wip: render markdown subset in issue/PR titles

Signed-off-by: oppiliappan <[e-mail]>

appview/pages/funcmap.go

···
 
 	"github.com/dustin/go-humanize"
 	"github.com/go-enry/go-enry/v2"
-	"github.com/microcosm-cc/bluemonday"
 	"tangled.sh/tangled.sh/core/appview/filetree"
 	"tangled.sh/tangled.sh/core/appview/pages/markup"
 )
···
 			}
 			return v.Slice(0, min(n, v.Len())).Interface()
 		},
-
 		"markdown": func(text string) template.HTML {
-			rctx := &markup.RenderContext{RendererType: markup.RendererTypeDefault}
-			return template.HTML(bluemonday.UGCPolicy().Sanitize(rctx.RenderMarkdown(text)))
+			p.rctx.RendererType = markup.RendererTypeDefault
+			htmlString := p.rctx.RenderMarkdown(text)
+			sanitized := p.rctx.SanitizeDefault(htmlString)
+			return template.HTML(sanitized)
+		},
+		"description": func(text string) template.HTML {
+			p.rctx.RendererType = markup.RendererTypeDefault
+			htmlString := p.rctx.RenderMarkdown(text)
+			sanitized := p.rctx.SanitizeDescription(htmlString)
+			return template.HTML(sanitized)
 		},
 		"isNil": func(t any) bool {
 			// returns false for other "zero" values

appview/pages/markup/markdown.go

···
 	return rctx.Sanitizer.defaultPolicy.Sanitize(html)
 }
 
+func (rctx *RenderContext) SanitizeDescription(html string) string {
+	return rctx.Sanitizer.descriptionPolicy.Sanitize(html)
+}
+
 type MarkdownTransformer struct {
 	rctx *RenderContext
 }

appview/pages/markup/sanitizer.go

···
 )
 
 type Sanitizer struct {
-	defaultPolicy *bluemonday.Policy
+	defaultPolicy     *bluemonday.Policy
+	descriptionPolicy *bluemonday.Policy
 }
 
 func NewSanitizer() Sanitizer {
 	return Sanitizer{
-		defaultPolicy: defaultPolicy(),
+		defaultPolicy:     defaultPolicy(),
+		descriptionPolicy: descriptionPolicy(),
 	}
 }
 
···
 
 	return policy
 }
+
+func descriptionPolicy() *bluemonday.Policy {
+	policy := bluemonday.NewPolicy()
+	policy.AllowStandardURLs()
+
+	// allow italics and bold.
+	policy.AllowElements("i", "b", "em", "strong")
+
+	// allow code.
+	policy.AllowElements("code")
+
+	// allow links
+	policy.AllowAttrs("href", "target", "rel").OnElements("a")
+
+	return policy
+}

appview/pages/templates/repo/issues/issue.html

···
 {{ define "repoContent" }}
   <header class="pb-4">
     <h1 class="text-2xl">
-      {{ .Issue.Title }}
+      {{ .Issue.Title | description }}
       <span class="text-gray-500 dark:text-gray-400">
         #{{ .Issue.IssueId }}
       </span>

appview/pages/templates/repo/issues/issues.html

···
           <a
             href="/{{ $.RepoInfo.FullName }}/issues/{{ .IssueId }}"
             class="no-underline hover:underline">
-            {{ .Title }}
+            {{ .Title | description }}
             <span class="text-gray-500">#{{ .IssueId }}</span>
           </a>
         </div>

appview/pages/templates/repo/pulls/fragments/summarizedPullHeader.html

···
         </div>
         <span class="truncate text-sm text-gray-800 dark:text-gray-200">
           <span class="text-gray-500 dark:text-gray-400">#{{ .PullId }}</span>
-          {{ .Title }}
+          {{ .Title | description }}
         </span>
       </div>
 

appview/pages/templates/repo/pulls/pull.html

···
                     {{ end }}
                   </div>
                   <div class="flex items-center">
-                    <span>{{ .Title }}</span>
+                    <span>{{ .Title | description }}</span>
                     {{ if gt (len .Body) 0 }}
                       <button
                         class="py-1/2 px-1 mx-2 bg-gray-200 hover:bg-gray-400 rounded dark:bg-gray-700 dark:hover:bg-gray-600"

appview/pages/templates/repo/pulls/pulls.html

···
             <a
               href="/{{ $.RepoInfo.FullName }}/pulls/{{ .PullId }}"
               class="dark:text-white">
-              {{ .Title }}
+              {{ .Title | description }}
               <span class="text-gray-500 dark:text-gray-400">
                 #{{ .PullId }}
               </span>