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// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
// Package readingtime provides a function to estimate the reading time of an article.
package readingtime
import (
"math"
"strings"
"unicode/utf8"
"miniflux.app/v2/internal/reader/sanitizer"
"github.com/abadojack/whatlanggo"
)
// EstimateReadingTime returns the estimated reading time of an article in minute.
func EstimateReadingTime(content string, defaultReadingSpeed, cjkReadingSpeed int) int {
sanitizedContent := sanitizer.StripTags(content)
// Litterature on language detection says that around 100 signes is enough, we're safe here.
truncationPoint := int(math.Min(float64(len(sanitizedContent)), 250))
// We're only interested in identifying Japanse/Chinese/Korean
options := whatlanggo.Options{
Whitelist: map[whatlanggo.Lang]bool{
whatlanggo.Jpn: true,
whatlanggo.Cmn: true,
whatlanggo.Kor: true,
},
}
langInfo := whatlanggo.DetectWithOptions(sanitizedContent[:truncationPoint], options)
if langInfo.IsReliable() {
return int(math.Ceil(float64(utf8.RuneCountInString(sanitizedContent)) / float64(cjkReadingSpeed)))
}
nbOfWords := len(strings.Fields(sanitizedContent))
return int(math.Ceil(float64(nbOfWords) / float64(defaultReadingSpeed)))
}
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