commands: Make the --poll flag a duration

So you can do:

```
hugo server --poll 700ms
```

See #8720

1 files changed, 11 insertions, 0 deletions

diff --git a/common/types/convert_test.go b/common/types/convert_test.go
index 364228f41..88b303604 100644
--- a/common/types/convert_test.go
+++ b/common/types/convert_test.go
@@ -16,6 +16,7 @@ package types
 import (
 	"encoding/json"
 	"testing"
+	"time"
 
 	qt "github.com/frankban/quicktest"
 )
@@ -36,3 +37,13 @@ func TestToString(t *testing.T) {
 	c.Assert(ToString([]byte("Hugo")), qt.Equals, "Hugo")
 	c.Assert(ToString(json.RawMessage("Hugo")), qt.Equals, "Hugo")
 }
+
+func TestToDuration(t *testing.T) {
+	c := qt.New(t)
+
+	c.Assert(ToDuration("200ms"), qt.Equals, 200*time.Millisecond)
+	c.Assert(ToDuration("200"), qt.Equals, 200*time.Millisecond)
+	c.Assert(ToDuration("4m"), qt.Equals, 4*time.Minute)
+	c.Assert(ToDuration("asdfadf"), qt.Equals, time.Duration(0))
+
+}