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adium / Source / OWSpellingPerContactPlugin.m

/* 
 * Adium is the legal property of its developers, whose names are listed in the copyright file included
 * with this source distribution.
 * 
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#import "OWSpellingPerContactPlugin.h"
#import <Adium/AIChat.h>
#import <Adium/AIListContact.h>

#import <AIUtilities/AIApplicationAdditions.h>
#import <AIUtilities/AILeopardCompatibility.h>

#define GROUP_LAST_USED_SPELLING        @"Last Used Spelling"
#define KEY_LAST_USED_SPELLING          @"Last Used Spelling Languge"

/*!
 * @class OWSpellingPerContactPlugin
 * @brief Component to save and restore spelling dictionary language preferences on a per-contact basis for chats
 *
 * Language settings on a group chat basis are not currently saved.
 */
@implementation OWSpellingPerContactPlugin

/*!
 * @brief Install
 */
- (void)installPlugin
{
        NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
        
        [notificationCenter addObserver:self
                                                   selector:@selector(chatBecameActive:)
                                                           name:Chat_BecameActive
                                                         object:nil];
        
        [notificationCenter addObserver:self
                                                   selector:@selector(chatWillClose:)
                                                           name:Chat_WillClose
                                                         object:nil];
        
        languageDict = [[NSMutableDictionary alloc] init];
        
        //Find the first language the user prefers which the spellchecker knows about, then keep it around for future reference
        NSArray *preferredLanguages = nil;
        if ([NSApp isOnSnowLeopardOrBetter]) {
                preferredLanguages = [[NSSpellChecker sharedSpellChecker] userPreferredLanguages];
        } else {
                preferredLanguages = [[NSSpellChecker sharedSpellChecker] availableLanguages];
        }
                
        if (preferredLanguages.count) {
                preferredLanguage = [preferredLanguages objectAtIndex:0];
        }
}

/*!
 * @brief Uninstall
 */
- (void)uninstallPlugin
{
        [languageDict release]; languageDict = nil;
        [preferredLanguage release]; preferredLanguage = nil;
        
        [[NSNotificationCenter defaultCenter] removeObserver:self];
}

/*!
 * @brief A chat became active; set the spelling language preference appropriately
 *
 * If a chat was previously active, as indicated by the PreviouslyActiveChat key in the notification's userInfo,
 * its language preference is stored before switching.
 */
- (void)chatBecameActive:(NSNotification *)notification
{
        @try
        {
                AIChat   *newChat = [notification object];
                AIChat   *previousChat = [[notification userInfo] objectForKey:@"PreviouslyActiveChat"];

                if (previousChat) {
                        NSString *language = [[NSSpellChecker sharedSpellChecker] language];
                        NSString *chatID = [previousChat uniqueChatID];

                        if (language &&
                                ![[languageDict objectForKey:chatID] isEqualToString:language]) {
                                //If this chat is not known to be in the current language, store its setting in our languageDict
                                [languageDict setObject:language
                                                                 forKey:chatID];
                        }
                }
                
                if (newChat) {
                        NSString *chatID = [newChat uniqueChatID];
                        NSString *newChatLanguage = [languageDict objectForKey:chatID];
                        
                        //If we don't have a previously noted language, try to load one from a preference
                        if (!newChatLanguage) {
                                AIListObject *listObject = [newChat listObject];

                                if (listObject) {
                                        //Load the preference if possible
                                        newChatLanguage = [listObject preferenceForKey:KEY_LAST_USED_SPELLING group:GROUP_LAST_USED_SPELLING];
                                }

                                if (!newChatLanguage) {
                                        //If no preference, use the preferred language
                                        newChatLanguage = preferredLanguage;
                                }

                                [languageDict setObject:newChatLanguage
                                                                 forKey:chatID];
                        }

                        [[NSSpellChecker sharedSpellChecker] setLanguage:newChatLanguage];
                }
        }
        @catch(id exc) {}
}

/*!
 * @brief Chat will close; save the language preference for its contact before it closes
 */
- (void)chatWillClose:(NSNotification *)notification
{
        AIChat                  *chat = [notification object];
        AIListContact   *listObject = chat.listObject;

        if (listObject) {
                NSString         *chatID = chat.uniqueChatID;
                NSString         *chatLanguage = [languageDict objectForKey:chatID];

                //If we didn't cache a language for this chat, or the chat is currently the active chat, use the spell checker's value.
                if (!chatLanguage || adium.interfaceController.activeChat == chat)
                        chatLanguage = [[NSSpellChecker sharedSpellChecker] language];

                //Now, if we end up at the user's default language, we don't want to store anything
                if ([preferredLanguage isEqualToString:chatLanguage])
                        chatLanguage = nil;
                
                NSString *previousLanguage = [listObject preferenceForKey:KEY_LAST_USED_SPELLING group:GROUP_LAST_USED_SPELLING];
                if ((previousLanguage && ![previousLanguage isEqualToString:chatLanguage]) ||
                         (!previousLanguage && chatLanguage)) {
                        [listObject setPreference:chatLanguage
                                                           forKey:KEY_LAST_USED_SPELLING
                                                                group:GROUP_LAST_USED_SPELLING];
                }
                
                [languageDict removeObjectForKey:chatID];
        }
}

@end