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Linux locales detection: reject unexpected formatting

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This commit is contained in:
Lukas Matena 2020-12-14 22:58:28 +01:00
parent b9bdfd26e3
commit acb7d66577
1 changed files with 21 additions and 6 deletions
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27
src/slic3r/GUI/GUI_App.cpp
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@ -10,6 +10,7 @@
#include <iterator>
#include <exception>
#include <cstdlib>
#include <regex>
#include <boost/algorithm/string.hpp>
#include <boost/format.hpp>
#include <boost/lexical_cast.hpp>
@ -1272,7 +1273,7 @@ bool GUI_App::switch_language()
}
}
#ifdef __linux
#ifdef __linux__
static const wxLanguageInfo* linux_get_existing_locale_language(const wxLanguageInfo* language,
const wxLanguageInfo* system_language)
{
@ -1281,6 +1282,9 @@ static const wxLanguageInfo* linux_get_existing_locale_language(const wxLanguage
std::vector<std::string> locales;
const std::string lang_prefix = into_u8(language->CanonicalName.BeforeFirst('_'));
// Call locale -a so we can parse the output to get the list of available locales
// We expect lines such as "en_US.utf8". Pick ones starting with the language code
// we are switching to. Lines with different formatting will be removed later.
FILE* fp = popen("locale -a", "r");
if (fp != NULL) {
while (fgets(path, max_len, fp) != NULL) {
@ -1303,19 +1307,30 @@ static const wxLanguageInfo* linux_get_existing_locale_language(const wxLanguage
return ! has_utf8(a) && has_utf8(b);
});
// Remove the suffix.
// Remove the suffix behind a dot, if there is one.
for (std::string& s : locales)
s = s.substr(0, s.find("."));
// We just hope that dear Linux "locale -a" returns country codes
// in ISO 3166-1 alpha-2 code (two letter) format.
// https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes
// To be sure, remove anything not looking as expected
// (any number of lowercase letters, underscore, two uppercase letters).
locales.erase(std::remove_if(locales.begin(),
locales.end(),
[](const std::string& s) {
return ! std::regex_match(s,
std::regex("^[a-z]+_[A-Z]{2}$"));
}),
locales.end());
// Is there a candidate matching a country code of a system language? Move it to the end,
// while maintaining the order of matches, so that the best match ends up at the very end.
// We just hope that dear Linux "locale -a" returns country codes in ISO 3166-1 alpha-2 code (two letter) format.
// https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes
std::string system_country = "_" + into_u8(system_language->CanonicalName.AfterFirst('_')).substr(0, 2);
int cnt = locales.size();
for (int i=0; i<cnt; ++i)
if (locales[i].find(system_country) != std::string::npos) {
locales.emplace_back(std::move[locales[i]]);
locales.emplace_back(std::move(locales[i]));
locales[i].clear();
}
@ -1323,7 +1338,7 @@ static const wxLanguageInfo* linux_get_existing_locale_language(const wxLanguage
for (auto it = locales.rbegin(); it != locales.rend(); ++ it)
if (! it->empty()) {
const std::string &locale = *it;
const wxLanguageInfo* lang = wxLocale::FindLanguageInfo(locale.substr(0, locale.find(".")));
const wxLanguageInfo* lang = wxLocale::FindLanguageInfo(from_u8(locale));
if (wxLocale::IsAvailable(lang->Language))
return lang;
}