contrib/dialog/editbox.c

   1 /*
   2  *  $Id: editbox.c,v 1.63 2015/01/25 22:57:49 tom Exp $
   3  *
   4  *  editbox.c -- implements the edit box
   5  *
   6  *  Copyright 2007-2013,2015 Thomas E. Dickey
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU Lesser General Public License, version 2.1
  10  *
  11  *  This program is distributed in the hope that it will be useful, but
  12  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this program; if not, write to
  18  *      Free Software Foundation, Inc.
  19  *      51 Franklin St., Fifth Floor
  20  *      Boston, MA 02110, USA.
  21  */
  22
  23 #include <dialog.h>
  24 #include <dlg_keys.h>
  25
  26 #include <sys/stat.h>
  27
  28 #define sTEXT -1
  29
  30 static void
  31 fail_list(void)
  32 {
  33     dlg_exiterr("File too large");
  34 }
  35
  36 static void
  37 grow_list(char ***list, int *have, int want)
  38 {
  39     if (want > *have) {
  40         size_t last = (size_t) *have;
  41         size_t need = (size_t) (want | 31) + 3;
  42         *have = (int) need;
  43         (*list) = dlg_realloc(char *, need, *list);
  44         if ((*list) == 0) {
  45             fail_list();
  46         } else {
  47             while (++last < need) {
  48                 (*list)[last] = 0;
  49             }
  50         }
  51     }
  52 }
  53
  54 static void
  55 load_list(const char *file, char ***list, int *rows)
  56 {
  57     FILE *fp;
  58     char *blob = 0;
  59     struct stat sb;
  60     unsigned n, pass;
  61     unsigned need;
  62     size_t size;
  63
  64     *list = 0;
  65     *rows = 0;
  66
  67     if (stat(file, &sb) < 0 ||
  68         (sb.st_mode & S_IFMT) != S_IFREG)
  69         dlg_exiterr("Not a file: %s", file);
  70
  71     size = (size_t) sb.st_size;
  72     if ((blob = dlg_malloc(char, size + 1)) == 0) {
  73         fail_list();
  74     } else {
  75         blob[size] = '\0';
  76
  77         if ((fp = fopen(file, "r")) == 0)
  78             dlg_exiterr("Cannot open: %s", file);
  79         size = fread(blob, sizeof(char), size, fp);
  80         fclose(fp);
  81
  82         for (pass = 0; pass < 2; ++pass) {
  83             int first = TRUE;
  84             need = 0;
  85             for (n = 0; n < size; ++n) {
  86                 if (first && pass) {
  87                     (*list)[need] = blob + n;
  88                     first = FALSE;
  89                 }
  90                 if (blob[n] == '\n') {
  91                     first = TRUE;
  92                     ++need;
  93                     if (pass)
  94                         blob[n] = '\0';
  95                 }
  96             }
  97             if (pass) {
  98                 if (need == 0) {
  99                     (*list)[0] = dlg_strclone("");
 100                     (*list)[1] = 0;
 101                 } else {
 102                     for (n = 0; n < need; ++n) {
 103                         (*list)[n] = dlg_strclone((*list)[n]);
 104                     }
 105                     (*list)[need] = 0;
 106                 }
 107             } else {
 108                 grow_list(list, rows, (int) need + 1);
 109             }
 110         }
 111         free(blob);
 112     }
 113 }
 114
 115 static void
 116 free_list(char ***list, int *rows)
 117 {
 118     if (*list != 0) {
 119         int n;
 120         for (n = 0; n < (*rows); ++n) {
 121             if ((*list)[n] != 0)
 122                 free((*list)[n]);
 123         }
 124         free(*list);
 125         *list = 0;
 126     }
 127     *rows = 0;
 128 }
 129
 130 /*
 131  * Display a single row in the editing window:
 132  * thisrow is the actual row number that's being displayed.
 133  * show_row is the row number that's highlighted for edit.
