Implement rendering Posts to html

8 files changed, 332 insertions, 23 deletions

diff --git a/srv/src/go.mod b/srv/src/go.mod
index 48ca311..2f9bf4b 100644
--- a/srv/src/go.mod
+++ b/srv/src/go.mod
@@ -3,17 +3,20 @@ module github.com/mediocregopher/blog.mediocregopher.com/srv
 go 1.16
 
 require (
-	github.com/adrg/frontmatter v0.2.0 // indirect
+	github.com/adrg/frontmatter v0.2.0
 	github.com/emersion/go-sasl v0.0.0-20200509203442-7bfe0ed36a21
 	github.com/emersion/go-smtp v0.15.0
+	github.com/gomarkdown/markdown v0.0.0-20220510115730-2372b9aa33e5
 	github.com/google/uuid v1.3.0
-	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/gorilla/websocket v1.4.2
 	github.com/mattn/go-sqlite3 v1.14.8
 	github.com/mediocregopher/mediocre-go-lib/v2 v2.0.0-beta.0.0.20220506011745-cbeee71cb1ee
-	github.com/mediocregopher/radix/v4 v4.0.0-beta.1.0.20210726230805-d62fa1b2e3cb // indirect
+	github.com/mediocregopher/radix/v4 v4.0.0-beta.1.0.20210726230805-d62fa1b2e3cb
 	github.com/rubenv/sql-migrate v0.0.0-20210614095031-55d5740dbbcc
 	github.com/stretchr/testify v1.7.0
 	github.com/tilinna/clock v1.1.0
 	github.com/ziutek/mymysql v1.5.4 // indirect
-	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 // indirect
+	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5
+	golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e // indirect
+	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
 )
diff --git a/srv/src/go.sum b/srv/src/go.sum
index 79b2bf6..358c3d6 100644
--- a/srv/src/go.sum
+++ b/srv/src/go.sum
@@ -57,6 +57,8 @@ github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4er
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/gomarkdown/markdown v0.0.0-20220510115730-2372b9aa33e5 h1:mjLaNMRojfgo2qgSdEX1CzmG7rHTeOWZdO1T1sgjEb0=
+github.com/gomarkdown/markdown v0.0.0-20220510115730-2372b9aa33e5/go.mod h1:JDGcbDT52eL4fju3sZ4TeHGsQwhG9nbDV21aMyhwPoA=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
@@ -109,8 +111,6 @@ github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A
 github.com/mattn/go-sqlite3 v1.14.8 h1:gDp86IdQsN/xWjIEmr9MF6o9mpksUgh0fu+9ByFxzIU=
 github.com/mattn/go-sqlite3 v1.14.8/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
-github.com/mediocregopher/mediocre-go-lib/v2 v2.0.0-beta.0 h1:i9FBkcCaWXxteJ8458AD8dBL2YqSxVlpsHOMWg5N9Dc=
-github.com/mediocregopher/mediocre-go-lib/v2 v2.0.0-beta.0/go.mod h1:wOZVlnKYvIbkzyCJ3dxy1k40XkirvCd1pisX2O91qoQ=
 github.com/mediocregopher/mediocre-go-lib/v2 v2.0.0-beta.0.0.20220506011745-cbeee71cb1ee h1:AWRuhgn7iumyhPuxKwed1F1Ri2dXMwxKfp5YIdpnQIY=
 github.com/mediocregopher/mediocre-go-lib/v2 v2.0.0-beta.0.0.20220506011745-cbeee71cb1ee/go.mod h1:wOZVlnKYvIbkzyCJ3dxy1k40XkirvCd1pisX2O91qoQ=
 github.com/mediocregopher/radix/v4 v4.0.0-beta.1.0.20210726230805-d62fa1b2e3cb h1:7Y2vAC5q44VJzbBUdxRUEqfz88ySJ/6yXXkpQ+sxke4=
@@ -181,7 +181,6 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20190325154230-a5d413f7728c/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191122220453-ac88ee75c92c/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a h1:vclmkQCjlDX5OydZ9wv8rBCcS0QyQY66Mpf/7BZbInM=
 golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 h1:HWj/xjIHfjYU5nVXpTM0s39J9CbLn7Cc5a7IC5rwsMQ=
 golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
@@ -209,12 +208,14 @@ golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 h1:SrN+KX8Art/Sf4HNj6Zcz06G7VEz+7w9tdXTPOZ7+l4=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e h1:fLOSk5Q00efkSvAm+4xcoXD+RRmLmmulPn5I3Y9F2EM=
+golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
diff --git a/srv/src/post/post.go b/srv/src/post/post.go
index bdc48af..5835995 100644
--- a/srv/src/post/post.go
+++ b/srv/src/post/post.go
@@ -5,7 +5,6 @@ import (
 	"database/sql"
 	"errors"
 	"fmt"
-	"path"
 	"regexp"
 	"strings"
 	"time"
@@ -37,6 +36,12 @@ type Post struct {
 	Body        string
 }
 
+// HTTPPath returns the relative URL path of the StoredPost, when querying it
+// over HTTP.
