69 lines
1.3 KiB
Go
69 lines
1.3 KiB
Go
package flags
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import (
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"crypto/sha256"
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"encoding/binary"
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"errors"
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"fmt"
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"math/rand"
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)
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func shuffleSliceRandom(slice []string) []string {
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shuffled := make([]string, len(slice))
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copy(shuffled, slice)
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for i := len(shuffled) - 1; i > 0; i-- {
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j := rand.Intn(i + 1)
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shuffled[i], shuffled[j] = shuffled[j], shuffled[i]
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}
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return shuffled
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}
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func shuffleSlice(slice []string, seed string) []string {
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hasher := sha256.New()
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hasher.Write([]byte(seed))
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hash := hasher.Sum(nil)
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seedInt := int64(binary.LittleEndian.Uint64(hash[:8]))
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r := rand.New(rand.NewSource(seedInt))
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shuffled := make([]string, len(slice))
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copy(shuffled, slice)
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r.Shuffle(len(shuffled), func(i, j int) {
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shuffled[i], shuffled[j] = shuffled[j], shuffled[i]
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})
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return shuffled
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}
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func filterCountriesByTags(tags []string) (error, []string) {
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var result []string
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for _, tag := range tags {
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isSupported := false
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for _, supportedTag := range supportedTags {
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if tag == supportedTag {
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isSupported = true
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}
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}
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if isSupported == false {
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return errors.New(fmt.Sprintf("unsupported tag %v", tag)), result
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}
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}
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for _, country := range countryCodes {
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for _, tag := range tags {
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for _, cTag := range country.Tags {
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if cTag == tag {
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result = append(result, country.Code)
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}
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}
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}
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}
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return nil, result
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}
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