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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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This plugin enables a smarter way to translate a Lektor static website using old-good PO files. So you can use your beloved translation processes and tools.
See README.md

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# Lektor i18n plugin
This plugin enables a smarter way to translate a [Lektor](http://getlektor.com) static website using old-good PO files. So you can use your beloved translation processes and tools.
## Principles
The idea of this plugin is to capture the **sentences** or **paragraphs** from your **content** and **templates**, and populate a standard *Gettext* [PO file](https://www.gnu.org/software/gettext/manual/html_node/PO-Files.html). Using usual tools, user can translate these files, very easily. Then the plugin will merge the translations into new [_alternative_](https://www.getlektor.com/docs/content/alts/) content files, providing a translated website.
## Configuration
### Configuration file
#### `configs/i18n.ini`
content = en
translations = fr,es,it
i18npath = i18n
translate_paragraphwise = False
Where :
* `content` is the language used to write `contents.lr` files (default is `en`)
* `translations` is the list of target languages (you want to translate into).
* `i18npath` is the directory where translation files will be produced/stored (default is `i18n`). This directory needs to be relative to root path.
* `translate_paragraphwise` specifies whether translation strings are created per line or per paragraph. The latter is helpful for documents wrapping texts at 80 character boundaries. It is set to `False` by default.
#### `babel.cfg`
If you plan to localise your templates as well, you can use
`{{ _("some string") }}` in your templates. To make this work, pybabel should be installed (pip install pybabel; maybe pip3). A `babel.cfg` also has to exist in your project root with this content:
[jinja2: **/templates/**.html]
encoding = utf-8
extensions=jinja2.ext.autoescape,jinja2.ext.with_
### Translatable fields
In order for a field to be marked as translatable, an option has to be set in the field definition. Both blocks and flowblocks fields are subjects to translations.
in `flowblocks/*.ini` and/or `models/*.ini`, mark a field as translatable with :
[model]
name = Page
label = {{ this.title }}
[fields.title]
label = Title
type = string
translate = True
[fields.body]
label = Body
type = markdown
translate = True
Both `title` and `body` are now translatable. It means that during the parsing phase, all sentences from `title` or `body` fields from the `contents.lr` files with `Page` model will populate the collected PO file.
Another flowblock example:
[block]
name = Section Block
button_label = Section
[fields.title]
label = Title
type = string
translate = True
[fields.body]
label = Body
type = markdown
translate = True
[fields.image]
label = Image
type = select
source = record.attachments.images
[fields.image_position]
label = Image Position
type = select
choices = left, right
choice_labels = Left, Right
default = right
Here again, `body` and `title` will be translated. But `image` and `image_position` won't.
### Non-english content
Thanx to a limitation of msginit it's not so easy to translate a website with default language set to anything but english.
So if your default content language is not english, you will have to edit the first `contents-en.po` file and remove the translations (by hand ?)...
## Installation
### Prerequisites
#### Lektor
This plugin has been tested with `Lektor 3..0.x`.
#### GetText
Both Gettext and Pybabel are required. For a Debian/Ubuntu system, this means a simple :
sudo apt-get install gettext python3-babel
On macOS, use a decent package manager, like MacPorts or Homebrew. With Homebrew:
brew install gettext
and then pip to fetch pybabel:
pip install babel
### Installation
Very straightforward :
$ lektor plugins add lektor-i18n
Verify installation with a simple :
$ lektor plugins list
...
lektor-i18n (version 0.1)
...
## Usage
The translation mechanism is hooked into the build system. So translating a website just means building the website.
$ lektor build
On first call, a new `i18n` directory (can be changed in configuration file) will be created on top the lektor tree.
This directory will be populated with a single `contents.pot` file, compiling all the sentences found by the plugin. The list of fields eligible to translation is configured in the models/flows definition with `translate=True` added to each field.
For each translation language (still from the configuration file), a `content-<language>.po` file will be created/updated. These are the files that need to be translated with your prefered tool (like [POEdit](http://poedit.net) or [Transifex](http://transifex.com)).