+func (p Post) HTTPPath() string {
+	return fmt.Sprintf("%s.html", p.ID)
+}
+
 // StoredPost is a Post which has been stored in a Store, and has been given
 // some extra fields as a result.
 type StoredPost struct {
@@ -46,19 +51,6 @@ type StoredPost struct {
 	LastUpdatedAt time.Time
 }
 
-// URL returns the relative URL of the StoredPost.
-func (p StoredPost) URL() string {
-	return path.Join(
-		fmt.Sprintf(
-			"%d/%0d/%0d",
-			p.PublishedAt.Year(),
-			p.PublishedAt.Month(),
-			p.PublishedAt.Day(),
-		),
-		p.ID+".html",
-	)
-}
-
 // Store is used for storing posts to a persistent storage.
 type Store interface {
 
diff --git a/srv/src/post/renderer.go b/srv/src/post/renderer.go
new file mode 100644
index 0000000..74acc25
--- /dev/null
+++ b/srv/src/post/renderer.go
@@ -0,0 +1,96 @@
+package post
+
+import (
+	_ "embed"
+	"fmt"
+	"html/template"
+	"io"
+
+	"github.com/gomarkdown/markdown"
+	"github.com/gomarkdown/markdown/html"
+	"github.com/gomarkdown/markdown/parser"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/tpl"
+)
+
+// RenderablePost is a Post wrapped with extra information necessary for
+// rendering.
+type RenderablePost struct {
+	StoredPost
+	SeriesPrevious, SeriesNext *StoredPost
+}
+
+// NewRenderablePost wraps an existing Post such that it can be rendered.
+func NewRenderablePost(store Store, post StoredPost) (RenderablePost, error) {
+
+	renderablePost := RenderablePost{
+		StoredPost: post,
+	}
+
+	if post.Series != "" {
+
+		seriesPosts, err := store.GetBySeries(post.Series)
+		if err != nil {
+			return RenderablePost{}, fmt.Errorf(
+				"fetching posts for series %q: %w",
+				post.Series, err,
+			)
+		}
+
+		var foundThis bool
+
+		for i := range seriesPosts {
+
+			seriesPost := seriesPosts[i]
+
+			if seriesPost.ID == post.ID {
+				foundThis = true
+				continue
+			}
+
+			if !foundThis {
+				renderablePost.SeriesPrevious = &seriesPost
+				continue
+			}
+
+			renderablePost.SeriesNext = &seriesPost
+			break
+		}
+	}
+
+	return renderablePost, nil
+}
+
+// Renderer takes a Post and renders it to some encoding.
