[fix] drop etools engine module

The implementation of the etools engine is poor.  No date-range support, no
language support and it is broken by a CAPTCHA.

etools is a metasearch engine, the major search engines it supports (google,
bing, wikipedia, Yahoo) are already available in SeaarXNG.

While etools does support several engines we currently don't support directly,
support for them should be added directly to SearXNG if there is demand.

In practice: in SearXNG the worse etools results will be mixed with good results
from other engines we have (as long as there is no captcha).

At best case, what we win with etools is in e.g. results from de.ask.com in a
query from a german request .. in all other cases worse results are bubble up in
SearXNG's result list.

[1] https://github.com/searxng/searxng/issues/696#issuecomment-1005855499

Closes: https://github.com/searxng/searxng/issues/696
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/etools.py

@@ -1,58 +0,0 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
-"""
- eTools (Web)
-"""
-
-from lxml import html
-from urllib.parse import quote
-from searx.utils import extract_text, eval_xpath
-
-# about
-about = {
-    "website": 'https://www.etools.ch',
-    "wikidata_id": None,
-    "official_api_documentation": None,
-    "use_official_api": False,
-    "require_api_key": False,
-    "results": 'HTML',
-}
-
-categories = ['general', 'web']
-paging = False
-safesearch = True
-
-base_url = 'https://www.etools.ch'
-search_path = (
-    # fmt: off
-    '/searchAdvancedSubmit.do'
-    '?query={search_term}'
-    '&pageResults=20'
-    '&safeSearch={safesearch}'
-    # fmt: on
-)
-
-
-def request(query, params):
-    if params['safesearch']:
-        safesearch = 'true'
-    else:
-        safesearch = 'false'
-
-    params['url'] = base_url + search_path.format(search_term=quote(query), safesearch=safesearch)
-
-    return params
-
-
-def response(resp):
-    results = []
-
-    dom = html.fromstring(resp.text)
-
-    for result in eval_xpath(dom, '//table[@class="result"]//td[@class="record"]'):
-        url = eval_xpath(result, './a/@href')[0]
-        title = extract_text(eval_xpath(result, './a//text()'))
-        content = extract_text(eval_xpath(result, './/div[@class="text"]//text()'))
-
-        results.append({'url': url, 'title': title, 'content': content})
-
-    return results

searx/settings.yml

@@ -479,13 +479,6 @@ engines:
     timeout: 3.0
     disabled: true
 
-  - name: etools
-    engine: etools
-    shortcut: eto
-    disabled: true
-    additional_tests:
-      rosebud: *test_rosebud
-
   - name: etymonline
     engine: xpath
     paging: true