fix xml formatting

cmd/web/handlers.go

@@ -1,8 +1,7 @@
 package main
 
 import (
-	"fmt"
-	"html"
+	// "html"
 	"net/http"
 	"strings"
 
@@ -15,7 +14,7 @@ func (app *application) home(w http.ResponseWriter, r *http.Request) {
         return
     }
 
-    app.render(w, http.StatusOK, "home.tmpl.html", nil)
+    app.renderPage(w, http.StatusOK, "home.tmpl.html", nil)
 }
 
 func (app *application) generateRss(w http.ResponseWriter, r *http.Request) {
@@ -29,12 +28,14 @@ func (app *application) generateRss(w http.ResponseWriter, r *http.Request) {
         pages[i] = strings.TrimSpace(pages[i])
     }
 
-    feed, err := feed.GenerateRss(siteUrl, siteName, siteDesc, pages...)
+    feedInfo, err := feed.NewFeedInfo(siteName, siteUrl, siteDesc, "", pages...)
     if err != nil {
-        w.Write([]byte(fmt.Sprintf("<p class=\"error\">Error generating feed: %s</p>", err.Error())))
-        app.infoLog.Printf("Error generating feed: %s\n", err.Error())
-    }
-    for _, line := range strings.Split(feed, "\n") {
-        w.Write([]byte(html.EscapeString(line) + "\n"))
+        app.errorLog.Printf("Error generating feed: %s\n", err.Error())
+        return
     }
+
+    feed := feedInfo.GenerateRSS()
+    data := newTemplateData(r)
+    data.Feeds = append(data.Feeds, feed)
+    app.renderElem(w, http.StatusOK, "feed-output.tmpl.html", data)
 }

cmd/web/helpers.go

@@ -32,7 +32,7 @@ func (app *application) cleanUrl(url string) string {
     return s
 }
 
-func (app *application) render(w http.ResponseWriter, status int, page string, data *templateData) {
+func (app *application) renderPage(w http.ResponseWriter, status int, page string, data *templateData) {
     ts, ok := app.templateCache[page]
     if !ok {
         err := fmt.Errorf("the template %s does not exist", page)
@@ -54,3 +54,26 @@ func (app *application) render(w http.ResponseWriter, status int, page string, d
 
     buf.WriteTo(w)
 }
+
+func (app *application) renderElem(w http.ResponseWriter, status int, elem string, data *templateData) {
+    ts, ok := app.templateCache[elem]
+    if !ok {
+        err := fmt.Errorf("the template %s does not exist", elem)
+        app.serverError(w, err)
+        return
+    }
+
+    // a buffer to attempt to write the template to
+    // before writing it to the ResponseWriter w
+    buf := new(bytes.Buffer)
+
+    err := ts.Execute(buf, data)
+    if err != nil {
+        app.serverError(w, err)
+        return
+    }
+
+    w.WriteHeader(status)
+
+    buf.WriteTo(w)
+}

cmd/web/templates.go

@@ -1,11 +1,15 @@
 package main
 
 import (
+	"net/http"
 	"path/filepath"
 	"text/template"
+	"time"
 )
 
 type templateData struct {
+    CurrentYear int
+    Feeds       []string
 }
 
 func newTemplateCache() (map[string]*template.Template, error) {
@@ -15,7 +19,6 @@ func newTemplateCache() (map[string]*template.Template, error) {
     if err != nil {
         return nil, err
     }
-
     for _, page := range pages {
         name := filepath.Base(page)
 
@@ -39,5 +42,27 @@ func newTemplateCache() (map[string]*template.Template, error) {
         cache[name] = ts
     }
 
+    // htmx elements should just be raw html, so we parse those separately
+    hxElems, err := filepath.Glob("./ui/html/htmx/*.tmpl.html")
+    if err != nil {
+        return nil, err
+    }
+    for _, hxElem := range hxElems {
+        name := filepath.Base(hxElem)
+
+        ts, err := template.ParseFiles(hxElem)
+        if err != nil {
+            return nil, err
+        }
+
+        cache[name] = ts
+    }
+
     return cache, nil
 }
+
+func newTemplateData(r *http.Request) *templateData {
+    return &templateData{
+        CurrentYear: time.Now().Year(),
+    }
+}

feed/feed.go

@@ -10,15 +10,32 @@ import (
 	"golang.org/x/net/html"
 )
 
