From aeb357df30c5b821aa2232762a939de1bc6237f3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A1mal=20Rasmussen?= <samal84@gmail.com>
Date: Fri, 20 Jun 2025 14:34:44 +0100
Subject: [PATCH] Add column_alignments to addSheetFromData

---
 src/nullxlsx.js | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/src/nullxlsx.js b/src/nullxlsx.js
index 2cc8f21..8376a23 100644
--- a/src/nullxlsx.js
+++ b/src/nullxlsx.js
@@ -19,7 +19,7 @@ export class NullXlsx extends NullDownloader {
 	/**
 	 * Creates a new xlsx file
 	 * @param {string} filename Name of file once generated
-	 * @param {Object} options Settings
+	 * @param {{ frozen?: boolean, filter?: boolean }} [options] Settings
 	 */
 	constructor(filename, options) {
 		super(filename, `${ baseContentType }.sheet`);
@@ -33,14 +33,16 @@ export class NullXlsx extends NullDownloader {
 	 * Create a spreadsheet from an array of arrays of data
 	 * @param {Array<Array<*>>} data Cell values
 	 * @param {string} name Name of sheet
+	 * @param {{[key: number]: 'left' | 'center' | 'right'}} [column_alignments] Column alignment settings
 	 * @return {NullXlsx} Returns itself for method chaining
 	 */
-	addSheetFromData(data, name) {
+	addSheetFromData(data, name, column_alignments) {
 		const i = this.sheets.length + 1;
 		this.sheets.push({
 			id: i,
 			name: this.escapeXml(name || 'Sheet' + i),
-			data
+			data,
+			column_alignments: column_alignments || {}
 		});
 		return this;
 	}
@@ -63,6 +65,8 @@ export class NullXlsx extends NullDownloader {
 					+ '<xf borderId="0" fillId="0" fontId="1" numFmtId="0" xfId="0" applyAlignment="1" applyFont="1"><alignment/></xf>'
 					+ '<xf borderId="0" fillId="0" fontId="0" numFmtId="164" xfId="0" applyAlignment="1" applyFont="1" applyNumberFormat="1"><alignment /></xf>'
 					+ '<xf borderId="0" fillId="0" fontId="0" numFmtId="165" xfId="0" applyAlignment="1" applyFont="1" applyNumberFormat="1"><alignment /></xf>'
+					+ '<xf borderId="0" fillId="0" fontId="0" numFmtId="0" xfId="0" applyAlignment="1" applyFont="1"><alignment horizontal="right"/></xf>'
+					+ '<xf borderId="0" fillId="0" fontId="0" numFmtId="0" xfId="0" applyAlignment="1" applyFont="1"><alignment horizontal="center"/></xf>'
 					+ '</cellXfs><cellStyles count="1"><cellStyle xfId="0" name="Normal" builtinId="0"/></cellStyles><dxfs count="0"/></styleSheet>'
 			}, {
 				name: 'xl/sharedStrings.xml',
@@ -101,14 +105,24 @@ export class NullXlsx extends NullDownloader {
 					}
 					const cells = row.map((cell, cellIndex) => {
 						const cellName = this.colName(cellIndex) + (rowIndex + 1);
+						const alignment = sheet.column_alignments[cellIndex];
+						let alignment_style = '';
+						
+						if (alignment === 'right') {
+							alignment_style = ' s="4"';
+						} else if (alignment === 'center') {
+							alignment_style = ' s="5"';
+						}
+						// left alignment uses default style (no explicit style needed)
+						
 						if (typeof cell === 'number') {
-							return `<c r="${ cellName }"${ style }><v>${ cell }</v></c>`;
+							return `<c r="${ cellName }"${ style }${ alignment_style }><v>${ cell }</v></c>`;
 						}
 						if (cell instanceof Date) {
 							const dateStyle = cell.getHours() || cell.getMinutes() || cell.getSeconds() ? 3 : 2;
 							return `<c s="${ dateStyle }"><v>${ this.dateToExcelDate(cell) }</v></c>`;
 						}
-						return `<c t="inlineStr"${ style }><is><t>${ this.escapeXml(cell.toString()) }</t></is></c>`;
+						return `<c t="inlineStr"${ style }${ alignment_style }><is><t>${ this.escapeXml(cell.toString()) }</t></is></c>`;
 					});
 					return `<row r="${ rowIndex + 1 }">${ cells.join('') }</row>`;
 				});