/**

 * @file cmds.h Commands API

 * @ingroup core

 * @see @ref cmd-signals

 */

/* Copyright (C) 2003 Timothy Ringenbach <omarvo@hotmail.com>

 *

 * 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 2 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, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA

 *

 */

#ifndef _PURPLE_CMDS_H_

#define _PURPLE_CMDS_H_

#include "conversation.h"

/**************************************************************************/

/** @name Structures                                                      */

/**************************************************************************/

/*@{*/

/** The possible results of running a command with purple_cmd_do_command(). */

typedef enum _PurpleCmdStatus {

	PURPLE_CMD_STATUS_OK,

	PURPLE_CMD_STATUS_FAILED,

	PURPLE_CMD_STATUS_NOT_FOUND,

	PURPLE_CMD_STATUS_WRONG_ARGS,

	PURPLE_CMD_STATUS_WRONG_PRPL,

	PURPLE_CMD_STATUS_WRONG_TYPE

} PurpleCmdStatus;

/** Commands registered with the core return one of these values when run.

 *  Normally, a command will want to return one of the first two; in some

 *  unusual cases, you might want to have several functions called for a

 *  particular command; in this case, they should return

 *  #PURPLE_CMD_RET_CONTINUE to cause the core to fall through to other

 *  commands with the same name.

 */

typedef enum _PurpleCmdRet {

	PURPLE_CMD_RET_OK,       /**< Everything's okay; Don't look for another command to call. */

	PURPLE_CMD_RET_FAILED,   /**< The command failed, but stop looking.*/

	PURPLE_CMD_RET_CONTINUE /**< Continue, looking for other commands with the same name to call. */

} PurpleCmdRet;

#define PURPLE_CMD_FUNC(func) ((PurpleCmdFunc)func)

/** A function implementing a command, as passed to purple_cmd_register().

 *

 *  @todo document the arguments to these functions.

 * */

typedef PurpleCmdRet (*PurpleCmdFunc)(PurpleConversation *, const gchar *cmd,

                                  gchar **args, gchar **error, void *data);

/** A unique integer representing a command registered with

 *  purple_cmd_register(), which can subsequently be passed to

 *  purple_cmd_unregister() to unregister that command.

 */

typedef guint PurpleCmdId;

typedef enum _PurpleCmdPriority {

	PURPLE_CMD_P_VERY_LOW  = -1000,

	PURPLE_CMD_P_LOW       =     0,

	PURPLE_CMD_P_DEFAULT   =  1000,

	PURPLE_CMD_P_PRPL      =  2000,

	PURPLE_CMD_P_PLUGIN    =  3000,

	PURPLE_CMD_P_ALIAS     =  4000,

	PURPLE_CMD_P_HIGH      =  5000,

	PURPLE_CMD_P_VERY_HIGH =  6000

} PurpleCmdPriority;

/** Flags used to set various properties of commands.  Every command should

 *  have at least one of #PURPLE_CMD_FLAG_IM and #PURPLE_CMD_FLAG_CHAT set in

 *  order to be even slighly useful.

 *

 *  @see purple_cmd_register

 */

typedef enum _PurpleCmdFlag {

	/** Command is usable in IMs. */

	PURPLE_CMD_FLAG_IM               = 0x01,

	/** Command is usable in multi-user chats. */

	PURPLE_CMD_FLAG_CHAT             = 0x02,

	/** Command is usable only for a particular prpl. */

	PURPLE_CMD_FLAG_PRPL_ONLY        = 0x04,

	/** Incorrect arguments to this command should be accepted anyway. */

	PURPLE_CMD_FLAG_ALLOW_WRONG_ARGS = 0x08

} PurpleCmdFlag;

/*@}*/

#ifdef __cplusplus

extern "C" {

#endif

/**************************************************************************/

/** @name Commands API                                                    */

/**************************************************************************/

/*@{*/

/**

 * Register a new command with the core.

 *

 * The command will only happen if commands are enabled,

 * which is a UI pref. UIs don't have to support commands at all.

 *

 * @param cmd The command. This should be a UTF-8 (or ASCII) string, with no spaces

 *            or other white space.

 * @param args A string of characters describing to libpurple how to parse this

 *             command's arguments.  If what the user types doesn't match this

 *             pattern, libpurple will keep looking for another command, unless

 *             the flag #PURPLE_CMD_FLAG_ALLOW_WRONG_ARGS is passed in @a f.

 *             This string should contain no whitespace, and use a single

 *             character for each argument.  The recognized characters are:

 *             <ul>

 *               <li><tt>'w'</tt>: Matches a single word.</li>

 *               <li><tt>'W'</tt>: Matches a single word, with formatting.</li>

 *               <li><tt>'s'</tt>: Matches the rest of the arguments after this

 *                                 point, as a single string.</li>

 *               <li><tt>'S'</tt>: Same as <tt>'s'</tt> but with formatting.</li>

 *             </ul>

 *             If args is the empty string, then the command accepts no arguments.

