1 files changed, 31 insertions, 0 deletions
diff --git a/internal/reader/readingtime/readingtime.go b/internal/reader/readingtime/readingtime.go
new file mode 100644
index 00000000..faf78471
--- /dev/null
+++ b/internal/reader/readingtime/readingtime.go
@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package readtime 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)
+	langInfo := whatlanggo.Detect(sanitizedContent)
+
+	var timeToReadInt int
+	if langInfo.IsReliable() && (langInfo.Lang == whatlanggo.Jpn || langInfo.Lang == whatlanggo.Cmn || langInfo.Lang == whatlanggo.Kor) {
+		timeToReadInt = int(math.Ceil(float64(utf8.RuneCountInString(sanitizedContent)) / float64(cjkReadingSpeed)))
+	} else {
+		nbOfWords := len(strings.Fields(sanitizedContent))
+		timeToReadInt = int(math.Ceil(float64(nbOfWords) / float64(defaultReadingSpeed)))
+	}
+
+	return timeToReadInt
+}