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from __future__ import annotations
import json
import logging
import os
import gettext
from dataclasses import dataclass
from pathlib import Path
from typing import List, Dict, Any, TYPE_CHECKING, Optional
from .exceptions import TranslationError
if TYPE_CHECKING:
_: Any
@dataclass
class Language:
abbr: str
name_en: str
translation: gettext.NullTranslations
translation_percent: int
translated_lang: Optional[str]
external_dep: Optional[str]
@property
def display_name(self) -> str:
if not self.external_dep and self.translated_lang:
name = self.translated_lang
else:
name = self.name_en
return f'{name} ({self.translation_percent}%)'
def is_match(self, lang_or_translated_lang: str) -> bool:
if self.name_en == lang_or_translated_lang:
return True
elif self.translated_lang == lang_or_translated_lang:
return True
return False
def json(self) -> str:
return self.name_en
class TranslationHandler:
def __init__(self):
self._base_pot = 'base.pot'
self._languages = 'languages.json'
# check if a custom font was provided, otherwise we'll
# use one that can display latin, greek, cyrillic characters
if self.is_custom_font_enabled():
self._set_font(self.custom_font_path().name)
else:
self._set_font('LatGrkCyr-8x16')
self._total_messages = self._get_total_active_messages()
self._translated_languages = self._get_translations()
@classmethod
def custom_font_path(cls) -> Path:
return Path('/usr/share/kbd/consolefonts/archinstall_font.psfu.gz')
@classmethod
def is_custom_font_enabled(cls) -> bool:
return cls.custom_font_path().exists()
@property
def translated_languages(self) -> List[Language]:
return self._translated_languages
def _get_translations(self) -> List[Language]:
"""
Load all translated languages and return a list of such
"""
mappings = self._load_language_mappings()
defined_languages = self._provided_translations()
languages = []
for short_form in defined_languages:
mapping_entry: Dict[str, Any] = next(filter(lambda x: x['abbr'] == short_form, mappings))
abbr = mapping_entry['abbr']
lang = mapping_entry['lang']
translated_lang = mapping_entry.get('translated_lang', None)
external_dep = mapping_entry.get('external_dep', False)
try:
# get a translation for a specific language
translation = gettext.translation('base', localedir=self._get_locales_dir(), languages=(abbr, lang))
# calculate the percentage of total translated text to total number of messages
if abbr == 'en':
percent = 100
else:
num_translations = self._get_catalog_size(translation)
percent = int((num_translations / self._total_messages) * 100)
# prevent cases where the .pot file is out of date and the percentage is above 100
percent = min(100, percent)
language = Language(abbr, lang, translation, percent, translated_lang, external_dep)
languages.append(language)
except FileNotFoundError as error:
raise TranslationError(f"Could not locate language file for '{lang}': {error}")
return languages
def _set_font(self, font: str):
"""
Set the provided font as the new terminal font
"""
from archinstall import SysCommand, log
try:
log(f'Setting font: {font}', level=logging.DEBUG)
SysCommand(f'setfont {font}')
except Exception:
log(f'Unable to set font {font}', level=logging.ERROR)
def _load_language_mappings(self) -> List[Dict[str, Any]]:
"""
Load the mapping table of all known languages
"""
locales_dir = self._get_locales_dir()
languages = Path.joinpath(locales_dir, self._languages)
with open(languages, 'r') as fp:
return json.load(fp)
def _get_catalog_size(self, translation: gettext.NullTranslations) -> int:
"""
Get the number of translated messages for a translations
"""
# this is a very naughty way of retrieving the data but
# there's no alternative method exposed unfortunately
catalog = translation._catalog # type: ignore
messages = {k: v for k, v in catalog.items() if k and v}
return len(messages)
def _get_total_active_messages(self) -> int:
"""
Get total messages that could be translated
"""
locales = self._get_locales_dir()
with open(f'{locales}/{self._base_pot}', 'r') as fp:
lines = fp.readlines()
msgid_lines = [line for line in lines if 'msgid' in line]
return len(msgid_lines) - 1 # don't count the first line which contains the metadata
def get_language_by_name(self, name: str) -> Language:
"""
Get a language object by it's name, e.g. English
"""
try:
return next(filter(lambda x: x.name_en == name, self._translated_languages))
except Exception:
raise ValueError(f'No language with name found: {name}')
def get_language_by_abbr(self, abbr: str) -> Language:
"""
Get a language object by its abbrevation, e.g. en
"""
try:
return next(filter(lambda x: x.abbr == abbr, self._translated_languages))
except Exception:
raise ValueError(f'No language with abbreviation "{abbr}" found')
def activate(self, language: Language):
"""
Set the provided language as the current translation
"""
language.translation.install()
def _get_locales_dir(self) -> Path:
"""
Get the locales directory path
"""
cur_path = Path(__file__).parent.parent
locales_dir = Path.joinpath(cur_path, 'locales')
return locales_dir
def _provided_translations(self) -> List[str]:
"""
Get a list of all known languages
"""
locales_dir = self._get_locales_dir()
filenames = os.listdir(locales_dir)
translation_files = []
for filename in filenames:
if len(filename) == 2 or filename == 'pt_BR':
translation_files.append(filename)
return translation_files
class DeferredTranslation:
def __init__(self, message: str):
self.message = message
def __len__(self) -> int:
return len(self.message)
def __str__(self) -> str:
translate = _
if translate is DeferredTranslation:
return self.message
return translate(self.message)
def __lt__(self, other) -> bool:
return self.message < other
def __gt__(self, other) -> bool:
return self.message > other
def __add__(self, other) -> DeferredTranslation:
if isinstance(other, str):
other = DeferredTranslation(other)
concat = self.message + other.message
return DeferredTranslation(concat)
def format(self, *args) -> str:
return self.message.format(*args)
@classmethod
def install(cls):
import builtins
builtins._ = cls
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