MUtilities/include/MUtils/Global.h

///////////////////////////////////////////////////////////////////////////////
// MuldeR's Utilities for Qt
// Copyright (C) 2004-2016 LoRd_MuldeR <MuldeR2@GMX.de>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// http://www.gnu.org/licenses/lgpl-2.1.txt
//////////////////////////////////////////////////////////////////////////////////

/**
* @file
* @brief This file contains miscellaneous functions that are generally useful for Qt-based applications
*/

#pragma once

#include <QString>

//Forward Declarations
class QProcess;

///////////////////////////////////////////////////////////////////////////////

//MUtils API
#ifdef _MSC_VER
#	ifdef MUTILS_DLL_EXPORT
#		define MUTILS_API __declspec(dllexport)
#	else
#		ifndef MUTILS_STATIC_LIB
#			define MUTILS_API __declspec(dllimport)
#		else
#			define MUTILS_API /*static lib*/
#		endif
#	endif
#else
#	define MUTILS_API
#endif

//Helper Macros
#define MUTILS_MAKE_STRING_HELPER(X) #X
#define MUTILS_MAKE_STRING(X) MUTILS_MAKE_STRING_HELPER(X)
#define MUTILS_COMPILER_WARNING(TXT) __pragma(message(__FILE__ "(" MUTILS_MAKE_STRING(__LINE__) ") : warning: " TXT))

//Check Debug Flags
#if defined(_DEBUG) || defined(DEBUG) || (!defined(NDEBUG))
#	define MUTILS_DEBUG (1)
#	if defined(NDEBUG) || defined(QT_NO_DEBUG) || (!defined(QT_DEBUG))
#		error Inconsistent DEBUG flags have been detected!
#	endif
#else
#	define MUTILS_DEBUG (0)
#	if (!defined(NDEBUG)) || (!defined(QT_NO_DEBUG)) || defined(QT_DEBUG)
#		error Inconsistent DEBUG flags have been detected!
#	endif
#endif

//Check CPU options
#if defined(_MSC_VER) && (!defined(__INTELLISENSE__)) && (!defined(_M_X64)) && defined(_M_IX86_FP)
	#if (_M_IX86_FP != 0)
		#error We should not enabled SSE or SSE2 in release builds!
	#endif
#endif

///////////////////////////////////////////////////////////////////////////////

/**
* \mainpage MuldeR's Utilities for Qt
* 
* The **MUtilities** library is a collection of routines and classes to extend the [*Qt cross-platform framework*](http://qt-project.org/). It contains various convenience and utility functions as well as wrappers for OS-specific functionalities. The library was originally created as a "side product" of the [**LameXP**](http://lamexp.sourceforge.net/) application: Over the years, a lot of code, **not** really specific to *LameXP*, had accumulated in the *LameXP* code base. Some of that code even had been used in other projects too, in a "copy & paste" fashion &ndash; which had lead to redundancy and much complicated maintenance. In order to clean-up the LameXP code base, to eliminate the ugly redundancy and to simplify maintenance, the code in question has finally been refactored into the **MUtilities** (aka "MuldeR's Utilities for Qt") library. This library now forms the foundation of *LameXP* and [*other OpenSource projects*](https://github.com/lordmulder).
* 
* 
* ### API-Documentation
* 
* The public API of the *MUtilities* library is defined in the following header files:
* - **Global.h** &ndash; miscellaneous useful functions
* 
* 
* ### License
* 
* This library is free software. It is released under the terms of the [GNU Lesser General Public License (LGPL), Version 2.1](https://www.gnu.org/licenses/lgpl-2.1.html).
* 
* ```
* MUtilities - MuldeR's Utilities for Qt
* Copyright (C) 2004-2016 LoRd_MuldeR <MuldeR2@GMX.de>. Some rights reserved.
* 
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* 
* This library 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
* Lesser General Public License for more details.
* 
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
* ```
*/

namespace MUtils
{
	/**
	* \brief Rerieves the full path of the application's *Temp* folder.
	*
	* The application's *Temp* folder is a unique application-specific folder, intended to store any temporary files that the application may need. It will be created when this function is called for the first time (lazy initialization); subsequent calls are guaranteed to return the same path. Usually the application's *Temp* folder will be created as a sub-folder of the system's global *Temp* folder, as indicated by the `TMP` or `TEMP` environment variables. However, it may be created at a different place(e.g. in the users *Profile* directory), if those environment variables don't point to a usable directory. In any case, this function makes sure that the application's *Temp* folder exists for the whole lifetime of the application and that it is writable. When the application is about to terminate, the application's *Temp* folder and all files or sub-directories thereof will be *removed* automatically!
	*
	* \return If the function succeeds, it returns a read-only reference to a QString holding the full path of the application's *Temp* folder; otherwise a read-only reference to a default-constructed QString is returned.
	*/
	MUTILS_API const QString& temp_folder(void);

	//Process Utils
	MUTILS_API void init_process(QProcess &process, const QString &wokringDir, const bool bReplaceTempDir = true, const QStringList *const extraPaths = NULL);

	/**
	* \brief Generates a *random* unsigned 32-Bit value.
	*
	* The *random* value is created using a "strong" PRNG of the underlying system, if possible. Otherwise a fallback PRNG is used. It is **not** required or useful to call `srand()` or `qsrand()` prior to using this function. If necessary, the seeding of the PRNG happen *automatically* on the first call.
	*
	* \return The function retruns a *random* unsigned 32-Bit value.
	*/
	MUTILS_API quint32 next_rand_u32(void);
	
