func (s *cloudSuite) TestRegionNames(c *gc.C) {
regions := []cloud.Region{
{Name: "mars"},
{Name: "earth"},
{Name: "jupiter"},
}
names := cloud.RegionNames(regions)
c.Assert(names, gc.DeepEquals, []string{"earth", "jupiter", "mars"})
c.Assert(cloud.RegionNames([]cloud.Region{}), gc.HasLen, 0)
c.Assert(cloud.RegionNames(nil), gc.HasLen, 0)
}
// queryRegion asks the user to pick a region of the ones passed in. The first
// region in the list will be the default.
func queryRegion(cloud string, regions []jujucloud.Region, scanner *bufio.Scanner, w io.Writer) (string, error) {
fmt.Fprintf(w, "Regions in %s:\n", cloud)
names := jujucloud.RegionNames(regions)
// add an empty string to allow for a default value. Also gives us an extra
// line return after the list of names.
names = append(names, "")
if _, err := fmt.Fprintln(w, strings.Join(names, "\n")); err != nil {
return "", errors.Trace(err)
}
verify := interact.MatchOptions(names, errors.Errorf("Invalid region."))
defaultRegion := regions[0].Name
query := fmt.Sprintf("Select a region in %s [%s]: ", cloud, defaultRegion)
region, err := interact.QueryVerify([]byte(query), scanner, w, verify)
if err != nil {
return "", errors.Trace(err)
}
if region == "" {
return defaultRegion, nil
}
regionName, ok := interact.FindMatch(region, names)
if !ok {
// should be impossible
return "", errors.Errorf("invalid region name chosen: %s", region)
}
return regionName, nil
}