gettext.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#pragma once
 
#include "config.h" // for USE_GETTEXT
#include "porting.h"
#include "util/string.h"
 
#if USE_GETTEXT
        #include <libintl.h>
#else
        // In certain environments, some standard headers like <iomanip>
        // and <locale> include libintl.h. If libintl.h is included after
        // we define our gettext macro below, this causes a syntax error
        // at the declaration of the gettext function in libintl.h.
        // Fix this by including such a header before defining the macro.
        // See issue #4446.
        // Note that we can't include libintl.h directly since we're in
        // the USE_GETTEXT=0 case and can't assume that gettext is installed.
        #include <locale>
 
        #define gettext(String) (String)
        #define ngettext(String1, String2, n) ((n) == 1 ? (String1) : (String2))
#endif
 
#define _(String) gettext(String)
#define gettext_noop(String) (String)
#define N_(String) gettext_noop((String))
 
void init_gettext(const char *path, const std::string &configured_language,
        int argc, char *argv[]);
 
inline std::string strgettext(const char *str)
{
        // We must check here that is not an empty string to avoid trying to translate it
        return str[0] ? gettext(str) : "";
}
 
inline std::string strgettext(const std::string &str)
{
        return strgettext(str.c_str());
}
 
inline std::wstring wstrgettext(const char *str)
{
        return utf8_to_wide(strgettext(str));
}
 
inline std::wstring wstrgettext(const std::string &str)
{
        return wstrgettext(str.c_str());
}
 
template <typename ...Args>
inline std::wstring fwgettext(const char *src, Args&&... args)
{
        wchar_t buf[255];
        swprintf(buf, sizeof(buf) / sizeof(wchar_t), wstrgettext(src).c_str(),
                        std::forward<Args>(args)...);
        return std::wstring(buf);
}
 
template <typename ...Args>
inline std::string fmtgettext(const char *format, Args&&... args)
{
        format = gettext(format);
 
        std::string buf;
        {
                size_t default_size = strlen(format);
                if (default_size < 256)
                        default_size = 256;
                buf.resize(default_size);
        }
 
        int len = porting::mt_snprintf(&buf[0], buf.size(), format, std::forward<Args>(args)...);
        if (len <= 0)
                throw std::runtime_error("gettext format error: " + std::string(format));
        if ((size_t)len >= buf.size()) {
                buf.resize(len+1); // extra null byte
                porting::mt_snprintf(&buf[0], buf.size(), format, std::forward<Args>(args)...);
        }
        buf.resize(len); // remove null bytes
 
        return buf;
}