+type Renderer interface {
+	Render(io.Writer, RenderablePost) error
+}
+
+func mdBodyToHTML(body []byte) []byte {
+	parserExt := parser.CommonExtensions | parser.AutoHeadingIDs
+	parser := parser.NewWithExtensions(parserExt)
+
+	htmlFlags := html.CommonFlags | html.HrefTargetBlank
+	htmlRenderer := html.NewRenderer(html.RendererOptions{Flags: htmlFlags})
+
+	return markdown.ToHTML(body, parser, htmlRenderer)
+}
+
+type mdHTMLRenderer struct{}
+
+// NewMarkdownToHTMLRenderer renders Posts from markdown to HTML.
+func NewMarkdownToHTMLRenderer() Renderer {
+	return mdHTMLRenderer{}
+}
+
+func (r mdHTMLRenderer) Render(into io.Writer, post RenderablePost) error {
+
+	data := struct {
+		RenderablePost
+		Body template.HTML
+	}{
+		RenderablePost: post,
+		Body:           template.HTML(mdBodyToHTML([]byte(post.Body))),
+	}
+
+	return tpl.HTML.ExecuteTemplate(into, "post.html", data)
+}
diff --git a/srv/src/post/renderer_test.go b/srv/src/post/renderer_test.go
new file mode 100644
index 0000000..5c01cd2
--- /dev/null
+++ b/srv/src/post/renderer_test.go
@@ -0,0 +1,92 @@
+package post
+
+import (
+	"bytes"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMarkdownBodyToHTML(t *testing.T) {
+
+	tests := []struct {
+		body string
+		exp  string
+	}{
+		{
+			body: `
+# Foo
+`,
+			exp: `<h1 id="foo">Foo</h1>`,
+		},
+		{
+			body: `
+this is a body
+
+this is another
+`,
+			exp: `
+<p>this is a body</p>
+
+<p>this is another</p>`,
+		},
+		{
+			body: `this is a [link](somewhere.html)`,
+			exp:  `<p>this is a <a href="somewhere.html" target="_blank">link</a></p>`,
+		},
+	}
+
+	for i, test := range tests {
+		t.Run(strconv.Itoa(i), func(t *testing.T) {
+
+			outB := mdBodyToHTML([]byte(test.body))
+			out := string(outB)
+
+			// just to make the tests nicer
+			out = strings.TrimSpace(out)
+			test.exp = strings.TrimSpace(test.exp)
+
+			assert.Equal(t, test.exp, out)
+		})
+	}
+}
+
+func TestMarkdownToHTMLRenderer(t *testing.T) {
+
+	r := NewMarkdownToHTMLRenderer()
+
+	post := RenderablePost{
+		StoredPost: StoredPost{
+			Post: Post{
+				ID:          "foo",
+				Title:       "Foo",
+				Description: "Bar.",
+				Body:        "This is the body.",
+				Series:      "baz",
+			},
+			PublishedAt: time.Now(),
+		},
+
+		SeriesPrevious: &StoredPost{
+			Post: Post{
+				ID:    "foo-prev",
+				Title: "Foo Prev",
+			},
+		},
+
+		SeriesNext: &StoredPost{
+			Post: Post{
+				ID:    "foo-next",
+				Title: "Foo Next",
+			},
+		},
+	}
+
+	buf := new(bytes.Buffer)
+	err := r.Render(buf, post)
+	assert.NoError(t, err)
+	t.Log(buf.String())
+}
diff --git a/srv/src/tpl/html/base.html b/srv/src/tpl/html/base.html
new file mode 100644
index 0000000..bf81032
--- /dev/null
+++ b/srv/src/tpl/html/base.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html lang="en">
+
+  <head>
+    <meta charset="utf-8">
+    <link rel="stylesheet" href="/assets/normalize.css">
+    <link rel="stylesheet" href="/assets/skeleton.css">
+    <link rel="stylesheet" href="/assets/friendly.css">
+    <link rel="stylesheet" href="/assets/main.css">
+    <link rel="stylesheet" href="/assets/fontawesome/css/all.css">
+  </head>
+
+  <body>
+
+    <div class="container">
+
+      <header id="title-header" role="banner">
