+//     Varp
+//
+// DataFieldName specifies the name of the data field. Maximum 255 characters
+// are allowed in data field name, excess characters will be truncated.
+//
+// For example, create a pivot table on the Sheet1!$G$2:$M$34 area with the
+// region Sheet1!$A$1:$E$31 as the data source, summarize by sum for sales:
 //
 //    package main
 //
@@ -62,6 +84,8 @@ type PivotTableOption struct {
 //            Rows:            []string{"Month", "Year"},
 //            Columns:         []string{"Type"},
 //            Data:            []string{"Sales"},
+//            DataSubtotal:    "Sum",
+//            DataFieldName:   "Summarize as Sum",
 //        }); err != nil {
 //            fmt.Println(err)
 //        }
@@ -278,9 +302,9 @@ func (f *File) addPivotTable(cacheID, pivotTableID int, pivotTableXML string, op
 	if err != nil {
 		return err
 	}
-	for _, filedIdx := range rowFieldsIndex {
+	for _, fieldIdx := range rowFieldsIndex {
 		pt.RowFields.Field = append(pt.RowFields.Field, &xlsxField{
-			X: filedIdx,
+			X: fieldIdx,
 		})
 	}
 
@@ -297,9 +321,15 @@ func (f *File) addPivotTable(cacheID, pivotTableID int, pivotTableXML string, op
 	if err != nil {
 		return err
 	}
+	dataFieldName := opt.DataFieldName
+	if len(dataFieldName) > 255 {
+		dataFieldName = dataFieldName[0:255]
+	}
 	for _, dataField := range dataFieldsIndex {
 		pt.DataFields.DataField = append(pt.DataFields.DataField, &xlsxDataField{
-			Fld: dataField,
+			Name:     dataFieldName,
+			Fld:      dataField,
+			Subtotal: f.getFieldsSubtotal(opt),
 		})
 	}
 
@@ -336,9 +366,9 @@ func (f *File) addPivotColFields(pt *xlsxPivotTableDefinition, opt *PivotTableOp
 	if err != nil {
 		return err
 	}
-	for _, filedIdx := range colFieldsIndex {
+	for _, fieldIdx := range colFieldsIndex {
 		pt.ColFields.Field = append(pt.ColFields.Field, &xlsxField{
-			X: filedIdx,
+			X: fieldIdx,
 		})
 	}
 
@@ -430,6 +460,18 @@ func (f *File) getPivotFieldsIndex(fields []string, opt *PivotTableOption) ([]in
 	return pivotFieldsIndex, nil
 }
 
+// getFieldsSubtotal prepare data subtotal by given fields and pivot option.
+func (f *File) getFieldsSubtotal(opt *PivotTableOption) (subtotal string) {
+	subtotal = "sum"
+	for _, enum := range []string{"average", "count", "countNums", "max", "min", "product", "stdDev", "stdDevp", "sum", "var", "varp"} {
+		if strings.ToLower(enum) == strings.ToLower(opt.DataSubtotal) {
+			subtotal = enum
+			return
+		}
+	}
+	return
+}
+
 // addWorkbookPivotCache add the association ID of the pivot cache in xl/workbook.xml.
 func (f *File) addWorkbookPivotCache(RID int) int {
 	wb := f.workbookReader()
diff --git a/pivotTable_test.go b/pivotTable_test.go
index 5d841d8..e40dbd6 100644
--- a/pivotTable_test.go
+++ b/pivotTable_test.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"math/rand"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -30,6 +31,8 @@ func TestAddPivotTable(t *testing.T) {
 		Rows:            []string{"Month", "Year"},
 		Columns:         []string{"Type"},
 		Data:            []string{"Sales"},
+		DataSubtotal:    "Sum",
+		DataFieldName:   "Summarize by Sum",
 	}))
 	// Use different order of coordinate tests
 	assert.NoError(t, f.AddPivotTable(&PivotTableOption{
@@ -38,6 +41,8 @@ func TestAddPivotTable(t *testing.T) {
 		Rows:            []string{"Month", "Year"},
 		Columns:         []string{"Type"},
 		Data:            []string{"Sales"},
+		DataSubtotal:    "Average",
+		DataFieldName:   "Summarize by Average",
 	}))
 
 	assert.NoError(t, f.AddPivotTable(&PivotTableOption{
@@ -46,6 +51,8 @@ func TestAddPivotTable(t *testing.T) {
 		Rows:            []string{"Month", "Year"},
 		Columns:         []string{"Region"},
 		Data:            []string{"Sales"},
+		DataSubtotal:    "Count",
+		DataFieldName:   "Summarize by Count",
 	}))
 	assert.NoError(t, f.AddPivotTable(&PivotTableOption{
 		DataRange:       "Sheet1!$A$1:$E$31",
@@ -53,12 +60,16 @@ func TestAddPivotTable(t *testing.T) {
 		Rows:            []string{"Month"},
 		Columns:         []string{"Region", "Year"},
 		Data:            []string{"Sales"},
+		DataSubtotal:    "CountNums",
+		DataFieldName:   "Summarize by CountNums",
 	}))
 	assert.NoError(t, f.AddPivotTable(&PivotTableOption{
 		DataRange:       "Sheet1!$A$1:$E$31",
 		PivotTableRange: "Sheet1!$AE$2:$AG$33",
 		Rows:            []string{"Month", "Year"},
 		Data:            []string{"Sales"},
+		DataSubtotal:    "Max",
+		DataFieldName:   "Summarize by Max",
 	}))
 	f.NewSheet("Sheet2")
 	assert.NoError(t, f.AddPivotTable(&PivotTableOption{
@@ -67,6 +78,8 @@ func TestAddPivotTable(t *testing.T) {
 		Rows:            []string{"Month"},
 		Columns:         []string{"Region", "Type", "Year"},
 		Data:            []string{"Sales"},
+		DataSubtotal:    "Min",
+		DataFieldName:   "Summarize by Min",
 	}))
 	assert.NoError(t, f.AddPivotTable(&PivotTableOption{
 		DataRange:       "Sheet1!$A$1:$E$31",
@@ -74,6 +87,8 @@ func TestAddPivotTable(t *testing.T) {
 		Rows:            []string{"Month", "Type"},
 		Columns:         []string{"Region", "Year"},
 		Data:            []string{"Sales"},
+		DataSubtotal:    "Product",
+		DataFieldName:   "Summarize by Product",
 	}))
 
 	// Test empty pivot table options
@@ -135,6 +150,16 @@ func TestAddPivotTable(t *testing.T) {
 		Data:            []string{"Sales"},
 	}), `parameter 'DataRange' parsing error: cannot convert cell "A0" to coordinates: invalid cell name "A0"`)
 	assert.NoError(t, f.SaveAs(filepath.Join("test", "TestAddPivotTable1.xlsx")))
+	// Test with field names that exceed the length limit and invalid subtotal
+	assert.NoError(t, f.AddPivotTable(&PivotTableOption{
+		DataRange:       "Sheet1!$A$1:$E$31",
+		PivotTableRange: "Sheet1!$G$2:$M$34",
+		Rows:            []string{"Month", "Year"},
+		Columns:         []string{"Type"},
+		Data:            []string{"Sales"},
+		DataSubtotal:    "-",
+		DataFieldName:   strings.Repeat("s", 256),
+	}))
 
 	// Test adjust range with invalid range
 	_, _, err := f.adjustRange("")