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master
cli/util/printer.go
58 строк
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Aravind Shankar
cli: update tests (#47)
06 июл 2018, 08:06
06 июл 2018, 08:06
1998e21
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package util import ( "fmt" "io" ) const ( LEVEL_0 = iota LEVEL_1 LEVEL_2 LEVEL_3 ) // PrefixWriter can write text at various indentation levels. type PrefixWriter interface { // Write writes text with the specified indentation level. Write(level int, format string, a ...interface{}) // WriteLine writes an entire line with no indentation level. WriteLine(a ...interface{}) // Flush forces indendation to be reset. Flush() } // prefixWriter implements PrefixWriter type prefixWriter struct { out io.Writer } var _ PrefixWriter = &prefixWriter{} // NewPrefixWriter creates a new PrefixWriter. func NewPrefixWriter(out io.Writer) PrefixWriter { return &prefixWriter{out: out} } func (pw *prefixWriter) Write(level int, format string, a ...interface{}) { levelSpace := " " prefix := "" for i := 0; i < level; i++ { prefix += levelSpace } fmt.Fprintf(pw.out, prefix+format, a...) } func (pw *prefixWriter) WriteLine(a ...interface{}) { fmt.Fprintln(pw.out, a...) } func (pw *prefixWriter) Flush() { if f, ok := pw.out.(flusher); ok { f.Flush() } } type flusher interface { Flush() }