src/screen_keydef.c

   1 /* ncmpc (Ncurses MPD Client)
   2  * (c) 2004-2010 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_keydef.h"
  21 #include "screen_interface.h"
  22 #include "screen_status.h"
  23 #include "screen_find.h"
  24 #include "i18n.h"
  25 #include "conf.h"
  26 #include "screen.h"
  27 #include "screen_utils.h"
  28
  29 #include <assert.h>
  30 #include <errno.h>
  31 #include <string.h>
  32 #include <glib.h>
  33
  34 #define STATIC_ITEMS      0
  35 #define STATIC_SUB_ITEMS  1
  36 #define BUFSIZE 256
  37
  38 #define LIST_ITEM_APPLY()   ((unsigned)command_list_length)
  39 #define LIST_ITEM_SAVE()    (LIST_ITEM_APPLY()+1)
  40 #define LIST_LENGTH()       (LIST_ITEM_SAVE()+1)
  41
  42 #define LIST_ITEM_SAVE_LABEL  _("===> Apply & Save key bindings  ")
  43 #define LIST_ITEM_APPLY_LABEL _("===> Apply key bindings ")
  44
  45
  46 static struct list_window *lw;
  47 static unsigned command_list_length = 0;
  48 static command_definition_t *cmds = NULL;
  49
  50 static int subcmd = -1;
  51 static unsigned subcmd_length = 0;
  52 static unsigned subcmd_addpos = 0;
  53
  54 static int
  55 keybindings_changed(void)
  56 {
  57         command_definition_t *orginal_cmds = get_command_definitions();
  58         size_t size = command_list_length * sizeof(command_definition_t);
  59
  60         return memcmp(orginal_cmds, cmds, size);
  61 }
  62
  63 static void
  64 apply_keys(void)
  65 {
  66         if (keybindings_changed()) {
  67                 command_definition_t *orginal_cmds = get_command_definitions();
  68                 size_t size = command_list_length * sizeof(command_definition_t);
  69
  70                 memcpy(orginal_cmds, cmds, size);
  71                 screen_status_printf(_("You have new key bindings"));
  72         } else
  73                 screen_status_printf(_("Keybindings unchanged."));
  74 }
  75
  76 static int
  77 save_keys(void)
  78 {
  79         FILE *f;
  80         char *filename;
  81
  82         if (check_user_conf_dir()) {
  83                 screen_status_printf(_("Error: Unable to create directory ~/.ncmpc - %s"),
  84                                      strerror(errno));
  85                 screen_bell();
  86                 return -1;
  87         }
  88
  89         filename = get_user_key_binding_filename();
  90
  91         if ((f = fopen(filename,"w")) == NULL) {
  92                 screen_status_printf(_("Error: %s - %s"), filename, strerror(errno));
  93                 screen_bell();
  94                 g_free(filename);
  95                 return -1;
  96         }
  97
  98         if (write_key_bindings(f, KEYDEF_WRITE_HEADER))
  99                 screen_status_printf(_("Error: %s - %s"), filename, strerror(errno));
 100         else
 101                 screen_status_printf(_("Wrote %s"), filename);
 102
 103         g_free(filename);
 104         return fclose(f);
 105 }
 106
 107 static void
 108 check_subcmd_length(void)
 109 {
 110         subcmd_length = 0;
 111         while (subcmd_length < MAX_COMMAND_KEYS &&
 112                cmds[subcmd].keys[subcmd_length] > 0)
 113                 ++subcmd_length;
 114
 115         if (subcmd_length < MAX_COMMAND_KEYS) {
 116                 subcmd_addpos = subcmd_length;
 117                 subcmd_length++;
 118         } else
 119                 subcmd_addpos = 0;
 120         subcmd_length += STATIC_SUB_ITEMS;
 121         list_window_set_length(lw, subcmd_length);
 122 }
 123
 124 static void
 125 keydef_paint(void);
 126
 127 static void
 128 keydef_repaint(void)
 129 {
 130         keydef_paint();
 131         wrefresh(lw->w);
 132 }
 133
 134 static void
 135 delete_key(int cmd_index, int key_index)
 136 {
 137         int i = key_index+1;
 138
 139         screen_status_printf(_("Deleted"));
 140         while (i < MAX_COMMAND_KEYS && cmds[cmd_index].keys[i])
 141                 cmds[cmd_index].keys[key_index++] = cmds[cmd_index].keys[i++];