All translation files (`contents-*.po`) are then compiled and merged with the original `contents.lr` files to produce all the `contents-<language>.lr` files in their respective directories.
Due to the way Lektor building system is designed, all these steps happen on every build. This means that sometime, after translating the `contents-*.po` files, it might be required to run the build system twice to see the translation appear in the final HTML files.
### Project file
It's still the user responsability to modify the project file in order to include the expected languages :
[alternatives.en]
name = English
primary = yes
locale = en_US
[alternatives.fr]
name = French
url_prefix = /fr/
locale = fr
See [Lektor Documentation](https://www.getlektor.com/docs/content/alts/) for more information.
## Support
This plugin is provided as-is by [NumeriCube](http://numericube.com) a human-sized Paris-based company prodiving tailored services to smart customers.
We will be happy to try to help you with this plugin if need. Just file an issue on our [GitHub account](https://gihub.com/numericube/lektor-i18n-plugin/).

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# -*- coding: utf-8 -*-
#pylint: disable=wrong-import-position
import sys
PY3 = sys.version_info > (3,)
import collections
import datetime
import gettext
import os
from os.path import relpath, join, exists, dirname
from pprint import PrettyPrinter
import re
import tempfile
import time
if PY3:
from urllib.parse import urljoin
else:
from urlparse import urljoin
from lektor.pluginsystem import Plugin
from lektor.db import Page
from lektor.metaformat import tokenize
from lektor.reporter import reporter
from lektor.types.flow import FlowType, process_flowblock_data
from lektor.utils import portable_popen, locate_executable
from lektor.environment import PRIMARY_ALT
from lektor.filecontents import FileContents
from lektor.context import get_ctx
command_re = re.compile(r'([a-zA-Z0-9.-_]+):\s*(.*?)?\s*$')
# derived from lektor.types.flow but allows more dash signs
block2re = re.compile(r'^###(#+)\s*([^#]*?)\s*###(#+)\s*$')
POT_HEADER = """msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\\n"
"Report-Msgid-Bugs-To: \\n"
"POT-Creation-Date: %(NOW)s\\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\\n"
"Language-Team: %(LANGUAGE)s <LL@li.org>\\n"
"Language: %(LANGUAGE)s\\n"
"MIME-Version: 1.0\\n"
"Content-Type: text/plain; charset=UTF-8\\n"
"Content-Transfer-Encoding: 8bit\\n"
"""
# python2/3 compatibility layer
encode = lambda s: (s if PY3 else s.encode('UTF-8'))
def trans(translator, s):
"""Thin gettext translation wrapper to allow compatibility with both Python2
and 3."""
if PY3:
return translator.gettext(s)
else:
return translator.ugettext(s)
def truncate(s, length=32):
return (s[:length] + '..') if len(s) > length else s
#pylint: disable=too-few-public-methods,redefined-variable-type
class TemplateTranslator(object):
def __init__(self, i18npath):
self.i18npath = i18npath
self.__lastlang = None
self.translator = None
self.init_translator()
def init_translator(self):
ctx = get_ctx()
if not ctx:
self.translator = gettext.GNUTranslations()
return super(TemplateTranslator, self).__init__()
if not self.__lastlang == ctx.locale:
self.__lastlang = ctx.locale
self.translator = gettext.translation("contents",
join(self.i18npath, '_compiled'),
languages=[ctx.locale], fallback=True)
def gettext(self, x):
self.init_translator() # lagnuage could have changed
return self.translator.gettext(x)
def ngettext(self, *x):
self.init_translator()
return self.translator.ngettext(*x)
class Translations():
"""Memory of translations"""
def __init__(self):
# dict like {'text' : ['source1', 'source2',...],}
self.translations = collections.OrderedDict()