-type FeedBuilder interface {
-    GenerateFeed() string
-}
+const feedfmtopen = `<?xml version="1.0" encoding="utf-8"?>
+<rss version="2.0">
+<channel>
+<title>%s</title>
+<link>%s</link>
+<description>%s</description>`
+
+const feedfmtclose = `</channel>
+</rss>`
+
+const itemfmt = `<item>
+<title>%s</title>
+<link>%s</link>
+<guid>%s</guid>
+<pubDate>%s</pubDate>
+<description>
+%s
+</description>
+</item>`
 
 type FeedInfo struct {
     SiteName    string   
     SiteUrl     string
     SiteDesc    string
     PageUrls    []string
+    Items       []*FeedItem
     errors      map[string]error
 } 
 
@@ -26,7 +43,6 @@ type FeedItem struct {
     Url         string
     Title       string
     Author      string
-    EscapedText string
     PubTime     time.Time
     RawText     string
 }
@@ -97,9 +113,15 @@ func (f *FeedItem) ParseContent(content string) error {
     if err != nil {
         return err
     }
-    var builder strings.Builder
-    html.Render(&builder, earticle)
-    f.RawText = builder.String()
+    etitle, err := getHtmlElement(doc, "title")
+    if err != nil {
+        return err
+    }
+    f.Title = etitle.FirstChild.Data
+
+    var articleBuilder strings.Builder
+    html.Render(&articleBuilder, earticle)
+    f.RawText = articleBuilder.String()
 
     etime, err := getHtmlElement(earticle, "time")
     if err != nil {
@@ -133,37 +155,75 @@ func NewFeedItem(url string) (*FeedItem, error) {
     return &item, nil
 }
 
-// parseArticle returns an error if it could not parse the HTML or if it could not parse a time
-// if a time could not be parsed, the parsed html article will still be returned
-func parseArticle(content string) (string, *time.Time, error) {
-    doc, err := html.Parse(strings.NewReader(content))
+func NewFeedInfo(name, base_url, desc, author string, page_urls...string) (*FeedInfo, error) {
+    info := FeedInfo{
+        SiteName: name,
+        SiteUrl: base_url,
+        SiteDesc: desc,
+        PageUrls: page_urls,
+    }
+    for _,url := range info.PageUrls {
+        item, err := NewFeedItem(url)
         if err != nil {
-        return "", nil, fmt.Errorf("Error parsing HTML: %w", err)
+            info.errors[url] = err
+        } else {
+            info.Items = append(info.Items, item)
         }
-    var f func(*html.Node, string)
-    var element *html.Node
-    var pagetime time.Time
-    f = func(n *html.Node, tag string) {
-        if n.Type == html.ElementNode && n.Data == tag {
-            element = n
-            return
-        }
-        for c := n.FirstChild; c != nil; c = c.NextSibling {
-            f(c, tag)
     }
+    return &info, nil
 }
 
-    f(doc, "article")
-    var builder strings.Builder
-    html.Render(&builder, element)
-
-    f(element, "time")
-    for _, d := range element.Attr {
-        if d.Key == "datetime" {
-            pagetime, err = parseTime(d.Val)
+func (info *FeedInfo) format(raw string) string {
+    var formatBuilder strings.Builder
+    depth := 0
+    oldDepth := 0
+    for _,line := range strings.Split(raw, "\n") {
+        tmp := strings.TrimSpace(line)
+        if tmp == "" {
+            continue
+        }
+        oldDepth = depth
+        for i,s := range line {
+            if i < len(line) - 1 {
+                t := line[i + 1]
+                if s == '<' && t != '?' && t != '/' {
+                    depth += 1
+                }
+                if s == '<' && t == '/' {
+                    depth -= 1
+                }
+                if s == '/' && t == '>' {
+                    depth -= 1
                 }
             }
-
-    return builder.String(), &pagetime, nil 
+        }
+        for i := 0; i < depth; i++ {
+            if (i == depth - 1 && oldDepth < depth) {
+                continue
+            }
+            formatBuilder.WriteString("    ")
+        }
+        formatBuilder.WriteString(html.EscapeString(tmp))
+        formatBuilder.WriteString("\n")
+    }
+    return formatBuilder.String()
 }
 
