internationalize using Babel

this commit also makes the sdist tarball generated by setuptools REUSE-compliant

5 files changed, 128 insertions, 53 deletions

diff --git a/src/hydrilla/builder/__main__.py b/src/hydrilla/builder/__main__.py
index e60c50d..87dc9e2 100644
--- a/src/hydrilla/builder/__main__.py
+++ b/src/hydrilla/builder/__main__.py
@@ -1,50 +1,9 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: CC0-1.0
 
-# Command line interface of Hydrilla package builder.
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
 #
-# This file is part of Hydrilla
-#
-# Copyright (C) 2022 Wojtek Kosior
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as
-# published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-#
-#
-# I, Wojtek Kosior, thereby promise not to sue for violation of this
-# file's license. Although I request that you do not make use this code
-# in a proprietary program, I am not going to enforce this in court.
-
-from pathlib import Path
-
-import click
-
-from .build import Build
-
-dir_type = click.Path(exists=True, file_okay=False, resolve_path=True)
+# Available under the terms of Creative Commons Zero v1.0 Universal.
 
-@click.command()
-@click.option('-s', '--srcdir', default='./', type=dir_type, show_default=True,
-              help='Source directory to build from.')
-@click.option('-i', '--index-json', default='index.json', type=click.Path(),
-              help='Path to file to be processed instead of index.json (if not absolute, resolved relative to srcdir).')
-@click.option('-d', '--dstdir', type=dir_type, required=True,
-              help='Destination directory to write built package files to.')
-def preform_build(srcdir, index_json, dstdir):
-    """
-    Build Hydrilla package from scrdir and write the resulting files under
-    dstdir.
-    """
-    build = Build(Path(srcdir), Path(index_json))
-    build.write_package_files(Path(dstdir))
+from . import build
 
-preform_build()
+build.perform()
diff --git a/src/hydrilla/builder/build.py b/src/hydrilla/builder/build.py
index cdbfad3..8d25b19 100644
--- a/src/hydrilla/builder/build.py
+++ b/src/hydrilla/builder/build.py
@@ -32,9 +32,12 @@ from hashlib import sha256
 from sys import stderr
 
 import jsonschema
+import click
 
 from .. import util
 
+_ = util.get_gettext('hydrilla_builder')
+
 index_validator = util.validator_for('package_source-1.schema.json')
 
 class FileReferenceError(Exception):
@@ -99,12 +102,12 @@ def generate_spdx_report(root):
     try:
         from reuse._main import main as reuse_main
     except ModuleNotFoundError:
-        ReuseError("Could not import 'reuse'. Is the tool installed and visible to this Python instance?")
+        ReuseError(_('couldnt_import_reuse_is_it_installed'))
 
     mocked_output = FileBuffer()
     if reuse_main(args=['--root', str(root), 'lint'], out=mocked_output) != 0:
         stderr.write(mocked_output.get_bytes().decode())
-        raise ReuseError('Attempt to generate an SPDX report for a REUSE-incompliant package.')
+        raise ReuseError(_('spdx_report_from_reuse_incompliant'))
 
     mocked_output = FileBuffer()
     if reuse_main(args=['--root', str(root), 'spdx'], out=mocked_output) != 0:
@@ -188,10 +191,11 @@ class Build:
 
         path = path.resolve()
         if not path.is_relative_to(self.srcdir):
-            raise FileReferenceError(f"Attempt to load '{filename}' which lies outside package source directory.")
+            raise FileReferenceError(_('loading_{}_outside_package_dir')
+                                     .format(filename))
 
         if str(path.relative_to(self.srcdir)) == 'index.json':
-            raise FileReferenceError("Attempt to load 'index.json' which is a reserved filename.")
+            raise FileReferenceError(_('loading_reserved_index_json'))
 
         file_ref = self.files_by_path.get(path)
         if file_ref is None:
@@ -305,7 +309,7 @@ class Build:
             [self._process_file(f['file']) for f in index_obj['copyright']]
 
         if generate_spdx and not spdx_ref.include_in_distribution:
-            raise FileReferenceError("Told to generate 'report.spdx' but 'report.spdx' is not listed among copyright files. Refusing to proceed.")
+            raise FileReferenceError(_('report_spdx_not_in_copyright_list'))
 
         item_refs = [self._process_item(d) for d in index_obj['definitions']]
 
