From 2e10c1732aba2e108b28a7330da69f593de9fb2c Mon Sep 17 00:00:00 2001
From: Thomas Miceli <27960254+thomiceli@users.noreply.github.com>
Date: Tue, 3 Feb 2026 15:55:44 +0700
Subject: [PATCH] Add images and binary content on gist preview (#615)

---
 internal/db/gist.go                   |  3 +++
 internal/render/highlight.go          | 17 ++++++++++++--
 public/ts/gist.ts                     |  7 +-----
 public/ts/main.ts                     |  5 +++++
 templates/partials/_gist_preview.html | 32 ++++++++++++++++++++++++---
 5 files changed, 53 insertions(+), 11 deletions(-)

diff --git a/internal/db/gist.go b/internal/db/gist.go
index 511dc86..9b7bc19 100644
--- a/internal/db/gist.go
+++ b/internal/db/gist.go
@@ -73,6 +73,7 @@ type Gist struct {
 	URL             string
 	Preview         string
 	PreviewFilename string
+	PreviewMimeType string
 	Description     string
 	Private         Visibility // 0: public, 1: unlisted, 2: private
 	UserID          uint
@@ -551,6 +552,7 @@ func (gist *Gist) UpdatePreviewAndCount(withTimestampUpdate bool) error {
 	if len(filesStr) == 0 {
 		gist.Preview = ""
 		gist.PreviewFilename = ""
+		gist.PreviewMimeType = ""
 	} else {
 		for _, fileStr := range filesStr {
 			file, err := gist.File("HEAD", fileStr, true)
@@ -562,6 +564,7 @@ func (gist *Gist) UpdatePreviewAndCount(withTimestampUpdate bool) error {
 			}
 			gist.Preview = ""
 			gist.PreviewFilename = file.Filename
+			gist.PreviewMimeType = file.MimeType.ContentType
 
 			if !file.MimeType.CanBeEdited() {
 				continue
diff --git a/internal/render/highlight.go b/internal/render/highlight.go
index cef4e78..3b85669 100644
--- a/internal/render/highlight.go
+++ b/internal/render/highlight.go
@@ -27,8 +27,9 @@ func (r HighlightedFile) InternalType() string {
 
 type RenderedGist struct {
 	*db.Gist
-	Lines []string
-	HTML  string
+	Lines           []string
+	HTML            string
+	PreviewMimeType *git.MimeType
 }
 
 func highlightFile(file *git.File) (HighlightedFile, error) {
@@ -76,6 +77,18 @@ func HighlightGistPreview(gist *db.Gist) (RenderedGist, error) {
 		Gist: gist,
 	}
 
+	if gist.PreviewMimeType != "" {
+		mt := &git.MimeType{ContentType: gist.PreviewMimeType}
+		if mt.CanBeEmbedded() {
+			rendered.PreviewMimeType = mt
+			return rendered, nil
+		}
+	}
+
+	if gist.Preview == "" {
+		return rendered, nil
+	}
+
 	style := newStyle()
 	lexer := newLexer(gist.PreviewFilename)
 	if lexer.Config().Name == "markdown" {
diff --git a/public/ts/gist.ts b/public/ts/gist.ts
index 44293d7..0c9e0a4 100644
--- a/public/ts/gist.ts
+++ b/public/ts/gist.ts
@@ -1,5 +1,4 @@
 import '../ts/ipynb.ts';
-import PDFObject from 'pdfobject';
 
 document.querySelectorAll<HTMLElement>('.table-code').forEach((el) => {
     el.addEventListener('click', event => {
@@ -76,8 +75,4 @@ if (document.getElementById('gist').dataset.own) {
     checkboxes.forEach((el: HTMLButtonElement) => {
         el.disabled = true;
     });
-}
-
-document.querySelectorAll(".pdf").forEach((el) => {
-    PDFObject.embed(el.dataset.src || "", el);
-})
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/public/ts/main.ts b/public/ts/main.ts
index 0ceaeb9..b712061 100644
--- a/public/ts/main.ts
+++ b/public/ts/main.ts
@@ -2,9 +2,14 @@ import '../css/tailwind.css';
 import '../img/favicon-32.png';
 import '../img/opengist.svg';
 import jdenticon from 'jdenticon/standalone';
+import PDFObject from 'pdfobject';
 
 jdenticon.update("[data-jdenticon-value]")
 
