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package cluster
import "sort"
// SortRegions sorts regions. first by length those 3-character
// or shorter, and then by length. It's mostly aimed at
// supporting ISO-3166 order
func SortRegions(regions []string) []string {
sort.Slice(regions, func(i, j int) bool {
r1, r2 := regions[i], regions[j]
switch {
case len(r1) < 4:
switch {
case len(r1) < len(r2):
return true
case len(r1) > len(r2):
return false
default:
return r1 < r2
}
case len(r2) < 4:
return false
default:
return r1 < r2
}
})
return regions
}