Add functions for structured progress logging

internal/log/handlers/cli/cli.go

@@ -60,15 +60,25 @@ func New(w io.Writer) *Handler {
 	}
 }
 
-// HandleLog implements log.Handler.
-func (h *Handler) HandleLog(e *log.Entry) error {
+// TypedLog is used for handling special "typed" logs to the CLI
+func (h *Handler) TypedLog(t string, e *log.Entry) error {
+	switch t {
+	case "progress":
+		// XXX replace this with something more fancy like https://github.com/tj/go-progress
+		fmt.Fprintf(h.Writer, "%.1f%% [%s]: %s", e.Fields.Get("percentage").(float64)*100, e.Fields.Get("key"), e.Message)
+		fmt.Fprintln(h.Writer)
+		return nil
+	default:
+		return h.DefaultLog(e)
+	}
+}
+
+// DefaultLog is the default way of printing out logs
+func (h *Handler) DefaultLog(e *log.Entry) error {
 	color := Colors[e.Level]
 	level := Strings[e.Level]
 	names := e.Fields.Names()
 
-	h.mu.Lock()
-	defer h.mu.Unlock()
-
 	color.Fprintf(h.Writer, "%s %-25s", bold.Sprintf("%*s", h.Padding+1, level), e.Message)
 
 	for _, name := range names {
@@ -82,3 +92,16 @@ func (h *Handler) HandleLog(e *log.Entry) error {
 
 	return nil
 }
+
+// HandleLog implements log.Handler.
+func (h *Handler) HandleLog(e *log.Entry) error {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	t, isTyped := e.Fields["type"].(string)
+	if isTyped {
+		return h.TypedLog(t, e)
+	}
+
+	return h.DefaultLog(e)
+}