[mod] solidtorrents engine: add metadata & torrentfile

BTW: define min_len in eval_xpath_list of 'stats' list

Suggested-by: @dalf https://github.com/searxng/searxng/pull/862#pullrequestreview-872910744
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/solidtorrents.py

@@ -13,6 +13,7 @@ from searx.utils import (
     extract_text,
     eval_xpath,
     eval_xpath_getindex,
+    eval_xpath_list,
     get_torrent_size,
 )
 
@@ -55,11 +56,14 @@ def response(resp):
             continue
         title = extract_text(a)
         url = eval_xpath_getindex(a, '@href', 0, None)
-        stats = eval_xpath(result, './div//div[contains(@class, "stats")]/div')
+        categ = eval_xpath(result, './div//a[contains(@class, "category")]')
+        metadata = extract_text(categ)
+        stats = eval_xpath_list(result, './div//div[contains(@class, "stats")]/div', min_len=5)
         n, u = extract_text(stats[1]).split()
         filesize = get_torrent_size(n, u)
         leech = extract_text(stats[2])
         seed = extract_text(stats[3])
+        torrentfile = eval_xpath_getindex(result, './div//a[contains(@class, "dl-torrent")]/@href', 0, None)
         magnet = eval_xpath_getindex(result, './div//a[contains(@class, "dl-magnet")]/@href', 0, None)
 
         params = {
@@ -69,6 +73,8 @@ def response(resp):
             'url': base_url_rand + url,
             'filesize': filesize,
             'magnetlink': magnet,
+            'torrentfile': torrentfile,
+            'metadata': metadata,
             'template': "torrent.html",
         }