[enh] add supported_languages on engines and auto-generate languages.py

utils/update_languages.py

@@ -0,0 +1,99 @@
+# -*- coding: utf-8 -*-
+
+# This script generates languages.py from
+# intersecting each engine's supported languages.
+#
+# The language's native names are obtained from
+# Wikipedia's supported languages.
+#
+# Output file (languages.py) is written in current directory
+# to avoid overwriting in case something goes wrong.
+
+from requests import get
+from re import sub
+from lxml.html import fromstring
+from json import loads
+from sys import path
+path.append('../searx')
+from searx.engines import engines
+
+# list of language names
+wiki_languages_url = 'https://meta.wikimedia.org/wiki/List_of_Wikipedias'
+google_languages_url = 'https://www.google.com/preferences?#languages'
+
+google_json_name = 'google.preferences.langMap'
+
+languages = {}
+
+# Get language names from Wikipedia.
+def get_wikipedia_languages():
+    response = get(wiki_languages_url)
+    dom = fromstring(response.text)
+    tables = dom.xpath('//table[contains(@class,"sortable")]')
+    for table in tables:
+        # exclude header row
+        trs = table.xpath('.//tr')[1:]
+        for tr in trs:
+            td = tr.xpath('./td')
+            code = td[3].xpath('./a')[0].text
+            name = td[2].xpath('./a')[0].text
+            english_name = td[1].xpath('./a')[0].text
+            
+            if code not in languages:
+                languages[code] = (name, '', english_name)
+
+# Get language names from Google.
+def get_google_languages():
+    response = get(google_languages_url)
+    dom = fromstring(response.text)
+    options = dom.xpath('//select[@name="hl"]/option')
+    for option in options:
+        code = option.xpath('./@value')[0]
+        name = option.text[:-1]
+
+        if code not in languages:
+            languages[code] = (name, '', '')
+
+# Join all language lists.
+# iterate all languages supported by each engine
+def join_language_lists():
+    for engine_name in engines:
+        for locale in engines[engine_name].supported_languages:
+            locale = locale.replace('_', '-')
+            if locale not in languages:
+                # try to get language name
+                language = languages.get(locale.split('-')[0], None)
+                if language == None:
+                    print engine_name + ": " + locale
+                    continue
+
+                (name, country, english) = language
+                languages[locale] = (name, country, english)
+
+# Write languages.py.
+def write_languages_file():
+    new_file = open('languages.py', 'w')
+    file_content = '# -*- coding: utf-8 -*-\n'
+    file_content += '# list of language codes\n'
+    file_content += '# this file is generated automatically by utils/update_search_languages.py\n'
+    file_content += '\nlanguage_codes = ('
+    for code in languages:
+        (name, country, english) = languages[code]
+        file_content += '\n    (u"' + code + '"'\
+                        + ', u"' + name + '"'\
+                        + ', u"' + country[1:-1] + '"'\
+                        + ', u"' + english + '"),'
+    # remove last comma
+    file_content = file_content[:-1]
+    file_content += '\n)\n'
+    new_file.write(file_content.encode('utf8'))
+    new_file.close()
+
+def main():
+    get_wikipedia_languages()
+    get_google_languages()
+    join_language_lists()
+    write_languages_file()
+
+if __name__ == "__main__":
+    main()