 142         cmds[cmd_index].keys[key_index] = 0;
 143         cmds[cmd_index].flags |= COMMAND_KEY_MODIFIED;
 144         check_subcmd_length();
 145
 146         /* repaint */
 147         keydef_repaint();
 148
 149         /* update key conflict flags */
 150         check_key_bindings(cmds, NULL, 0);
 151 }
 152
 153 static void
 154 assign_new_key(int cmd_index, int key_index)
 155 {
 156         int key;
 157         char *buf;
 158         command_t cmd;
 159
 160         buf = g_strdup_printf(_("Enter new key for %s: "), cmds[cmd_index].name);
 161         key = screen_getch(buf);
 162         g_free(buf);
 163
 164         if (key==ERR) {
 165                 screen_status_printf(_("Aborted"));
 166                 return;
 167         }
 168
 169         cmd = find_key_command(key, cmds);
 170         if (cmd != CMD_NONE && cmd != cmds[cmd_index].command) {
 171                 screen_status_printf(_("Error: key %s is already used for %s"),
 172                                      key2str(key),
 173                                      get_key_command_name(cmd));
 174                 screen_bell();
 175                 return;
 176         }
 177
 178         cmds[cmd_index].keys[key_index] = key;
 179         cmds[cmd_index].flags |= COMMAND_KEY_MODIFIED;
 180
 181         screen_status_printf(_("Assigned %s to %s"),
 182                              key2str(key),cmds[cmd_index].name);
 183         check_subcmd_length();
 184
 185         /* repaint */
 186         keydef_repaint();
 187
 188         /* update key conflict flags */
 189         check_key_bindings(cmds, NULL, 0);
 190 }
 191
 192 static const char *
 193 list_callback(unsigned idx, G_GNUC_UNUSED void *data)
 194 {
 195         static char buf[BUFSIZE];
 196
 197         if (subcmd < 0) {
 198                 if (idx == LIST_ITEM_APPLY())
 199                         return LIST_ITEM_APPLY_LABEL;
 200                 else if (idx == LIST_ITEM_SAVE())
 201                         return LIST_ITEM_SAVE_LABEL;
 202
 203                 assert(idx < (unsigned)command_list_length);
 204
 205                 return cmds[idx].name;
 206         } else {
 207                 if (idx == 0)
 208                         return "[..]";
 209                 idx--;
 210                 if (idx == subcmd_addpos) {
 211                         g_snprintf(buf, BUFSIZE, "%d. %s",
 212                                    idx + 1, _("Add new key"));
 213                         return buf;
 214                 }
 215
 216                 assert(idx < MAX_COMMAND_KEYS && cmds[subcmd].keys[idx] > 0);
 217
 218                 g_snprintf(buf,
 219                            BUFSIZE, "%d. %-20s   (%d) ",
 220                            idx + 1,
 221                            key2str(cmds[subcmd].keys[idx]),
 222                            cmds[subcmd].keys[idx]);
 223                 return buf;
 224         }
 225 }
 226
 227 static void
 228 keydef_init(WINDOW *w, int cols, int rows)
 229 {
 230         lw = list_window_init(w, cols, rows);
 231 }
 232
 233 static void
 234 keydef_resize(int cols, int rows)
 235 {
 236         list_window_resize(lw, cols, rows);
 237 }
 238
 239 static void
 240 keydef_exit(void)
 241 {
 242         list_window_free(lw);
 243         if (cmds)
 244                 g_free(cmds);
 245         cmds = NULL;
 246         lw = NULL;
 247 }
 248
 249 static void
 250 keydef_open(G_GNUC_UNUSED struct mpdclient *c)
 251 {
 252         if (cmds == NULL) {
 253                 command_definition_t *current_cmds = get_command_definitions();
 254                 size_t cmds_size;
 255
 256                 command_list_length = 0;
 257                 while (current_cmds[command_list_length].name)
 258                         command_list_length++;
 259
 260                 cmds_size = (command_list_length+1) * sizeof(command_definition_t);
 261                 cmds = g_malloc0(cmds_size);
 262                 memcpy(cmds, current_cmds, cmds_size);
