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89 lines
4 KiB
Rust
89 lines
4 KiB
Rust
// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#![allow(clippy::let_unit_value)]
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#![cfg(target_os = "macos")]
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use libc::{setlocale, LC_CTYPE};
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use std::env;
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use std::ffi::{CStr, CString};
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use std::os::raw::c_char;
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use std::ptr::null;
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use std::slice;
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use std::str;
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use objc::runtime::{Class, Object};
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pub fn set_locale_environment() {
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let locale_id = unsafe {
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let locale_class = Class::get("NSLocale").unwrap();
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let locale: *const Object = msg_send![locale_class, currentLocale];
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let _: () = msg_send![locale_class, release];
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// `localeIdentifier` returns extra metadata with the locale (including currency and
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// collator) on newer versions of macOS. This is not a valid locale, so we use
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// `languageCode` and `countryCode`, if they're available (macOS 10.12+):
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// https://developer.apple.com/documentation/foundation/nslocale/1416263-localeidentifier?language=objc
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// https://developer.apple.com/documentation/foundation/nslocale/1643060-countrycode?language=objc
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// https://developer.apple.com/documentation/foundation/nslocale/1643026-languagecode?language=objc
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let is_language_code_supported: bool =
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msg_send![locale, respondsToSelector: sel!(languageCode)];
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let is_country_code_supported: bool =
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msg_send![locale, respondsToSelector: sel!(countryCode)];
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let locale_id = if is_language_code_supported && is_country_code_supported {
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let language_code: *const Object = msg_send![locale, languageCode];
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let country_code: *const Object = msg_send![locale, countryCode];
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let language_code_str = nsstring_as_str(language_code).to_owned();
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let _: () = msg_send![language_code, release];
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let country_code_str = nsstring_as_str(country_code).to_owned();
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let _: () = msg_send![country_code, release];
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format!("{}_{}.UTF-8", &language_code_str, &country_code_str)
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} else {
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let identifier: *const Object = msg_send![locale, localeIdentifier];
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let identifier_str = nsstring_as_str(identifier).to_owned();
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let _: () = msg_send![identifier, release];
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identifier_str + ".UTF-8"
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};
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let _: () = msg_send![locale, release];
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locale_id
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};
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// check if locale_id is valid
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let locale_c_str = CString::new(locale_id.to_owned()).unwrap();
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let locale_ptr = locale_c_str.as_ptr();
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let locale_id = unsafe {
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// save a copy of original setting
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let original = setlocale(LC_CTYPE, null());
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let saved_original = if original.is_null() {
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CString::new("").unwrap()
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} else {
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CStr::from_ptr(original).to_owned()
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};
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// try setting `locale_id`
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let modified = setlocale(LC_CTYPE, locale_ptr);
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let result = if modified.is_null() { String::new() } else { locale_id };
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// restore original setting
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setlocale(LC_CTYPE, saved_original.as_ptr());
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result
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};
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env::set_var("LANG", &locale_id);
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}
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const UTF8_ENCODING: usize = 4;
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unsafe fn nsstring_as_str<'a>(nsstring: *const Object) -> &'a str {
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let cstr: *const c_char = msg_send![nsstring, UTF8String];
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let len: usize = msg_send![nsstring, lengthOfBytesUsingEncoding: UTF8_ENCODING];
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str::from_utf8(slice::from_raw_parts(cstr as *const u8, len)).unwrap()
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}
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#[cfg(not(target_os = "macos"))]
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pub fn set_locale_environment() {}
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