Add env vars for hiding favicons and removing daily update check

- WHOOGLE_SHOW_FAVICONS: Default on, can be set to 0 to hide favicons
  and skip the request for fetching them
- WHOOGLE_UPDATE_CHECK: Default on, can be set to 0 to disable the
  daily check for new versions released on github

Closes #1098
Closes #1059

README.md

@@ -422,6 +422,8 @@ There are a few optional environment variables available for customizing a Whoog
 | WHOOGLE_TOR_SERVICE  | Enable/disable the Tor service on startup. Default on -- use '0' to disable.              |
 | WHOOGLE_TOR_USE_PASS | Use password authentication for tor control port. |
 | WHOOGLE_TOR_CONF | The absolute path to the config file containing the password for the tor control port. Default: ./misc/tor/control.conf WHOOGLE_TOR_PASS must be 1 for this to work.|
+| WHOOGLE_SHOW_FAVICONS | Show/hide favicons next to search result URLs. Default on.                               |
+| WHOOGLE_UPDATE_CHECK  | Enable/disable the automatic daily check for new versions of Whoogle. Default on.        |
 
 ### Config Environment Variables
 These environment variables allow setting default config values, but can be overwritten manually by using the home page config menu. These allow a shortcut for destroying/rebuilding an instance to the same config state every time.

app/filter.py

@@ -244,7 +244,9 @@ class Filter:
             None (The soup object is modified directly)
         """
         # Skip empty, parentless, or internal links
-        if not link or not link.parent or not link['href'].startswith('http'):
+        show_favicons = read_config_bool('WHOOGLE_SHOW_FAVICONS', True)
+        is_valid_link = link and link.parent and link['href'].startswith('http')
+        if not show_favicons or not is_valid_link:
             return
 
         parent = link.parent

app/routes.py

@@ -135,7 +135,8 @@ def before_request_func():
 
     # Check for latest version if needed
     now = datetime.now()
-    if now - timedelta(hours=24) > app.config['LAST_UPDATE_CHECK']:
+    needs_update_check = now - timedelta(hours=24) > app.config['LAST_UPDATE_CHECK']
+    if read_config_bool('WHOOGLE_UPDATE_CHECK', True) and needs_update_check:
         app.config['LAST_UPDATE_CHECK'] = now
         app.config['HAS_UPDATE'] = check_for_update(
             app.config['RELEASES_URL'],

app/static/css/search.css

@@ -64,7 +64,7 @@ details summary span {
 	padding-right: 5px;
 }
 
-.sCuL3 {
+.has-favicon .sCuL3 {
 	padding-left: 30px;
 }
 

app/utils/misc.py

@@ -56,8 +56,8 @@ def gen_file_hash(path: str, static_file: str) -> str:
     return filename_split[0] + '.' + file_hash + filename_split[-1]
 
 
-def read_config_bool(var: str) -> bool:
-    val = os.getenv(var, '0')
+def read_config_bool(var: str, default: bool=False) -> bool:
+    val = os.getenv(var, '1' if default else '0')
     # user can specify one of the following values as 'true' inputs (all
     # variants with upper case letters will also work):
     # ('true', 't', '1', 'yes', 'y')