Plugin pages render through page_content.html, not custom templates

Plugins no longer need theme-specific templates. The scholar plugin
now generates its article list as HTML and passes it via plugin_content,
which page_content.html renders as raw HTML. Regular content pages
continue to use Showdown markdown rendering.

This means:
- Any theme works with any page plugin automatically
- No page_research.html needed in themes
- Plugin controls its own HTML layout
- Citation count and journal info now shown inline
- All output properly HTML-escaped

Removed: page_research.html and research.html from all themes.
Updated: page_content.html in all themes to check for plugin_content.

Closes #513

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: compscidr

plugins/scholar/scholar.go

@@ -7,8 +7,10 @@ import (
 	"errors"
 	"fmt"
 	"goblog/blog"
+	"html"
 	"log"
 	"sort"
+	"strconv"
 	"sync"
 	"time"
 
@@ -118,8 +120,8 @@ func (p *ScholarPlugin) RenderPage(ctx *gplugin.HookContext, pageType string) (s
 	settings := ctx.Settings
 	scholarID := settings["scholar_id"]
 	if scholarID == "" {
-		return "page_research.html", gin.H{
-			"errors": "Google Scholar ID not configured. Set it in the Scholar plugin settings.",
+		return "page_content.html", gin.H{
+			"plugin_content": `<div class="alert alert-warning">Google Scholar ID not configured. Set it in the Scholar plugin settings.</div>`,
 		}
 	}
 
@@ -132,18 +134,44 @@ func (p *ScholarPlugin) RenderPage(ctx *gplugin.HookContext, pageType string) (s
 	p.ensureScholar(settings)
 
 	articles, err := p.sch.QueryProfileWithMemoryCache(scholarID, limit)
-	data := gin.H{}
-	if err == nil {
-		sortArticlesByDateDesc(articles)
-		p.sch.SaveCache(settings["profile_cache"], settings["article_cache"])
-		data["articles"] = articles
-	} else {
+	if err != nil {
 		log.Printf("Scholar query failed: %v", err)
-		data["articles"] = make([]*scholarlib.Article, 0)
-		data["errors"] = err.Error()
+		return "page_content.html", gin.H{
+			"plugin_content": `<div class="alert alert-danger">` + html.EscapeString(err.Error()) + `</div>`,
+		}
 	}
 
-	return "page_research.html", data
+	sortArticlesByDateDesc(articles)
+	p.sch.SaveCache(settings["profile_cache"], settings["article_cache"])
+
+	return "page_content.html", gin.H{
+		"plugin_content": renderArticlesHTML(articles),
+	}
+}
+
+// renderArticlesHTML generates the HTML for the articles list.
+func renderArticlesHTML(articles []*scholarlib.Article) string {
+	out := ""
+	for _, a := range articles {
+		out += `<div style="margin-bottom: 12px; padding-bottom: 12px; border-bottom: 1px solid #eee;">`
+		out += `<div><a href="` + html.EscapeString(a.ScholarURL) + `">` + html.EscapeString(a.Title) + `</a></div>`
+		if a.Authors != "" {
+			out += `<div style="color: #666; font-size: 13px;">` + html.EscapeString(a.Authors) + `</div>`
+		}
+		out += `<div style="color: #888; font-size: 13px;">`
+		if a.Year > 0 {
+			out += strconv.Itoa(a.Year)
+		}
+		if a.Journal != "" {
+			out += ` &middot; ` + html.EscapeString(a.Journal)
+		}
+		if a.NumCitations > 0 {
+			out += ` &middot; ` + strconv.Itoa(a.NumCitations) + ` citations`
+		}
+		out += `</div>`
+		out += `</div>`
+	}
+	return out
 }
 
 func (p *ScholarPlugin) ScheduledJobs() []gplugin.ScheduledJob {

themes/default/templates/page_content.html

@@ -21,15 +21,18 @@ <h1>{{ .page.Title }}</h1>
     {{ if .is_admin }}
     <p class="text-left"><a href="/admin/pages/{{ .page.ID }}">Edit this page</a></p>
     {{ end }}
+    {{ if .plugin_content }}
+    <div id="page-content">{{ .plugin_content | rawHTML }}</div>
+    {{ else }}
     <div id="page-content"></div>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/2.1.0/showdown.min.js" integrity="sha512-LhccdVNGe2QMEfI3x4DVV3ckMRe36TfydKss6mJpdHjNFiV07dFpS2xzeZedptKZrwxfICJpez09iNioiSZ3hA==" crossorigin="anonymous"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/dompurify/3.2.7/purify.min.js" integrity="sha512-78KH17QLT5e55GJqP76vutp1D2iAoy06WcYBXB6iBCsmO6wWzx0Qdg8EDpm8mKXv68BcvHOyeeP4wxAL0twJGQ==" crossorigin="anonymous"></script>
+    <script>
+      var converter = new showdown.Converter({tables: true});
+      var content = {{ .page.Content }};
+      document.getElementById('page-content').innerHTML = DOMPurify.sanitize(converter.makeHtml(content));
+    </script>
+    {{ end }}
   </div>
 
