Playing with logfmt go k=v parser library

main.go

package main

import (
	"fmt"
	"strconv"

	"github.com/davecgh/go-spew/spew"
	"github.com/kr/logfmt"
)

// base test case
const t0 = `foo=bar`
// string, int, float, bool
const t1 = `foo=bar baz=3 fl=3.1415926535 bl=true`
// value has multiple words, unquoted
const t2 = `foo=bar ben=one two baz=3`
// value has a quoted string with spaces and an equals sign
const t3 = `foo=bar eq="a test with = signs" baz=3`
// value has an unquoted sign with no spaces but an equals sign
const t4 = `foo=bar unq=astr=with=equals?and*stuff baz=3`

func parseIntoMap(m map[string]interface{}, line []byte) error {
	f := func(key, val []byte) error {
		keyStr := string(key)
		valStr := string(val)
		if b, err := strconv.ParseBool(valStr); err == nil {
			m[keyStr] = b
			return nil
		}
		if i, err := strconv.Atoi(valStr); err == nil {
			m[keyStr] = i
			return nil
		}
		if f, err := strconv.ParseFloat(valStr, 64); err == nil {
			m[keyStr] = f
			return nil
		}
		m[keyStr] = valStr
		return nil
	}
	handler := logfmt.HandlerFunc(f)
	return logfmt.Unmarshal(line, handler)
}

func main() {
	for i, str := range []string{t0, t1, t2, t3, t4} {
		m := make(map[string]interface{})
		parseIntoMap(m, []byte(str))
		fmt.Printf("%d: `%s`\n", i, str)
		spew.Dump(m)
	}
}