fix several issues under Windows

README.md

@@ -95,6 +95,7 @@ Example: Create a new sheet named 'sheet1' with 5 columns and 8 rows
 var sheet1 = workbook.createSheet('sheet1', 5, 8);
 ```
 
+### Workbook.saveSync()
 ### Workbook.save(callback)
 
 Save current workbook.

src/msexcel-builder.coffee

@@ -5,6 +5,7 @@
 ###
 JSZip = require 'jszip'
 xml = require 'xmlbuilder'
+path = require 'path'
 
 tool =
   i2a : (i) ->
@@ -339,14 +340,19 @@ class Workbook
     sheet = new Sheet(@,name,cols,rows)
     @sheets.push sheet
     return sheet
-
+  saveSync: () =>
+    @_save(null, true)
   save: (cb) =>
-    target = @fpath + '/' + @fname
+    @_save(cb, false)
+  _save: (cb, sync) =>
+    fs = require 'fs'
+    write = if sync then fs.writeFileSync else fs.writeFile 
+    target = @fpath + path.sep + @fname
     @generate (err, zip) ->
       buffer = zip.generate(type: 'nodebuffer')
       # dependence on file system isolated to this function
-      require('fs').writeFile target, buffer, cb
-
+      if sync then write target, buffer else write target, buffer, cb
+        
  # takes a callback function(err, zip) and returns a JSZip object on success
   generate: (cb) =>
 

test/example.js

@@ -1,6 +1,8 @@
 var fs = require('fs');
 var assert = require('assert');
 var JSZip = require('jszip');
+const os = require('os')
+const path = require('path')
 
 var excelbuilder = require('..');
 
@@ -38,18 +40,18 @@ describe('It generates a simple workbook', function() {
       if (err) throw err;
       else {
         var buffer = zip.generate({type: "nodebuffer"});
-        var OUTFILE = '/tmp/example.xlsx';
+        const OUTFILE = [ os.tmpdir(), 'example.xlsx' ].join(path.sep)
         fs.writeFile(OUTFILE, buffer, function (err) {
           console.log('Test file written to ' + OUTFILE);
-          compareWorkbooks('./test/files/example.xlsx', OUTFILE)
+          compareWorkbooks([ 'test', 'files', 'example.xlsx' ].join(path.sep), OUTFILE)
           done(err);
         });
       }
     });
   })
 
   it ('Supports the prior constructor syntax', function(done) {
-    var PATH = '/tmp';
+    var PATH = os.tmpdir();
     var FILENAME = 'example2.xlsx';
     var workbook = excelbuilder.createWorkbook(PATH, FILENAME);
     var sheet1 = workbook.createSheet('sheet1', 10, 12);
@@ -61,7 +63,7 @@ describe('It generates a simple workbook', function() {
     workbook.save(function (err) {
       if (err) throw err;
       else {
-        var OUTFILE = PATH + "/" + FILENAME;
+        const OUTFILE = [ PATH, FILENAME ].join(path.sep)
         console.log('Test file written to ' + OUTFILE);
         done()
       }