From e85a6b1c934d1070e40d11ad94b3ad4d79bdc9b2 Mon Sep 17 00:00:00 2001
From: Feuerfuchs <git@feuerfuchs.dev>
Date: Sun, 17 Nov 2019 10:14:58 +0100
Subject: Report template errors, add support for start page

---
 cmd/gopherproxy/main.go |   3 +-
 gopherproxy.go          |  97 ++++++++++++++------
 startpage.txt           |   1 +
 template.go             | 229 ++++++++++++++++++++++++------------------------
 4 files changed, 187 insertions(+), 143 deletions(-)
 create mode 100644 startpage.txt

diff --git a/cmd/gopherproxy/main.go b/cmd/gopherproxy/main.go
index 66248ac..e84e978 100644
--- a/cmd/gopherproxy/main.go
+++ b/cmd/gopherproxy/main.go
@@ -13,7 +13,6 @@ var (
 	bind            = flag.String("bind", "0.0.0.0:8000", "[int]:port to bind to")
 	robotsfile      = flag.String("robots-file", "robots.txt", "robots.txt file")
 	robotsdebug     = flag.Bool("robots-debug", false, "print output about ignored robots.txt")
-	uri             = flag.String("uri", "gopher/floodgap.com", "<gopher|gemini>/<host>:[port] to proxy to")
 	vipsconcurrency = flag.Int("vips-concurrency", 1, "Concurrency level of libvips")
 )
 
@@ -21,5 +20,5 @@ func main() {
 	flag.Parse()
 
 	// Use a config struct
-	log.Fatal(gopherproxy.ListenAndServe(*bind, *robotsfile, *robotsdebug, *vipsconcurrency, *uri))
+	log.Fatal(gopherproxy.ListenAndServe(*bind, *robotsfile, *robotsdebug, *vipsconcurrency))
 }
diff --git a/gopherproxy.go b/gopherproxy.go
index 751cebf..2a6358c 100644
--- a/gopherproxy.go
+++ b/gopherproxy.go
@@ -177,9 +177,19 @@ func parseGeminiDocument(body *bytes.Buffer, uri string, hostport string) (items
 	return
 }
 
-func DefaultHandler(tpl *template.Template, uri string) http.HandlerFunc {
+func DefaultHandler(tpl *template.Template, startpagetext string, assetList AssetList) http.HandlerFunc {
 	return func(w http.ResponseWriter, req *http.Request) {
-		http.Redirect(w, req, "/"+uri, http.StatusFound)
+		if err := tpl.Execute(w, struct {
+			Title    string
+			URI      string
+			Assets   AssetList
+			RawText  string
+			Lines    []Item
+			Error    bool
+			Protocol string
+		}{"Gopher/Gemini proxy", "", assetList, startpagetext, nil, false, "startpage"}); err != nil {
+			log.Println("Template error: " + err.Error())
+		}
 	}
 }
 
@@ -188,7 +198,7 @@ func DefaultHandler(tpl *template.Template, uri string) http.HandlerFunc {
 // to the request path and renders the content using the provided template.
 // The optional robots parameters points to a robotstxt.RobotsData struct
 // to test user agents against a configurable robotst.txt file.
-func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, assetList AssetList, robotsdebug bool, uri string) http.HandlerFunc {
+func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, assetList AssetList, robotsdebug bool) http.HandlerFunc {
 	return func(w http.ResponseWriter, req *http.Request) {
 		agent := req.UserAgent()
 		path := strings.TrimPrefix(req.URL.Path, "/gopher/")
@@ -201,7 +211,7 @@ func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 		hostport := parts[0]
 
 		if len(hostport) == 0 {
-			http.Redirect(w, req, "/"+uri, http.StatusFound)
+			http.Redirect(w, req, "/", http.StatusFound)
 			return
 		}
 
