Carry over audio-only mode in playlist links

assets/js/watch.js

@@ -67,6 +67,10 @@ function get_playlist(plid) {
             '&format=html&hl=' + video_data.preferences.locale;
     }
 
+    if (video_data.params.listen) {
+        plid_url += '&listen=1'
+    }
+
     helpers.xhr('GET', plid_url, {retries: 5, entity_name: 'playlist'}, {
         on200: function (response) {
             playlist.innerHTML = response.playlistHtml;

src/invidious/mixes.cr

@@ -81,7 +81,7 @@ def fetch_mix(rdid, video_id, cookies = nil, locale = nil)
   })
 end
 
-def template_mix(mix)
+def template_mix(mix, listen)
   html = <<-END_HTML
   <h3>
     <a href="/mix?list=#{mix["mixId"]}">
@@ -95,7 +95,7 @@ def template_mix(mix)
   mix["videos"].as_a.each do |video|
     html += <<-END_HTML
       <li class="pure-menu-item">
-        <a href="/watch?v=#{video["videoId"]}&list=#{mix["mixId"]}">
+        <a href="/watch?v=#{video["videoId"]}&list=#{mix["mixId"]}#{listen ? "&listen=1" : ""}">
           <div class="thumbnail">
               <img loading="lazy" class="thumbnail" src="/vi/#{video["videoId"]}/mqdefault.jpg" alt="" />
               <p class="length">#{recode_length_seconds(video["lengthSeconds"].as_i)}</p>

src/invidious/playlists.cr

@@ -498,7 +498,7 @@ def extract_playlist_videos(initial_data : Hash(String, JSON::Any))
   return videos
 end
 
-def template_playlist(playlist)
+def template_playlist(playlist, listen)
   html = <<-END_HTML
   <h3>
     <a href="/playlist?list=#{playlist["playlistId"]}">
@@ -512,7 +512,7 @@ def template_playlist(playlist)
   playlist["videos"].as_a.each do |video|
     html += <<-END_HTML
       <li class="pure-menu-item" id="#{video["videoId"]}">
-        <a href="/watch?v=#{video["videoId"]}&list=#{playlist["playlistId"]}&index=#{video["index"]}">
+        <a href="/watch?v=#{video["videoId"]}&list=#{playlist["playlistId"]}&index=#{video["index"]}#{listen ? "&listen=1" : ""}">
           <div class="thumbnail">
               <img loading="lazy" class="thumbnail" src="/vi/#{video["videoId"]}/mqdefault.jpg" alt="" />
               <p class="length">#{recode_length_seconds(video["lengthSeconds"].as_i)}</p>

src/invidious/routes/api/v1/misc.cr

@@ -42,6 +42,9 @@ module Invidious::Routes::API::V1::Misc
     format = env.params.query["format"]?
     format ||= "json"
 
+    listenParam = env.params.query["listen"]?
+    listen = (listenParam == "true" || listenParam == "1")
+
     if plid.starts_with? "RD"
       return env.redirect "/api/v1/mixes/#{plid}"
     end
@@ -85,7 +88,7 @@ module Invidious::Routes::API::V1::Misc
     end
 
     if format == "html"
-      playlist_html = template_playlist(json_response)
+      playlist_html = template_playlist(json_response, listen)
       index, next_video = json_response["videos"].as_a.skip(1 + lookback).select { |video| !video["author"].as_s.empty? }[0]?.try { |v| {v["index"], v["videoId"]} } || {nil, nil}
 
       response = {
@@ -111,6 +114,9 @@ module Invidious::Routes::API::V1::Misc
     format = env.params.query["format"]?
     format ||= "json"
 
+    listenParam = env.params.query["listen"]?
+    listen = (listenParam == "true" || listenParam == "1")
+
     begin
       mix = fetch_mix(rdid, continuation, locale: locale)
 
@@ -157,7 +163,7 @@ module Invidious::Routes::API::V1::Misc
 
     if format == "html"
       response = JSON.parse(response)
-      playlist_html = template_mix(response)
+      playlist_html = template_mix(response, listen)
       next_video = response["videos"].as_a.select { |video| !video["author"].as_s.empty? }[0]?.try &.["videoId"]
 
       response = {