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Markus Heiser 9ae409a05a [mod] add locale.get_engine_locale to get predictable results
The match_language function sometimes returns incorrect results which is why a
new function get_engine_locale is required.

A bugfix of the match_language is not easily possible, because there is almost
no documentation for it and already the call parameters are undefined.  E.g. the
function processes values like the ones from yahoo::

    "yahoo": [
        "ar",
        ...
        "zh_chs",
        "zh_cht"
     ]

The get_engine_locale has been documented in detail, there is a clear
description of the assumptions as well as the requirements and approximation
rules (read doc-string for more details)::

    Argument ``engine_locales`` is a python dict that maps *SearXNG locales* to
    corresponding *engine locales*:

      <engine>: {
          # SearXNG string : engine-string
          'ca-ES'          : 'ca_ES',
          'fr-BE'          : 'fr_BE',
          'fr-CA'          : 'fr_CA',
          'fr-CH'          : 'fr_CH',
          'fr'             : 'fr_FR',
          ...
          'pl-PL'          : 'pl_PL',
          'pt-PT'          : 'pt_PT'
      }

    .. hint::

       The *SearXNG locale* string has to be known by babel!

In the following you will find a comparison:

>>> import babel.languages
>>> from searx.utils import match_language
>>> from searx.locales import get_engine_locale

Assume we have an engine that supports the follwoing locales:

>>> lang_list = {
...     "zh-CN": "zh_CN",
...     "zh-HK": "zh_HK",
...     "nl-BE": "nl_BE",
...     "fr-CA": "fr_CA",
... }

Assumption:

  A. When a user selects a language the results should be optimized according to
     the selected language.

  B. When user selects a language and a territory the results should be
     optimized with first priority on territory and second on language.

----

Example: (Assumption A.)

  A user selects region 'zh-TW' which should end in zh_HK

hint:
  CN is 'Hans' and HK ('Hant') fits better to TW ('Hant')

>>> get_engine_locale('zh-TW', lang_list)
'zh_HK'
>>> lang_list[match_language('zh-TW', lang_list)]
'zh_CN'

----

Example: (Assumption A.)

  A user selects only the language 'zh' which should end in CN

>>> get_engine_locale('zh', lang_list)
'zh_CN'
>>> lang_list[match_language('zh', lang_list)]
'zh_CN'

----

Example: (Assumption B.)

  A user selects region 'fr-BE' which should end in nl-BE

hint:
  priority should be on the territory the user selected.  If the user
  prefers 'fr' he will select 'fr' without a region tag.

>>> get_engine_locale('fr-BE', lang_list, default='unknown')
'nl_BE'
>>> match_language('fr-BE', lang_list, fallback='unknown')
'fr-CA'

----

Example: (Assumption A.)

  A user selects only the language 'fr' which should end in fr_CA

>>> get_engine_locale('fr', lang_list)
'fr_CA'
>>> lang_list[match_language('fr', lang_list)]
'fr_CA'

----

The difference in priority on the territory is best shown with a engine that
supports the following locales:

>>> lang_list = {
...     "fr-FR": "fr_FR",
...     "fr-CA": "fr_CA",
...     "en-GB": "en_GB",
...     "nl-BE": "nl_BE",
... }

----

Example: (Assumption A.)

   A user selects only a language

>>> get_engine_locale('en', lang_list)
'en_GB'
>>> match_language('en', lang_list)
'en-GB'

hint: the engine supports fr_FR and fr_CA since no territory is given, fr_FR
takes priority ..

>>> get_engine_locale('fr', lang_list)
'fr_FR'
>>> lang_list[match_language('fr', lang_list)]
'fr_FR'

----

Example: (Assumption B.)

  A user selects region 'fr-BE' which should end in nl-BE

>>> get_engine_locale('fr-BE', lang_list)
'nl_BE'
>>> lang_list[match_language('fr-BE', lang_list)]
'fr_FR'

----

If the user selects a language and there are two locales like the following:

>>> lang_list = {
...      "fr-BE": "fr_BE",
...      "fr-CH": "fr_CH",
...  }
>>>

>>> get_engine_locale('fr', lang_list)
'fr_BE'
>>> lang_list[match_language('fr', lang_list)]
'fr_BE'

Looks like both functions return the same value, but match_language depends on the
order of the dictionary (which is not predictable):

>>> lang_list = {
...      "fr-CH": "fr_CH",
...      "fr-BE": "fr_BE",
...  }
>>> get_engine_locale('fr', lang_list)
'fr_BE'
>>> lang_list[match_language('fr', lang_list)]
'fr_CH'
>>>