 134  * base_row is the first row number in the window
 135  */
 136 static bool
 137 display_one(WINDOW *win,
 138             char *text,
 139             int thisrow,
 140             int show_row,
 141             int base_row,
 142             int chr_offset)
 143 {
 144     bool result;
 145
 146     if (text != 0) {
 147         dlg_show_string(win,
 148                         text,
 149                         chr_offset,
 150                         ((thisrow == show_row)
 151                          ? form_active_text_attr
 152                          : form_text_attr),
 153                         thisrow - base_row,
 154                         0,
 155                         getmaxx(win),
 156                         FALSE,
 157                         FALSE);
 158         result = TRUE;
 159     } else {
 160         result = FALSE;
 161     }
 162     return result;
 163 }
 164
 165 static void
 166 display_all(WINDOW *win,
 167             char **list,
 168             int show_row,
 169             int firstrow,
 170             int lastrow,
 171             int chr_offset)
 172 {
 173     int limit = getmaxy(win);
 174     int row;
 175
 176     dlg_attr_clear(win, getmaxy(win), getmaxx(win), dialog_attr);
 177     if (lastrow - firstrow >= limit)
 178         lastrow = firstrow + limit;
 179     for (row = firstrow; row < lastrow; ++row) {
 180         if (!display_one(win, list[row],
 181                          row, show_row, firstrow,
 182                          (row == show_row) ? chr_offset : 0))
 183             break;
 184     }
 185 }
 186
 187 static int
 188 size_list(char **list)
 189 {
 190     int result = 0;
 191
 192     if (list != 0) {
 193         while (*list++ != 0) {
 194             ++result;
 195         }
 196     }
 197     return result;
 198 }
 199
 200 static bool
 201 scroll_to(int pagesize, int rows, int *base_row, int *this_row, int target)
 202 {
 203     bool result = FALSE;
 204
 205     if (target < *base_row) {
 206         if (target < 0) {
 207             if (*base_row == 0 && *this_row == 0) {
 208                 beep();
 209             } else {
 210                 *this_row = 0;
 211                 *base_row = 0;
 212                 result = TRUE;
 213             }
 214         } else {
 215             *this_row = target;
 216             *base_row = target;
 217             result = TRUE;
 218         }
 219     } else if (target >= rows) {
 220         if (*this_row < rows - 1) {
 221             *this_row = rows - 1;
 222             *base_row = rows - 1;
 223             result = TRUE;
 224         } else {
 225             beep();
 226         }
 227     } else if (target >= *base_row + pagesize) {
 228         *this_row = target;
 229         *base_row = target;
 230         result = TRUE;
 231     } else {
 232         *this_row = target;
 233         result = FALSE;
 234     }
 235     if (pagesize < rows) {
 236         if (*base_row + pagesize >= rows) {
 237             *base_row = rows - pagesize;
 238         }
 239     } else {
 240         *base_row = 0;
 241     }
 242     return result;
 243 }
 244
 245 static int
 246 col_to_chr_offset(const char *text, int col)
 247 {
 248     const int *cols = dlg_index_columns(text);
 249     const int *indx = dlg_index_wchars(text);
 250     bool found = FALSE;
 251     int result = 0;
 252     unsigned n;
 253     unsigned len = (unsigned) dlg_count_wchars(text);
 254
 255     for (n = 0; n < len; ++n) {
 256         if (cols[n] <= col && cols[n + 1] > col) {
 257             result = indx[n];
 258             found = TRUE;
 259             break;
 260         }
 261     }
 262     if (!found && len && cols[len] == col) {
 263         result = indx[len];
 264     }
 265     return result;
 266 }
 267
 268 #define SCROLL_TO(target) show_all = scroll_to(pagesize, listsize, &base_row, &thisrow, target)
 269
 270 #define PREV_ROW (*list)[thisrow - 1]
 271 #define THIS_ROW (*list)[thisrow]
 272 #define NEXT_ROW (*list)[thisrow + 1]
 273
 274 #define UPDATE_COL(input) col_offset = dlg_edit_offset(input, chr_offset, box_width)
 275
 276 static int
 277 widest_line(char **list)
