apps/irssi/src/fe-common/core/command-history.c

   1 /*
   2  command-history.c : irssi
   3
   4     Copyright (C) 1999 Timo Sirainen
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 #include "module.h"
  22 #include "signals.h"
  23 #include "misc.h"
  24 #include "special-vars.h"
  25 #include "settings.h"
  26
  27 #include "fe-windows.h"
  28 #include "window-items.h"
  29
  30 /* command history */
  31 static GList *history, *history_pos;
  32 static int history_lines, history_over_counter;
  33 static int window_history;
  34
  35 void command_history_add(WINDOW_REC *window, const char *text)
  36 {
  37         GList **phistory, *link;
  38         int *phistory_lines;
  39
  40         g_return_if_fail(text != NULL);
  41
  42         if (window_history) {
  43                 /* window specific command history */
  44                 phistory = &window->history;
  45                 phistory_lines = &window->history_lines;
  46         } else {
  47                 /* global command history */
  48                 phistory = &history;
  49                 phistory_lines = &history_lines;
  50         }
  51
  52         if (settings_get_int("max_command_history") < 1 || *phistory_lines < settings_get_int("max_command_history"))
  53                 (*phistory_lines)++;
  54         else {
  55                 link = *phistory;
  56                 g_free(link->data);
  57                 *phistory = g_list_remove_link(*phistory, link);
  58                 g_list_free_1(link);
  59         }
  60
  61         *phistory = g_list_append(*phistory, g_strdup(text));
  62 }
  63
  64 const char *command_history_prev(WINDOW_REC *window, const char *text)
  65 {
  66         GList *pos, **phistory_pos;
  67         int *phistory_over_counter;
  68
  69         if (window_history) {
  70                 phistory_pos = &window->history_pos;
  71                 phistory_over_counter = &window->history_over_counter;
  72         } else {
  73                 phistory_pos = &history_pos;
  74                 phistory_over_counter = &history_over_counter;
  75         }
  76
  77         pos = *phistory_pos;
  78         if (*phistory_pos != NULL) {
  79                 *phistory_pos = (*phistory_pos)->prev;
  80                 if (*phistory_pos == NULL)
  81                         (*phistory_over_counter)++;
  82         } else {
  83                 *phistory_pos = g_list_last(window_history ?
  84                                             window->history : history);
  85         }
  86
  87         if (*text != '\0' &&
  88             (pos == NULL || strcmp(pos->data, text) != 0)) {
  89                 /* save the old entry to history */
  90                 command_history_add(window, text);
  91         }
  92
  93         return *phistory_pos == NULL ? "" : (*phistory_pos)->data;
  94 }
  95
  96 const char *command_history_next(WINDOW_REC *window, const char *text)
  97 {
  98         GList *pos, **phistory_pos;
  99         int *phistory_over_counter;
 100
 101         if (window_history) {
 102                 phistory_pos = &window->history_pos;
 103                 phistory_over_counter = &window->history_over_counter;
 104         } else {
 105                 phistory_pos = &history_pos;
 106                 phistory_over_counter = &history_over_counter;
 107         }
 108
 109         pos = *phistory_pos;
 110
 111         if (pos != NULL)
 112                 *phistory_pos = (*phistory_pos)->next;
 113         else if (*phistory_over_counter > 0) {
 114                 (*phistory_over_counter)--;
 115                 *phistory_pos = window_history ? window->history : history;
 116         }
 117
 118         if (*text != '\0' &&
 119             (pos == NULL || strcmp(pos->data, text) != 0)) {
 120                 /* save the old entry to history */
 121                 command_history_add(window, text);
 122         }
 123         return *phistory_pos == NULL ? "" : (*phistory_pos)->data;
 124 }
 125
 126 void command_history_clear_pos(WINDOW_REC *window)
 127 {
 128         window->history_over_counter = 0;
 129         window->history_pos = NULL;
 130         history_over_counter = 0;
 131         history_pos = NULL;
 132 }
 133
 134 static void sig_window_destroyed(WINDOW_REC *window)
 135 {
 136         g_list_foreach(window->history, (GFunc) g_free, NULL);
 137         g_list_free(window->history);
 138 }
 139
 140 static char *special_history_func(const char *text, void *item, int *free_ret)
 141 {
 142         WINDOW_REC *window;
 143         GList *tmp;
 144         char *findtext, *ret;
 145
 146         window = item == NULL ? active_win : window_item_window(item);
 147
 148         findtext = g_strdup_printf("*%s*", text);
 149         ret = NULL;
 150
 151         tmp = window_history ? window->history : history;
 152         for (; tmp != NULL; tmp = tmp->next) {
 153                 const char *line = tmp->data;
 154
 155                 if (match_wildcards(findtext, line)) {
 156                         *free_ret = TRUE;
 157                         ret = g_strdup(line);
 158                 }
 159         }
 160         g_free(findtext);
 161
 162         return ret;
 163 }
 164
 165 static void read_settings(void)
 166 {
 167         window_history = settings_get_bool("window_history");
 168 }
 169
 170 void command_history_init(void)
 171 {
 172         settings_add_int("history", "max_command_history", 100);
 173         settings_add_bool("history", "window_history", FALSE);
 174
 175         special_history_func_set(special_history_func);
 176
 177         history_lines = 0; history_over_counter = 0;
 178         history = NULL; history_pos = NULL;
 179
 180         read_settings();
 181         signal_add("window destroyed", (SIGNAL_FUNC) sig_window_destroyed);
 182         signal_add("setup changed", (SIGNAL_FUNC) read_settings);
 183 }
 184
 185 void command_history_deinit(void)
 186 {
 187         signal_remove("window destroyed", (SIGNAL_FUNC) sig_window_destroyed);
 188         signal_remove("setup changed", (SIGNAL_FUNC) read_settings);
 189
 190         g_list_foreach(history, (GFunc) g_free, NULL);
 191         g_list_free(history);
 192 }