def add(self, text, source):
if not text in self.translations.keys():
self.translations[text]=[]
reporter.report_debug_info('added to translation memory : ', truncate(text))
if not source in self.translations[text]:
self.translations[text].append(source)
def __repr__(self):
return PrettyPrinter(2).pformat(self.translations)
def as_pot(self, content_language):
"""returns a POT version of the translation dictionnary"""
now = datetime.datetime.now().strftime('%Y-%m-%d %H:%M')
now += '+%s'%(time.tzname[0])
result = POT_HEADER % {'LANGUAGE' : content_language, 'NOW' : now}
for msg, paths in self.translations.items():
result += "#: %s\n"%" ".join(paths)
for token, repl in {'\n': '\\n', '\t': '\\t', '"': '\\"'}.items():
msg = msg.replace(token, repl)
result+='msgid "%s"\n' % msg
result+='msgstr ""\n\n'
return result
def write_pot(self, pot_filename, language):
if not os.path.exists(os.path.dirname(pot_filename)):
os.makedirs(os.path.dirname(pot_filename))
with open(pot_filename,'w') as f:
f.write(encode(self.as_pot(language)))
def merge_pot(self, from_filenames, to_filename):
msgcat=locate_executable('msgcat')
cmdline=[msgcat, "--use-first"]
cmdline.extend(from_filenames)
cmdline.extend(("-o", to_filename))
reporter.report_debug_info('msgcat cmd line', cmdline)
portable_popen(cmdline).wait()
def parse_templates(self, to_filename):
pybabel=locate_executable('pybabel')
cmdline=[pybabel, 'extract', '-F', 'babel.cfg', "-o", to_filename, "./"]
reporter.report_debug_info('pybabel cmd line', cmdline)
portable_popen(cmdline).wait()
translations = Translations() # let's have a singleton
class POFile():
FILENAME_PATTERN = "contents+%s.po"
def __init__(self, language, i18npath):
self.language=language
self.i18npath=i18npath
def _exists(self):
"""Returns True if <language>.po file exists in i18npath"""
filename=self.FILENAME_PATTERN%self.language
return exists( join(self.i18npath, filename) )
def _msg_init(self):
"""Generates the first <language>.po file"""
msginit=locate_executable('msginit')
cmdline=[msginit, "-i", "contents.pot", "-l", self.language, "-o", self.FILENAME_PATTERN%self.language, "--no-translator"]
reporter.report_debug_info('msginit cmd line', cmdline)
portable_popen(cmdline, cwd=self.i18npath).wait()
def _msg_merge(self):
"""Merges an existing <language>.po file with .pot file"""
msgmerge=locate_executable('msgmerge')
cmdline=[msgmerge, self.FILENAME_PATTERN%self.language, "contents.pot", "-U", "-N", "--backup=simple"]
reporter.report_debug_info('msgmerge cmd line', cmdline)
portable_popen(cmdline, cwd=self.i18npath).wait()
def _prepare_locale_dir(self):
"""Prepares the i18n/<language>/LC_MESSAGES/ to store the .mo file ; returns the dirname"""
directory = join('_compiled',self.language, "LC_MESSAGES")
try:
os.makedirs(join(self.i18npath, directory))
except OSError:
pass # already exists, no big deal
return directory
def _msg_fmt(self, locale_dirname):
"""Compile an existing <language>.po file into a .mo file"""
msgfmt=locate_executable('msgfmt')
cmdline=[msgfmt, self.FILENAME_PATTERN%self.language, "-o", join(locale_dirname,"contents.mo")]
reporter.report_debug_info('msgfmt cmd line', cmdline)
portable_popen(cmdline, cwd=self.i18npath).wait()
def generate(self):
if self._exists():
self._msg_merge()
else:
self._msg_init()
locale_dirname=self._prepare_locale_dir()
self._msg_fmt(locale_dirname)
def line_starts_new_block(line, prev_line):
"""Detect a new block in a lektor document. Blocks are delimited by a line
containing 3 or more dashes. This actually matches the definition of a
markdown level 2 heading, so this function returns False if no colon was
found in the line before, so if it isn't a new block with a key: value pair
before."""
