Fix issue 226

manually merge default font with date format. Libreoffice does not use first font if no font set

package.json

@@ -42,6 +42,7 @@
     "prepublish": "npm run build; npm run test"
   },
   "dependencies": {
+    "deepmerge": "2.1.1",
     "image-size": "0.6.3",
     "jszip": "3.1.5",
     "lodash": "4.17.10",

source/lib/cell/index.js

@@ -120,9 +120,10 @@ function dateSetter(val) {
         var c = this.cells[0];
         c.date(thisDate);
     }
-    return styleSetter.bind(this)({
+    const dtStyle = new Style(this.ws.wb, {
         numberFormat: '[$-409]' + this.ws.wb.opts.dateFormat
     });
+    return styleSetter.bind(this)(dtStyle);
 }
 
 function styleSetter(val) {

source/lib/style/style.js

@@ -1,16 +1,16 @@
 const utils = require('../utils.js');
-const _ = require('lodash');
+const deepmerge = require('deepmerge');
 
 const Alignment = require('./classes/alignment.js');
 const Border = require('./classes/border.js');
 const Fill = require('./classes/fill.js');
 const Font = require('./classes/font.js');
 const NumberFormat = require('./classes/numberFormat.js');
 
-let _getFontId = (wb, font) => {
+let _getFontId = (wb, font = {}) => {
 
     // Create the Font and lookup key
-    font = _.merge({}, wb.opts.defaultFont, font);
+    font = deepmerge(wb.opts.defaultFont, font);
     const thisFont = new Font(font);
     const lookupKey = JSON.stringify(thisFont.toObject());
 
@@ -65,7 +65,7 @@ let _getBorderId = (wb, border) => {
 let _getNumFmt = (wb, val) => {
     let fmt;
     wb.styleData.numFmts.forEach((f) => {
-        if (_.isEqual(f.formatCode, val)) {
+        if (f.formatCode === val) {
             fmt = f;
         }
     });
@@ -170,26 +170,27 @@ class Style {
          * @returns {Style} 
          */
         opts = opts ? opts : {};
+        opts = deepmerge(wb.styles[0] ? wb.styles[0] : {}, opts);
 
         if (opts.alignment !== undefined) {
             this.alignment = new Alignment(opts.alignment);
         }
 
-        if (opts.border !== undefined) {  
+        if (opts.border !== undefined) {
             this.borderId = _getBorderId(wb, opts.border); // attribute 0 based index
-            this.border = wb.styleData.borders[this.borderId];  
+            this.border = wb.styleData.borders[this.borderId];
         }
-        if (opts.fill !== undefined) {  
+        if (opts.fill !== undefined) {
             this.fillId = _getFillId(wb, opts.fill); // attribute 0 based index
             this.fill = wb.styleData.fills[this.fillId];
         }
 
-        if (opts.font !== undefined) {  
+        if (opts.font !== undefined) {
             this.fontId = _getFontId(wb, opts.font); // attribute 0 based index
             this.font = wb.styleData.fonts[this.fontId];
         }
 
-        if (opts.numberFormat !== undefined) {  
+        if (opts.numberFormat !== undefined) {
             if (typeof opts.numberFormat === 'number' && opts.numberFormat <= 164) {
                 this.numFmtId = opts.numberFormat;
             } else if (typeof opts.numberFormat === 'string') {
@@ -281,7 +282,7 @@ class Style {
             obj.quotePrefix = this.quotePrefix;
         }
 
-        return obj;   
+        return obj;
     }
 
     /**
@@ -299,7 +300,7 @@ class Style {
             } else {
                 thisEle.att(a, thisXF[a]);
             }
-        });        
+        });
     }
 
     /**

source/lib/workbook/workbook.js

@@ -1,10 +1,12 @@
 const _ = require('lodash');
+const deepmerge = require('deepmerge');
 const fs = require('fs');
 const utils = require('../utils.js');
 const Worksheet = require('../worksheet');
 const Style = require('../style');
 const Border = require('../style/classes/border.js');
 const Fill = require('../style/classes/fill.js');
+const Font = require('../style/classes/font');
 const DXFCollection = require('./dxfCollection.js');
 const MediaCollection = require('./mediaCollection.js');
 const DefinedNameCollection = require('../classes/definedNameCollection.js');
@@ -82,7 +84,7 @@ class Workbook {
             this.logger.log('opts.logger is not a valid logger');
         }
 
-        this.opts = _.merge({}, workbookDefaultOpts, opts);
+        this.opts = deepmerge(workbookDefaultOpts, opts);
 
         this.sheets = [];
         this.sharedStrings = [];
@@ -130,7 +132,6 @@ class Workbook {
         this.createStyle({
             font: this.opts.defaultFont
         });
-
     }
 
     /**