+func (info *FeedInfo) GenerateRSS() string {
+    var outputBuilder strings.Builder
+    outputBuilder.WriteString(fmt.Sprintf(feedfmtopen, info.SiteName, info.SiteUrl, info.SiteDesc))
+    outputBuilder.WriteString("\n")
+    for _, item := range info.Items {
+        outputBuilder.WriteString(fmt.Sprintf(
+            itemfmt,
+            item.Title,
+            item.Url,
+            item.Url,
+            item.PubTime.Format("Mon, 2 Jan 2006 15:04:05 MST"), 
+            item.RawText,
+            ))
+        outputBuilder.WriteString("\n")
+    }
+    outputBuilder.WriteString(feedfmtclose)
+    return info.format(outputBuilder.String())
+}

feed/rss.go

@@ -1,64 +0,0 @@
-package feed
-
-import (
-	"fmt"
-	"strings"
-	"time"
-
-	"golang.org/x/net/html"
-)
-
-const feedfmt = `<?xml version="1.0" encoding="utf-8"?>
-    <rss version="2.0">
-        <channel>
-            <title>%s</title>
-            <link>%s</link>
-            <description>%s</description>%s
-        </channel>
-    </rss>`
-
-const itemfmt = `
-            <item>
-                <title>Content Title</title>
-                <link>%s</link>
-                <guid>%s</guid>
-                <pubDate>%s</pubDate>
-                <description>
-                    %s
-                </description>
-            </item>`
-
-type RSSBuilder struct {
-    Info    FeedInfo
-    Items   []FeedItem
-}
-
-func GenerateRss(siteUrl, siteTitle, siteDesc string, pageUrls ...string) (string, error) {
-    var items strings.Builder
-    var errs strings.Builder
-    var err error
-
-    for _, u := range pageUrls {
-        var formattedArticle strings.Builder
-        var err error
-        page, err := fetchPage(u)
-        if err != nil {
-            continue
-        }
-        article, atime, err := parseArticle(page)
-        if err != nil && article == "" {
-            errs.WriteString(fmt.Sprintf("error parsing article %s: %s", u, err.Error()))
-            continue
-        }
-        for _, line := range strings.Split(article, "\n") {
-            formattedArticle.WriteString(fmt.Sprintf("\t\t%s\n", html.EscapeString(line)))
-        }
-        if atime != nil {
-            items.WriteString(fmt.Sprintf(itemfmt, u, u, atime.Format("Mon, 2 Jan 2006 15:04:05 MST"), formattedArticle.String()))
-        } else {
-            items.WriteString(fmt.Sprintf(itemfmt, u, u, time.Now().Format("Mon, 2 Jan 2006 15:04:05 MST"), formattedArticle.String()))
-        }
-    }
-
-    return fmt.Sprintf(feedfmt, siteTitle, siteUrl, siteDesc, items.String()), err
-}

ui/html/htmx/feed-output.tmpl.html

@@ -0,0 +1,7 @@
+{{ range .Feeds }}
+<pre tabindex="0">
+    <code class="">
+{{ . }}
+    </code>
+</pre>
+{{ end }}

ui/html/pages/home.tmpl.html

@@ -28,8 +28,6 @@
         </p>
         <button id="generate-button" hx-get="/generate" hx-include="#generate-form" hx-params="*" hx-target="#output">Generate</button>
     </form>
-    <div class="output-container">
-        <code id="output">
-        </code>
+    <div id="output">
     </div>
 {{end}}