if not prev_line or ':' not in prev_line:
return False # could be a markdown heading
line = line.strip()
return line == u'-' * len(line) and len(line) >= 3
def split_paragraphs(document):
if isinstance(document, (list, tuple)):
document = ''.join(document) # list of lines
return re.split('\n(?:\\s*\n){1,}', document)
# We cannot check for unused arguments here, they're mandated by the plugin API.
#pylint:disable=unused-argument
class I18NPlugin(Plugin):
name = u'i18n'
description = u'Internationalisation helper'
#pylint: disable=attribute-defined-outside-init
def on_setup_env(self):
"""Setup `env` for the plugin"""
# Read configuration
self.enabled = self.get_config().get('enable', 'true') in ('true','True','1')
if not self.enabled:
reporter.report_generic('I18N plugin disabled in configs/i18n.ini')
self.i18npath = self.get_config().get('i18npath', 'i18n')
self.url_prefix = self.get_config().get('url_prefix', 'http://localhost/')
# whether or not to use a pargraph as smallest translatable unit
self.trans_parwise = self.get_config().get('translate_paragraphwise',
'false') in ('true','True','1')
self.content_language=self.get_config().get('content', 'en')
self.env.jinja_env.add_extension('jinja2.ext.i18n')
self.env.jinja_env.policies['ext.i18n.trimmed'] = True # do a .strip()
self.env.jinja_env.install_gettext_translations(TemplateTranslator(self.i18npath))
# ToDo: is this stil required
try:
self.translations_languages=self.get_config().get('translations').replace(' ','').split(',')
except AttributeError:
raise RuntimeError('Please specify the "translations" configuration option in configs/i18n.ini')
if not self.content_language in self.translations_languages:
self.translations_languages.append(self.content_language)
def process_node(self, fields, sections, source, zone, root_path):
"""For a give node (), identify all fields to translate, and add new
fields to translations memory. Flow blocks are handled recursively."""
for field in fields:
if ('translate' in field.options) \
and (source.alt in (PRIMARY_ALT, self.content_language)) \
and (field.options['translate'] in ('True', 'true', '1', 1)):
if field.name in sections.keys():
section = sections[field.name]
# if blockwise, each paragraph is one translatable message,
# otherwise each line
chunks = (split_paragraphs(section) if self.trans_parwise
else [x.strip() for x in section if x.strip()])
for chunk in chunks:
translations.add(chunk.strip('\r\n'),
"%s (%s:%s.%s)" % (
urljoin(self.url_prefix, source.url_path),
relpath(source.source_filename, root_path),
zone, field.name)
)
if isinstance(field.type, FlowType):
if sections.has_key(field.name):
section = sections[field.name]
for blockname, blockvalue in process_flowblock_data("".join(section)):
flowblockmodel = source.pad.db.flowblocks[blockname]
blockcontent=dict(tokenize(blockvalue))
self.process_node(flowblockmodel.fields, blockcontent, source, blockname, root_path)
def __parse_source_structure(self, lines):
"""Parse structure of source file. In short, there are two types of
chunks: those which need to be translated ('translatable') and those
which don't ('raw'). "title: test" could be split into:
[('raw': 'title: ',), ('translatable', 'test')]
NOTE: There is no guarantee that multiple raw blocks couldn't occur and
in fact due to implementation details, this actually happens."""
blocks = []
count_lines_block = 0 # counting the number of lines of the current block
is_content = False
prev_line = None
for line in lines:
stripped_line = line.strip()
if not stripped_line: # empty line
blocks.append(('raw', '\n'))
continue
# line like "---*" or a new block tag
if line_starts_new_block(stripped_line, prev_line) or \
block2re.search(stripped_line):
count_lines_block=0
is_content = False
blocks.append(('raw', line))
else:
count_lines_block+=1
match = command_re.search(stripped_line)
if count_lines_block==1 and not is_content and match: # handle first line, while not in content
key, value = match.groups()
blocks.append(('raw', encode(key) + ':'))
if value:
blocks.append(('raw', ' '))
blocks.append(('translatable', encode(value)))
blocks.append(('raw', '\n'))
else:
is_content=True
if is_content:
blocks.append(('translatable', line))
prev_line = line
# join neighbour blocks of same type
newblocks = []
for type, data in blocks:
if len(newblocks) > 0 and newblocks[-1][0] == type: # same type, merge
newblocks[-1][1] += data
else:
newblocks.append([type, data])
return newblocks
def on_before_build(self, builder, build_state, source, prog):
"""Before building a page, produce all its alternatives (=translated pages)
using the gettext translations available."""
