// Copyright 2025 Stefan Prodan.
// SPDX-License-Identifier: AGPL-3.0
package inputs
import (
"strings"
"unicode"
)
// NormalizedKey is a type alias for string that represents
// a normalized key for use in templates.
type NormalizedKey string
// NormalizeKeyForTemplate normalizes the given string
// to a consistent format for use as a key in maps fed
// to Go templates.
//
// We convert uppercase letters to lowercase, replace
// spaces and punctuation with '_', and remove any
// characters not in [a-z0-9_]. Then we split the
// words by '_' and join only the resulting non-empty
// words back together with '_'.
func NormalizeKeyForTemplate(key string) NormalizedKey {
// Map characters according to the rules above.
key = strings.Map(func(r rune) rune {
r = unicode.ToLower(r)
if unicode.IsSpace(r) || unicode.IsPunct(r) {
return '_'
}
if ('a' <= r && r <= 'z') || ('0' <= r && r <= '9') {
return r
}
return -1
}, key)
// Split by '_' and rejoin non-empty words with '_'.
var nonEmptyWords []string
for word := range strings.SplitSeq(key, "_") {
if word != "" {
nonEmptyWords = append(nonEmptyWords, word)
}
}
key = strings.Join(nonEmptyWords, "_")
return NormalizedKey(key)
}
