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/* $Id$ */
/** @file command_func.h Functions related to commands. */
#ifndef COMMAND_FUNC_H
#define COMMAND_FUNC_H
#include "command_type.h"
/**
* Checks if a command failes.
*
* As you see the parameter is not a command but the return value of a command,
* the CommandCost class. This function checks if the command executed by
* the CommandProc function failed and returns true if it does.
*
* @param cost The return value of a CommandProc call
* @return true if the command failes
* @see CmdSucceded
*/
static inline bool CmdFailed(CommandCost cost) { return cost.Failed(); }
/**
* Checks if a command succeeded.
*
* As #CmdFailed this function checks if a command succeeded
*
* @param cost The return value of a CommandProc call
* @return true if the command succeeded
* @see CmdSucceeded
*/
static inline bool CmdSucceeded(CommandCost cost) { return cost.Succeeded(); }
/**
* Define a default return value for a failed command.
*
* This variable contains a CommandCost object with is declared as "failed".
* Other functions just need to return this error if there is an error,
* which doesn't need to specific by a StringID.
*/
static const CommandCost CMD_ERROR = CommandCost(INVALID_STRING_ID);
/**
* Returns from a function with a specific StringID as error.
*
* This macro is used to return from a function. The parameter contains the
* StringID which will be returned.
*
* @param errcode The StringID to return
*/
#define return_cmd_error(errcode) return CommandCost(errcode);
/**
* Execute a command
*/
CommandCost DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint32 cmd, const char *text = NULL);
/**
* Execute a network safe DoCommand function
*/
bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, uint32 cmd, CommandCallback *callback = NULL, const char *text = NULL, bool my_cmd = true);
#ifdef ENABLE_NETWORK
/**
* Send a command over the network
*/
void NetworkSend_Command(TileIndex tile, uint32 p1, uint32 p2, uint32 cmd, CommandCallback *callback, const char *text);
#endif /* ENABLE_NETWORK */
extern Money _additional_cash_required;
extern StringID _error_message;
/**
* Checks if a integer value belongs to a command.
*/
bool IsValidCommand(uint32 cmd);
/**
* Returns the flags from a given command.
*/
byte GetCommandFlags(uint32 cmd);
/**
* Returns the current money available which can be used for a command.
*/
Money GetAvailableMoneyForCommand();
#endif /* COMMAND_FUNC_H */
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