refactor(processor): extract some functions into an utils.go file

internal/reader/processor/utils.go

@@ -0,0 +1,82 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package processor // import "miniflux.app/v2/internal/reader/processor"
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strconv"
+	"time"
+
+	"github.com/tdewolff/minify/v2"
+	"github.com/tdewolff/minify/v2/html"
+)
+
+// TODO: use something less horrible than a regex to parse ISO 8601 durations.
+
+var (
+	iso8601Regex = regexp.MustCompile(`^P((?P<year>\d+)Y)?((?P<month>\d+)M)?((?P<week>\d+)W)?((?P<day>\d+)D)?(T((?P<hour>\d+)H)?((?P<minute>\d+)M)?((?P<second>\d+)S)?)?$`)
+)
+
+func parseISO8601(from string) (time.Duration, error) {
+	var match []string
+	var d time.Duration
+
+	if iso8601Regex.MatchString(from) {
+		match = iso8601Regex.FindStringSubmatch(from)
+	} else {
+		return 0, errors.New("youtube: could not parse duration string")
+	}
+
+	for i, name := range iso8601Regex.SubexpNames() {
+		part := match[i]
+		if i == 0 || name == "" || part == "" {
+			continue
+		}
+
+		val, err := strconv.ParseInt(part, 10, 64)
+		if err != nil {
+			return 0, err
+		}
+
+		switch name {
+		case "hour":
+			d += time.Duration(val) * time.Hour
+		case "minute":
+			d += time.Duration(val) * time.Minute
+		case "second":
+			d += time.Duration(val) * time.Second
+		default:
+			return 0, fmt.Errorf("youtube: unknown field %s", name)
+		}
+	}
+
+	return d, nil
+}
+
+func minifyContent(content string) string {
+	m := minify.New()
+
+	// Options required to avoid breaking the HTML content.
+	m.Add("text/html", &html.Minifier{
+		KeepEndTags: true,
+		KeepQuotes:  true,
+	})
+
+	if minifiedHTML, err := m.String("text/html", content); err == nil {
+		content = minifiedHTML
+	}
+
+	return content
+}
+
+func containsRegexPattern(pattern string, entries []string) bool {
+	for _, entry := range entries {
+		if matched, _ := regexp.MatchString(pattern, entry); matched {
+			return true
+		}
+	}
+	return false
+}