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/2.1.0/showdown.min.js" integrity="sha512-LhccdVNGe2QMEfI3x4DVV3ckMRe36TfydKss6mJpdHjNFiV07dFpS2xzeZedptKZrwxfICJpez09iNioiSZ3hA==" crossorigin="anonymous"></script>
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/dompurify/3.2.7/purify.min.js" integrity="sha512-78KH17QLT5e55GJqP76vutp1D2iAoy06WcYBXB6iBCsmO6wWzx0Qdg8EDpm8mKXv68BcvHOyeeP4wxAL0twJGQ==" crossorigin="anonymous"></script>
-  <script>
-    var converter = new showdown.Converter({tables: true});
-    var content = {{ .page.Content }};
-    document.getElementById('page-content').innerHTML = DOMPurify.sanitize(converter.makeHtml(content));
-  </script>
-
 {{ template "footer.html" .}}

themes/default/templates/page_research.html

@@ -5,15 +5,18 @@ <h1>{{ .page.Title }}</h1>
     {{ if .is_admin }}
     <p class="text-left"><a href="/admin/pages/{{ .page.ID }}">Edit this page</a></p>
     {{ end }}
+    {{ if .plugin_content }}
+    <div id="page-content">{{ .plugin_content | rawHTML }}</div>
+    {{ else }}
     <div id="page-content"></div>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/2.1.0/showdown.min.js" integrity="sha512-LhccdVNGe2QMEfI3x4DVV3ckMRe36TfydKss6mJpdHjNFiV07dFpS2xzeZedptKZrwxfICJpez09iNioiSZ3hA==" crossorigin="anonymous"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/dompurify/3.2.7/purify.min.js" integrity="sha512-78KH17QLT5e55GJqP76vutp1D2iAoy06WcYBXB6iBCsmO6wWzx0Qdg8EDpm8mKXv68BcvHOyeeP4wxAL0twJGQ==" crossorigin="anonymous"></script>
+    <script>
+      var converter = new showdown.Converter({tables: true});
+      var content = {{ .page.Content }};
+      document.getElementById('page-content').innerHTML = DOMPurify.sanitize(converter.makeHtml(content));
+    </script>
+    {{ end }}
   </div></div>
 
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/2.1.0/showdown.min.js" integrity="sha512-LhccdVNGe2QMEfI3x4DVV3ckMRe36TfydKss6mJpdHjNFiV07dFpS2xzeZedptKZrwxfICJpez09iNioiSZ3hA==" crossorigin="anonymous"></script>
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/dompurify/3.2.7/purify.min.js" integrity="sha512-78KH17QLT5e55GJqP76vutp1D2iAoy06WcYBXB6iBCsmO6wWzx0Qdg8EDpm8mKXv68BcvHOyeeP4wxAL0twJGQ==" crossorigin="anonymous"></script>
-  <script>
-    var converter = new showdown.Converter({tables: true});
-    var content = {{ .page.Content }};
-    document.getElementById('page-content').innerHTML = DOMPurify.sanitize(converter.makeHtml(content));
-  </script>
-
 {{ template "footer.html" .}}

themes/default/templates/research.html

@@ -5,15 +5,18 @@ <h1>{{ .page.Title }}</h1>
     {{ if .is_admin }}
     <p class="text-left"><a href="/admin/pages/{{ .page.ID }}">Edit this page</a></p>
     {{ end }}
+    {{ if .plugin_content }}
+    <div id="page-content">{{ .plugin_content | rawHTML }}</div>
+    {{ else }}
     <div id="page-content"></div>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/2.1.0/showdown.min.js" integrity="sha512-LhccdVNGe2QMEfI3x4DVV3ckMRe36TfydKss6mJpdHjNFiV07dFpS2xzeZedptKZrwxfICJpez09iNioiSZ3hA==" crossorigin="anonymous"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/dompurify/3.2.7/purify.min.js" integrity="sha512-78KH17QLT5e55GJqP76vutp1D2iAoy06WcYBXB6iBCsmO6wWzx0Qdg8EDpm8mKXv68BcvHOyeeP4wxAL0twJGQ==" crossorigin="anonymous"></script>
+    <script>
+      var converter = new showdown.Converter({tables: true});
+      var content = {{ .page.Content }};
+      document.getElementById('page-content').innerHTML = DOMPurify.sanitize(converter.makeHtml(content));
+    </script>
+    {{ end }}
   </div>
 
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/2.1.0/showdown.min.js" integrity="sha512-LhccdVNGe2QMEfI3x4DVV3ckMRe36TfydKss6mJpdHjNFiV07dFpS2xzeZedptKZrwxfICJpez09iNioiSZ3hA==" crossorigin="anonymous"></script>
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/dompurify/3.2.7/purify.min.js" integrity="sha512-78KH17QLT5e55GJqP76vutp1D2iAoy06WcYBXB6iBCsmO6wWzx0Qdg8EDpm8mKXv68BcvHOyeeP4wxAL0twJGQ==" crossorigin="anonymous"></script>
-  <script>
-    var converter = new showdown.Converter({tables: true});
-    var content = {{ .page.Content }};
-    document.getElementById('page-content').innerHTML = DOMPurify.sanitize(converter.makeHtml(content));
-  </script>
-
 {{ template "footer.html" .}}