change delimiter in output format

[Viv1k]

Many people may have requirement of customized output delimiter (like output should be comma or some-delimiter separated)
It make parsing of logs easier and they can be simply analyzed by using basic linux command (without using any third party software to write in a specific format and then using a log parser or analyzer library to see those logs).

Can we have a feature in go-logging library for customized output by changing output delimiter.

Is it currently possible?

Yes, but not through standard fmt.Fprintf function
In function (r *Record) Message() string https://github.com/op/go-logging/blob/master/logger.go#L69, go-logging uses fmt.Fprintf (which utilizes custom input format) and fmt.Fprintln (where delimiter is hard-coded to ' ' inside golang source code
https://github.com/golang/go/blob/4555ed2e5ef029cafb8040710537f0ebffd41ad6/src/fmt/print.go#L1141)

So, fmt package won't help us here.

How is possible?

By making a customized function and initial configuration

so we can have an initializer function like

(l *Logger) SetDelimiter(delimiter string) {
   // and change here Record structure to contain delimiter field storing provided delimiter value
}

and while writing to file
we can use the following function as suggested here

var formatMap = map[int]string{
    0: "",
    1: "%v",
}

func doPrintWithDelim(v ...interface{}) {
    l := len(v)
    if s, isOk := formatMap[l]; !isOk {
        for i := 0; i < len(v); i++ {
            s += "%v"
        }
        formatMap[l] = s
    }
    s := formatMap[l] + "\n"
    fmt.Printf(s, v...)
}

This would be very helpful if implemented in the library
If you want I can make pull request and make the changes for you.

Please let me know.