	/**
	* \brief Generates a *random* unsigned 64-Bit value.
	*
	* The *random* value is created using a "strong" PRNG of the underlying system, if possible. Otherwise a fallback PRNG is used. It is **not** required or useful to call `srand()` or `qsrand()` prior to using this function. If necessary, the seeding of the PRNG happen *automatically* on the first call.
	*
	* \return The function retruns a *random* unsigned 64-Bit value.
	*/
	MUTILS_API quint64 next_rand_u64(void);
	
	/**
	* \brief Generates a *random* string.
	*
	* The random string is generated using the same PRNG as the `next_rand_u64()` function. The *random* bytes are converted to a hexadecimal string and, if necessary, zero-padded to a toal length of 16 or 32 characters. There is **no** `0x`-prefix included in the result.
	*
	* \param bLong If set to `true`, a "long" random string (32 characters) will be generated; if set to `false`, a "short" random string (16 characters) is generated.
	*
	* \return The function retruns a QString holding a *random* hexadecimal string
	*/
	MUTILS_API QString next_rand_str(const bool &bLong = false);

	/**
	* \brief Generates a temporary file name.
	*
	* The function generates a file name that contains a *random* component and that is guaranteed to **not** exist yet. The generated file name follows a `"<basedir>/<random>.<ext>"` pattern. This is useful (not only) for creating temporary files.
	*
	* \param basePath Specifies the "base" directory where the temporary file is supposed to be created. This must be a valid *existing* directory.
	*
	* \param extension Specifies the desired file extensions of the temporary file. Do **not** include a leading dot (`.`) character.
	*
	* \param placeholder If set to `true`, the function creates an empty "placeholder" file under the returned file name; if set to `false`, it does *not*.
	*
	* \return If the function succeeds, it returns a QString holding the full path of the temporary file; otherwise it returns a default-constructed QString.
	*/
	MUTILS_API QString make_temp_file(const QString &basePath, const QString &extension, const bool placeholder = false);

	/**
	* \brief Generates a unique file name.
	*
	* The function generates a unique file name in the specified directory. The function guarantees that the return file name does *not* exist yet. If necessary, a *counter* will be included in the file name in order to ensure its uniqueness.
	*
	* \param basePath Specifies the "base" directory where the unique file is supposed to be created. This must be a valid *existing* directory.
	*
	* \param baseName Specifies the desired "base" file name of the unqiue file. Do **not** include a file extension.
	*
	* \param extension Specifies the desired file extensions of the unqiue file. Do **not** include a leading dot (`.`) character.
	*
	* \param fancy If set to `true`, the file name is generated according to the `"<basedir>/<basername> (N).<ext>"` pattern; if set to `false`, the file name is generated according to the `"<basedir>/<basername>.XXXX.<ext>"` pattern.
	*
	* \return If the function succeeds, it returns a QString holding the full path of the unique file; otherwise it returns a default-constructed QString.
	*/
	MUTILS_API QString make_unique_file(const QString &basePath, const QString &baseName, const QString &extension, const bool fancy = false);

	/**
	* \brief Computes the *parity* of the given unsigned 32-Bit value
	*
	* \param value The 32-Bit unsigned value from which the parity is to be computed.
	*
	* \return The function returns `true`, if the number of **1** bits in the given value is *odd*; it returns `false`, if the number of **1** bits in the given value is *even*.
	*/
	MUTILS_API bool parity(quint32 value);

	//Remove File/Dir
	MUTILS_API bool remove_file(const QString &fileName);
	MUTILS_API bool remove_directory(const QString &folderPath, const bool &recursive);

	//String utils
	MUTILS_API QString& trim_right(QString &str);
	MUTILS_API QString& trim_left(QString &str);
	MUTILS_API QString trim_right(const QString &str);
	MUTILS_API QString trim_left(const QString &str);

	//String sorting
	MUTILS_API void natural_string_sort(QStringList &list, const bool bIgnoreCase);

	//Clean file path
	MUTILS_API QString clean_file_name(const QString &name);
	MUTILS_API QString clean_file_path(const QString &path);

	//Regular expressions
	MUTILS_API bool regexp_parse_uint32(const QRegExp &regexp, quint32 &value);
	MUTILS_API bool regexp_parse_uint32(const QRegExp &regexp, quint32 *values, const size_t &count);

	//Internationalization
	MUTILS_API QStringList available_codepages(const bool &noAliases = true);

	//Internal
	namespace Internal
	{
		MUTILS_API int selfTest(const char *const buildKey, const bool debug);
		static const int s_selfTest = selfTest(__DATE__ "@" __TIME__, MUTILS_DEBUG);
	}
}

///////////////////////////////////////////////////////////////////////////////

//Delete helper
#define MUTILS_DELETE(PTR) do { if((PTR)) { delete (PTR); (PTR) = NULL; } } while(0)
#define MUTILS_DELETE_ARRAY(PTR) do { if((PTR)) { delete [] (PTR); (PTR) = NULL; } } while(0)

//Zero memory
#define MUTILS_ZERO_MEMORY(PTR) memset(&(PTR), 0, sizeof((PTR)))

//String conversion macros
#define MUTILS_WCHR(STR) (reinterpret_cast<const wchar_t*>((STR).utf16()))
#define MUTILS_UTF8(STR) ((STR).toUtf8().constData())
#define MUTILS_QSTR(STR) (QString::fromUtf16(reinterpret_cast<const unsigned short*>((STR))))

//Boolean helper
#define MUTILS_BOOL2STR(X) ((X) ? "1" : "0")