blog: add syntax highlighting to RSS

blog.go

@@ -30,6 +30,8 @@ import (
 	"github.com/gorilla/feeds"
 	"github.com/gosimple/slug"
 	"github.com/yuin/goldmark"
+	highlighting "github.com/yuin/goldmark-highlighting"
+	"github.com/yuin/goldmark/extension"
 )
 
 const (
@@ -151,7 +153,11 @@ func genRss(posts posts) string {
 		Title:       "kokada's blog",
 		Description: "# dd if=/dev/urandom of=/dev/brain0",
 	}
-	md := goldmark.New(goldmark.WithExtensions(NewLinkRewriter(blogMainUrl, nil)))
+	md := goldmark.New(goldmark.WithExtensions(
+		NewLinkRewriter(blogMainUrl, nil),
+		extension.GFM,
+		highlighting.NewHighlighting(highlighting.WithStyle("monokai")),
+	))
 
 	var items []*feeds.Item
 	for el := posts.Back(); el != nil; el = el.Prev() {

go.mod

@@ -8,6 +8,11 @@ require (
 	github.com/gosimple/slug v1.14.0
 	github.com/teekennedy/goldmark-markdown v0.3.0
 	github.com/yuin/goldmark v1.7.4
+	github.com/yuin/goldmark-highlighting v0.0.0-20220208100518-594be1970594
 )
 
-require github.com/gosimple/unidecode v1.0.1 // indirect
+require (
+	github.com/alecthomas/chroma v0.10.0 // indirect
+	github.com/dlclark/regexp2 v1.4.0 // indirect
+	github.com/gosimple/unidecode v1.0.1 // indirect
+)

go.sum

@@ -1,5 +1,10 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/alecthomas/chroma v0.10.0 h1:7XDcGkCQopCNKjZHfYrNLraA+M7e0fMiJ/Mfikbfjek=
+github.com/alecthomas/chroma v0.10.0/go.mod h1:jtJATyUxlIORhUOFNA9NZDWGAQ8wpxQQqNSB4rjA/1s=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dlclark/regexp2 v1.4.0 h1:F1rxgk7p4uKjwIQxBs9oAXe5CqrXlCduYEJvrF4u93E=
+github.com/dlclark/regexp2 v1.4.0/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
 github.com/elliotchance/orderedmap/v2 v2.2.0 h1:7/2iwO98kYT4XkOjA9mBEIwvi4KpGB4cyHeOFOnj4Vk=
 github.com/elliotchance/orderedmap/v2 v2.2.0/go.mod h1:85lZyVbpGaGvHvnKa7Qhx7zncAdBIBq6u56Hb1PRU5Q=
 github.com/gorilla/feeds v1.2.0 h1:O6pBiXJ5JHhPvqy53NsjKOThq+dNFm8+DFrxBEdzSCc=
@@ -18,11 +23,18 @@ github.com/rhysd/go-fakeio v1.0.0 h1:+TjiKCOs32dONY7DaoVz/VPOdvRkPfBkEyUDIpM8FQY
 github.com/rhysd/go-fakeio v1.0.0/go.mod h1:joYxF906trVwp2JLrE4jlN7A0z6wrz8O6o1UjarbFzE=
 github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
 github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMTY=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/teekennedy/goldmark-markdown v0.3.0 h1:ik9/biVGCwGWFg8dQ3KVm2pQ/wiiG0whYiUcz9xH0W8=
 github.com/teekennedy/goldmark-markdown v0.3.0/go.mod h1:kMhDz8La77A9UHvJGsxejd0QUflN9sS+QXCqnhmxmNo=
+github.com/yuin/goldmark v1.4.5/go.mod h1:rmuwmfZ0+bvzB24eSC//bk1R1Zp3hM0OXYv/G2LIilg=
 github.com/yuin/goldmark v1.7.4 h1:BDXOHExt+A7gwPCJgPIIq7ENvceR7we7rOS9TNoLZeg=
 github.com/yuin/goldmark v1.7.4/go.mod h1:uzxRWxtg69N339t3louHJ7+O03ezfj6PlliRlaOzY1E=
+github.com/yuin/goldmark-highlighting v0.0.0-20220208100518-594be1970594 h1:yHfZyN55+5dp1wG7wDKv8HQ044moxkyGq12KFFMFDxg=
+github.com/yuin/goldmark-highlighting v0.0.0-20220208100518-594be1970594/go.mod h1:U9ihbh+1ZN7fR5Se3daSPoz1CGF9IYtSvWwVQtnzGHU=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0 h1:hjy8E9ON/egN1tAYqKb61G10WtihqetD4sz2H+8nIeA=
 gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

mataroa.go

@@ -27,6 +27,7 @@ import (
 
 	markdown "github.com/teekennedy/goldmark-markdown"
 	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/extension"
 )
 
 const (
@@ -110,7 +111,10 @@ func mustPostMataroaPost(md goldmark.Markdown, post post) (p mataroaResponse, r
 func publishToMataroa(posts posts) {
 	md := goldmark.New(
 		goldmark.WithRenderer(markdown.NewRenderer()),
-		goldmark.WithExtensions(NewLinkRewriter(mataroaBlogUrl, posts)),
+		goldmark.WithExtensions(
+			NewLinkRewriter(mataroaBlogUrl, posts),
+			extension.GFM,
+		),
 	)
 	for el := posts.Front(); el != nil; el = el.Next() {
 		post := el.Value