xlsx.go

package utils

import (
	"archive/zip"
	"errors"
	"fmt"
	"io"

	"github.com/sirupsen/logrus"
)

const xmlHeader = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n"

const templateDocpropsApp = `<Properties xmlns="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties" xmlns:vt="http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes"><TotalTime>0</TotalTime><Application>Go Excelize</Application></Properties>`

const templateContentTypes = `<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types"><Override PartName="/xl/theme/theme1.xml" ContentType="application/vnd.openxmlformats-officedocument.theme+xml"/><Override PartName="/xl/styles.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.styles+xml"/><Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/><Default Extension="xml" ContentType="application/xml"/><Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/><Override PartName="/docProps/app.xml" ContentType="application/vnd.openxmlformats-officedocument.extended-properties+xml"/><Override PartName="/xl/worksheets/sheet1.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/><Override PartName="/docProps/core.xml" ContentType="application/vnd.openxmlformats-package.core-properties+xml"/></Types>`

const templateWorkbook = `<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x15" xmlns:x15="http://schemas.microsoft.com/office/spreadsheetml/2010/11/main"><fileVersion appName="xl" lastEdited="6" lowestEdited="6" rupBuild="14420" /><workbookPr filterPrivacy="1" defaultThemeVersion="164011" /><bookViews><workbookView xWindow="0" yWindow="0" windowWidth="14805" windowHeight="8010" /></bookViews><sheets><sheet name="Sheet1" sheetId="1" r:id="rId1" /></sheets><calcPr calcId="122211" /></workbook>`

const templateStyles = `<styleSheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac x16r2" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:x16r2="http://schemas.microsoft.com/office/spreadsheetml/2015/02/main"><fonts count="1" x14ac:knownFonts="1"><font><sz val="11"/><color theme="1"/><name val="Calibri"/><family val="2"/></font></fonts><fills count="2"><fill><patternFill patternType="none"/></fill><fill><patternFill patternType="gray125"/></fill></fills><borders count="1"><border><left/><right/><top/><bottom/><diagonal/></border></borders><cellStyleXfs count="1"><xf numFmtId="0" fontId="0" fillId="0" borderId="0"/></cellStyleXfs><cellXfs count="1"><xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0"/></cellXfs><cellStyles count="1"><cellStyle name="Normal" xfId="0" builtinId="0"/></cellStyles><dxfs count="0"/><tableStyles count="0" defaultTableStyle="TableStyleMedium2" defaultPivotStyle="PivotStyleLight16"/></styleSheet>`

const templateSheet = `<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><dimension ref="A1"/><sheetViews><sheetView tabSelected="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15"/><sheetData/></worksheet>`

const templateWorkbookRels = `<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" Target="worksheets/sheet1.xml"/><Relationship Id="rId2" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles" Target="styles.xml"/><Relationship Id="rId3" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme" Target="theme/theme1.xml"/></Relationships>`

const templateDocpropsCore = `<cp:coreProperties xmlns:cp="http://schemas.openxmlformats.org/package/2006/metadata/core-properties" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dcmitype="http://purl.org/dc/dcmitype/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><dc:creator>xuri</dc:creator><dcterms:created xsi:type="dcterms:W3CDTF">2006-09-16T00:00:00Z</dcterms:created><dcterms:modified xsi:type="dcterms:W3CDTF">2006-09-16T00:00:00Z</dcterms:modified></cp:coreProperties>`

const templateRels = `<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId3" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties" Target="docProps/app.xml"/><Relationship Id="rId2" Type="http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties" Target="docProps/core.xml"/><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="xl/workbook.xml"/></Relationships>`

