Add size to image alt text

1 files changed, 23 insertions, 3 deletions

diff --git a/lib/render.js b/lib/render.js
index cca56f0..13d5d13 100644
--- a/lib/render.js
+++ b/lib/render.js
@@ -23,13 +23,13 @@ MdRenderer.prototype.urltransform = function (href) {
   return this.render.toUrl(href)
 }
 
-MdRenderer.prototype.image = function (href, title, text) {
-  href = this.render.imageUrl(href)
+MdRenderer.prototype.image = function (ref, title, text) {
+  var href = this.render.imageUrl(href)
   var name = text || title
   if (name) href += '?name=' + encodeURIComponent(name)
   return h('img', {
     src: href,
-    alt: text,
+    alt: this.render.getImageAlt(ref, text),
     title: title || undefined
   }).outerHTML
 }
@@ -93,15 +93,19 @@ function fixSymbols(str) {
 Render.prototype.markdown = function (text, mentions) {
   if (!text) return ''
   var mentionsObj = this._mentions = {}
+  var mentionsByLink = this._mentionsByLink = {}
   if (Array.isArray(mentions)) mentions.forEach(function (link) {
     if (!link) return
     else if (link.name)
       mentionsObj['@' + link.name] = link.link
     else if (link.host === 'http://localhost:7777')
       mentionsObj[link.href] = link.link
+    if (link.link)
+      mentionsByLink[link.link] = link
   })
   var out = marked(String(text), this.markedOpts)
   delete this._mentions
+  delete this._mentionsByLink
   return out //fixSymbols(out)
 }
 
@@ -111,6 +115,22 @@ Render.prototype.imageUrl = function (ref) {
   return this.opts.img_base + ref
 }
 
+Render.prototype.getImageAlt = function (id, fallback) {
+  var link = this._mentionsByLink[id]
+  if (!link) return fallback
+  var name = link.name || fallback
+  return name
+    + (link.size != null ? ' (' + this.formatSize(link.size) + ')' : '')
+}
+
+Render.prototype.formatSize = function (size) {
+  if (size < 1024) return size + ' B'
+  size /= 1024
+  if (size < 1024) return size.toFixed(2) + ' KB'
+  size /= 1024
+  return size.toFixed(2) + ' MB'
+}
+
 Render.prototype.toUrl = function (href) {
   if (!href) return href
   var mentions = this._mentions