Rewrote flag parsing to use flag-like interface

go.mod

@@ -3,7 +3,7 @@ module git.sr.ht/~sircmpwn/openring
 go 1.12
 
 require (
-	git.sr.ht/~sircmpwn/getopt v0.0.0-20190214165041-9a4f886f9fc7
+	git.sr.ht/~sircmpwn/getopt v0.0.0-20190621174457-292febf82fd0
 	github.com/SlyMarbo/rss v1.0.1
 	github.com/mattn/go-runewidth v0.0.4
 	github.com/microcosm-cc/bluemonday v1.0.2

go.sum

@@ -1,5 +1,7 @@
 git.sr.ht/~sircmpwn/getopt v0.0.0-20190214165041-9a4f886f9fc7 h1:xTFH5S/3ltiRvAtETLLDFWm5nVIouT5GeCPHm8UaVEU=
 git.sr.ht/~sircmpwn/getopt v0.0.0-20190214165041-9a4f886f9fc7/go.mod h1:wMEGFFFNuPos7vHmWXfszqImLppbc0wEhh6JBfJIUgw=
+git.sr.ht/~sircmpwn/getopt v0.0.0-20190621174457-292febf82fd0 h1:gUeOEsT0mhoCKxKYJk8HeYtUZME686xs70eG2l80W5U=
+git.sr.ht/~sircmpwn/getopt v0.0.0-20190621174457-292febf82fd0/go.mod h1:wMEGFFFNuPos7vHmWXfszqImLppbc0wEhh6JBfJIUgw=
 github.com/SlyMarbo/rss v1.0.1 h1:fiaIU5UhcXauVOniHOIocWG7uj8Ej6pHNarMGPJilzA=
 github.com/SlyMarbo/rss v1.0.1/go.mod h1:JNF+T33oj4m5WLCQXpBTCgO+SxRbYVgdiiimHNgzcbA=
 github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394 h1:OYA+5W64v3OgClL+IrOD63t4i/RW7RqrAVl9LTZ9UqQ=

openring.go

@@ -8,15 +8,35 @@ import (
 	"net/url"
 	"os"
 	"sort"
-	"strconv"
+	"strings"
 	"time"
 
+	"git.sr.ht/~sircmpwn/getopt"
+
 	"github.com/SlyMarbo/rss"
 	"github.com/mattn/go-runewidth"
 	"github.com/microcosm-cc/bluemonday"
-	"git.sr.ht/~sircmpwn/getopt"
 )
 
+type urlSlice []*url.URL
+
+func (us *urlSlice) String() string {
+	var str []string
+	for _, u := range *us {
+		str = append(str, u.String())
+	}
+	return strings.Join(str, ", ")
+}
+
+func (us *urlSlice) Set(val string) error {
+	u, err := url.Parse(val)
+	if err != nil {
+		return err
+	}
+	*us = append(*us, u)
+	return nil
+}
+
 type Article struct {
 	Date        time.Time
 	Link        string
@@ -28,48 +48,23 @@ type Article struct {
 
 func main() {
 	var (
-		narticles  int = 3
+		narticles  = getopt.Int("n", 3, "article count")
-		perSource  int = 1
+		perSource  = getopt.Int("p", 1, "articles to take from each source")
-		summaryLen int = 256
+		summaryLen = getopt.Int("l", 256, "length of summaries")
 		sources    []*url.URL
 	)
+	getopt.Var((*urlSlice)(&sources), "s", "list of sources")
 
-	opts, optind, err := getopt.Getopts(os.Args[1:], "l:n:p:s:")
+	getopt.Usage = func() {
-	if err != nil {
+		log.Fatalf("Usage: %s [-s https://source.rss...] < in.html > out.html",
-		panic(err)
-	}
-	for _, opt := range opts {
-		switch opt.Option {
-		case 'l':
-			summaryLen, err = strconv.Atoi(opt.Value)
-			if err != nil {
-				panic(err)
-			}
-		case 'n':
-			narticles, err = strconv.Atoi(opt.Value)
-			if err != nil {
-				panic(err)
-			}
-		case 'p':
-			perSource, err = strconv.Atoi(opt.Value)
-			if err != nil {
-				panic(err)
-			}
-		case 's':
-			u, err := url.Parse(opt.Value)
-			if err != nil {
-				panic(err)
-			}
-			sources = append(sources, u)
-		}
-	}
-
-	if len(os.Args[optind+1:]) != 0 {
-		log.Fatalf(
-			"Usage: %s [-s https://source.rss...] < in.html > out.html",
 			os.Args[0])
 	}
 
+	err := getopt.Parse()
+	if err != nil {
+		panic(err)
+	}
+
 	input, err := ioutil.ReadAll(os.Stdin)
 	if err != nil {
 		panic(err)
@@ -111,8 +106,8 @@ func main() {
 			continue
 		}
 		items := feed.Items
-		if len(items) > perSource {
+		if len(items) > *perSource {
-			items = items[:perSource]
+			items = items[:*perSource]
 		}
 		for _, item := range items {
 			raw_summary := item.Summary
@@ -120,7 +115,7 @@ func main() {
 				raw_summary = html.UnescapeString(item.Content)
 			}
 			summary := runewidth.Truncate(
-				policy.Sanitize(raw_summary), summaryLen, "…")
+				policy.Sanitize(raw_summary), *summaryLen, "…")
 			articles = append(articles, &Article{
 				Date:        item.Date,
 				SourceLink:  feed.Link,
@@ -134,10 +129,10 @@ func main() {
 	sort.Slice(articles, func(i, j int) bool {
 		return articles[i].Date.After(articles[j].Date)
 	})
-	if len(articles) < narticles {
+	if len(articles) < *narticles {
-		narticles = len(articles)
+		*narticles = len(articles)
 	}
-	articles = articles[:narticles]
+	articles = articles[:*narticles]
 	err = tmpl.Execute(os.Stdout, struct {
 		Articles []*Article
 	}{