src/screen_find.c

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2017 The Music Player Daemon Project
   3  * Project homepage: http://musicpd.org
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include "screen_find.h"
  21 #include "screen_utils.h"
  22 #include "screen_status.h"
  23 #include "screen.h"
  24 #include "keyboard.h"
  25 #include "i18n.h"
  26 #include "options.h"
  27 #include "ncmpc.h"
  28
  29 #define FIND_PROMPT  _("Find")
  30 #define RFIND_PROMPT _("Find backward")
  31 #define JUMP_PROMPT _("Jump")
  32
  33 /* query user for a string and find it in a list window */
  34 bool
  35 screen_find(struct list_window *lw, command_t findcmd,
  36             list_window_callback_fn_t callback_fn,
  37             void *callback_data)
  38 {
  39         bool found;
  40         const char *prompt = FIND_PROMPT;
  41
  42         const bool reversed =
  43                 findcmd == CMD_LIST_RFIND || findcmd == CMD_LIST_RFIND_NEXT;
  44         if (reversed)
  45                 prompt = RFIND_PROMPT;
  46
  47         switch (findcmd) {
  48         case CMD_LIST_FIND:
  49         case CMD_LIST_RFIND:
  50                 if (screen.findbuf) {
  51                         g_free(screen.findbuf);
  52                         screen.findbuf=NULL;
  53         }
  54                 /* fall through */
  55
  56         case CMD_LIST_FIND_NEXT:
  57         case CMD_LIST_RFIND_NEXT:
  58                 if (!screen.findbuf) {
  59                         char *value = options.find_show_last_pattern
  60                                 ? (char *) -1 : NULL;
  61                         screen.findbuf=screen_readln(prompt,
  62                                                      value,
  63                                                      &screen.find_history,
  64                                                      NULL);
  65                 }
  66
  67                 if (screen.findbuf == NULL)
  68                         return 1;
  69
  70                 found = reversed
  71                         ? list_window_rfind(lw,
  72                                             callback_fn, callback_data,
  73                                             screen.findbuf,
  74                                             options.find_wrap,
  75                                             options.bell_on_wrap)
  76                         : list_window_find(lw,
  77                                            callback_fn, callback_data,
  78                                            screen.findbuf,
  79                                            options.find_wrap,
  80                                            options.bell_on_wrap);
  81                 if (!found) {
  82                         screen_status_printf(_("Unable to find \'%s\'"),
  83                                              screen.findbuf);
  84                         screen_bell();
  85                 }
  86                 return 1;
  87         default:
  88                 break;
  89         }
  90         return 0;
  91 }
  92
  93 /* query user for a string and jump to the entry
  94  * which begins with this string while the users types */
  95 void
  96 screen_jump(struct list_window *lw,
  97             list_window_callback_fn_t callback_fn, void *callback_data,
  98             list_window_paint_callback_t paint_callback, void *paint_data)
  99 {
 100         const int WRLN_MAX_LINE_SIZE = 1024;
 101         int key = 65;
 102
 103         if (screen.findbuf) {
 104                 g_free(screen.findbuf);
 105                 screen.findbuf = NULL;
 106         }
 107         screen.findbuf = g_malloc0(WRLN_MAX_LINE_SIZE);
 108         /* In screen.findbuf is the whole string which is displayed in the status_window
 109          * and search_str is the string the user entered (without the prompt) */
 110         char *search_str = screen.findbuf + g_snprintf(screen.findbuf, WRLN_MAX_LINE_SIZE, "%s: ", JUMP_PROMPT);
 111         char *iter = search_str;
 112
 113         while(1) {
 114                 key = screen_getch(screen.findbuf);
 115                 /* if backspace or delete was pressed, process instead of ending loop */
 116                 if (key == KEY_BACKSPACE || key == KEY_DC) {
 117                         int i;
 118                         if (search_str <= g_utf8_find_prev_char(screen.findbuf, iter))
 119                                 iter = g_utf8_find_prev_char(screen.findbuf, iter);
 120                         for (i = 0; *(iter + i) != '\0'; i++)
 121                                 *(iter + i) = '\0';
 122                         continue;
 123                 }
 124                 /* if a control key was pressed, end loop */
 125                 else if (g_ascii_iscntrl(key) || key == KEY_NPAGE || key == KEY_PPAGE) {
 126                         break;
 127                 }
 128                 else {
 129                         *iter = key;
 130                         if (iter < screen.findbuf + WRLN_MAX_LINE_SIZE - 3)
 131                                 ++iter;
 132                 }
 133                 list_window_jump(lw, callback_fn, callback_data, search_str);
 134
 135                 /* repaint the list_window */
 136                 if (paint_callback != NULL)
 137                         list_window_paint2(lw, paint_callback, paint_data);
 138                 else
 139                         list_window_paint(lw, callback_fn, callback_data);
 140                 wrefresh(lw->w);
 141         }
 142
 143         char *temp = g_strdup(search_str);
 144         g_free(screen.findbuf);
 145         screen.findbuf = temp;
 146
 147         /* ncmpc should get the command */
 148         keyboard_unread(key);
 149 }