src/prompt.c

   1 /* Copyright (c) 2006-2014 Jonas Fonseca <jonas.fonseca@gmail.com>
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License as
   5  * published by the Free Software Foundation; either version 2 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include "tig/tig.h"
  15 #include "tig/view.h"
  16 #include "tig/draw.h"
  17 #include "tig/display.h"
  18 #include "tig/options.h"
  19 #include "tig/prompt.h"
  20 #include "tig/pager.h"
  21 #include "tig/types.h"
  22
  23 #ifdef HAVE_READLINE
  24 #include <readline/readline.h>
  25 #include <readline/history.h>
  26 #endif /* HAVE_READLINE */
  27
  28 static char *
  29 prompt_input(const char *prompt, struct input *input)
  30 {
  31         enum input_status status = INPUT_OK;
  32         unsigned char chars_length[SIZEOF_STR];
  33         struct key key;
  34         size_t promptlen = strlen(prompt);
  35         int pos = 0, chars = 0;
  36
  37         input->buf[pos] = 0;
  38
  39         while (status == INPUT_OK || status == INPUT_SKIP) {
  40
  41                 update_status("%s%.*s", prompt, pos, input->buf);
  42
  43                 if (get_input(pos + promptlen, &key, FALSE) == OK) {
  44                         int len = strlen(key.data.bytes);
  45
  46                         if (pos + len >= sizeof(input->buf)) {
  47                                 report("Input string too long");
  48                                 return NULL;
  49                         }
  50
  51                         string_ncopy_do(input->buf + pos, sizeof(input->buf) - pos, key.data.bytes, len);
  52                         pos += len;
  53                         chars_length[chars++] = len;
  54                         status = input->handler(input, &key);
  55                         if (status != INPUT_OK) {
  56                                 pos -= len;
  57                                 chars--;
  58                         } else {
  59                                 int changed_pos = strlen(input->buf);
  60
  61                                 if (changed_pos != pos) {
  62                                         pos = changed_pos;
  63                                         chars_length[chars - 1] = changed_pos - (pos - len);
  64                                 }
  65                         }
  66                 } else {
  67                         status = input->handler(input, &key);
  68                         if (status == INPUT_DELETE) {
  69                                 int len = chars_length[--chars];
  70
  71                                 pos -= len;
  72                                 status = INPUT_OK;
  73                         } else {
  74                                 int changed_pos = strlen(input->buf);
  75
  76                                 if (changed_pos != pos) {
  77                                         pos = changed_pos;
  78                                         chars_length[chars++] = changed_pos - pos;
  79                                 }
  80                         }
  81                 }
  82                 input->buf[pos] = 0;
  83         }
  84
  85         report_clear();
  86
  87         if (status == INPUT_CANCEL)
  88                 return NULL;
  89
  90         input->buf[pos++] = 0;
  91
  92         return input->buf;
  93 }
  94
  95 static enum input_status
  96 prompt_default_handler(struct input *input, struct key *key)
  97 {
  98         if (key->modifiers.multibytes)
  99                 return INPUT_SKIP;
 100
 101         switch (key->data.value) {
 102         case KEY_RETURN:
 103         case KEY_ENTER:
 104         case '\n':
 105                 return *input->buf ? INPUT_STOP : INPUT_CANCEL;
 106
 107         case KEY_BACKSPACE:
 108                 return *input->buf ? INPUT_DELETE : INPUT_CANCEL;
 109
 110         case KEY_ESC:
 111                 return INPUT_CANCEL;
 112
 113         default:
 114                 return INPUT_SKIP;
 115         }
 116 }
 117
 118 static enum input_status
 119 prompt_yesno_handler(struct input *input, struct key *key)
 120 {
 121         unsigned long c = key_to_unicode(key);
 122
 123         if (c == 'y' || c == 'Y')
 124                 return INPUT_STOP;
 125         if (c == 'n' || c == 'N')
 126                 return INPUT_CANCEL;
 127         return prompt_default_handler(input, key);
 128 }
 129
 130 bool
 131 prompt_yesno(const char *prompt)
 132 {
 133         char prompt2[SIZEOF_STR];
 134         struct input input = { prompt_yesno_handler, NULL };
 135
 136         if (!string_format(prompt2, "%s [Yy/Nn]", prompt))
 137                 return FALSE;
 138
 139         return !!prompt_input(prompt2, &input);
 140 }