 278 {
 279     int result = MAX_LEN;
 280     char *value;
 281
 282     if (list != 0) {
 283         while ((value = *list++) != 0) {
 284             int check = (int) strlen(value);
 285             if (check > result)
 286                 result = check;
 287         }
 288     }
 289     return result;
 290 }
 291
 292 #define NAVIGATE_BINDINGS \
 293         DLG_KEYS_DATA( DLGK_GRID_DOWN,  KEY_DOWN ), \
 294         DLG_KEYS_DATA( DLGK_GRID_RIGHT, KEY_RIGHT ), \
 295         DLG_KEYS_DATA( DLGK_GRID_LEFT,  KEY_LEFT ), \
 296         DLG_KEYS_DATA( DLGK_GRID_UP,    KEY_UP ), \
 297         DLG_KEYS_DATA( DLGK_FIELD_NEXT, TAB ), \
 298         DLG_KEYS_DATA( DLGK_FIELD_PREV, KEY_BTAB ), \
 299         DLG_KEYS_DATA( DLGK_PAGE_FIRST, KEY_HOME ), \
 300         DLG_KEYS_DATA( DLGK_PAGE_LAST,  KEY_END ), \
 301         DLG_KEYS_DATA( DLGK_PAGE_LAST,  KEY_LL ), \
 302         DLG_KEYS_DATA( DLGK_PAGE_NEXT,  KEY_NPAGE ), \
 303         DLG_KEYS_DATA( DLGK_PAGE_NEXT,  DLGK_MOUSE(KEY_NPAGE) ), \
 304         DLG_KEYS_DATA( DLGK_PAGE_PREV,  KEY_PPAGE ), \
 305         DLG_KEYS_DATA( DLGK_PAGE_PREV,  DLGK_MOUSE(KEY_PPAGE) )
 306 /*
 307  * Display a dialog box for editing a copy of a file
 308  */
 309 int
 310 dlg_editbox(const char *title,
 311             char ***list,
 312             int *rows,
 313             int height,
 314             int width)
 315 {
 316     /* *INDENT-OFF* */
 317     static DLG_KEYS_BINDING binding[] = {
 318         HELPKEY_BINDINGS,
 319         ENTERKEY_BINDINGS,
 320         NAVIGATE_BINDINGS,
 321         END_KEYS_BINDING
 322     };
 323     static DLG_KEYS_BINDING binding2[] = {
 324         INPUTSTR_BINDINGS,
 325         HELPKEY_BINDINGS,
 326         ENTERKEY_BINDINGS,
 327         NAVIGATE_BINDINGS,
 328         END_KEYS_BINDING
 329     };
 330     /* *INDENT-ON* */
 331
 332 #ifdef KEY_RESIZE
 333     int old_height = height;
 334     int old_width = width;
 335 #endif
 336     int x, y, box_y, box_x, box_height, box_width;
 337     int show_buttons;
 338     int thisrow, base_row, lastrow;
 339     int goal_col = -1;
 340     int col_offset = 0;
 341     int chr_offset = 0;
 342     int key, fkey, code;
 343     int pagesize;
 344     int listsize = size_list(*list);
 345     int result = DLG_EXIT_UNKNOWN;
 346     int state;
 347     size_t max_len = (size_t) dlg_max_input(widest_line(*list));
 348     char *input, *buffer;
 349     bool show_all, show_one, was_mouse;
 350     bool first_trace = TRUE;
 351     WINDOW *dialog;
 352     WINDOW *editing;
 353     DIALOG_VARS save_vars;
 354     const char **buttons = dlg_ok_labels();
 355     int mincols = (3 * COLS / 4);
 356
 357     dlg_save_vars(&save_vars);
 358     dialog_vars.separate_output = TRUE;
 359
 360     dlg_does_output();
 361
 362     buffer = dlg_malloc(char, max_len + 1);
 363     assert_ptr(buffer, "dlg_editbox");
 364
 365     thisrow = base_row = lastrow = 0;
 366
 367 #ifdef KEY_RESIZE
 368   retry:
 369 #endif
 370     show_buttons = TRUE;
 371     state = dialog_vars.default_button >= 0 ? dlg_default_button() : sTEXT;
 372     fkey = 0;
 373
 374     dlg_button_layout(buttons, &mincols);
 375     dlg_auto_size(title, "", &height, &width, 3 * LINES / 4, mincols);
 376     dlg_print_size(height, width);
 377     dlg_ctl_size(height, width);
 378
 379     x = dlg_box_x_ordinate(width);
 380     y = dlg_box_y_ordinate(height);
 381
 382     dialog = dlg_new_window(height, width, y, x);
 383     dlg_register_window(dialog, "editbox", binding);
 384     dlg_register_buttons(dialog, "editbox", buttons);
 385
 386     dlg_mouse_setbase(x, y);
 387
 388     dlg_draw_box2(dialog, 0, 0, height, width, dialog_attr, border_attr, border2_attr);
 389     dlg_draw_bottom_box2(dialog, border_attr, border2_attr, dialog_attr);
 390     dlg_draw_title(dialog, title);
 391
 392     (void) wattrset(dialog, dialog_attr);
 393
 394     /* Draw the editing field in a box */
 395     box_y = MARGIN + 0;
 396     box_x = MARGIN + 1;
 397     box_width = width - 2 - (2 * MARGIN);
 398     box_height = height - (4 * MARGIN);
 399
 400     dlg_draw_box(dialog,
 401                  box_y,
 402                  box_x,