const templateTheme = `<a:theme xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" name="Office Theme"><a:themeElements><a:clrScheme name="Office"><a:dk1><a:sysClr val="windowText" lastClr="000000"/></a:dk1><a:lt1><a:sysClr val="window" lastClr="FFFFFF"/></a:lt1><a:dk2><a:srgbClr val="44546A"/></a:dk2><a:lt2><a:srgbClr val="E7E6E6"/></a:lt2><a:accent1><a:srgbClr val="5B9BD5"/></a:accent1><a:accent2><a:srgbClr val="ED7D31"/></a:accent2><a:accent3><a:srgbClr val="A5A5A5"/></a:accent3><a:accent4><a:srgbClr val="FFC000"/></a:accent4><a:accent5><a:srgbClr val="4472C4"/></a:accent5><a:accent6><a:srgbClr val="70AD47"/></a:accent6><a:hlink><a:srgbClr val="0563C1"/></a:hlink><a:folHlink><a:srgbClr val="954F72"/></a:folHlink></a:clrScheme><a:fontScheme name="Office"><a:majorFont><a:latin typeface="Calibri Light" panose="020F0302020204030204"/><a:ea typeface=""/><a:cs typeface=""/><a:font script="Jpan" typeface="游ゴシック Light"/><a:font script="Hang" typeface="맑은 고딕"/><a:font script="Hans" typeface="等线 Light"/><a:font script="Hant" typeface="新細明體"/><a:font script="Arab" typeface="Times New Roman"/><a:font script="Hebr" typeface="Times New Roman"/><a:font script="Thai" typeface="Tahoma"/><a:font script="Ethi" typeface="Nyala"/><a:font script="Beng" typeface="Vrinda"/><a:font script="Gujr" typeface="Shruti"/><a:font script="Khmr" typeface="MoolBoran"/><a:font script="Knda" typeface="Tunga"/><a:font script="Guru" typeface="Raavi"/><a:font script="Cans" typeface="Euphemia"/><a:font script="Cher" typeface="Plantagenet Cherokee"/><a:font script="Yiii" typeface="Microsoft Yi Baiti"/><a:font script="Tibt" typeface="Microsoft Himalaya"/><a:font script="Thaa" typeface="MV Boli"/><a:font script="Deva" typeface="Mangal"/><a:font script="Telu" typeface="Gautami"/><a:font script="Taml" typeface="Latha"/><a:font script="Syrc" typeface="Estrangelo Edessa"/><a:font script="Orya" typeface="Kalinga"/><a:font script="Mlym" typeface="Kartika"/><a:font script="Laoo" typeface="DokChampa"/><a:font script="Sinh" typeface="Iskoola Pota"/><a:font script="Mong" typeface="Mongolian Baiti"/><a:font script="Viet" typeface="Times New Roman"/><a:font script="Uigh" typeface="Microsoft Uighur"/><a:font script="Geor" typeface="Sylfaen"/></a:majorFont><a:minorFont><a:latin typeface="Calibri" panose="020F0502020204030204"/><a:ea typeface=""/><a:cs typeface=""/><a:font script="Jpan" typeface="游ゴシック"/><a:font script="Hang" typeface="맑은 고딕"/><a:font script="Hans" typeface="等线"/><a:font script="Hant" typeface="新細明體"/><a:font script="Arab" typeface="Arial"/><a:font script="Hebr" typeface="Arial"/><a:font script="Thai" typeface="Tahoma"/><a:font script="Ethi" typeface="Nyala"/><a:font script="Beng" typeface="Vrinda"/><a:font script="Gujr" typeface="Shruti"/><a:font script="Khmr" typeface="DaunPenh"/><a:font script="Knda" typeface="Tunga"/><a:font script="Guru" typeface="Raavi"/><a:font script="Cans" typeface="Euphemia"/><a:font script="Cher" typeface="Plantagenet Cherokee"/><a:font script="Yiii" typeface="Microsoft Yi Baiti"/><a:font script="Tibt" typeface="Microsoft Himalaya"/><a:font script="Thaa" typeface="MV Boli"/><a:font script="Deva" typeface="Mangal"/><a:font script="Telu" typeface="Gautami"/><a:font