43 lines
679 B
Go
43 lines
679 B
Go
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package main
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import (
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"fmt"
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"strings"
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"time"
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)
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type TagChange struct {
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Start string
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Value string
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}
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type TagChangeList []TagChange
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type TagKey string
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type TagMap map[TagKey]TagChangeList
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func getTagAt(key string, t time.Time) (string, error) {
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// Guaranteed to be in local time
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date := t.Format("2006-01-02")
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tagChanges := tags[TagKey(key)]
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if tagChanges == nil {
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return "", fmt.Errorf("tag key not found: %s", key)
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}
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value := ""
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for _, change := range tagChanges {
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if strings.Compare(change.Start, date) > 0 {
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break
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}
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value = change.Value
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}
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if value == "" {
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return "", fmt.Errorf("tag key '%s' has no value yet", key)
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}
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return value, nil
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}
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