The get_engine_locale selects the locale by looking at the "population percent"
and this percentage has an higher amount in BE (68.%) compared to CH (21%)

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2022-08-14 10:35:55 +02:00
.github [clean up] drop obsolete searx, filtron and morty install scripts 2022-07-30 13:39:35 +02:00
dockerfiles docker: log to stdout 2022-03-19 13:47:45 +01:00
docs [mod] add 'Accept-Language' HTTP header to online processores 2022-08-01 17:01:59 +02:00
examples Fix whitespaces 2016-07-11 18:52:37 +07:00
searx [mod] add locale.get_engine_locale to get predictable results 2022-08-14 10:35:55 +02:00
searxng_extra fix searxng_extra/update/update*.py scripts 2022-07-02 12:16:00 +02:00
src/brand [simple] ImageLayout.watch: img_load_error.svg if img load fails 2021-11-29 21:10:13 +01:00
tests [fix] improve OpenSearch description 2022-08-11 19:04:36 +02:00
utils [fix] uWSGI: increase buffer-size 2022-07-31 12:40:06 +02:00
.coveragerc [mod] use github actions instead of travis 2020-11-17 15:09:06 +01:00
.dir-locals.el [emacs] flycheck should use the eslint checker from developer tools 2022-01-24 11:34:34 +01:00
.dockerignore [fix] tidy up ignore lists .gitignore & .dockerignore 2021-06-22 16:55:30 +02:00
.gitattributes [fix] update .gitattributes 2021-06-22 20:34:39 +02:00
.gitignore [fix] ensure that test.pyright installs pyright 2022-01-23 08:00:39 +01:00
.nvmrc Node: update to node 16.15.1 2022-06-25 14:07:39 +02:00
.pylintrc [fix] prepare for pylint 2.14.0 2022-06-03 15:41:52 +02:00
.weblate [translations] web integration 2021-08-07 15:06:06 +02:00
.yamllint.yml [enh] add test.yamllint - lint yaml files 2021-06-05 17:41:24 +02:00
AUTHORS.rst [mod] link to public-instances can be set to hidden 2022-07-04 13:26:01 +02:00
babel.cfg [fix] jinja/babel: WithExtension and AutoEscapeExtension are built-in now. 2022-03-25 09:42:12 +01:00
CHANGELOG.rst reference docs.searxng.org 2022-01-02 21:18:29 +01:00
CONTRIBUTING.md reference docs.searxng.org 2022-01-02 21:18:29 +01:00
Dockerfile Dockerfile: use alpine 3.16 2022-06-27 17:44:30 +00:00
LICENSE [fix] full AGPLv3+ license according to #382 2015-07-04 18:23:54 +02:00
Makefile [clean up] drop obsolete searx, filtron and morty install scripts 2022-07-30 13:39:35 +02:00
manage [fix] pyright repported errors 2022-07-30 18:04:44 +02:00
package.json Node: update to node 16.15.1 2022-06-25 14:07:39 +02:00
PULL_REQUEST_TEMPLATE.md Add PR template and contribution guidelines 2020-07-10 17:10:02 +02:00
pyrightconfig-ci.json [mod] add test.pyright to test & ci.test targets 2022-01-23 08:00:39 +01:00
pyrightconfig.json [fix] pyrightconfig.json include only dedicated folders in the test 2022-01-23 08:00:39 +01:00
README.rst [README] add doc-links: disable metrics & hostname replace 2022-07-05 14:19:48 +02:00
requirements-dev.txt Bump selenium from 4.3.0 to 4.4.0 2022-08-12 07:04:30 +00:00
requirements.txt Merge pull request #1656 from searxng/dependabot/pip/master/flask-2.2.2 2022-08-13 18:33:39 +02:00
SECURITY.md [enh] add security policy 2022-01-25 00:56:20 +01:00
setup.py [mod] replace /help by /info pages and include pages in project docs 2022-03-12 11:36:31 +01:00

.. SPDX-License-Identifier: AGPL-3.0-or-later

----

.. figure:: https://raw.githubusercontent.com/searxng/searxng/master/src/brand/searxng.svg
   :target: https://docs.searxng.org/
   :alt: SearXNG
   :width: 100%
   :align: center

----

Privacy-respecting, hackable `metasearch engine`_

If you are looking for running instances, ready to use, then visit searx.space_.
Otherwise jump to the user_, admin_ and developer_ handbooks you will find on
our homepage_.

