Refactor logging

- Conference logging now behaves the same as 1-on-1 chats: Instead
  of creating a new log file every time we restat the client
  we use the unique conference ID to keep track of path names.
  This also allows us to load history for saved groups on client startup

- Added a log init function / general code refactor.

- Fixed a bug that caused log files to be created even when logging
  is disabled.

src/conference.c

@@ -114,6 +114,25 @@ static const char *conference_cmd_list[] = {
 
 static ToxWindow *new_conference_chat(uint32_t conferencenum);
 
+void conference_set_title(ToxWindow *self, uint32_t conferencesnum, const char *title, size_t length)
+{
+    ConferenceChat *chat = &conferences[conferencesnum];
+
+    if (!chat->active) {
+        return;
+    }
+
+    if (length > CONFERENCE_MAX_TITLE_LENGTH) {
+        length = CONFERENCE_MAX_TITLE_LENGTH;
+    }
+
+    memcpy(chat->title, title, length);
+    chat->title[length] = 0;
+    chat->title_length = length;
+
+    set_window_title(self, title, length);
+}
+
 static void kill_conference_window(ToxWindow *self)
 {
     ChatContext *ctx = self->chatwin;
@@ -130,8 +149,35 @@ static void kill_conference_window(ToxWindow *self)
     del_window(self);
 }
 
-int init_conference_win(Tox *m, uint32_t conferencenum, uint8_t type, const char *title,
-                        size_t title_length)
+static void init_conference_logging(ToxWindow *self, Tox *m, uint32_t conferencenum)
+{
+    ChatContext *ctx = self->chatwin;
+
+    char my_id[TOX_ADDRESS_SIZE];
+    tox_self_get_address(m, (uint8_t *) my_id);
+
+    char conference_id[TOX_CONFERENCE_ID_SIZE];
+    tox_conference_get_id(m, conferencenum, (uint8_t *) conference_id);
+
+    if (log_init(ctx->log, conferences[conferencenum].title, my_id, conference_id, LOG_TYPE_CHAT) != 0) {
+        line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Warning: Log failed to initialize.");
+        return;
+    }
+
+    if (load_chat_history(self, ctx->log) != 0) {
+        line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Failed to load chat history.");
+    }
+
+    if (user_settings->autolog == AUTOLOG_ON) {
+        if (log_enable(ctx->log) != 0) {
+            line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Failed to enable chat log.");
+        }
+    }
+
+    execute(ctx->history, self, m, "/log", GLOBAL_COMMAND_MODE);  // print log state to screen
+}
+
+int init_conference_win(Tox *m, uint32_t conferencenum, uint8_t type, const char *title, size_t length)
 {
     if (conferencenum > MAX_CONFERENCE_NUM) {
         return -1;
@@ -155,7 +201,10 @@ int init_conference_win(Tox *m, uint32_t conferencenum, uint8_t type, const char
             conferences[i].last_sent_audio = 0;
 
             set_active_window_index(conferences[i].chatwin);
-            set_window_title(self, title, title_length);
+
+            conference_set_title(self, conferencenum, title, length);
+
+            init_conference_logging(self, m, conferencenum);
 
             if (i == max_conference_index) {
                 ++max_conference_index;
@@ -225,6 +274,25 @@ static void delete_conference(ToxWindow *self, Tox *m, uint32_t conferencenum)
     free_conference(self, conferencenum);
 }
 
+void conference_rename_log_path(Tox *m, uint32_t conferencenum, const char *new_title)
+{
+    ConferenceChat *chat = &conferences[conferencenum];
+
+    if (!chat->active) {
+        return;
+    }
+
+    char myid[TOX_ADDRESS_SIZE];
+    tox_self_get_address(m, (uint8_t *) myid);
+
+    char conference_id[TOX_CONFERENCE_ID_SIZE];
+    tox_conference_get_id(m, conferencenum, (uint8_t *) conference_id);
+
+    if (rename_logfile(chat->title, new_title, myid, conference_id, chat->chatwin) != 0) {
+        fprintf(stderr, "Failed to rename conference log to `%s`\n", new_title);
+    }
+}
+
 /* destroys and re-creates conference window with or without the peerlist */
 void redraw_conference_win(ToxWindow *self)
 {
@@ -319,13 +387,21 @@ static void conference_onConferenceTitleChange(ToxWindow *self, Tox *m, uint32_t
         return;
     }
 
-    set_window_title(self, title, length);
+    ConferenceChat *chat = &conferences[conferencenum];
+
+    if (!chat->active) {
+        return;
+    }
+
+    conference_rename_log_path(m, conferencenum, title);  // must be called first
+
+    conference_set_title(self, conferencenum, title, length);
 
     char timefrmt[TIME_STR_SIZE];
     get_time_str(timefrmt, sizeof(timefrmt));
 
     /* don't announce title when we join the room */
-    if (!timed_out(conferences[self->num].start_time, CONFERENCE_EVENT_WAIT)) {
+    if (!timed_out(conferences[conferencenum].start_time, CONFERENCE_EVENT_WAIT)) {
         return;
     }
 
@@ -1038,17 +1114,6 @@ static void conference_onInit(ToxWindow *self, Tox *m)
 
     line_info_init(ctx->hst);
 
-    if (user_settings->autolog == AUTOLOG_ON) {
-        char myid[TOX_ADDRESS_SIZE];
-        tox_self_get_address(m, (uint8_t *) myid);
-
-        if (log_enable(self->name, myid, NULL, ctx->log, LOG_CONFERENCE) == -1) {
-            line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Warning: Log failed to initialize.");
-        }
-    }
-
-    execute(ctx->history, self, m, "/log", GLOBAL_COMMAND_MODE);
-
     scrollok(ctx->history, 0);
     wmove(self->window, y2 - CURS_Y_OFFSET, 0);
 }