perf: process image directories concurrently

utils/utils.go

@@ -0,0 +1,66 @@
+package utils
+
+import (
+	"fmt"
+	"math"
+	"time"
+)
+
+// MessageType is a placeholder for the various the message types.
+type MessageType int
+
+// The message types used accross the CLI application.
+const (
+	DefaultMessage MessageType = iota
+	SuccessMessage
+	ErrorMessage
+	StatusMessage
+)
+
+// Colors used accross the CLI application.
+const (
+	ErrorColor   = "\x1b[31m"
+	SuccessColor = "\x1b[32m"
+	DefaultColor = "\x1b[0m"
+	StatusColor  = "\x1b[36m"
+)
+
+// DecorateText shows the message types in different colors.
+func DecorateText(s string, msgType MessageType) string {
+	switch msgType {
+	case SuccessMessage:
+		s = SuccessColor + s
+	case ErrorMessage:
+		s = ErrorColor + s
+	case DefaultMessage:
+		s = DefaultColor + s
+	case StatusMessage:
+		s = StatusColor + s
+	default:
+		return s
+	}
+	return s + "\x1b[0m"
+}
+
+// FormatTime formats time.Duration output to a human readable value.
+func FormatTime(d time.Duration) string {
+	if d.Seconds() < 60.0 {
+		return fmt.Sprintf("%ds", int64(d.Seconds()))
+	}
+	if d.Minutes() < 60.0 {
+		remainingSeconds := math.Mod(d.Seconds(), 60)
+		return fmt.Sprintf("%dm:%ds", int64(d.Minutes()), int64(remainingSeconds))
+	}
+	if d.Hours() < 24.0 {
+		remainingMinutes := math.Mod(d.Minutes(), 60)
+		remainingSeconds := math.Mod(d.Seconds(), 60)
+		return fmt.Sprintf("%dh:%dm:%ds",
+			int64(d.Hours()), int64(remainingMinutes), int64(remainingSeconds))
+	}
+	remainingHours := math.Mod(d.Hours(), 24)
+	remainingMinutes := math.Mod(d.Minutes(), 60)
+	remainingSeconds := math.Mod(d.Seconds(), 60)
+	return fmt.Sprintf("%dd:%dh:%dm:%ds",
+		int64(d.Hours()/24), int64(remainingHours),
+		int64(remainingMinutes), int64(remainingSeconds))
+}