 263                 command_list_length += STATIC_ITEMS;
 264         }
 265
 266         subcmd = -1;
 267         list_window_set_length(lw, LIST_LENGTH());
 268 }
 269
 270 static void
 271 keydef_close(void)
 272 {
 273         if (cmds && !keybindings_changed()) {
 274                 g_free(cmds);
 275                 cmds = NULL;
 276         } else
 277                 screen_status_printf(_("Note: Did you forget to \'Apply\' your changes?"));
 278 }
 279
 280 static const char *
 281 keydef_title(char *str, size_t size)
 282 {
 283         if (subcmd < 0)
 284                 return _("Edit key bindings");
 285
 286         g_snprintf(str, size, _("Edit keys for %s"), cmds[subcmd].name);
 287         return str;
 288 }
 289
 290 static void
 291 keydef_paint(void)
 292 {
 293         list_window_paint(lw, list_callback, NULL);
 294 }
 295
 296 static bool
 297 keydef_cmd(G_GNUC_UNUSED struct mpdclient *c, command_t cmd)
 298 {
 299         if (cmd == CMD_LIST_RANGE_SELECT)
 300                 return false;
 301
 302         if (list_window_cmd(lw, cmd)) {
 303                 keydef_repaint();
 304                 return true;
 305         }
 306
 307         switch(cmd) {
 308         case CMD_PLAY:
 309                 if (subcmd < 0) {
 310                         if (lw->selected == LIST_ITEM_APPLY())
 311                                 apply_keys();
 312                         else if (lw->selected == LIST_ITEM_SAVE()) {
 313                                 apply_keys();
 314                                 save_keys();
 315                         } else {
 316                                 subcmd = lw->selected;
 317                                 list_window_reset(lw);
 318                                 check_subcmd_length();
 319
 320                                 keydef_repaint();
 321                         }
 322                 } else {
 323                         if (lw->selected == 0) { /* up */
 324                                 list_window_set_length(lw, LIST_LENGTH());
 325                                 list_window_set_cursor(lw, subcmd);
 326                                 subcmd = -1;
 327
 328                                 keydef_repaint();
 329                         } else
 330                                 assign_new_key(subcmd,
 331                                                lw->selected - STATIC_SUB_ITEMS);
 332                 }
 333                 return true;
 334         case CMD_GO_PARENT_DIRECTORY:
 335                 if (subcmd >=0) {
 336                         list_window_set_length(lw, LIST_LENGTH());
 337                         list_window_set_cursor(lw, subcmd);
 338                         subcmd = -1;
 339
 340                         keydef_repaint();
 341                 }
 342                 break;
 343         case CMD_DELETE:
 344                 if (subcmd >= 0 && lw->selected >= STATIC_SUB_ITEMS)
 345                         delete_key(subcmd, lw->selected - STATIC_SUB_ITEMS);
 346                 return true;
 347                 break;
 348         case CMD_SAVE_PLAYLIST:
 349                 apply_keys();
 350                 save_keys();
 351                 break;
 352         case CMD_LIST_FIND:
 353         case CMD_LIST_RFIND:
 354         case CMD_LIST_FIND_NEXT:
 355         case CMD_LIST_RFIND_NEXT:
 356                 screen_find(lw, cmd, list_callback, NULL);
 357                 keydef_repaint();
 358                 return true;
 359
 360         default:
 361                 break;
 362         }
 363
 364         return false;
 365 }
 366
 367 const struct screen_functions screen_keydef = {
 368         .init = keydef_init,
 369         .exit = keydef_exit,
 370         .open = keydef_open,
 371         .close = keydef_close,
 372         .resize = keydef_resize,
 373         .paint = keydef_paint,
 374         .cmd = keydef_cmd,
 375         .get_title = keydef_title,
 376 };