Add feeds

Fixes code-golf#104

assets/common.css

@@ -176,6 +176,8 @@ thead th {
     border-bottom-width: 2px;
 }
 
+.bold { font-weight: bold }
+
 .btn {
     border: solid 1px var(--color);
     color: var(--color);

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/SeerUK/assert v1.0.0
 	github.com/buildkite/terminal v3.2.0+incompatible
 	github.com/cv-library/negroni-brotli v0.1.0
+	github.com/gorilla/feeds v1.1.1
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/lib/pq v1.3.0
 	github.com/pmezard/go-difflib v1.0.0

go.sum

@@ -4,6 +4,8 @@ github.com/buildkite/terminal v3.2.0+incompatible h1:08p6611HADinUwK0oyxCaAsnFXV
 github.com/buildkite/terminal v3.2.0+incompatible/go.mod h1:iQavkS6X0wlozOmO2rxHYt/9mE5Ij2XTk6yGcclx6hk=
 github.com/cv-library/negroni-brotli v0.1.0 h1:XHp5az3a/+S/E0y9QgzvAQ6iKHwcaKfvMO83VKmH6o0=
 github.com/cv-library/negroni-brotli v0.1.0/go.mod h1:trJIsbpAH+Rex8NJCyemf2jEVucd7lcS8LTjvS2k6wY=
+github.com/gorilla/feeds v1.1.1 h1:HwKXxqzcRNg9to+BbvJog4+f3s/xzvtZXICcQGutYfY=
+github.com/gorilla/feeds v1.1.1/go.mod h1:Nk0jZrvPFZX1OBe5NPiddPw7CfwF6Q9eqzaBbaightA=
 github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4dN7jwJOQ1U=
 github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
 github.com/lib/pq v1.3.0 h1:/qkRGz8zljWiDcFvgpwUpwIAPu3r07TDvs3Rws+o/pU=