if self.enabled and isinstance(source,Page) and source.alt in (PRIMARY_ALT, self.content_language):
contents = None
for fn in source.iter_source_filenames():
try:
contents=FileContents(fn)
except IOError:
pass # next
for language in self.translations_languages:
translator = gettext.translation("contents",
join(self.i18npath,'_compiled'), languages=[language], fallback = True)
translated_filename = join(dirname(source.source_filename),
"contents+%s.lr"%language)
with contents.open(encoding='utf-8') as file:
chunks = self.__parse_source_structure(file.readlines())
with open(translated_filename,"w") as f:
for type, content in chunks: # see __parse_source_structure
if type == 'raw':
f.write(content)
elif type == 'translatable':
if self.trans_parwise: # translate per paragraph
f.write(self.__trans_parwise(content,
translator))
else:
f.write(self.__trans_linewise(content,
translator))
else:
raise RuntimeError("Unknown chunk type detected, this is a bug")
def __trans_linewise(self, content, translator):
"""Translate the chunk linewise."""
lines = []
for line in content.split('\n'):
line_stripped = line.strip()
trans_stripline = trans(translator, line_stripped) # trnanslate the stripped version
# and re-inject the stripped translation into original line (not stripped)
lines.append(line.replace(line_stripped,
trans_stripline, 1))
return '\n'.join(lines)
def __trans_parwise(self, content, translator):
"""Extract translatable strings block-wise, query for translation of
block and re-inject result."""
result = []
for paragraph in split_paragraphs(content):
stripped = paragraph.strip('\n\r')
paragraph = paragraph.replace(stripped, trans(translator,
stripped))
result.append(paragraph)
return '\n\n'.join(result)
def on_after_build(self, builder, build_state, source, prog):
if self.enabled and isinstance(source,Page):
try:
text = source.contents.as_text()
except IOError:
pass
else:
fields = source.datamodel.fields
sections = dict(tokenize(text.splitlines())) # {'sectionname':[list of section texts]}
self.process_node(fields, sections, source, source.datamodel.id, builder.env.root_path)
def on_before_build_all(self, builder, **extra):
if self.enabled:
reporter.report_generic("i18n activated, with main language %s"% self.content_language )
templates_pot_filename = join(tempfile.gettempdir(), 'templates.pot')
reporter.report_generic("Parsing templates for i18n into %s" \
% relpath(templates_pot_filename, builder.env.root_path))
translations.parse_templates(templates_pot_filename)
def on_after_build_all(self, builder, **extra):
"""Once the build process is over :
- write the translation template `contents.pot` on the filesystem,
- write all translation contents+<language>.po files """
if not self.enabled:
return
contents_pot_filename = join(builder.env.root_path, self.i18npath, 'contents.pot')
pots = [contents_pot_filename,
join(tempfile.gettempdir(), 'templates.pot'),
join(builder.env.root_path, self.i18npath, 'plugins.pot')]
# write out contents.pot from web site contents
translations.write_pot(pots[0], self.content_language)
reporter.report_generic("%s generated" % relpath(pots[0],
builder.env.root_path))
pots = [p for p in pots if os.path.exists(p) ] # only keep existing ones
if len(pots) > 1:
translations.merge_pot(pots, contents_pot_filename)
reporter.report_generic("Merged POT files %s" % ', '.join(
relpath(p, builder.env.root_path) for p in pots))
for language in self.translations_languages:
po_file=POFile(language, self.i18npath)
po_file.generate()

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from setuptools import setup
setup(
name='lektor-i18n',
version='0.2',
author=u'NumeriCube',
author_email='support@numericube.com',
url='https://github.com/numericube/lektor-i18n-plugin',
license='GPL',
py_modules=['lektor_i18n'],
entry_points={
'lektor.plugins': [
'i18n = lektor_i18n:I18NPlugin',
]
}
)