XLSX write page margins

changes distilled from Siguza/js-xlsx
see protobi#19 for discussion

bits/67_wsxml.js

@@ -143,6 +143,10 @@ function parse_ws_xml_margins(margin) {
 	});
 	return o;
 }
+function write_ws_xml_margins(margin) {
+	default_margins(margin);
+	return writextag('pageMargins', null, margin);
+}
 
 function parse_ws_xml_cols(columns, cols) {
 	var seencol = false;
@@ -452,7 +456,7 @@ function write_ws_xml(idx/*:number*/, opts, wb/*:Workbook*/, rels)/*:string*/ {
 	delete ws['!links'];
 
 	/* printOptions */
-	/* pageMargins */
+	if (ws['!margins'] != null) o[o.length] =  write_ws_xml_margins(ws['!margins'])
 	/* pageSetup */
 
 	var hfidx = o.length;

test.js

@@ -658,6 +658,14 @@ function hlink(wb) {
 	assert.equal(get_cell(ws, "A7").l.Tooltip, "foo bar baz");
 }
 
+function check_margin(margins, exp) {
+	assert.equal(margins.left, exp[0]);
+	assert.equal(margins.right, exp[1]);
+	assert.equal(margins.top, exp[2]);
+	assert.equal(margins.bottom, exp[3]);
+	assert.equal(margins.header, exp[4]);
+	assert.equal(margins.footer, exp[5]);
+}
 
 describe('parse features', function() {
 	describe('sheet visibility', function() {
@@ -977,14 +985,6 @@ describe('parse features', function() {
 	});
 
 	describe('page margins', function() {
-		function check_margin(margins, exp) {
-			assert.equal(margins.left, exp[0]);
-			assert.equal(margins.right, exp[1]);
-			assert.equal(margins.top, exp[2]);
-			assert.equal(margins.bottom, exp[3]);
-			assert.equal(margins.header, exp[4]);
-			assert.equal(margins.footer, exp[5]);
-		}
 		var wb1, wb2, wb3, wb4, wb5, wbs;
 		var bef = (function() {
 			wb1 = X.readFile(paths.pmxls);
@@ -1251,6 +1251,21 @@ describe('roundtrip features', function() {
 		});
 	});
 
+	describe('should preserve page margins', function() {[
+			//['xlml', paths.pmxml],
+			['xlsx', paths.pmxlsx],
+			['xlsb', paths.pmxlsb]
+		].forEach(function(w) { it(w[0], function() {
+			var wb1 = X.readFile(w[1]);
+			var wb2 = X.read(X.write(wb1, {bookType:w[0], type:"binary"}), {type:"binary"});
+			check_margin(wb2.Sheets["Normal"]["!margins"], [0.7, 0.7, 0.75, 0.75, 0.3, 0.3]);
+			check_margin(wb2.Sheets["Wide"]["!margins"], [1, 1, 1, 1, 0.5, 0.5]);
+			check_margin(wb2.Sheets["Wide"]["!margins"], [1, 1, 1, 1, 0.5, 0.5]);
+			check_margin(wb2.Sheets["Narrow"]["!margins"], [0.25, 0.25, 0.75, 0.75, 0.3, 0.3]);
+			check_margin(wb2.Sheets["Custom 1 Inch Centered"]["!margins"], [1, 1, 1, 1, 0.3, 0.3]);
+			check_margin(wb2.Sheets["1 Inch HF"]["!margins"], [0.7, 0.7, 0.75, 0.75, 1, 1]);
+	}); }); });
+
 	describe('should preserve sheet visibility', function() { [
 			['xlml', paths.svxml],
 			['xlsx', paths.svxlsx],

xlsx.flow.js

@@ -10100,6 +10100,10 @@ function parse_ws_xml_margins(margin) {
 	});
 	return o;
 }
+function write_ws_xml_margins(margin) {
+	default_margins(margin);
+	return writextag('pageMargins', null, margin);
+}
 
 function parse_ws_xml_cols(columns, cols) {
 	var seencol = false;
@@ -10409,7 +10413,7 @@ function write_ws_xml(idx/*:number*/, opts, wb/*:Workbook*/, rels)/*:string*/ {
 	delete ws['!links'];
 
 	/* printOptions */
-	/* pageMargins */
+	if (ws['!margins'] != null) o[o.length] =  write_ws_xml_margins(ws['!margins'])
 	/* pageSetup */
 
 	var hfidx = o.length;

xlsx.js

@@ -10038,6 +10038,10 @@ function parse_ws_xml_margins(margin) {
 	});
 	return o;
 }
+function write_ws_xml_margins(margin) {
+	default_margins(margin);
+	return writextag('pageMargins', null, margin);
+}
 
 function parse_ws_xml_cols(columns, cols) {
 	var seencol = false;
@@ -10347,7 +10351,7 @@ function write_ws_xml(idx, opts, wb, rels) {
 	delete ws['!links'];
 
 	/* printOptions */
-	/* pageMargins */
+	if (ws['!margins'] != null) o[o.length] =  write_ws_xml_margins(ws['!margins'])
 	/* pageSetup */
 
 	var hfidx = o.length;