script="Taml" typeface="Latha"/><a:font script="Syrc" typeface="Estrangelo Edessa"/><a:font script="Orya" typeface="Kalinga"/><a:font script="Mlym" typeface="Kartika"/><a:font script="Laoo" typeface="DokChampa"/><a:font script="Sinh" typeface="Iskoola Pota"/><a:font script="Mong" typeface="Mongolian Baiti"/><a:font script="Viet" typeface="Arial"/><a:font script="Uigh" typeface="Microsoft Uighur"/><a:font script="Geor" typeface="Sylfaen"/></a:minorFont></a:fontScheme><a:fmtScheme name="Office"><a:fillStyleLst><a:solidFill><a:schemeClr val="phClr"/></a:solidFill><a:gradFill rotWithShape="1"><a:gsLst><a:gs pos="0"><a:schemeClr val="phClr"><a:lumMod val="110000"/><a:satMod val="105000"/><a:tint val="67000"/></a:schemeClr></a:gs><a:gs pos="50000"><a:schemeClr val="phClr"><a:lumMod val="105000"/><a:satMod val="103000"/><a:tint val="73000"/></a:schemeClr></a:gs><a:gs pos="100000"><a:schemeClr val="phClr"><a:lumMod val="105000"/><a:satMod val="109000"/><a:tint val="81000"/></a:schemeClr></a:gs></a:gsLst><a:lin ang="5400000" scaled="0"/></a:gradFill><a:gradFill rotWithShape="1"><a:gsLst><a:gs pos="0"><a:schemeClr val="phClr"><a:satMod val="103000"/><a:lumMod val="102000"/><a:tint val="94000"/></a:schemeClr></a:gs><a:gs pos="50000"><a:schemeClr val="phClr"><a:satMod val="110000"/><a:lumMod val="100000"/><a:shade val="100000"/></a:schemeClr></a:gs><a:gs pos="100000"><a:schemeClr val="phClr"><a:lumMod val="99000"/><a:satMod val="120000"/><a:shade val="78000"/></a:schemeClr></a:gs></a:gsLst><a:lin ang="5400000" scaled="0"/></a:gradFill></a:fillStyleLst><a:lnStyleLst><a:ln w="6350" cap="flat" cmpd="sng" algn="ctr"><a:solidFill><a:schemeClr val="phClr"/></a:solidFill><a:prstDash val="solid"/><a:miter lim="800000"/></a:ln><a:ln w="12700" cap="flat" cmpd="sng" algn="ctr"><a:solidFill><a:schemeClr val="phClr"/></a:solidFill><a:prstDash val="solid"/><a:miter lim="800000"/></a:ln><a:ln w="19050" cap="flat" cmpd="sng" algn="ctr"><a:solidFill><a:schemeClr val="phClr"/></a:solidFill><a:prstDash val="solid"/><a:miter lim="800000"/></a:ln></a:lnStyleLst><a:effectStyleLst><a:effectStyle><a:effectLst/></a:effectStyle><a:effectStyle><a:effectLst/></a:effectStyle><a:effectStyle><a:effectLst><a:outerShdw blurRad="57150" dist="19050" dir="5400000" algn="ctr" rotWithShape="0"><a:srgbClr val="000000"><a:alpha val="63000"/></a:srgbClr></a:outerShdw></a:effectLst></a:effectStyle></a:effectStyleLst><a:bgFillStyleLst><a:solidFill><a:schemeClr val="phClr"/></a:solidFill><a:solidFill><a:schemeClr val="phClr"><a:tint val="95000"/><a:satMod val="170000"/></a:schemeClr></a:solidFill><a:gradFill rotWithShape="1"><a:gsLst><a:gs pos="0"><a:schemeClr val="phClr"><a:tint val="93000"/><a:satMod val="150000"/><a:shade val="98000"/><a:lumMod val="102000"/></a:schemeClr></a:gs><a:gs pos="50000"><a:schemeClr val="phClr"><a:tint val="98000"/><a:satMod val="130000"/><a:shade val="90000"/><a:lumMod val="103000"/></a:schemeClr></a:gs><a:gs pos="100000"><a:schemeClr val="phClr"><a:shade val="63000"/><a:satMod val="120000"/></a:schemeClr></a:gs></a:gsLst><a:lin ang="5400000" scaled="0"/></a:gradFill></a:bgFillStyleLst></a:fmtScheme></a:themeElements><a:objectDefaults/><a:extraClrSchemeLst/></a:theme>`

