Force double quotes enclosing using the 'enclose' option

index.js

@@ -10,6 +10,7 @@ var CsvWriteStream = function(opts) {
   this.headers = opts.headers || null
   this.separator = opts.separator || opts.seperator || ','
   this.newline = opts.newline || '\n'
+  this.enclose = opts.enclose || false
 
   this._objRow = null
   this._arrRow = null
@@ -22,6 +23,7 @@ util.inherits(CsvWriteStream, stream.Transform)
 CsvWriteStream.prototype._compile = function(headers) {
   var newline = this.newline
   var sep = this.separator
+  var enclose = this.enclose
   var str = 'function toRow(obj) {\n'
 
   if (!headers.length) str += '""'
@@ -35,7 +37,11 @@ CsvWriteStream.prototype._compile = function(headers) {
     var part = headers.length < 500 ? headers : headers.slice(i, i + 500)
     str += i ? 'result += "'+sep+'" + ' : 'var result = '
     part.forEach(function(prop, j) {
-      str += (j ? '+"'+sep+'"+' : '') + '(/['+sep+'\\r\\n"]/.test('+prop+') ? esc('+prop+'+"") : '+prop+')'
+      if (!enclose) {
+        str += (j ? '+"'+sep+'"+' : '') + '(/['+sep+'\\r\\n"]/.test('+prop+') ? esc('+prop+'+"") : '+prop+')'
+      } else {
+        str += (j ? '+"'+sep+'"+' : '') + 'esc('+prop+'+"")'
+      }
     })
     str += '\n'
   }

readme.md

@@ -26,12 +26,15 @@ var writer = csvWriter()
   separator: ',',
   newline: '\n',
   headers: undefined,
-  sendHeaders: true
+  sendHeaders: true,
+  enclose: false,
 }
 ```
 
 `headers` can be an array of strings to use as the header row. if you don't specify a header row the keys of the first row written to the stream will be used as the header row IF the first row is an object (see the test suite for more details). if the `sendHeaders` option is set to false, the headers will be used for ordering the data but will never be written to the stream.
 
+`enclose` is a boolean. If true, then it will force enclosing with double quotes all the fields. If false, it will use enclosing with double quotes only if it is necessary.
+
 example of auto headers:
 
 ```javascript

test.js

@@ -86,6 +86,18 @@ test('encode from object w/ auto headers', function(t) {
   writer.end()
 })
 
+test('enclose values', function(t) {
+  var writer = csv({enclose: true})
+
+  writer.pipe(concat(function(data) {
+    t.equal('"hello","foo","baz"\n"world","bar","ta""co"\n', data.toString())
+    t.end()
+  }))
+
+  writer.write({hello: "world", foo: "bar", baz: 'ta"co'})
+  writer.end()
+})
+
 test('no headers specified', function(t) {
   var writer = csv()