Method Format

pkg/event/formatter.go:188–204

Format renders the event according to the template. Each {{ .Field }} tag is substituted with a colour-decorated string when colour output is available, or with the plain field value otherwise.

(e *Event)

// substituted with a colour-decorated string when colour output is available,
// or with the plain field value otherwise.
func (f *ColorFormatter) Format(e *Event) []byte {
	if !f.enabled {
		return f.f.Format(e)
	}

	var b bytes.Buffer
	b.WriteString(e.Type.arrow())

	// fasttemplate.Template.ExecuteFuncString calls tagWriter once per tag in
	// document order, passing the bare tag name (e.g. ".Seq", ".Type",
	// ".Params.file_path"). The writer writes the coloured substitution value.
	_, _ = f.f.t.ExecuteFunc(&b, func(w io.Writer, tag string) (int, error) {
		return io.WriteString(w, f.colourTag(tag, e))
	})

	return bytes.TrimRight(b.Bytes(), "\n")
}

// colourTag maps a bare tag name to its coloured string representation.
func (f *ColorFormatter) colourTag(tag string, e *Event) string {