routes/feeds.go

@@ -0,0 +1,168 @@
+package routes
+
+import (
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/gorilla/feeds"
+	"github.com/julienschmidt/httprouter"
+)
+
+var atomFeed, jsonFeed, rssFeed []byte
+
+// TODO Trophies
+// f761931 Add "Happy Birthday, Code Golf" trophy
+// b8c8fc2 Add "Slowcoach" trophy
+// dbe1a24 Add "Inception" trophy
+// 412861e Add "It’s Over 9000!" trophy
+// b9b1f50 Add "The Watering Hole" trophy
+// eee3b47 Add "My God, It’s Full of Stars" trophy
+// 82c3f33 Add "Polyglot" trophy
+// 39b205c Add "ElePHPant in the Room" trophy
+// c1503f7 initial
+func init() {
+	feed := feeds.Feed{
+		Link:  &feeds.Link{Href: "https://code-golf.io/"},
+		Title: "Code Golf",
+	}
+
+	for _, i := range []struct {
+		sha, created, name string
+		hole               bool
+	}{
+		{"a9bbba9", "2020-01-03 19:05:17", "Rust", false},
+		{"fb227ed", "2019-11-17 17:32:14", "Abundant Numbers", true},
+		{"4e38900", "2019-07-11 16:34:13", "Ordinal Numbers", true},
+		{"de9369a", "2019-06-17 16:33:28", "Rock-paper-scissors-Spock-lizard", true},
+		{"5348743", "2019-06-12 22:10:04", "Ten-pin Bowling", true},
+		{"14290db", "2019-05-25 10:22:43", "√2", true},
+		{"269ff68", "2019-05-19 20:13:21", "Nim", false},
+		{"3cbc7cf", "2019-04-07 14:33:47", "Brainfuck", false},
+		{"c960e70", "2019-02-28 21:27:25", "C", false},
+		{"c689b8a", "2019-01-13 17:09:36", "Cubes", true},
+		{"2f87dea", "2018-12-03 18:34:16", "Leap Years", true},
+		{"1178818", "2018-11-15 19:16:17", "Sudoku", true},
+		{"447121b", "2018-09-02 16:27:32", "Julia", false},
+		{"00660df", "2018-08-08 23:11:21", "J", false},
+		{"edd2828", "2018-07-25 19:50:07", "Poker", true},
+		{"646df41", "2018-07-06 21:49:47", "Rule 110", true},
+		{"2080b94", "2018-06-07 07:22:01", "λ", true},
+		{"834750b", "2018-06-06 20:54:22", "Diamonds", true},
+		{"bd8e789", "2018-05-20 18:09:59", "Haskell", false},
+		{"7b72ebc", "2018-05-03 17:30:42", "Niven Numbers", true},
+		{"827599e", "2018-03-22 16:56:44", "Lisp", false},
+		{"5790715", "2018-02-18 21:01:24", "Morse Decoder", true},
+		{"5790715", "2018-02-18 21:01:24", "Morse Encoder", true},
+		{"05e21ff", "2018-01-27 23:39:06", "Brainfuck", true},
+		{"922fb91", "2018-01-10 20:36:47", "Divisors", true},
+		{"d83fcf9", "2018-01-07 12:52:41", "Lua", false},
+		{"079513e", "2017-12-08 17:12:30", "12 Days of Christmas", true},
+		{"30fc7c2", "2017-12-05 15:27:34", "Christmas Trees", true},
+		{"2dfbcfe", "2017-11-30 19:23:00", "Pangram Grep", true},
+		{"31d18c8", "2017-11-28 20:31:07", "τ", true},
+		{"a3ef71c", "2017-11-12 03:11:36", "Bash", false},
+		{"0219147", "2017-11-11 00:02:40", "φ", true},
+		{"63510fc", "2017-11-10 23:21:35", "Roman to Arabic", true},
+		{"ee1742f", "2017-11-07 21:56:03", "Quine", true},
+		{"ce2d6b9", "2017-10-31 04:39:43", "Happy Numbers", true},
+		{"63bad53", "2017-10-18 19:13:56", "Pernicious Numbers", true},
+		{"e71743f", "2017-10-18 18:24:51", "Evil Numbers", true},
+		{"e71743f", "2017-10-18 18:24:51", "Odious Numbers", true},
+		{"35da66a", "2017-10-08 02:11:33", "Sierpiński Triangle", true},
+		{"aa9e81e", "2017-10-08 01:39:39", "Emirp Numbers", true},
+		{"ac9b179", "2017-10-04 13:00:28", "Prime Numbers", true},
+		{"39ce198", "2017-09-29 20:41:30", "Spelling Numbers", true},
+		{"bb1a117", "2017-09-20 17:18:23", "𝑒", true},
+		{"7475f08", "2017-09-16 13:57:43", "Fibonacci", true},
+		{"7d34727", "2017-08-27 23:41:32", "Seven Segment", true},
+		{"b1d91b8", "2017-07-22 22:22:25", "Arabic to Roman", true},
+		{"07aa3ed", "2017-07-16 00:18:21", "JavaScript", false},
+		{"b1d083d", "2017-07-15 21:24:09", "Python", false},
+		{"26cf869", "2017-07-15 20:28:52", "Pascal’s Triangle", true},
+		{"15bc065", "2017-07-06 21:37:43", "99 Bottles of Beer", true},
+		{"9cc775e", "2017-07-02 17:00:43", "π", true},
+		{"dc1b9a8", "2017-06-14 22:03:21", "PHP", false},
+		{"c5468f0", "2017-06-12 23:34:47", "Raku", false},
+		{"8029a96", "2017-05-08 23:06:22", "Ruby", false},
+	} {
+		link := "https://code-golf.io/"
+
+		if !i.hole {
+			link += "scores/all-holes/"
+		}
+
+		link += url.PathEscape(strings.ReplaceAll(strings.ToLower(i.name), " ", "-"))
+
+		item := feeds.Item{
+			Description: "Added the <a href=" + link + ">“" + i.name + "”</a> ",
+			Id:          link,
+			Link:        &feeds.Link{Href: link},
+			Title:       "Added “" + i.name + "” ",
+		}
+
+		if i.hole {
+			item.Title += "Hole"
+			item.Description += "hole"
+		} else {
+			item.Title += "Language"
+			item.Description += "language"
+		}
+
+		item.Description += " via <a href=https://github.com/JRaspass/code-golf/commit/" +
+			i.sha + ">" + i.sha + "</a>."
+
+		var err error
+		if item.Created, err = time.Parse("2006-01-02 15:04:05", i.created); err != nil {
+			panic(err)
+		}
+
+		feed.Items = append(feed.Items, &item)
+
+		if feed.Created.IsZero() {
+			feed.Created = item.Created
+		}
+	}
+
+	feed.Title = "Code Golf (Atom Feed)"
+
+	if data, err := feed.ToAtom(); err != nil {
+		panic(err)
+	} else {
+		atomFeed = []byte(data)
+	}
+
+	feed.Title = "Code Golf (JSON Feed)"
+
+	if data, err := feed.ToJSON(); err != nil {
+		panic(err)
+	} else {
+		jsonFeed = []byte(data)
+	}
+
+	feed.Title = "Code Golf (RSS Feed)"
+
+	if data, err := feed.ToRss(); err != nil {
+		panic(err)
+	} else {
+		rssFeed = []byte(data)
+	}
+}
+
+// Feeds serves /feeds/:feed
+func Feeds(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
+	switch ps.ByName("feed") {
+	case "atom":
+		w.Header().Set("Content-Type", "application/atom+xml; charset=utf-8")
+		w.Write(atomFeed)
+	case "json":
+		w.Header().Set("Content-Type", "application/json")
+		w.Write(jsonFeed)
+	case "rss":
+		w.Header().Set("Content-Type", "application/rss+xml; charset=utf-8")
+		w.Write(rssFeed)
+	default:
+		Render(w, r, http.StatusNotFound, "404", "", nil)
+	}
+}

routes/routes.go

@@ -25,6 +25,7 @@ func init() {
 	Router.GET("/assets/:asset", asset)
 	Router.GET("/callback", callback)
 	Router.GET("/favicon.ico", asset)
+	Router.GET("/feeds/:feed", Feeds)
 	Router.GET("/ideas", ideas)
 	Router.GET("/log-out", logOut)
 	Router.GET("/random", random)

views/header.html

@@ -3,6 +3,9 @@
 <html lang=en>
 
 <link rel=stylesheet href={{ .CommonCssPath }}>
+<link rel=alternate href=/feeds/atom type=application/atom+xml>
+<link rel=alternate href=/feeds/rss  type=application/rss+xml>
+<link rel=alternate href=/feeds/json type=application/json>
 
 {{/* FIXME This won't change for dark themes :-( */}}
 <meta name=theme-color content=#343A40>

views/index.html

@@ -47,4 +47,11 @@ <h2>{{ .Hole.Name }}</h2>
         </span>
     </a>
 {{ end }}
+    <p class="right span">
+        <span class=bold>News:</span>
+        <a href=/feeds/atom>Atom</a>
+        |
+        <a href=/feeds/json>JSON</a>
+        |
+        <a href=/feeds/rss>RSS</a>
 </main>