From 2868bd3ec96db130b1116e4c576b3aab8efb868a Mon Sep 17 00:00:00 2001
From: Ri Xu <xuri.me@gmail.com>
Date: Wed, 26 Apr 2017 11:43:39 +0800
Subject: [PATCH] - New function `HideSheet()` and `UnhideSheet()` added; - go
 test updated

---
 excelize_test.go | 14 +++++++++++++
 sheet.go         | 54 +++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 63 insertions(+), 5 deletions(-)

diff --git a/excelize_test.go b/excelize_test.go
index 1b23dca9..813cef23 100644
--- a/excelize_test.go
+++ b/excelize_test.go
@@ -438,6 +438,20 @@ func TestGetPicture(t *testing.T) {
 	t.Log(file, len(raw))
 }
 
+func TestSheetVisibility(t *testing.T) {
+	xlsx, err := OpenFile("./test/Workbook_2.xlsx")
+	if err != nil {
+		t.Log(err)
+	}
+	xlsx.HideSheet("Sheet2")
+	xlsx.HideSheet("Sheet1")
+	xlsx.UnhideSheet("Sheet1")
+	err = xlsx.Save()
+	if err != nil {
+		t.Log(err)
+	}
+}
+
 func TestCopySheet(t *testing.T) {
 	xlsx, err := OpenFile("./test/Workbook_2.xlsx")
 	if err != nil {
diff --git a/sheet.go b/sheet.go
index f5713203..59e7cda7 100644
--- a/sheet.go
+++ b/sheet.go
@@ -243,11 +243,8 @@ func (f *File) GetActiveSheetIndex() int {
 // name in the formula or reference associated with the cell. So there may be
 // problem formula error or reference missing.
 func (f *File) SetSheetName(oldName, newName string) {
-	r := strings.NewReplacer(":", "", "\\", "", "/", "", "?", "", "*", "", "[", "", "]", "")
-	newName = r.Replace(newName)
-	if len(newName) > 31 {
-		newName = newName[0:31]
-	}
+	oldName = trimSheetName(oldName)
+	newName = trimSheetName(newName)
 	content := f.workbookReader()
 	for k, v := range content.Sheets.Sheet {
 		if v.Name == oldName {
@@ -438,3 +435,50 @@ func (f *File) copySheet(from, to int) {
 		f.XLSX[toRels] = f.XLSX[fromRels]
 	}
 }
+
+// HideSheet provides function to hide worksheet by given name. A workbook must
+// contain at least one visible worksheet. If the given worksheet has been
+// activated, this setting will be invalidated.
+func (f *File) HideSheet(name string) {
+	name = trimSheetName(name)
+	content := f.workbookReader()
+	count := 0
+	for _, v := range content.Sheets.Sheet {
+		if v.State != "hidden" {
+			count++
+		}
+	}
+	for k, v := range content.Sheets.Sheet {
+		sheetIndex := k + 1
+		xlsx := f.workSheetReader("sheet" + strconv.Itoa(sheetIndex))
+		tabSelected := false
+		if len(xlsx.SheetViews.SheetView) > 0 {
+			tabSelected = xlsx.SheetViews.SheetView[0].TabSelected
+		}
+		if v.Name == name && count > 1 && !tabSelected {
+			content.Sheets.Sheet[k].State = "hidden"
+		}
+	}
+}
+
+// UnhideSheet provides function to unhide worksheet by given name.
+func (f *File) UnhideSheet(name string) {
+	name = trimSheetName(name)
+	content := f.workbookReader()
+	for k, v := range content.Sheets.Sheet {
+		if v.Name == name {
+			content.Sheets.Sheet[k].State = ""
+		}
+	}
+}
+
+// trimSheetName provides function to trim invaild characters by given worksheet
+// name.
+func trimSheetName(name string) string {
+	r := strings.NewReplacer(":", "", "\\", "", "/", "", "?", "", "*", "", "[", "", "]", "")
+	name = r.Replace(name)
+	if len(name) > 31 {
+		name = name[0:31]
+	}
+	return name
+}