2 files changed, 57 insertions, 0 deletions
diff --git a/weed/util/inits.go b/weed/util/inits.go
new file mode 100644
index 000000000..dfbf9da5f
--- /dev/null
+++ b/weed/util/inits.go
@@ -0,0 +1,43 @@
+package util
+
+import (
+	"fmt"
+	"sort"
+)
+
+// HumanReadableInts joins a serials of inits into a smart one like 1-3 5 7-10 for human readable.
+func HumanReadableInts(ids ...int) string {
+	sort.Ints(ids)
+
+	s := ""
+	start := 0
+	last := 0
+
+	for i, v := range ids {
+		if i == 0 {
+			start = v
+			last = v
+			s = fmt.Sprintf("%d", v)
+			continue
+		}
+
+		if last+1 == v {
+			last = v
+			continue
+		}
+
+		if last > start {
+			s += fmt.Sprintf("-%d", last)
+		}
+
+		s += fmt.Sprintf(" %d", v)
+		start = v
+		last = v
+	}
+
+	if last != start {
+		s += fmt.Sprintf("-%d", last)
+	}
+
+	return s
+}
diff --git a/weed/util/inits_test.go b/weed/util/inits_test.go
new file mode 100644
index 000000000..f1ccb4f7b
--- /dev/null
+++ b/weed/util/inits_test.go
@@ -0,0 +1,14 @@
+package util
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestHumanReadableInts(t *testing.T) {
+	assert.Equal(t, "1-3", HumanReadableInts(1, 2, 3))
+	assert.Equal(t, "1 3", HumanReadableInts(1, 3))
+	assert.Equal(t, "1 3 5", HumanReadableInts(5, 1, 3))
+	assert.Equal(t, "1-3 5", HumanReadableInts(1, 2, 3, 5))
+	assert.Equal(t, "1-3 5 7-9", HumanReadableInts(7, 9, 8, 1, 2, 3, 5))
+}