@@ -215,7 +225,7 @@ func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 
 		uri, err := url.QueryUnescape(strings.Join(parts[1:], "/"))
 		if err != nil {
-			tpl.Execute(w, struct {
+			if e := tpl.Execute(w, struct {
 				Title    string
 				URI      string
 				Assets   AssetList
@@ -223,7 +233,10 @@ func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 				Lines    []Item
 				Error    bool
 				Protocol string
-			}{title, hostport, assetList, fmt.Sprintf("Error: %s", err), nil, true, "gopher"})
+			}{title, hostport, assetList, fmt.Sprintf("Error: %s", err), nil, true, "gopher"}); e != nil {
+				log.Println("Template error: " + e.Error())
+				log.Println(err.Error())
+			}
 			return
 		}
 
@@ -241,7 +254,7 @@ func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 		)
 
 		if err != nil {
-			tpl.Execute(w, struct {
+			if e := tpl.Execute(w, struct {
 				Title    string
 				URI      string
 				Assets   AssetList
@@ -249,7 +262,9 @@ func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 				Lines    []Item
 				Error    bool
 				Protocol string
-			}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error: %s", err), nil, true, "gopher"})
+			}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error: %s", err), nil, true, "gopher"}); e != nil {
+				log.Println("Template error: " + e.Error())
+			}
 			return
 		}
 
@@ -259,7 +274,7 @@ func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 			} else if strings.HasPrefix(parts[1], "0") && !strings.HasSuffix(uri, ".xml") && !strings.HasSuffix(uri, ".asc") {
 				buf := new(bytes.Buffer)
 				buf.ReadFrom(res.Body)
-				tpl.Execute(w, struct {
+				if err := tpl.Execute(w, struct {
 					Title    string
 					URI      string
 					Assets   AssetList
@@ -267,7 +282,9 @@ func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 					Lines    []Item
 					Error    bool
 					Protocol string
-				}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, buf.String(), nil, false, "gopher"})
+				}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, buf.String(), nil, false, "gopher"}); err != nil {
+					log.Println("Template error: " + err.Error())
+				}
 			} else if strings.HasPrefix(parts[1], "T") {
 				_, _, err = vips.NewTransform().
 					Load(res.Body).
@@ -281,7 +298,7 @@ func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 			}
 		} else {
 			if err := renderGopherDirectory(w, tpl, assetList, uri, hostport, res.Dir); err != nil {
-				tpl.Execute(w, struct {
+				if e := tpl.Execute(w, struct {
 					Title    string
 					URI      string
 					Assets   AssetList
@@ -289,13 +306,16 @@ func GopherHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 					Lines    []Item
 					Error    bool
 					Protocol string
-				}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error: %s", err), nil, true, "gopher"})
+				}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error: %s", err), nil, true, "gopher"}); e != nil {
+					log.Println("Template error: " + e.Error())
+					log.Println(e.Error())
+				}
 			}
 		}
 	}
 }
 
-func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, assetList AssetList, robotsdebug bool, uri string) http.HandlerFunc {
+func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, assetList AssetList, robotsdebug bool) http.HandlerFunc {
 	return func(w http.ResponseWriter, req *http.Request) {
 		agent := req.UserAgent()
 		path := strings.TrimPrefix(req.URL.Path, "/gemini/")
@@ -308,7 +328,7 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 		hostport := parts[0]
 
 		if len(hostport) == 0 {
-			http.Redirect(w, req, "/"+uri, http.StatusFound)
+			http.Redirect(w, req, "/", http.StatusFound)
 			return
 		}
 
@@ -322,7 +342,7 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 
 		uri, err := url.QueryUnescape(strings.Join(parts[1:], "/"))
 		if err != nil {
-			tpl.Execute(w, struct {
+			if e := tpl.Execute(w, struct {
 				Title    string
 				URI      string
 				Assets   AssetList
@@ -330,7 +350,10 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 				Lines    []Item
 				Error    bool
 				Protocol string
-			}{title, hostport, assetList, fmt.Sprintf("Error: %s", err), nil, true, "gemini"})
+			}{title, hostport, assetList, fmt.Sprintf("Error: %s", err), nil, true, "gemini"}); e != nil {
+				log.Println("Template error: " + e.Error())
+				log.Println(err.Error())
+			}
 			return
 		}
 