 *             The args passed to the callback @a func will be a @c NULL

 *             terminated array of @c NULL terminated strings, and will always

 *             match the number of arguments asked for, unless

 *             #PURPLE_CMD_FLAG_ALLOW_WRONG_ARGS is passed.

 * @param p This is the priority. Higher priority commands will be run first,

 *          and usually the first command will stop any others from being

 *          called.

 * @param f Flags specifying various options about this command, combined with

 *          <tt>|</tt> (bitwise OR). You need to at least pass one of

 *          #PURPLE_CMD_FLAG_IM or #PURPLE_CMD_FLAG_CHAT (you may pass both) in

 *          order for the command to ever actually be called.

 * @param prpl_id If the #PURPLE_CMD_FLAG_PRPL_ONLY flag is set, this is the id

 *                of the prpl to which the command applies (such as

 *                <tt>"prpl-msn"</tt>). If the flag is not set, this parameter

 *                is ignored; pass @c NULL (or a humourous string of your

 *                choice!).

 * @param func This is the function to call when someone enters this command.

 * @param helpstr a whitespace sensitive, UTF-8, HTML string describing how to

 *                use the command.  The preferred format of this string is the

 *                command's name, followed by a space and any arguments it

 *                accepts (if it takes any arguments, otherwise no space),

 *                followed by a colon, two spaces, and a description of the

 *                command in sentence form.  Do not include a slash before the

 *                command name.

 * @param data User defined data to pass to the #PurpleCmdFunc @a f.

 * @return A #PurpleCmdId, which is only used for calling

 *         #purple_cmd_unregister, or @a 0 on failure.

 */

PurpleCmdId purple_cmd_register(const gchar *cmd, const gchar *args, PurpleCmdPriority p, PurpleCmdFlag f,

                             const gchar *prpl_id, PurpleCmdFunc func, const gchar *helpstr, void *data);

/**

 * Unregister a command with the core.

 *

 * All registered commands must be unregistered, if they're registered by a plugin

 * or something else that might go away. Normally this is called when the plugin

 * unloads itself.

 *

 * @param id The #PurpleCmdId to unregister, as returned by #purple_cmd_register.

 */

void purple_cmd_unregister(PurpleCmdId id);

/**

 * Do a command.

 *

 * Normally the UI calls this to perform a command. This might also be useful

 * if aliases are ever implemented.

 *

 * @param conv The conversation the command was typed in.

 * @param cmdline The command the user typed (including all arguments) as a single string.

 *            The caller doesn't have to do any parsing, except removing the command

 *            prefix, which the core has no knowledge of. cmd should not contain any

 *            formatting, and should be in plain text (no html entities).

 * @param markup This is the same as cmd, but is the formatted version. It should be in

 *               HTML, with < > and &, at least, escaped to html entities, and should

 *               include both the default formatting and any extra manual formatting.

 * @param errormsg If the command failed errormsg is filled in with the appropriate error

 *                 message. It must be freed by the caller with g_free().

 * @return A #PurpleCmdStatus indicating if the command succeeded or failed.

 */

PurpleCmdStatus purple_cmd_do_command(PurpleConversation *conv, const gchar *cmdline,

                                  const gchar *markup, gchar **errormsg);

/**

 * List registered commands.

 *

 * Returns a <tt>GList</tt> (which must be freed by the caller) of all commands

 * that are valid in the context of @a conv, or all commands, if @a conv is @c

 * NULL.  Don't keep this list around past the main loop, or anything else that

 * might unregister a command, as the <tt>const char *</tt>'s used get freed

 * then.

 *

 * @param conv The conversation, or @c NULL.

 * @return A @c GList of <tt>const char *</tt>, which must be freed with

 *         <tt>g_list_free()</tt>.

 */

GList *purple_cmd_list(PurpleConversation *conv);

/**

 * Get the help string for a command.

 *

 * Returns the help strings for a given command in the form of a GList,

 * one node for each matching command.

 *

 * @param conv The conversation, or @c NULL for no context.

 * @param cmd The command. No wildcards accepted, but returns help for all

 *            commands if @c NULL.

 * @return A <tt>GList</tt> of <tt>const char *</tt>s, which is the help string

 *         for that command.

 */

GList *purple_cmd_help(PurpleConversation *conv, const gchar *cmd);

/**

 * Get the handle for the commands API

 * @return The handle

 * @since 2.5.0

 */

gpointer purple_cmds_get_handle(void);

/**

 * Initialize the commands subsystem.

 * @since 2.5.0

 */

void purple_cmds_init(void);

/**

 * Uninitialize the commands subsystem.

 * @since 2.5.0

 */

void purple_cmds_uninit(void);

/*@}*/

#ifdef __cplusplus

}

#endif

#endif /* _PURPLE_CMDS_H_ */