Fix/newlines in cells

[dbuentello]

Issue: Newlines are not preserved within a cell's content.
Cause: JSON.stringify escapes \n and you end up \\n instead.
Fix: Replace occurrences of \\n with \n in the stringifiedElement (before the row delimiter).

Includes appropriate tests

[coveralls]

Coverage remained the same at 100.0% when pulling c2b0f81 on dbuentello:fix/newlines-in-cells into dbdc877 on zemirco:master.

[dbuentello]

resolves #91

[knownasilya]

Excellent!

[grimor]

It opens correctly in OpenOffice, but in Excel it translates new line as new row. It breaks all displayed data (can't correctly figure out that newline char is within " " and shouldn't create new row). I reverted to v3.4.1 to solve that. Don't know why it was changed. You can't display multi line text within cell (as far I know)

[knownasilya]

@grimor http://superuser.com/a/73851/209612 are you sure it's not an issue with your version of Excel?

[grimor]

Ok, even if it's possible to create new lines, it doesn't get imported correctly for me (Excel 2010). It converts new lines intro new row (as CSV contains each row in new line). It doesn't parse that it's between double quotes/

[knownasilya]

@dbuentello what version of Excel do you have?

[dbuentello]

Excel 2015 for Mac, also tested on Windows with Excel 2016

[dbuentello]

@grimor can you run code below and upload csv

var json2csv = require('./lib/json2csv');
var fs = require('fs');

var data = [{
  col1: 'This doesnt have newline',
  col2: 'Line1\nLine2',
  col3: 'This doesnt have newline'
},
{
  col1: 'This doesnt have newline',
  col2: 'Line1\nLine2\n\nline 3',
  col3: 'This doesnt have newline'
}]
json2csv({ data: data }, function(err, csv) {
  if (err) {
    console.log(err);
  }
  fs.writeFile('file.csv', csv, function(err) {
    if (err) {
      throw err;
    }
    console.log('file saved');
  });
});

[leachiM2k]

Hey, I'm using Excel 2010 and have the same issue. The only solution was to downgrade to 3.4.2

@dbuentello
The result of your script is

"col1","col2","col3"
"This doesnt have newline","Line1
Line2","This doesnt have newline"
"This doesnt have newline","Line1
Line2

line 3","This doesnt have newline"

I tried to generate a multi-line CSV in Excel and I've found out, that Excel uses different characters to determine normal (row) line break and a multi-line cell line break.
Line Breaks in Cell are only determined if they are \n only and all other line breaks are \r or \r\n

[knownasilya]

Good catch! So the split needs to be more specific it seems.

[knownasilya]

I've reverted this PR in 3.5.1