 403                  box_height,
 404                  box_width,
 405                  border_attr, border2_attr);
 406     dlg_mouse_mkbigregion(box_y + MARGIN,
 407                           box_x + MARGIN,
 408                           box_height - (2 * MARGIN),
 409                           box_width - (2 * MARGIN),
 410                           KEY_MAX, 1, 1, 3);
 411     editing = dlg_sub_window(dialog,
 412                              box_height - (2 * MARGIN),
 413                              box_width - (2 * MARGIN),
 414                              getbegy(dialog) + box_y + 1,
 415                              getbegx(dialog) + box_x + 1);
 416     dlg_register_window(editing, "editbox2", binding2);
 417
 418     show_all = TRUE;
 419     show_one = FALSE;
 420     pagesize = getmaxy(editing);
 421
 422     while (result == DLG_EXIT_UNKNOWN) {
 423         int edit = 0;
 424
 425         if (show_all) {
 426             display_all(editing, *list, thisrow, base_row, listsize, chr_offset);
 427             display_one(editing, THIS_ROW,
 428                         thisrow, thisrow, base_row, chr_offset);
 429             show_all = FALSE;
 430             show_one = TRUE;
 431         } else {
 432             if (thisrow != lastrow) {
 433                 display_one(editing, (*list)[lastrow],
 434                             lastrow, thisrow, base_row, 0);
 435                 show_one = TRUE;
 436             }
 437         }
 438         if (show_one) {
 439             display_one(editing, THIS_ROW,
 440                         thisrow, thisrow, base_row, chr_offset);
 441             getyx(editing, y, x);
 442             dlg_draw_scrollbar(dialog,
 443                                base_row,
 444                                base_row,
 445                                base_row + pagesize,
 446                                listsize,
 447                                box_x,
 448                                box_x + getmaxx(editing),
 449                                box_y + 0,
 450                                box_y + getmaxy(editing) + 1,
 451                                border2_attr,
 452                                border_attr);
 453             wmove(editing, y, x);
 454             show_one = FALSE;
 455         }
 456         lastrow = thisrow;
 457         input = THIS_ROW;
 458
 459         /*
 460          * The last field drawn determines where the cursor is shown:
 461          */
 462         if (show_buttons) {
 463             show_buttons = FALSE;
 464             UPDATE_COL(input);
 465             if (state != sTEXT) {
 466                 display_one(editing, input, thisrow,
 467                             -1, base_row, 0);
 468                 wrefresh(editing);
 469             }
 470             dlg_draw_buttons(dialog,
 471                              height - 2,
 472                              0,
 473                              buttons,
 474                              (state != sTEXT) ? state : 99,
 475                              FALSE,
 476                              width);
 477             if (state == sTEXT) {
 478                 display_one(editing, input, thisrow,
 479                             thisrow, base_row, chr_offset);
 480             }
 481         }
 482
 483         if (first_trace) {
 484             first_trace = FALSE;
 485             dlg_trace_win(dialog);
 486         }
 487
 488         key = dlg_mouse_wgetch((state == sTEXT) ? editing : dialog, &fkey);
 489         if (key == ERR) {
 490             result = DLG_EXIT_ERROR;
 491             break;
 492         } else if (key == ESC) {
 493             result = DLG_EXIT_ESC;
 494             break;
 495         }
 496         if (state != sTEXT) {
 497             if (dlg_result_key(key, fkey, &result))
 498                 break;
 499         }
 500
 501         was_mouse = (fkey && is_DLGK_MOUSE(key));
 502         if (was_mouse)
 503             key -= M_EVENT;
 504
 505         /*
 506          * Handle mouse clicks first, since we want to know if this is a
 507          * button, or something that dlg_edit_string() should handle.