|SearXNG install|
|SearXNG homepage|
|SearXNG wiki|
|AGPL License|
|Issues|
|commits|
|weblate|
|SearXNG logo|

----

.. _searx.space: https://searx.space
.. _user: https://docs.searxng.org/user
.. _admin: https://docs.searxng.org/admin
.. _developer: https://docs.searxng.org/dev
.. _homepage: https://docs.searxng.org/
.. _metasearch engine: https://en.wikipedia.org/wiki/Metasearch_engine

.. |SearXNG logo| image:: https://raw.githubusercontent.com/searxng/searxng/master/src/brand/searxng-wordmark.svg
   :target: https://docs.searxng.org/
   :width: 5%

.. |SearXNG install| image:: https://img.shields.io/badge/-install-blue
   :target: https://docs.searxng.org/admin/installation.html

.. |SearXNG homepage| image:: https://img.shields.io/badge/-homepage-blue
   :target: https://docs.searxng.org/

.. |SearXNG wiki| image:: https://img.shields.io/badge/-wiki-blue
   :target: https://github.com/searxng/searxng/wiki

.. |AGPL License|  image:: https://img.shields.io/badge/license-AGPL-blue.svg
   :target: https://github.com/searxng/searxng/blob/master/LICENSE

.. |Issues| image:: https://img.shields.io/github/issues/searxng/searxng?color=yellow&label=issues
   :target: https://github.com/searxng/searxng/issues

.. |PR| image:: https://img.shields.io/github/issues-pr-raw/searxng/searxng?color=yellow&label=PR
   :target: https://github.com/searxng/searxng/pulls

.. |commits| image:: https://img.shields.io/github/commit-activity/y/searxng/searxng?color=yellow&label=commits
   :target: https://github.com/searxng/searxng/commits/master

.. |weblate| image:: https://weblate.bubu1.eu/widgets/searxng/-/searxng/svg-badge.svg
   :target: https://weblate.bubu1.eu/projects/searxng/


Contact
=======

Come join us if you have questions or just want to chat about SearXNG.

Matrix
  `#searxng:matrix.org <https://matrix.to/#/#searxng:matrix.org>`_

IRC
  `#searxng on libera.chat <https://web.libera.chat/?channel=#searxng>`_
  which is bridged to Matrix.


Differences to searx
====================

SearXNG is a fork of `searx`_.  Here are some of the changes:

.. _searx: https://github.com/searx/searx


User experience
---------------

- Huge update of the simple theme:

  * usable on desktop, tablet and mobile
  * light and dark versions (you can choose in the preferences)
  * support right-to-left languages
  * `see the screenshots <https://dev.searxng.org/screenshots.html>`_

- the translations are up to date, you can contribute on `Weblate`_
- the preferences page has been updated:

  * you can see which engines are reliable or not
  * engines are grouped inside each tab
  * each engine has a description

- thanks to the anonymous metrics, it is easier to report a bug of an engine and
  thus engines get fixed more quickly

  - if you don't want any metrics to be recorded, you can `disable them on the server
    <https://docs.searxng.org/admin/engines/settings.html#general>`_

- administrator can `block and/or replace the URLs in the search results
  <https://github.com/searxng/searxng/blob/5c1c0817c3996c5670a545d05831d234d21e6217/searx/settings.yml#L191-L199>`_


Setup
-----

- you don't need `Morty`_ to proxy the images even on a public instance
- you don't need `Filtron`_ to block bots, we implemented the builtin `limiter`_
- you get a well maintained `Docker image`_, now also built for ARM64 and ARM/v7 architectures
- alternatively we have up to date installation scripts

.. _Docker image: https://github.com/searxng/searxng-docker


Contributing is easier
----------------------

- readable debug log
- contributions to the themes are made easier, check out our `Development
  Quickstart`_ guide
- a lot of code cleanup and bug fixes
- the dependencies are up to date

.. _Morty: https://github.com/asciimoo/morty
.. _Filtron: https://github.com/searxng/filtron
.. _limiter: https://docs.searxng.org/src/searx.plugins.limiter.html
.. _Weblate: https://weblate.bubu1.eu/projects/searxng/searxng/
.. _Development Quickstart: https://docs.searxng.org/dev/quickstart.html


Translations
============

We need translators, suggestions are welcome at
https://weblate.bubu1.eu/projects/searxng/searxng/

.. figure:: https://weblate.bubu1.eu/widgets/searxng/-/multi-auto.svg
   :target: https://weblate.bubu1.eu/projects/searxng/


Make a donation
===============

You can support the SearXNG project by clicking on the donation page:
https://docs.searxng.org/donate.html