Add locale.getlocale()

This returns the localization of the running CircuitPython, such as
en_US, fr, etc.

Additional changes are needed in build infrastructure since the
string "en_US" should not appear to be translated in weblate, ever;
instead the value comes from the translation metadata.

Closes: #8602

Makefile

@@ -227,7 +227,7 @@ pseudoxml:
 all-source:
 
 locale/circuitpython.pot: all-source
-	find $(TRANSLATE_SOURCES) -type d \( $(TRANSLATE_SOURCES_EXC) \) -prune -o -type f \( -iname "*.c" -o -iname "*.h" \) -print | (LC_ALL=C sort) | xgettext -f- -L C -s --add-location=file --keyword=MP_ERROR_TEXT -o - | sed -e '/"POT-Creation-Date: /d' > $@
+	find $(TRANSLATE_SOURCES) -type d \( $(TRANSLATE_SOURCES_EXC) \) -prune -o -type f \( -iname "*.c" -o -iname "*.h" \) -print | (LC_ALL=C sort) | xgettext -x locale/synthetic.po -f- -L C -s --add-location=file --keyword=MP_ERROR_TEXT -o - | sed -e '/"POT-Creation-Date: /d' > $@
 
 # Historically, `make translate` updated the .pot file and ran msgmerge.
 # However, this was a frequent source of merge conflicts.  Weblate can perform

locale/synthetic.po

@@ -0,0 +1,3 @@
+# Localization of the locale name is done automagically
+msgid "en_US"
+msgstr ""

ports/unix/variants/coverage/mpconfigvariant.mk

@@ -33,6 +33,7 @@ SRC_BITMAP := \
 	shared-bindings/audiomixer/MixerVoice.c \
 	shared-bindings/bitmaptools/__init__.c \
 	shared-bindings/displayio/Bitmap.c \
+	shared-bindings/locale/__init__.c \
 	shared-bindings/rainbowio/__init__.c \
 	shared-bindings/struct/__init__.c \
 	shared-bindings/synthio/__init__.c \
@@ -82,6 +83,7 @@ CFLAGS += \
 	-DCIRCUITPY_DISPLAYIO_UNIX=1 \
 	-DCIRCUITPY_FUTURE=1 \
 	-DCIRCUITPY_GIFIO=1 \
+	-DCIRCUITPY_LOCALE=1 \
 	-DCIRCUITPY_OS_GETENV=1 \
 	-DCIRCUITPY_RAINBOWIO=1 \
 	-DCIRCUITPY_STRUCT=1 \

py/circuitpy_defns.mk

@@ -239,6 +239,9 @@ endif
 ifeq ($(CIRCUITPY_KEYPAD),1)
 SRC_PATTERNS += keypad/%
 endif
+ifeq ($(CIRCUITPY_LOCALE),1)
+SRC_PATTERNS += locale/%
+endif
 ifeq ($(CIRCUITPY_MATH),1)
 SRC_PATTERNS += math/%
 endif
@@ -544,6 +547,7 @@ $(filter $(SRC_PATTERNS), \
 	displayio/Colorspace.c \
 	fontio/Glyph.c \
 	imagecapture/ParallelImageCapture.c \
+	locale/__init__.c \
 	math/__init__.c \
 	microcontroller/ResetReason.c \
 	microcontroller/RunMode.c \

py/circuitpy_mpconfig.mk

@@ -320,6 +320,9 @@ CFLAGS += -DCIRCUITPY_KEYPAD_KEYMATRIX=$(CIRCUITPY_KEYPAD_KEYMATRIX)
 CIRCUITPY_KEYPAD_SHIFTREGISTERKEYS ?= $(CIRCUITPY_KEYPAD)
 CFLAGS += -DCIRCUITPY_KEYPAD_SHIFTREGISTERKEYS=$(CIRCUITPY_KEYPAD_SHIFTREGISTERKEYS)
 
+CIRCUITPY_LOCALE ?= $(CIRCUITPY_FULL_BUILD)
+CFLAGS += -DCIRCUITPY_LOCALE=$(CIRCUITPY_LOCALE)
+
 CIRCUITPY_MATH ?= 1
 CFLAGS += -DCIRCUITPY_MATH=$(CIRCUITPY_MATH)
 

py/maketranslationdata.py

@@ -92,7 +92,10 @@ def translate(translation_file, i18ns):
             unescaped = original
             for s in C_ESCAPES:
                 unescaped = unescaped.replace(C_ESCAPES[s], s)
-            translation = table.gettext(unescaped)
+            if original == "en_US":
+                translation = table.info()["language"]
+            else:
+                translation = table.gettext(unescaped)
             # Add in carriage returns to work in terminals
             translation = translation.replace("\n", "\r\n")
             translations.append((original, translation))

shared-bindings/locale/__init__.c

@@ -0,0 +1,62 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2023 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "py/objtuple.h"
+
+//| def getlocale(path: str, times: Tuple[int, int]) -> None:
+//|     """Change the timestamp of a file."""
+//|     ...
+//|
+STATIC mp_obj_t getlocale(void) {
+
+    mp_rom_error_text_t locale_msg = MP_ERROR_TEXT("en_US");
+    size_t len_with_nul = decompress_length(locale_msg);
+    size_t len = len_with_nul - 1;
+    char buf[len_with_nul];
+    decompress(locale_msg, buf);
+
+    mp_obj_t elements[] = {
+        mp_obj_new_str(buf, len),
+        MP_OBJ_NEW_QSTR(MP_QSTR_utf_hyphen_8)
+    };
+    return mp_obj_new_tuple(MP_ARRAY_SIZE(elements), elements);
+}
+MP_DEFINE_CONST_FUN_OBJ_0(getlocale_obj, getlocale);
+
+STATIC const mp_rom_map_elem_t locale_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_locale) },
+    { MP_ROM_QSTR(MP_QSTR_getlocale), MP_ROM_PTR(&getlocale_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(locale_module_globals, locale_module_globals_table);
+
+const mp_obj_module_t locale_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t *)&locale_module_globals,
+};
+
+MP_REGISTER_MODULE(MP_QSTR_locale, locale_module);

tools/check_translations.py

@@ -13,8 +13,10 @@ import polib
 template_filename = sys.argv[1]
 po_filenames = sys.argv[2:]
 
+synthetic = polib.pofile("locale/synthetic.po")
+synthetic_ids = set([x.msgid for x in synthetic])
 template = polib.pofile(template_filename)
-all_ids = set([x.msgid for x in template])
+all_ids = set([x.msgid for x in template]) - synthetic_ids
 for po_filename in po_filenames:
     print("Checking", po_filename)
     po_file = polib.pofile(po_filename)