 508          */
 509         if (fkey
 510             && was_mouse
 511             && (code = dlg_ok_buttoncode(key)) >= 0) {
 512             result = code;
 513             continue;
 514         }
 515
 516         if (was_mouse
 517             && (key >= KEY_MAX)) {
 518             int wide = getmaxx(editing);
 519             int cell = key - KEY_MAX;
 520             thisrow = (cell / wide) + base_row;
 521             col_offset = (cell % wide);
 522             chr_offset = col_to_chr_offset(THIS_ROW, col_offset);
 523             show_one = TRUE;
 524             if (state != sTEXT) {
 525                 state = sTEXT;
 526                 show_buttons = TRUE;
 527             }
 528             continue;
 529         } else if (was_mouse && key >= KEY_MIN) {
 530             key = dlg_lookup_key(dialog, key, &fkey);
 531         }
 532
 533         if (state == sTEXT) {   /* editing box selected */
 534             /*
 535              * Intercept scrolling keys that dlg_edit_string() does not
 536              * understand.
 537              */
 538             if (fkey) {
 539                 bool moved = TRUE;
 540
 541                 switch (key) {
 542                 case DLGK_GRID_UP:
 543                     SCROLL_TO(thisrow - 1);
 544                     break;
 545                 case DLGK_GRID_DOWN:
 546                     SCROLL_TO(thisrow + 1);
 547                     break;
 548                 case DLGK_PAGE_FIRST:
 549                     SCROLL_TO(0);
 550                     break;
 551                 case DLGK_PAGE_LAST:
 552                     SCROLL_TO(listsize);
 553                     break;
 554                 case DLGK_PAGE_NEXT:
 555                     SCROLL_TO(base_row + pagesize);
 556                     break;
 557                 case DLGK_PAGE_PREV:
 558                     if (thisrow > base_row) {
 559                         SCROLL_TO(base_row);
 560                     } else {
 561                         SCROLL_TO(base_row - pagesize);
 562                     }
 563                     break;
 564                 case DLGK_DELETE_LEFT:
 565                     if (chr_offset == 0) {
 566                         if (thisrow == 0) {
 567                             beep();
 568                         } else {
 569                             size_t len = (strlen(THIS_ROW) +
 570                                           strlen(PREV_ROW) + 1);
 571                             char *tmp = dlg_malloc(char, len);
 572
 573                             assert_ptr(tmp, "dlg_editbox");
 574
 575                             chr_offset = dlg_count_wchars(PREV_ROW);
 576                             UPDATE_COL(PREV_ROW);
 577                             goal_col = col_offset;
 578
 579                             sprintf(tmp, "%s%s", PREV_ROW, THIS_ROW);
 580                             if (len > max_len)
 581                                 tmp[max_len] = '\0';
 582
 583                             free(PREV_ROW);
 584                             PREV_ROW = tmp;
 585                             for (y = thisrow; y < listsize; ++y) {
 586                                 (*list)[y] = (*list)[y + 1];
 587                             }
 588                             --listsize;
 589                             --thisrow;
 590                             SCROLL_TO(thisrow);
 591
 592                             show_all = TRUE;
 593                         }
 594                     } else {
 595                         /* dlg_edit_string() can handle this case */
 596                         moved = FALSE;
 597                     }
 598                     break;
 599                 default:
 600                     moved = FALSE;
 601                     break;
 602                 }
 603                 if (moved) {
 604                     if (thisrow != lastrow) {
 605                         if (goal_col < 0)
 606                             goal_col = col_offset;
 607                         chr_offset = col_to_chr_offset(THIS_ROW, goal_col);
 608                     } else {
 609                         UPDATE_COL(THIS_ROW);
 610                     }
 611                     continue;
 612                 }
 613             }
 614             strncpy(buffer, input, max_len - 1)[max_len - 1] = '\0';