+document.querySelectorAll(".pdf").forEach((el) => {
+    PDFObject.embed(el.dataset.src || "", el);
+})
+
 document.addEventListener('DOMContentLoaded', () => {
     document.getElementById('user-btn')?.addEventListener("click" , () => {
         document.getElementById('user-menu')!.classList.toggle('hidden');
diff --git a/templates/partials/_gist_preview.html b/templates/partials/_gist_preview.html
index 2d88b05..d26749b 100644
--- a/templates/partials/_gist_preview.html
+++ b/templates/partials/_gist_preview.html
@@ -60,7 +60,33 @@
             <div class="rounded-md border border-1 border-gray-200 dark:border-gray-700 overflow-auto hover:border-primary-600">
                 <div class="code overflow-auto">
                     {{ if .gist.PreviewFilename }}
-                        {{ if .gist.Preview }}
+                        {{ if .gist.PreviewMimeType }}
+                            {{ if .gist.PreviewMimeType.IsSVG }}
+                                <div class="p-8 flex justify-center">
+                                    <img src="{{ .c.ExternalUrl }}/{{ .gist.User.Username }}/{{ .gist.Identifier }}/raw/HEAD/{{ .gist.PreviewFilename }}" alt="{{ .gist.PreviewFilename }}" class="max-h-80 object-contain">
+                                </div>
+                            {{ else if .gist.PreviewMimeType.IsImage }}
+                                <div class="p-8 flex justify-center">
+                                    <img src="{{ .c.ExternalUrl }}/{{ .gist.User.Username }}/{{ .gist.Identifier }}/raw/HEAD/{{ .gist.PreviewFilename }}" alt="{{ .gist.PreviewFilename }}" class="max-h-80 object-contain">
+                                </div>
+                            {{ else if .gist.PreviewMimeType.IsAudio }}
+                                <div class="p-8 flex justify-center">
+                                    <audio controls class="w-full max-w-lg">
+                                        <source src="{{ .c.ExternalUrl }}/{{ .gist.User.Username }}/{{ .gist.Identifier }}/raw/HEAD/{{ .gist.PreviewFilename }}" type="{{ .gist.PreviewMimeType.ContentType }}">
+                                    </audio>
+                                </div>
+                            {{ else if .gist.PreviewMimeType.IsVideo }}
+                                <div class="p-8 flex justify-center">
+                                    <video controls class="max-h-80 max-w-full">
+                                        <source src="{{ .c.ExternalUrl }}/{{ .gist.User.Username }}/{{ .gist.Identifier }}/raw/HEAD/{{ .gist.PreviewFilename }}" type="{{ .gist.PreviewMimeType.ContentType }}">
+                                    </video>
+                                </div>
+                            {{ else if .gist.PreviewMimeType.IsPDF }}
+                                <div class="pdf max-h-80" data-src="{{ .c.ExternalUrl }}/{{ .gist.User.Username }}/{{ .gist.Identifier }}/raw/HEAD/{{ .gist.PreviewFilename }}"></div>
+                            {{ else }}
+                                <div class="pl-4 py-0.5 text-xs"><p>{{ .locale.Tr "gist.preview-non-available" }}</p></div>
+                            {{ end }}
+                        {{ else if .gist.Preview }}
                             {{ if isMarkdown .gist.PreviewFilename }}
                                 <div class="chroma preview markdown markdown-body p-8">{{ .gist.HTML | safe }}</div>
                             {{ else }}
@@ -80,8 +106,8 @@
                                 </table>
                             {{ end }}
                         {{ else }}
-                        <div class="pl-4 py-0.5 text-xs"><p>{{ .locale.Tr "gist.preview-non-available" }}</p></div>
-                    {{ end }}
+                            <div class="pl-4 py-0.5 text-xs"><p>{{ .locale.Tr "gist.preview-non-available" }}</p></div>
+                        {{ end }}
                     {{ else }}
                         <div class="pl-4 py-0.5 text-xs"><p>{{ .locale.Tr "gist.no-content" }}</p></div>
                     {{ end }}