+        <div class="row">
+          <div class="seven columns" style="margin-bottom: 3rem;">
+            <h1 class="title">
+              <a href="/">Mediocre Blog</a>
+            </h1>
+            <div class="light social">
+              <span>By Brian Picciano</span>
+              <span>
+                Even more @
+                <a href="https://mediocregopher.eth.link" target="_blank">https://mediocregopher.eth.link</a>
+              </span>
+            </div>
+          </div>
+
+          <div class="five columns light">
+            <span style="display:block; margin-bottom:0.5rem;">Get notified when new posts are published!</span>
+            <a href="/follow.html">
+              <button class="button-primary">
+                <i class="far fa-envelope"></i>
+                Follow
+              </button>
+            </a>
+            <a href="/feed.xml">
+              <button class="button">
+                <i class="fas fa-rss"></i>
+                RSS
+              </button>
+            </a>
+          </div>
+
+        </div>
+      </header>
+
+      {{ template "body" . }}
+
+      <footer>
+        <p class="license light">
+        Unless otherwised specified, all works are licensed under the
+        <a href="/assets/wtfpl.txt">WTFPL</a>.
+        </p>
+      </footer>
+
+    </div>
+
+  </body>
+
+</html>
+
diff --git a/srv/src/tpl/html/post.html b/srv/src/tpl/html/post.html
new file mode 100644
index 0000000..22a5b97
--- /dev/null
+++ b/srv/src/tpl/html/post.html
@@ -0,0 +1,48 @@
+{{ define "body" }}
+
+<header id="post-header">
+  <h1 id="post-headline">
+    {{ .Title }}
+  </h1>
+  <div class="light">
+    {{ .PublishedAt.Format "2006-01-02" }}
+    &nbsp;•&nbsp;
+    {{ if not .LastUpdatedAt.IsZero }}
+    (Updated {{ .LastUpdatedAt.Format "2006-01-02" }})
+    &nbsp;•&nbsp;
+    {{ end }}
+    <em>{{ .Description }}</em>
+  </div>
+</header>
+
+{{ if (or .SeriesPrevious .SeriesNext) }}
+<p class="light"><em>
+  This post is part of a series:<br/>
+  {{ if .SeriesPrevious }}
+  Previously: <a href="{{ .SeriesPrevious.HTTPPath }}">{{ .SeriesPrevious.Title }}</a></br>
+  {{ end }}
+  {{ if .SeriesNext }}
+  Next: <a href="{{ .SeriesNext.HTTPPath }}">{{ .SeriesNext.Title }}</a></br>
+  {{ end }}
+</em></p>
+{{ end }}
+
+<div id="post-content">
+  {{ .Body }}
+</div>
+
+{{ if (or .SeriesPrevious .SeriesNext) }}
+<p class="light"><em>
+  If you liked this post, consider checking out other posts in the series:<br/>
+  {{ if .SeriesPrevious }}
+  Previously: <a href="{{ .SeriesPrevious.HTTPPath }}">{{ .SeriesPrevious.Title }}</a></br>
+  {{ end }}
+  {{ if .SeriesNext }}
+  Next: <a href="{{ .SeriesNext.HTTPPath }}">{{ .SeriesNext.Title }}</a></br>
+  {{ end }}
+</em></p>
+{{ end }}
+
+{{ end }}
+
+{{ template "base.html" . }}
diff --git a/srv/src/tpl/tpl.go b/srv/src/tpl/tpl.go
new file mode 100644
index 0000000..1dd98ba
--- /dev/null
+++ b/srv/src/tpl/tpl.go
@@ -0,0 +1,12 @@
+// Package tpl contains template files which are used to render the blog.
+package tpl
+
+import (
+	"embed"
+	html_tpl "html/template"
+)
+
+//go:embed *
+var fs embed.FS
+
+var HTML = html_tpl.Must(html_tpl.ParseFS(fs, "html/*"))