Factored out docker/rcli (remote cli protocol), docker/fake (mocking utilities) and docker/future (real utilities which don't yet fit in the core)

future/future.go

@@ -0,0 +1,39 @@
+package future
+
+import (
+	"crypto/sha256"
+	"io"
+	"fmt"
+	"time"
+)
+
+func ComputeId(content io.Reader) (string, error) {
+	h := sha256.New()
+	if _, err := io.Copy(h, content); err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("%x", h.Sum(nil)[:8]), nil
+}
+
+func HumanDuration(d time.Duration) string {
+	if seconds := int(d.Seconds()); seconds < 1 {
+		return "Less than a second"
+	} else if seconds < 60 {
+		return fmt.Sprintf("%d seconds", seconds)
+	} else if minutes := int(d.Minutes()); minutes == 1 {
+		return "About a minute"
+	} else if minutes < 60 {
+		return fmt.Sprintf("%d minutes", minutes)
+	} else if hours := int(d.Hours()); hours  == 1{
+		return "About an hour"
+	} else if hours < 48 {
+		return fmt.Sprintf("%d hours", hours)
+	} else if hours < 24 * 7 * 2 {
+		return fmt.Sprintf("%d days", hours / 24)
+	} else if hours < 24 * 30 * 3 {
+		return fmt.Sprintf("%d weeks", hours / 24 / 7)
+	} else if hours < 24 * 365 * 2 {
+		return fmt.Sprintf("%d months", hours / 24 / 30)
+	}
+	return fmt.Sprintf("%d years", d.Hours() / 24 / 365)
+}