 141
 142 struct incremental_input {
 143         struct input input;
 144         input_handler handler;
 145         bool edit_mode;
 146 };
 147
 148 static enum input_status
 149 read_prompt_handler(struct input *input, struct key *key)
 150 {
 151         struct incremental_input *incremental = (struct incremental_input *) input;
 152
 153         if (incremental->edit_mode && !key->modifiers.multibytes)
 154                 return prompt_default_handler(input, key);
 155
 156         if (!unicode_width(key_to_unicode(key), 8))
 157                 return INPUT_SKIP;
 158
 159         if (!incremental->handler)
 160                 return INPUT_OK;
 161
 162         return incremental->handler(input, key);
 163 }
 164
 165 char *
 166 read_prompt_incremental(const char *prompt, bool edit_mode, input_handler handler, void *data)
 167 {
 168         static struct incremental_input incremental = { { read_prompt_handler } };
 169
 170         incremental.input.data = data;
 171         incremental.handler = handler;
 172         incremental.edit_mode = edit_mode;
 173
 174         return prompt_input(prompt, (struct input *) &incremental);
 175 }
 176
 177 #ifdef HAVE_READLINE
 178 static void
 179 readline_display(void)
 180 {
 181         update_status("%s%s", rl_display_prompt, rl_line_buffer);
 182         wrefresh(status_win);
 183 }
 184
 185 static char *
 186 readline_variable_generator(const char *text, int state)
 187 {
 188         static const char *vars[] = {
 189 #define FORMAT_VAR(name, ifempty, initval) "%(" #name ")"
 190                 ARGV_ENV_INFO(FORMAT_VAR),
 191 #undef FORMAT_VAR
 192                 NULL
 193         };
 194
 195         static int index, len;
 196         const char *name;
 197         char *variable = NULL; /* No match */
 198
 199         /* If it is a new word to complete, initialize */
 200         if (!state) {
 201                 index = 0;
 202                 len = strlen(text);
 203         }
 204
 205         /* Return the next name which partially matches */
 206         while ((name = vars[index])) {
 207                 index++;
 208
 209                 /* Complete or format a variable */
 210                 if (strncmp(name, text, len) == 0) {
 211                         if (strlen(name) > len)
 212                                 variable = strdup(name);
 213                         else
 214                                 variable = argv_format_arg(&argv_env, text);
 215                         break;
 216                 }
 217         }
 218
 219         return variable;
 220 }
 221
 222 static char *
 223 readline_action_generator(const char *text, int state)
 224 {
 225         static const char *actions[] = {
 226                 "!",
 227                 "source",
 228                 "color",
 229                 "bind",
 230                 "set",
 231                 "toggle",
 232                 "save-display",
 233 #define REQ_GROUP(help)
 234 #define REQ_(req, help) #req
 235                 REQ_INFO,
 236 #undef  REQ_GROUP
 237 #undef  REQ_
 238                 NULL
 239         };
 240
 241         static int index, len;
 242         const char *name;
 243         char *match = NULL; /* No match */
 244
 245         /* If it is a new word to complete, initialize */
 246         if (!state) {
 247                 index = 0;
 248                 len = strlen(text);
 249         }
 250
 251         /* Return the next name which partially matches */
 252         while ((name = actions[index])) {
 253                 name = enum_name(name);
 254                 index++;
 255
 256                 if (strncmp(name, text, len) == 0) {
 257                         /* Ignore exact completion */
 258                         if (strlen(name) > len)
 259                                 match = strdup(name);
 260                         break;
 261                 }
 262         }
 263
 264         return match;
 265 }
 266
 267 static char *
 268 readline_set_generator(const char *text, int state)
 269 {
 270         static const char *words[] = {
 271 #define DEFINE_OPTION_NAME(name, type, flags) #name " = ",
 272                 OPTION_INFO(DEFINE_OPTION_NAME)
 273 #undef DEFINE_OPTION_NAME
 274                 NULL
 275         };
 276
 277         static int index, len;
 278         const char *name;
 279         char *match = NULL; /* No match */
 280
 281         /* If it is a new word to complete, initialize */
 282         if (!state) {
 283                 index = 0;
 284                 len = strlen(text);
 285         }
 286
 287         /* Return the next name which partially matches */
 288         while ((name = words[index])) {
 289                 name = enum_name(name);