 615             edit = dlg_edit_string(buffer, &chr_offset, key, fkey, FALSE);
 616
 617             if (edit) {
 618                 goal_col = UPDATE_COL(input);
 619                 if (strcmp(input, buffer)) {
 620                     free(input);
 621                     THIS_ROW = dlg_strclone(buffer);
 622                     input = THIS_ROW;
 623                 }
 624                 display_one(editing, input, thisrow,
 625                             thisrow, base_row, chr_offset);
 626                 continue;
 627             }
 628         }
 629
 630         /* handle non-functionkeys */
 631         if (!fkey && (code = dlg_char_to_button(key, buttons)) >= 0) {
 632             dlg_del_window(dialog);
 633             result = dlg_ok_buttoncode(code);
 634             continue;
 635         }
 636
 637         /* handle functionkeys */
 638         if (fkey) {
 639             switch (key) {
 640             case DLGK_GRID_UP:
 641             case DLGK_GRID_LEFT:
 642             case DLGK_FIELD_PREV:
 643                 show_buttons = TRUE;
 644                 state = dlg_prev_ok_buttonindex(state, sTEXT);
 645                 break;
 646             case DLGK_GRID_RIGHT:
 647             case DLGK_GRID_DOWN:
 648             case DLGK_FIELD_NEXT:
 649                 show_buttons = TRUE;
 650                 state = dlg_next_ok_buttonindex(state, sTEXT);
 651                 break;
 652             case DLGK_ENTER:
 653                 if (state == sTEXT) {
 654                     const int *indx = dlg_index_wchars(THIS_ROW);
 655                     int split = indx[chr_offset];
 656                     char *tmp = dlg_strclone(THIS_ROW + split);
 657
 658                     assert_ptr(tmp, "dlg_editbox");
 659                     grow_list(list, rows, listsize + 1);
 660                     ++listsize;
 661                     for (y = listsize; y > thisrow; --y) {
 662                         (*list)[y] = (*list)[y - 1];
 663                     }
 664                     THIS_ROW[split] = '\0';
 665                     ++thisrow;
 666                     chr_offset = 0;
 667                     col_offset = 0;
 668                     THIS_ROW = tmp;
 669                     SCROLL_TO(thisrow);
 670                     show_all = TRUE;
 671                 } else {
 672                     result = dlg_ok_buttoncode(state);
 673                 }
 674                 break;
 675 #ifdef KEY_RESIZE
 676             case KEY_RESIZE:
 677                 /* reset data */
 678                 height = old_height;
 679                 width = old_width;
 680                 /* repaint */
 681                 dlg_clear();
 682                 dlg_del_window(editing);
 683                 dlg_del_window(dialog);
 684                 refresh();
 685                 dlg_mouse_free_regions();
 686                 goto retry;
 687 #endif
 688             default:
 689                 beep();
 690                 break;
 691             }
 692         } else {
 693             if ((key == ' ') && (state != sTEXT)) {
 694                 result = dlg_ok_buttoncode(state);
 695             } else {
 696                 beep();
 697             }
 698         }
 699     }
 700
 701     dlg_unregister_window(editing);
 702     dlg_del_window(editing);
 703     dlg_del_window(dialog);
 704     dlg_mouse_free_regions();
 705
 706     /*
 707      * The caller's copy of the (*list)[] array has been updated, but for
 708      * consistency with the other widgets, we put the "real" result in
 709      * the output buffer.
 710      */
 711     if (result == DLG_EXIT_OK) {
 712         int n;
 713         for (n = 0; n < listsize; ++n) {
 714             dlg_add_result((*list)[n]);
 715             dlg_add_separator();
 716         }
 717         dlg_add_last_key(-1);
 718     }
 719     free(buffer);
 720     dlg_restore_vars(&save_vars);
 721     return result;
 722 }
 723
 724 int
 725 dialog_editbox(const char *title, const char *file, int height, int width)
 726 {
 727     int result;
 728     char **list;
 729     int rows;
 730
 731     load_list(file, &list, &rows);
 732     result = dlg_editbox(title, &list, &rows, height, width);
 733     free_list(&list, &rows);
 734     return result;
 735 }