const templateNamespaceIDMap = ` xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:ap="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties" xmlns:op="http://schemas.openxmlformats.org/officeDocument/2006/custom-properties" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart" xmlns:cdr="http://schemas.openxmlformats.org/drawingml/2006/chartDrawing" xmlns:comp="http://schemas.openxmlformats.org/drawingml/2006/compatibility" xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram" xmlns:lc="http://schemas.openxmlformats.org/drawingml/2006/lockedCanvas" xmlns:pic="http://schemas.openxmlformats.org/drawingml/2006/picture" xmlns:xdr="http://schemas.openxmlformats.org/drawingml/2006/spreadsheetDrawing" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:ds="http://schemas.openxmlformats.org/officeDocument/2006/customXml" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math" xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:sl="http://schemas.openxmlformats.org/schemaLibrary/2006/main" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:xne="http://schemas.microsoft.com/office/excel/2006/main" xmlns:mso="http://schemas.microsoft.com/office/2006/01/customui" xmlns:ax="http://schemas.microsoft.com/office/2006/activeX" xmlns:cppr="http://schemas.microsoft.com/office/2006/coverPageProps" xmlns:cdip="http://schemas.microsoft.com/office/2006/customDocumentInformationPanel" xmlns:ct="http://schemas.microsoft.com/office/2006/metadata/contentType" xmlns:ntns="http://schemas.microsoft.com/office/2006/metadata/customXsn" xmlns:lp="http://schemas.microsoft.com/office/2006/metadata/longProperties" xmlns:ma="http://schemas.microsoft.com/office/2006/metadata/properties/metaAttributes" xmlns:msink="http://schemas.microsoft.com/ink/2010/main" xmlns:c14="http://schemas.microsoft.com/office/drawing/2007/8/2/chart" xmlns:cdr14="http://schemas.microsoft.com/office/drawing/2010/chartDrawing" xmlns:a14="http://schemas.microsoft.com/office/drawing/2010/main" xmlns:pic14="http://schemas.microsoft.com/office/drawing/2010/picture" xmlns:x14="http://schemas.microsoft.com/office/spreadsheetml/2009/9/main" xmlns:xdr14="http://schemas.microsoft.com/office/excel/2010/spreadsheetDrawing" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:dsp="http://schemas.microsoft.com/office/drawing/2008/diagram" xmlns:mso14="http://schemas.microsoft.com/office/2009/07/customui" xmlns:dgm14="http://schemas.microsoft.com/office/drawing/2010/diagram" xmlns:x15="http://schemas.microsoft.com/office/spreadsheetml/2010/11/main" xmlns:x12ac="http://schemas.microsoft.com/office/spreadsheetml/2011/1/ac" xmlns:x15ac="http://schemas.microsoft.com/office/spreadsheetml/2010/11/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr4="http://schemas.microsoft.com/office/spreadsheetml/2016/revision4" xmlns:xr5="http://schemas.microsoft.com/office/spreadsheetml/2016/revision5" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xmlns:xr7="http://schemas.microsoft.com/office/spreadsheetml/2016/revision7" xmlns:xr8="http://schemas.microsoft.com/office/spreadsheetml/2016/revision8" xmlns:xr9="http://schemas.microsoft.com/office/spreadsheetml/2016/revision9" xmlns:xr10="http://schemas.microsoft.com/office/spreadsheetml/2016/revision10" xmlns:xr11="http://schemas.microsoft.com/office/spreadsheetml/2016/revision11" xmlns:xr12="http://schemas.microsoft.com/office/spreadsheetml/2016/revision12" xmlns:xr13="http://schemas.microsoft.com/office/spreadsheetml/2016/revision13" xmlns:xr14="http://schemas.microsoft.com/office/spreadsheetml/2016/revision14" xmlns:xr15="http://schemas.microsoft.com/office/spreadsheetml/2016/revision15" xmlns:x16="http://schemas.microsoft.com/office/spreadsheetml/2014/11/main" xmlns:x16r2="http://schemas.microsoft.com/office/spreadsheetml/2015/02/main" mc:Ignorable="c14 cdr14 a14 pic14 x14 xdr14 x14ac dsp mso14 dgm14 x15 x12ac x15ac xr xr2 xr3 xr4 xr5 xr6 xr7 xr8 xr9 xr10 xr11 xr12 xr13 xr14 xr15 x15 x16 x16r2 mo mx mv o v" xmlns:mo="http://schemas.microsoft.com/office/mac/office/2008/main" xmlns:mx="http://schemas.microsoft.com/office/mac/excel/2008/main" xmlns:mv="urn:schemas-microsoft-com:mac:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:v="urn:schemas-microsoft-com:vml" xr:uid="{00000000-0001-0000-0000-000000000000}">`

