encoding/csv: add field ForceQuotes to Writer

[stemar94]

With a boolean field ForceQuotes in the csv.Writer one could force quotation of fields.

[gopherbot]

CL https://golang.org/cl/15013 mentions this issue.

[bradfitz]

Why?

[stemar94]

I had some compability problems, when forced to escape fields not needed to be escaped by current implementation.

Each field may or may not be enclosed in double quotes

• [RFC 4180]

Even if there is no actual specification I guess the RFC is status quo.

And if you would wrap something around the writer as

func WriteWrapper(w *csv.Writer, record []string) error {
    for i, field := range record {
         record[i] = `"` + field + `"`
    }
    return w.Write(record)
}

you would end up with """field1""","""field2"""

[rsc]

This package can't be all things to all people.

Unless the compatibility problems you alluded to are widespread, I'd prefer not to add more complexity to this package. I believe this package as it stands today matches the CSV produced by Microsoft Excel and Google Drive. That should be good enough.

If you really just want to print fully-quoted CSV, you don't even need this package:

func printCSV(w io.Writer, data [][]string) {
    for _, row := range data {
        sep := ""
        for _, cell := range row {
            fmt.Printf(`%s"%s"`, sep, strings.Replace(cell, `"`, `""`, -1))
            sep = ","
        }
        fmt.Printf("\n")
    }
}

[gopherbot]

CL https://golang.org/cl/23401 mentions this issue.

[u007]

what about
\n and \r\n
?