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type Formatter ¶
type Formatter interface {
io.Writer
Format(format string, args ...interface{}) (n int, errno error)
}
Formatter is an io.Writer extended by a fmt.Printf like function Format
func IndentFormatter ¶
IndentFormatter returns a new Formatter which interprets %i and %u in the Format() format string as indent and undent commands. The commands can nest. The Formatter writes to io.Writer 'w' and inserts one 'indent' string per current indent level value. Behaviour of commands reaching negative indent levels is undefined.
IndentFormatter(os.Stdout, "\t").Format("abc%d%%e%i\nx\ny\n%uz\n", 3)
output:
abc3%e x y z
The Go quoted string literal form of the above is:
"abc%%e\n\tx\n\tx\nz\n"
The commands can be scattered between separate invocations of Format(), i.e. the formatter keeps track of the indent level and knows if it is positioned on start of a line and should emit indentation(s). The same output as above can be produced by e.g.:
f := IndentFormatter(os.Stdout, " ")
f.Format("abc%d%%e%i\nx\n", 3)
f.Format("y\n%uz\n")
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