@@ -348,7 +371,7 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 		)
 
 		if err != nil {
-			tpl.Execute(w, struct {
+			if e := tpl.Execute(w, struct {
 				Title    string
 				URI      string
 				Assets   AssetList
@@ -356,7 +379,10 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 				Lines    []Item
 				Error    bool
 				Protocol string
-			}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error: %s", err), nil, true, "gemini"})
+			}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error: %s", err), nil, true, "gemini"}); e != nil {
+				log.Println("Template error: " + e.Error())
+				log.Println(err.Error())
+			}
 			return
 		}
 
@@ -367,7 +393,7 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 				uri,
 			))
 			if err != nil {
-				tpl.Execute(w, struct {
+				if e := tpl.Execute(w, struct {
 					Title    string
 					URI      string
 					Assets   AssetList
@@ -375,7 +401,10 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 					Lines    []Item
 					Error    bool
 					Protocol string
-				}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error: %s", err), nil, true, "gemini"})
+				}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error: %s", err), nil, true, "gemini"}); e != nil {
+					log.Println("Template error: " + e.Error())
+					log.Println(err.Error())
+				}
 				return
 			}
 
@@ -384,7 +413,7 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 		}
 
 		if int(res.Header.Status/10) != 2 {
-			tpl.Execute(w, struct {
+			if err := tpl.Execute(w, struct {
 				Title    string
 				URI      string
 				Assets   AssetList
@@ -392,7 +421,9 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 				Lines    []Item
 				Error    bool
 				Protocol string
-			}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error %d: %s", res.Header.Status, res.Header.Meta), nil, true, "gemini"})
+			}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, fmt.Sprintf("Error %d: %s", res.Header.Status, res.Header.Meta), nil, true, "gemini"}); err != nil {
+				log.Println("Template error: " + err.Error())
+			}
 			return
 		}
 
@@ -423,7 +454,7 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 				rawText = buf.String()
 			}
 
-			tpl.Execute(w, struct {
+			if err := tpl.Execute(w, struct {
 				Title    string
 				URI      string
 				Assets   AssetList
@@ -431,7 +462,9 @@ func GeminiHandler(tpl *template.Template, robotsdata *robotstxt.RobotsData, ass
 				Lines    []Item
 				Error    bool
 				Protocol string
-			}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, rawText, items, false, "gemini"})
+			}{title, fmt.Sprintf("%s/%s", hostport, uri), assetList, rawText, items, false, "gemini"}); err != nil {
+				log.Println("Template error: " + err.Error())
+			}
 		} else {
 			io.Copy(w, res.Body)
 		}
@@ -506,7 +539,7 @@ func FontHandler(woff2 bool, fontdata []byte) http.HandlerFunc {
 // specified by the request. The robots argument is a pointer to
 // a robotstxt.RobotsData struct for testing user agents against
 // a configurable robots.txt file.
-func ListenAndServe(bind, robotsfile string, robotsdebug bool, vipsconcurrency int, uri string) error {
+func ListenAndServe(bind, robotsfile string, robotsdebug bool, vipsconcurrency int) error {
 	var (
 		tpl        *template.Template
 		robotsdata *robotstxt.RobotsData
@@ -567,6 +600,12 @@ func ListenAndServe(bind, robotsfile string, robotsdebug bool, vipsconcurrency i
 		favicondata = []byte{}
 	}
 
+	startpagedata, err := ioutil.ReadFile("startpage.txt")
+	if err != nil {
+		startpagedata = []byte{}
+	}
+	startpagetext := string(startpagedata)
+
 	tpldata, err := ioutil.ReadFile(".template")
 	if err == nil {
 		tpltext = string(tpldata)
@@ -622,9 +661,11 @@ func ListenAndServe(bind, robotsfile string, robotsdebug bool, vipsconcurrency i
 		ConcurrencyLevel: vipsconcurrency,
 	})
 
