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 "i18n.h"
  25 #include "options.h"
  26 #include "ncmpc.h"
  27
  28 #define FIND_PROMPT  _("Find")
  29 #define RFIND_PROMPT _("Find backward")
  30 #define JUMP_PROMPT _("Jump")
  31
  32 /* query user for a string and find it in a list window */
  33 bool
  34 screen_find(struct list_window *lw, command_t findcmd,
  35             list_window_callback_fn_t callback_fn,
  36             void *callback_data)
  37 {
  38         bool found;
  39         const char *prompt = FIND_PROMPT;
  40
  41         const bool reversed =
  42                 findcmd == CMD_LIST_RFIND || findcmd == CMD_LIST_RFIND_NEXT;
  43         if (reversed)
  44                 prompt = RFIND_PROMPT;
  45
  46         switch (findcmd) {
  47         case CMD_LIST_FIND:
  48         case CMD_LIST_RFIND:
  49                 if (screen.findbuf) {
  50                         g_free(screen.findbuf);
  51                         screen.findbuf=NULL;
  52         }
  53                 /* fall through */
  54
  55         case CMD_LIST_FIND_NEXT:
  56         case CMD_LIST_RFIND_NEXT:
  57                 if (!screen.findbuf) {
  58                         char *value = options.find_show_last_pattern
  59                                 ? (char *) -1 : NULL;
  60                         screen.findbuf=screen_readln(prompt,
  61                                                      value,
  62                                                      &screen.find_history,
  63                                                      NULL);
  64                 }
  65
  66                 if (screen.findbuf == NULL)
  67                         return 1;
  68
  69                 found = reversed
  70                         ? list_window_rfind(lw,
  71                                             callback_fn, callback_data,
  72                                             screen.findbuf,
  73                                             options.find_wrap,
  74                                             options.bell_on_wrap)
  75                         : list_window_find(lw,
  76                                            callback_fn, callback_data,
  77                                            screen.findbuf,
  78                                            options.find_wrap,
  79                                            options.bell_on_wrap);
  80                 if (!found) {
  81                         screen_status_printf(_("Unable to find \'%s\'"),
  82                                              screen.findbuf);
  83                         screen_bell();
  84                 }
  85                 return 1;
  86         default:
  87                 break;
  88         }
  89         return 0;
  90 }
  91
  92 /* query user for a string and jump to the entry
  93  * which begins with this string while the users types */
  94 void
  95 screen_jump(struct list_window *lw,
  96             list_window_callback_fn_t callback_fn, void *callback_data,
  97             list_window_paint_callback_t paint_callback, void *paint_data)
  98 {
  99         const int WRLN_MAX_LINE_SIZE = 1024;
 100         int key = 65;
 101
 102         if (screen.findbuf) {
 103                 g_free(screen.findbuf);
 104                 screen.findbuf = NULL;
 105         }
 106         screen.findbuf = g_malloc0(WRLN_MAX_LINE_SIZE);
 107         /* In screen.findbuf is the whole string which is displayed in the status_window
 108          * and search_str is the string the user entered (without the prompt) */
 109         char *search_str = screen.findbuf + g_snprintf(screen.findbuf, WRLN_MAX_LINE_SIZE, "%s: ", JUMP_PROMPT);
 110         char *iter = search_str;
 111
 112         while(1) {
 113                 key = screen_getch(screen.findbuf);
 114                 /* if backspace or delete was pressed, process instead of ending loop */
 115                 if (key == KEY_BACKSPACE || key == KEY_DC) {
 116                         int i;
 117                         if (search_str <= g_utf8_find_prev_char(screen.findbuf, iter))
 118                                 iter = g_utf8_find_prev_char(screen.findbuf, iter);
 119                         for (i = 0; *(iter + i) != '\0'; i++)
 120                                 *(iter + i) = '\0';
 121                         continue;
 122                 }
 123                 /* if a control key was pressed, end loop */
 124                 else if (g_ascii_iscntrl(key) || key == KEY_NPAGE || key == KEY_PPAGE) {
 125                         break;
 126                 }
 127                 else {
 128                         *iter = key;
 129                         if (iter < screen.findbuf + WRLN_MAX_LINE_SIZE - 3)
 130                                 ++iter;
 131                 }
 132                 list_window_jump(lw, callback_fn, callback_data, search_str);
 133
 134                 /* repaint the list_window */
 135                 if (paint_callback != NULL)
 136                         list_window_paint2(lw, paint_callback, paint_data);
 137                 else
 138                         list_window_paint(lw, callback_fn, callback_data);
 139                 wrefresh(lw->w);
 140         }
 141
 142         /* ncmpc should get the command */
 143         ungetch(key);
 144
 145         command_t cmd;
 146         if ((cmd=get_keyboard_command()) != CMD_NONE)
 147                 do_input_event(cmd);
 148
 149         char *temp = g_strdup(search_str);
 150         g_free(screen.findbuf);
 151         screen.findbuf = temp;
 152 }