Problem: strings.Title is deprecated

Solution: use golang.org/x/text/cases instead

go.mod

@@ -13,5 +13,6 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.7.0
 	golang.org/x/net v0.0.0-20211013171255-e13a2654a71e
+	golang.org/x/text v0.3.7
 	willnorris.com/go/microformats v1.1.0
 )

go.sum

@@ -1234,6 +1234,7 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=

pkg/rss/rss_1.0.go

@@ -5,8 +5,10 @@ import (
 	"encoding/xml"
 	"fmt"
 	"sort"
-	"strings"
 	"time"
+
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 )
 
 func parseRSS1(data []byte) (*Feed, error) {
@@ -29,6 +31,8 @@ func parseRSS1(data []byte) (*Feed, error) {
 	out.Description = channel.Description
 	out.Link = channel.Link
 	out.Image = channel.Image.Image()
+
+	titleCaser := cases.Title(language.English)
 	if channel.MinsToLive != 0 {
 		sort.Ints(channel.SkipHours)
 		next := time.Now().Add(time.Duration(channel.MinsToLive) * time.Minute)
@@ -41,7 +45,7 @@ func parseRSS1(data []byte) (*Feed, error) {
 		for trying {
 			trying = false
 			for _, day := range channel.SkipDays {
-				if strings.Title(day) == next.Weekday().String() {
+				if titleCaser.String(day) == next.Weekday().String() {
 					next.Add(time.Duration(24-next.Hour()) * time.Hour)
 					trying = true
 					break

pkg/rss/rss_2.0.go

@@ -5,8 +5,10 @@ import (
 	"encoding/xml"
 	"fmt"
 	"sort"
-	"strings"
 	"time"
+
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 )
 
 func parseRSS2(data []byte) (*Feed, error) {
@@ -38,6 +40,7 @@ func parseRSS2(data []byte) (*Feed, error) {
 
 	out.Image = channel.Image.Image()
 	if channel.MinsToLive != 0 {
+		titleCaser := cases.Title(language.English)
 		sort.Ints(channel.SkipHours)
 		next := time.Now().Add(time.Duration(channel.MinsToLive) * time.Minute)
 		for _, hour := range channel.SkipHours {
@@ -49,7 +52,7 @@ func parseRSS2(data []byte) (*Feed, error) {
 		for trying {
 			trying = false
 			for _, day := range channel.SkipDays {
-				if strings.Title(day) == next.Weekday().String() {
+				if titleCaser.String(day) == next.Weekday().String() {
 					next.Add(time.Duration(24-next.Hour()) * time.Hour)
 					trying = true
 					break