@@ -373,3 +377,20 @@ class Build:
                 version = '.'.join([str(n) for n in item_def['version']])
                 with open(item_dir_path / version, 'wt') as output:
                     json.dump(item_def, output)
+
+dir_type = click.Path(exists=True, file_okay=False, resolve_path=True)
+
+@click.option('-s', '--srcdir', default='./', type=dir_type, show_default=True,
+              help=_('source_directory_to_build_from'))
+@click.option('-i', '--index-json', default='index.json', type=click.Path(),
+              help=_('path_instead_of_index_json'))
+@click.option('-d', '--dstdir', type=dir_type, required=True,
+              help=_('built_package_files_destination'))
+def perform(srcdir, index_json, dstdir):
+    """<this will be replaced by a localized docstring for Click to pick up>"""
+    build = Build(Path(srcdir), Path(index_json))
+    build.write_package_files(Path(dstdir))
+
+perform.__doc__ = _('build_package_from_srcdir_to_dstdir')
+
+perform = click.command()(perform)
diff --git a/src/hydrilla/locales/en_US/LC_MESSAGES/hydrilla_builder.po b/src/hydrilla/locales/en_US/LC_MESSAGES/hydrilla_builder.po
new file mode 100644
index 0000000..2d351d6
--- /dev/null
+++ b/src/hydrilla/locales/en_US/LC_MESSAGES/hydrilla_builder.po
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: CC0-1.0
+#
+# English (United States) translations for hydrilla.builder.
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+msgid ""
+msgstr ""
+"Project-Id-Version: hydrilla.builder 0.1.dev16+g4e46d7f.d20220211\n"
+"Report-Msgid-Bugs-To: koszko@koszko.org\n"
+"POT-Creation-Date: 2022-02-12 10:49+0100\n"
+"PO-Revision-Date: 2022-02-12\n"
+"Last-Translator: Wojtek Kosior <koszko@koszko.org>\n"
+"Language: en_US\n"
+"Language-Team: en_US <koszko@koszko.org>\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.8.0\n"
+
+#: src/hydrilla/builder/build.py:105
+msgid "couldnt_import_reuse_is_it_installed"
+msgstr ""
+"Could not import 'reuse'. Is the tool installed and visible to this "
+"Python instance?"
+
+#: src/hydrilla/builder/build.py:110
+msgid "spdx_report_from_reuse_incompliant"
+msgstr "Attempt to generate an SPDX report for a REUSE-incompliant package."
+
+#: src/hydrilla/builder/build.py:194
+msgid "loading_{}_outside_package_dir"
+msgstr "Attempt to load '{}' which lies outside package source directory."
+
+#: src/hydrilla/builder/build.py:198
+msgid "loading_reserved_index_json"
+msgstr "Attempt to load 'index.json' which is a reserved filename."
+
+#: src/hydrilla/builder/build.py:312
+msgid "report_spdx_not_in_copyright_list"
+msgstr ""
+"Told to generate 'report.spdx' but 'report.spdx' is not listed among "
+"copyright files. Refusing to proceed."
+
+#: src/hydrilla/builder/build.py:384
+msgid "source_directory_to_build_from"
+msgstr "Source directory to build from."
+
+#: src/hydrilla/builder/build.py:386
+msgid "path_instead_of_index_json"
+msgstr ""
+"Path to file to be processed instead of index.json (if not absolute, "
+"resolved relative to srcdir)."
+
+#: src/hydrilla/builder/build.py:388
+msgid "built_package_files_destination"
+msgstr "Destination directory to write built package files to."
+
+#: src/hydrilla/builder/build.py:394
+msgid "build_package_from_srcdir_to_dstdir"
+msgstr ""
+"Build Hydrilla package from `scrdir` and write the resulting files "
+"under `dstdir`."
+
+#: src/hydrilla/util/_util.py:76
+msgid "bad_comment"
+msgstr "bad comment"
diff --git a/src/hydrilla/util/__init__.py b/src/hydrilla/util/__init__.py
index 2a69e0d..3a13831 100644
--- a/src/hydrilla/util/__init__.py
+++ b/src/hydrilla/util/__init__.py
@@ -5,4 +5,4 @@
 # Available under the terms of Creative Commons Zero v1.0 Universal.
 
 from ._util import strip_json_comments, normalize_version, parse_version, \
-    version_string, validator_for
+    version_string, validator_for, get_gettext
diff --git a/src/hydrilla/util/_util.py b/src/hydrilla/util/_util.py
index 9bebdc1..c7e9f47 100644
--- a/src/hydrilla/util/_util.py
+++ b/src/hydrilla/util/_util.py
@@ -26,6 +26,8 @@
 
 import re
 import json
+import locale
+import gettext
 
 from pathlib import Path
 from typing import Optional
@@ -71,7 +73,7 @@ def strip_json_comments(text: str) -> str:
             # ignore this error, let json module report it
             stripped = line
         elif len(match[2]) == 1:
-            raise json.JSONDecodeError('bad comment', text,
+            raise json.JSONDecodeError(_('bad_comment'), text,
                                        processed + len(match[1]))
         else:
             stripped = match[1]
@@ -127,3 +129,29 @@ def validator_for(schema_filename: str) -> Draft7Validator:
     """
     return Draft7Validator(resolver.resolve(schema_filename)[1],
                            resolver=resolver)
+
+def get_gettext(domain: str, lang: Optional[str]=None):
+    """
+    Configure translation and return its gettext() function.
+
+    If `lang` is set, look for translations for `lang`. Otherwise, try to
+    determine system's default language and use that.
+    """
+    # https://stackoverflow.com/questions/3425294/how-to-detect-the-os-default-language-in-python
+    # But I am not going to surrender to Microbugs' nonfree, crappy OS to test
+    # it, to the lines inside try: may fail.
+    try:
+        from ctypes.windll import kernel32 as windll
+        lang = locale.windows_locale[windll.GetUserDefaultUILanguage()]
+    except:
+        lang = locale.getdefaultlocale()[0] or 'C'
+
+    translation = gettext.translation(
+        domain,
+        localedir=(here.parent / 'locales'),
+        languages=[lang, 'en_US']
+    )
+
+    return translation.gettext
+
+_ = get_gettext('hydrilla_builder')