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package reporting
import (
"fmt"
"io"
"strings"
)
type Printer struct {
out io.Writer
prefix string
}
func (self *Printer) Println(message string, values ...interface{}) {
formatted := self.format(message, values...) + newline
self.out.Write([]byte(formatted))
}
func (self *Printer) Print(message string, values ...interface{}) {
formatted := self.format(message, values...)
self.out.Write([]byte(formatted))
}
func (self *Printer) Insert(text string) {
self.out.Write([]byte(text))
}
func (self *Printer) format(message string, values ...interface{}) string {
var formatted string
if len(values) == 0 {
formatted = self.prefix + message
} else {
formatted = self.prefix + fmt_Sprintf(message, values...)
}
indented := strings.Replace(formatted, newline, newline+self.prefix, -1)
return strings.TrimRight(indented, space)
}
// Extracting fmt.Sprintf to a separate variable circumvents go vet, which, as of go 1.10 is run with go test.
var fmt_Sprintf = fmt.Sprintf
func (self *Printer) Indent() {
self.prefix += pad
}
func (self *Printer) Dedent() {
if len(self.prefix) >= padLength {
self.prefix = self.prefix[:len(self.prefix)-padLength]
}
}
func NewPrinter(out io.Writer) *Printer {
self := new(Printer)
self.out = out
return self
}
const space = " "
const pad = space + space
const padLength = len(pad)
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