src/config.cpp

/*
 *  LDForge: LDraw parts authoring CAD
 *  Copyright (C) 2013 Santeri Piippo
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <errno.h>
#include <time.h>
#include <QDir>
#include <QTextStream>
#include "common.h"
#include "config.h"
#include "misc.h"
#include "gui.h"

config* g_configPointers[MAX_CONFIG];
static ushort g_cfgPointerCursor = 0;

// =============================================================================
// Load the configuration from file
bool config::load()
{
	print( "config::load: Loading configuration file...\n" );
	print( "config::load: Path to configuration is %1\n", filepath() );
	
	// Locale must be disabled for atof
	setlocale( LC_NUMERIC, "C" );
	
	File f( filepath(), File::Read );
	int ln = 0;
	
	if( !f )
		return false;
	
	// Read the values.
	for( str line : f )
	{
		ln++;
		
		if( line.isEmpty() || line[0] == '#' )
			continue; // Empty line or comment.
		
		// Find the equals sign.
		int equals = line.indexOf( '=' );
		
		if( equals == -1 )
		{
			fprint( stderr, "couldn't find `=` sign in entry `%1`\n", line );
			continue;
		}
		
		str entry = line.left( equals );
		str valstring = line.right( line.length() - equals - 1 );
		
		// Find the config entry for this.
		config* cfg = null;
		
		for( config* i : g_configPointers )
		{
			if( !i )
				break;
			
			if( entry == i->name )
				cfg = i;
		}
		
		if( !cfg )
		{
			fprint( stderr, "unknown config `%1`\n", entry );
			continue;
		}
		
		switch( cfg->getType() )
		{
		case Type_int:
			static_cast<intconfig*>( cfg )->value = valstring.toInt();
			break;
		
		case Type_str:
			static_cast<strconfig*>( cfg )->value = valstring;
			break;
		
		case Type_float:
			static_cast<floatconfig*>( cfg )->value = valstring.toFloat();
			break;
		
		case Type_bool:
		{
			bool& val = static_cast<boolconfig*>( cfg )->value;
			
			if( valstring.toUpper() == "TRUE" || valstring == "1" )
				val = true;
			elif( valstring.toUpper() == "FALSE" || valstring == "0" )
				val = false;
			
			break;
		}
		
		case Type_keyseq:
			static_cast<keyseqconfig*>( cfg )->value = keyseq::fromString( valstring );
			break;
		
		default:
			break;
		}
	}
	
	f.close();
	return true;
}

extern_cfg( str, io_ldpath );

// =============================================================================
// Save the configuration to disk
bool config::save()
{
	// The function will write floats, disable the locale now so that they
	// are written properly.
	setlocale( LC_NUMERIC, "C" );
	
	// If the directory doesn't exist, create it now.
	if( QDir( dirpath() ).exists() == false )
	{
		fprint( stderr, "Creating config path %1...\n", dirpath() );
		
		if( !QDir().mkpath( dirpath() ))
		{
			critical( "Failed to create the configuration directory. Configuration cannot be saved!\n" );
			return false;
		}
	}
	
	File f( filepath(), File::Write );
	print( "writing cfg to %1\n", filepath() );
	
	if( !f )
	{
		critical( fmt( QObject::tr( "Cannot save configuration, cannot open %1 for writing: %2\n" ),
			filepath(), strerror( errno )) );
		return false;
	}
	
	fprint( f, "# Configuration file for " APPNAME "\n" );
	
	for( config * cfg : g_configPointers )
	{
		if( !cfg )
			break;
		
		if( cfg->isDefault() )
			continue;
		
		str valstring;
		
		switch( cfg->getType() )
		{
		case Type_int:
			valstring = fmt( "%1", static_cast<intconfig*>( cfg )->value );
			break;
		
		case Type_str:
			valstring = static_cast<strconfig*>( cfg )->value;
			break;
		
		case Type_float:
			valstring = fmt( "%1", static_cast<floatconfig*>( cfg )->value );
			break;
		
		case Type_bool:
			valstring = ( static_cast<boolconfig*>( cfg )->value ) ? "true" : "false";
			break;
		
		case Type_keyseq:
			valstring = static_cast<keyseqconfig*>( cfg )->value.toString();
			break;
		
		default:
			break;
		}
		
		// Write the entry now.
		fprint( f, "%1=%2\n", cfg->name, valstring );
	}
	
	f.close();
	return true;
}

// =============================================================================
void config::reset()
{
	for( config * cfg : g_configPointers )
	{
		if( !cfg )
			break;
		
		cfg->resetValue();
	}
}

// =============================================================================
str config::filepath()
{
	str path = fmt( "%1%2.cfg", dirpath(),
		str( APPNAME ).toLower() );
	return path;
}

// =============================================================================
str config::dirpath()
{
#ifndef _WIN32
	return fmt( "%1" DIRSLASH ".%2" DIRSLASH,
				QDir::homePath(), str( APPNAME ).toLower() );
#else
	return fmt( "%1" DIRSLASH APPNAME DIRSLASH, QDir::homePath() );
#endif // _WIN32
}

void addConfig( config* ptr )
{
	if( g_cfgPointerCursor == 0 )
		memset( g_configPointers, 0, sizeof g_configPointers );
	
	assert( g_cfgPointerCursor < MAX_CONFIG );
	g_configPointers[g_cfgPointerCursor++] = ptr;
}