1 files changed, 66 insertions, 0 deletions
diff --git a/formatDuration.go b/formatDuration.go
new file mode 100644
index 0000000..f945325
--- /dev/null
+++ b/formatDuration.go
@@ -0,0 +1,66 @@
+package cobol
+
+import (
+	"fmt"
+	"time"
+)
+
+func FormatDuration(d time.Duration) string {
+	result := ""
+
+	// check if it's more than a year
+	years := int(d.Hours()) / (24 * 365)
+	if years > 0 {
+		result += fmt.Sprintf("%dy", years)
+		return result
+	}
+
+	// check if it's more than a day
+	days := int(d.Hours()) / 24
+	if days > 0 {
+		result += fmt.Sprintf("%dd", days)
+		return result
+	}
+
+	// check if it's more than an hour
+	hours := int(d.Hours()) % 24
+	if hours > 0 {
+		result += fmt.Sprintf("%dh", hours)
+		return result
+	}
+
+	// check if it's more than a minute
+	minutes := int(d.Minutes()) % 60
+	if minutes > 0 {
+		result += fmt.Sprintf("%dm", minutes)
+		return result
+	}
+
+	// check if it's more than a second
+	seconds := int(d.Seconds()) % 60
+	if seconds > 0 {
+		result += fmt.Sprintf("%ds", seconds)
+		return result
+	}
+
+	// report in milliseconds
+	ms := int(d.Milliseconds())
+	if ms > 100 {
+		// todo: print .3s, etc ?
+	}
+	if ms > 0 {
+		result += fmt.Sprintf("%dms", ms)
+		return result
+	}
+
+	// report in milliseconds
+	mc := int(d.Microseconds())
+	if mc > 0 {
+		result += fmt.Sprintf("%dmc", mc)
+		return result
+	}
+
+	ns := int(d.Nanoseconds())
+	result += fmt.Sprintf("%dns", ns)
+	return result
+}