extract date parser to a new file

src/parser/util.go

@@ -0,0 +1,35 @@
+package parser
+
+import (
+	"encoding/xml"
+	"io"
+	"regexp"
+	"strings"
+
+	"golang.org/x/net/html/charset"
+)
+
+func firstNonEmpty(vals ...string) string {
+	for _, val := range vals {
+		valTrimmed := strings.TrimSpace(val)
+		if len(valTrimmed) > 0 {
+			return valTrimmed
+		}
+	}
+	return ""
+}
+
+var linkRe = regexp.MustCompile(`(https?:\/\/\S+)`)
+
+func plain2html(text string) string {
+	text = linkRe.ReplaceAllString(text, `<a href="$1">$1</a>`)
+	text = strings.ReplaceAll(text, "\n", "<br>")
+	return text
+}
+
+func xmlDecoder(r io.Reader) *xml.Decoder {
+	decoder := xml.NewDecoder(r)
+	decoder.Strict = false
+	decoder.CharsetReader = charset.NewReaderLabel
+	return decoder
+}