var worksheetHeader = xmlHeader + `<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"
	xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"
	xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac xr xr2 xr3"
	xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"
	xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision"
	xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2"
	xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xr:uid="{A45FA7EE-319C-4F2A-BADD-CBFF345C308D}">
`

// ErrorXlsxMismatchRow used for mismatch row in xlsx
var ErrorXlsxMismatchRow = errors.New("Xlsx row size not match with column size")

// StringWriter wrapped a io.Writer
type StringWriter struct {
	writer io.Writer
}

// XlsxFile represent a xlsx file
type XlsxFile struct {
	Logger      *logrus.Logger
	Name        string
	ZipWriter   *zip.Writer
	Columns     []string
	SheetWriter StringWriter
	RowNumber   int
}

func (s *StringWriter) Write(str string) int {
	n, err := s.writer.Write([]byte(str))
	if err != nil {
		panic(err)
	}
	return n
}

var files map[string][]byte

func init() {
	files = make(map[string][]byte)
	files["_rels/.rels"] = []byte(xmlHeader + templateRels)
	files["docProps/app.xml"] = []byte(xmlHeader + templateDocpropsApp)
	files["docProps/core.xml"] = []byte(xmlHeader + templateDocpropsCore)
	files["xl/_rels/workbook.xml.rels"] = []byte(xmlHeader + templateWorkbookRels)
	files["xl/theme/theme1.xml"] = []byte(xmlHeader + templateTheme)
	files["xl/styles.xml"] = []byte(xmlHeader + templateStyles)
	files["[Content_Types].xml"] = []byte(xmlHeader + templateContentTypes)

	files["xl/workbook.xml"] = []byte(xmlHeader + templateWorkbook)
	//files["xl/worksheets/sheet1.xml"] = []byte(xmlHeader + templateSheet)
}

func columnName(n int) string {
	dividend := n
	name := ""
	modulo := 0
	for dividend > 0 {
		modulo = (dividend - 1) % 26
		name = string(65+modulo) + name
		dividend = (dividend - modulo) / 26
	}
	return name
}

// NewXlsxFile create a xlsx file
func NewXlsxFile(name string, w io.Writer, cols []string, logger *logrus.Logger) (*XlsxFile, error) {
	writer := zip.NewWriter(w)

	// create template files
	for filename, content := range files {
		fh := &zip.FileHeader{
			Name:   filename,
			Method: zip.Store,
		}
		w, err := writer.CreateHeader(fh)
		if err != nil {
			logger.WithError(err).Error("Failed to create zip header")
			return nil, err
		}
		w.Write(content)
	}

	return &XlsxFile{
		Logger:    logger,
		Name:      name,
		ZipWriter: writer,
		Columns:   cols,
		RowNumber: 1,
	}, nil
}

// WriteSheetHead write sheet head
func (f *XlsxFile) WriteSheetHead() (err error) {
	defer func() {
		e := recover()
		if e != nil {
			err = e.(error)
			f.Logger.WithError(err).Error("Write sheet header error")
		}
	}()

	// create sheet1.xml
	fh := &zip.FileHeader{
		Name:   "xl/worksheets/sheet1.xml",
		Method: zip.Store,
	}
	w, err := f.ZipWriter.CreateHeader(fh)
	if err != nil {
		f.Logger.WithError(err).Error("Write sheet header error")
		return err
	}
	f.SheetWriter = StringWriter{w}

	f.SheetWriter.Write(worksheetHeader)

	// cols
	f.SheetWriter.Write("<cols>")
	for n := 1; n <= len(f.Columns); n++ {
		f.SheetWriter.Write(fmt.Sprintf(`<col min="%d" max="%d" width="20" />`, n, n))
	}
	f.SheetWriter.Write("</cols>")

	// sheetData
	f.SheetWriter.Write("<sheetData>")

	// first row, title
	f.WriteRow(f.Columns)

	return err
}

// WriteSheetTail write sheet tail
func (f *XlsxFile) WriteSheetTail() {
	f.SheetWriter.Write("</sheetData>")
	f.SheetWriter.Write("</worksheet>")
}

// WriteRow will write one row into xlsx
func (f *XlsxFile) WriteRow(row []string) error {
	if len(row) != len(f.Columns) {
		f.Logger.Error("row and column definition not match")
		return ErrorXlsxMismatchRow
	}

	rn := f.RowNumber
	f.RowNumber++

	f.SheetWriter.Write(fmt.Sprintf(`<row r="%d" spans="1:3" x14ac:dyDescent="0.25">`+"\n", rn))

	for n, str := range row {
		f.SheetWriter.Write(fmt.Sprintf(`<c r="%s%d" t="inlineStr"><is><t>%s</t></is></c>`+"\n", columnName(n+1), rn, str))
	}
	f.SheetWriter.Write("</row>")
	return nil
}

// Close will close the xlsx file
func (f *XlsxFile) Close() error {
	return f.ZipWriter.Close()
}

xlsx_test.go

package utils

import (
	"os"
	"strconv"
	"testing"
)

func TestCreateEmptyXlsx(*testing.T) {
	logger := logging.InitLogger()

	name := "test.xlsx"
	f, _ := os.Create(name)
	x, _ := NewXlsxFile("test.xlsx", f, []string{"agent id", "timestamp", "log"}, logger)
	x.WriteSheetHead()

	for i := 2; i <= 100; i++ {
		x.WriteRow([]string{strconv.Itoa(i) + " 1", strconv.Itoa(i) + " 2", strconv.Itoa(i) + " 3"})
	}

	x.WriteSheetTail()
	x.Close()
}