-	http.Handle("/", gziphandler.GzipHandler(DefaultHandler(tpl, uri)))
-	http.Handle("/gopher/", gziphandler.GzipHandler(GopherHandler(tpl, robotsdata, AssetList{styleAsset, jsAsset, fontwAsset, fontw2Asset, propfontwAsset, propfontw2Asset}, robotsdebug, uri)))
-	http.Handle("/gemini/", gziphandler.GzipHandler(GeminiHandler(tpl, robotsdata, AssetList{styleAsset, jsAsset, fontwAsset, fontw2Asset, propfontwAsset, propfontw2Asset}, robotsdebug, uri)))
+	assets := AssetList{styleAsset, jsAsset, fontwAsset, fontw2Asset, propfontwAsset, propfontw2Asset}
+
+	http.Handle("/", gziphandler.GzipHandler(DefaultHandler(tpl, startpagetext, assets)))
+	http.Handle("/gopher/", gziphandler.GzipHandler(GopherHandler(tpl, robotsdata, assets, robotsdebug)))
+	http.Handle("/gemini/", gziphandler.GzipHandler(GeminiHandler(tpl, robotsdata, assets, robotsdebug)))
 	http.Handle("/robots.txt", gziphandler.GzipHandler(RobotsTxtHandler(robotstxtdata)))
 	http.Handle("/favicon.ico", gziphandler.GzipHandler(FaviconHandler(favicondata)))
 	http.Handle(styleAsset, gziphandler.GzipHandler(StyleHandler(styledata)))
diff --git a/startpage.txt b/startpage.txt
new file mode 100644
index 0000000..b411de6
--- /dev/null
+++ b/startpage.txt
@@ -0,0 +1 @@
+>>>> Gopher/Gemini proxy <<<<
diff --git a/template.go b/template.go
index 3bd8950..7ddc460 100644
--- a/template.go
+++ b/template.go
@@ -2,118 +2,121 @@ package gopherproxy
 
 var tpltext = `<!doctype html>
 <html>
-  <head>
-    <meta charset="utf-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <title>{{ .Title }} - {{ .Protocol | title }} proxy</title>
-    <link rel="stylesheet" href="{{ .Assets.Style }}" />
-    <style>
-      @font-face {
-        font-family: 'Iosevka Term SS03';
-        font-style:  normal;
-        font-weight: normal;
-        src: url('{{ .Assets.FontW2 }}') format('woff2'),
-            url('{{ .Assets.FontW }}')  format('woff');
-      }
-      @font-face {
-        font-family: 'Iosevka Aile';
-        font-style:  normal;
-        font-weight: normal;
-        src: url('{{ .Assets.PropFontW2 }}') format('woff2'),
-            url('{{ .Assets.PropFontW }}')  format('woff');
-      }
-    </style>
-  </head>
-  <body class="{{ if not .Lines }}is-plain{{ end }}">
-    <header class="header header-base">
-      <div class="location">
-        {{- $page     := . -}}
-        {{- $href     := "" -}}
-        {{- $uriParts := split .URI "/" -}}
-        {{- $uriLast  := $uriParts | last -}}
-        {{- $uriParts  = $uriParts | pop -}}
-        {{- if eq $uriLast "" -}}
-          {{- $uriLast  = $uriParts | last -}}
-          {{- $uriParts = $uriParts | pop -}}
-        {{- end -}}
+	<head>
+		<meta charset="utf-8">
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		<title>{{ .Title }} - {{ .Protocol | title }} proxy</title>
+		<link rel="stylesheet" href="{{ .Assets.Style }}" />
+		<style>
+			@font-face {
+				font-family: 'Iosevka Term SS03';
+				font-style:  normal;
+				font-weight: normal;
+				src: url('{{ .Assets.FontW2 }}') format('woff2'),
+						url('{{ .Assets.FontW }}')  format('woff');
+			}
+			@font-face {
+				font-family: 'Iosevka Aile';
+				font-style:  normal;
+				font-weight: normal;
+				src: url('{{ .Assets.PropFontW2 }}') format('woff2'),
+						url('{{ .Assets.PropFontW }}')  format('woff');
+			}
+		</style>
+	</head>
+	<body class="{{ if not .Lines }}is-plain{{ end }}">
+		<header class="header header-base">
+			<div class="location">
+                <a class="location__prefix">{{ .Protocol }}://</a><a class="location__prefix location__prefix--mobile">://</a>
+                
+				{{- if .URI -}}
+				    {{- $page     := . -}}
+                    {{- $href     := printf "/%s" .Protocol -}}
+                    {{- $uriParts := split .URI "/" -}}
+                
+					{{- $uriLast  := $uriParts | last -}}
+					{{- $uriParts  = $uriParts | pop -}}
+					{{- if eq $uriLast "" -}}
+						{{- $uriLast  = $uriParts | last -}}
+						{{- $uriParts = $uriParts | pop -}}
+					{{- end -}}
 
