source: set.h @ 420ddc00

  /********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2006 Wilmer van der Gaast and others                *
  \********************************************************************/

/* Some stuff to register, handle and save user preferences             */

/*
  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 with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef __SET_H__
#define __SET_H__

struct set;

/* This used to be specific to irc_t structures, but it's more generic now
   (so it can also be used for account_t structs). It's pretty simple, but
   so far pretty useful.
   
   In short, it just keeps a linked list of settings/variables and it also
   remembers a default value for every setting. And to prevent the user
   from setting invalid values, you can write an evaluator function for
   every setting, which can check a new value and block it by returning
   NULL, or replace it by returning a new value. See struct set.eval. */

typedef char *(*set_eval) ( struct set *set, char *value );

extern char *SET_INVALID;

typedef enum
{
        SET_NOSAVE = 0x0001,   /* Don't save this setting (i.e. stored elsewhere). */
        SET_NULL_OK = 0x0100,  /* set->value == NULL is allowed. */
        SET_HIDDEN = 0x0200,   /* Don't show up in setting lists. Mostly for internal storage. */
        SET_PASSWORD = 0x0400, /* Value shows up in settings list as "********". */
        SET_HIDDEN_DEFAULT = 0x0800, /* Hide unless changed from default. */
} set_flags_t;

typedef struct set
{
        void *data;     /* Here you can save a pointer to the
                           object this settings belongs to. */
        
        char *key;
        char *old_key;  /* Previously known as; for smooth upgrades. */
        char *value;
        char *def;      /* Default value. If the set_setstr() function
                           notices a new value is exactly the same as
                           the default, value gets set to NULL. So when
                           you read a setting, don't forget about this!
                           In fact, you should only read values using
                           set_getstr/int(). */
        
        set_flags_t flags; /* Mostly defined per user. */
        
        /* Eval: Returns SET_INVALID if the value is incorrect, exactly
           the passed value variable, or a corrected value. In case of
           the latter, set_setstr() will free() the returned string! */
        set_eval eval;
        void *eval_data;
        struct set *next;
} set_t;

#define set_value( set ) ((set)->value) ? ((set)->value) : ((set)->def)

/* Should be pretty clear. */
set_t *set_add( set_t **head, const char *key, const char *def, set_eval eval, void *data );

/* Returns the raw set_t. Might be useful sometimes. */
set_t *set_find( set_t **head, const char *key );

/* Returns a pointer to the string value of this setting. Don't modify the
   returned string, and don't free() it! */
G_MODULE_EXPORT char *set_getstr( set_t **head, const char *key );

/* Get an integer. In previous versions set_getint() was also used to read
   boolean values, but this SHOULD be done with set_getbool() now! */
G_MODULE_EXPORT int set_getint( set_t **head, const char *key );
G_MODULE_EXPORT int set_getbool( set_t **head, const char *key );

/* set_setstr() strdup()s the given value, so after using this function
   you can free() it, if you want. */
int set_setstr( set_t **head, const char *key, char *value );
int set_setint( set_t **head, const char *key, int value );
void set_del( set_t **head, const char *key );
int set_reset( set_t **head, const char *key );

/* returns true if a setting shall be shown to the user */
int set_isvisible( set_t *set );

/* Two very useful generic evaluators. */
char *set_eval_int( set_t *set, char *value );
char *set_eval_bool( set_t *set, char *value );

/* Another more complicated one. */
char *set_eval_list( set_t *set, char *value );

/* Some not very generic evaluators that really shouldn't be here... */
char *set_eval_to_char( set_t *set, char *value );
char *set_eval_oauth( set_t *set, char *value );

#endif /* __SET_H__ */