-        <a class="location__prefix">{{ .Protocol }}://</a><a class="location__prefix location__prefix--mobile">://</a>
-        {{- $href = printf "%s/%s" $href .Protocol -}}
-        {{- range $i, $part := $uriParts -}}
-          {{- if and (eq $page.Protocol "gopher") (eq $i 1) -}}
-            {{- $href = printf "%s/1" $href -}}
-            {{- $part = $part | trimLeftChar -}}
-            {{- if not (eq $part "") -}}
-              {{- $href = printf "%s/%s" $href $part -}}
-              <span class="location__slash">/</span><a href="{{ $href }}/" class="location__uripart">{{ $part }}</a>
-            {{- end -}}
-          {{- else -}}
-            {{- $href = printf "%s/%s" $href . -}}
-            {{- if ne $i 0 -}}
-              <span class="location__slash">/</span>
-            {{- end -}}
-            <a href="{{ $href }}/" class="location__uripart">{{ . }}</a>
-          {{- end -}}
-        {{- end -}}
-        {{- if ne (len $uriParts) 0 -}}
-          <span class="location__slash">/</span>
-        {{- end -}}
-        {{- if and (eq $page.Protocol "gopher") (eq (len $uriParts) 1) -}}
-          {{- $uriLast = $uriLast | trimLeftChar -}}
-        {{- end -}}
-        <span class="location__uripart">{{ $uriLast }}</span>
-      </div>
-      <div class="actions">
-        {{- if and (not .Lines) (not .Error) (eq .Protocol "gopher") -}}
-          <div class="action"><a href="/{{ .URI | replace "^(.*?)/0" "$1/9" }}">View raw</a></div>
-        {{- end -}}
-        <div class="action"><button class="settings-btn">Settings</button></div>
-      </div>
-    </header>
-    <main class="wrap">
-      <pre class="content content--has-monospace-font{{ if .Lines }} content--has-type-annotations{{ end }}">
-        {{- if .Lines -}}
-          {{- $content := "" -}}
-          {{- range .Lines -}}
-            {{- if ne $content "" -}}
-              {{- $content = printf "%s\n" $content -}}
-            {{- end -}}
-            {{- if .Link -}}
-              {{- $content = printf "%s%s" $content (printf "<span class=\"type-annotation\">%s  </span><a class=\"link link--%s\" href=\"%s\">%s</a>" .Type .Type .Link (.Text | HTMLEscape)) -}}
-            {{- else -}}
-              {{- $content = printf "%s%s" $content (printf "<span class=\"type-annotation\">     </span>%s" (.Text | HTMLEscape)) -}}
-            {{- end -}}
-          {{- end -}}
-          {{- $content | safeHtml -}}
-        {{- else -}}
-          {{- .RawText -}}
-        {{- end -}}
-      </pre>
-    </main>
-    <aside class="modal modal--settings">
-      <div class="modal__content">
-        <header class="modal__head header-base">
-          <h1 class="modal__title">Settings</h1>
-          <button class="modal__close-btn">Close</button>
-        </header>
-        <div class="setting setting--word-wrap">
-          <strong class="setting__label">Wrap wide content</strong>
-          <button class="setting__value">[N/A]</button>
-        </div>
-        <div class="setting setting--monospace-font">
-          <strong class="setting__label">Monospace font</strong>
-          <button class="setting__value">[N/A]</button>
-        </div>
-        <div class="setting setting--image-previews">
-          <strong class="setting__label">Image thumbnails</strong>
-          <button class="setting__value">[N/A]</button>
-        </div>
-        <div class="setting setting--clickable-plain-links">
-          <strong class="setting__label">Clickable links in text files</strong>
-          <button class="setting__value">[N/A]</button>
-        </div>
-      </div>
-    </aside>
-    <script src="{{ .Assets.JS }}"></script>
-  </body>
+					{{- range $i, $part := $uriParts -}}
+						{{- if and (eq $page.Protocol "gopher") (eq $i 1) -}}
+							{{- $href = printf "%s/1" $href -}}
+							{{- $part = $part | trimLeftChar -}}
+							{{- if not (eq $part "") -}}
+								{{- $href = printf "%s/%s" $href $part -}}
+								<span class="location__slash">/</span><a href="{{ $href }}/" class="location__uripart">{{ $part }}</a>
+							{{- end -}}
+						{{- else -}}
+							{{- $href = printf "%s/%s" $href . -}}
+							{{- if ne $i 0 -}}
+								<span class="location__slash">/</span>
+							{{- end -}}
+							<a href="{{ $href }}/" class="location__uripart">{{ . }}</a>
+						{{- end -}}
+					{{- end -}}
+					{{- if ne (len $uriParts) 0 -}}
+						<span class="location__slash">/</span>
+					{{- end -}}
+					{{- if and (eq $page.Protocol "gopher") (eq (len $uriParts) 1) -}}
+						{{- $uriLast = $uriLast | trimLeftChar -}}
+					{{- end -}}
+					<span class="location__uripart">{{ $uriLast }}</span>
+                {{- end -}}
+			</div>
+			<div class="actions">
+				{{- if and (not .Lines) (not .Error) (eq .Protocol "gopher") -}}
+					<div class="action"><a href="/{{ .URI | replace "^(.*?)/0" "$1/9" }}">View raw</a></div>
+				{{- end -}}
+				<div class="action"><button class="settings-btn">Settings</button></div>
+			</div>
+		</header>
+		<main class="wrap">
+			<pre class="content content--has-monospace-font{{ if .Lines }} content--has-type-annotations{{ end }}">
+				{{- if .Lines -}}
+					{{- $content := "" -}}
+					{{- range .Lines -}}
+						{{- if ne $content "" -}}
+							{{- $content = printf "%s\n" $content -}}
+						{{- end -}}
+						{{- if .Link -}}
+							{{- $content = printf "%s%s" $content (printf "<span class=\"type-annotation\">%s  </span><a class=\"link link--%s\" href=\"%s\">%s</a>" .Type .Type .Link (.Text | HTMLEscape)) -}}
+						{{- else -}}
+							{{- $content = printf "%s%s" $content (printf "<span class=\"type-annotation\">     </span>%s" (.Text | HTMLEscape)) -}}
+						{{- end -}}
+					{{- end -}}
+					{{- $content | safeHtml -}}
+				{{- else -}}
+					{{- .RawText -}}
+				{{- end -}}
+			</pre>
+		</main>
+		<aside class="modal modal--settings">
+			<div class="modal__content">
+				<header class="modal__head header-base">
+					<h1 class="modal__title">Settings</h1>
+					<button class="modal__close-btn">Close</button>
+				</header>
+				<div class="setting setting--word-wrap">
+					<strong class="setting__label">Wrap wide content</strong>
+					<button class="setting__value">[N/A]</button>
+				</div>
+				<div class="setting setting--monospace-font">
+					<strong class="setting__label">Monospace font</strong>
+					<button class="setting__value">[N/A]</button>
+				</div>
+				<div class="setting setting--image-previews">
+					<strong class="setting__label">Image thumbnails</strong>
+					<button class="setting__value">[N/A]</button>
+				</div>
+				<div class="setting setting--clickable-plain-links">
+					<strong class="setting__label">Clickable links in text files</strong>
+					<button class="setting__value">[N/A]</button>
+				</div>
+			</div>
+		</aside>
+		<script src="{{ .Assets.JS }}"></script>
+	</body>
 </html>`
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