 290                 index++;
 291
 292                 if (strncmp(name, text, len) == 0) {
 293                         /* Ignore exact completion */
 294                         if (strlen(name) > len)
 295                                 match = strdup(name);
 296                         break;
 297                 }
 298         }
 299
 300         return match;
 301 }
 302
 303 static char *
 304 readline_toggle_generator(const char *text, int state)
 305 {
 306         static const char **words;
 307         static int index, len;
 308         const char *name;
 309         char *match = NULL; /* No match */
 310
 311         if (!words) {
 312                 /* TODO: Only complete column options that are defined
 313                  * for the view. */
 314
 315 #define DEFINE_OPTION_WORD(name, type, flags) argv_append(&words, #name);
 316 #define DEFINE_COLUMN_OPTIONS_WORD(name, type, flags) #name,
 317 #define DEFINE_COLUMN_OPTIONS_WORDS(name, id, options) \
 318         if (VIEW_COLUMN_##id != VIEW_COLUMN_SECTION) { \
 319                 const char *vars[] = { \
 320                         options(DEFINE_COLUMN_OPTIONS_WORD) \
 321                 }; \
 322                 char buf[SIZEOF_STR]; \
 323                 int i; \
 324                 for (i = 0; i < ARRAY_SIZE(vars); i++) { \
 325                         if (enum_name_prefixed(buf, sizeof(buf), #name, vars[i])) \
 326                                 argv_append(&words, buf); \
 327                 } \
 328         }
 329
 330                 OPTION_INFO(DEFINE_OPTION_WORD)
 331                 COLUMN_OPTIONS(DEFINE_COLUMN_OPTIONS_WORDS);
 332         }
 333
 334         /* If it is a new word to complete, initialize */
 335         if (!state) {
 336                 index = 0;
 337                 len = strlen(text);
 338         }
 339
 340         /* Return the next name which partially matches */
 341         while ((name = words[index])) {
 342                 name = enum_name(name);
 343                 index++;
 344
 345                 if (strncmp(name, text, len) == 0) {
 346                         /* Ignore exact completion */
 347                         if (strlen(name) > len)
 348                                 match = strdup(name);
 349                         break;
 350                 }
 351         }
 352
 353         return match;
 354 }
 355
 356 static int
 357 readline_getc(FILE *stream)
 358 {
 359         return get_input_char();
 360 }
 361
 362 static char **
 363 readline_completion(const char *text, int start, int end)
 364 {
 365         /* Do not append a space after a completion */
 366         rl_completion_suppress_append = 1;
 367
 368         /*
 369          * If the word is at the start of the line,
 370          * then it is a tig action to complete.
 371          */
 372         if (start == 0)
 373                 return rl_completion_matches(text, readline_action_generator);
 374
 375         /*
 376          * If the line begins with "toggle", then we complete toggle options.
 377          */
 378         if (start >= 7 && strncmp(rl_line_buffer, "toggle ", 7) == 0)
 379                 return rl_completion_matches(text, readline_toggle_generator);
 380
 381         /*
 382          * If the line begins with "set", then we complete set options.
 383          * (unless it is already completed)
 384          */
 385         if (start >= 4 && strncmp(rl_line_buffer, "set ", 4) == 0 &&
 386                         !strchr(rl_line_buffer, '='))
 387                 return rl_completion_matches(text, readline_set_generator);
 388
 389         /*
 390          * Otherwise it might be a variable name...
 391          */
 392         if (strncmp(text, "%(", 2) == 0)
 393                 return rl_completion_matches(text, readline_variable_generator);
 394
 395         /*
 396          * ... or finally fall back to filename completion.
 397          */
 398         return NULL;
 399 }
 400
 401 static void
 402 readline_display_matches(char **matches, int num_matches, int max_length)
 403 {
 404         unsigned int i;
 405
 406         wmove(status_win, 0, 0);
 407         waddstr(status_win, "matches: ");
 408
 409         /* matches[0] is the incomplete word */
 410         for (i = 1; i < num_matches + 1; ++i) {
 411                 waddstr(status_win, matches[i]);
 412                 waddch(status_win, ' ');
 413         }
 414
 415         wgetch(status_win);
 416         wrefresh(status_win);
 417 }
 418
 419 static void
 420 readline_init(void)
 421 {
 422         /* Allow conditional parsing of the ~/.inputrc file. */
 423         rl_readline_name = "tig";
 424
 425         /* Word break caracters (we removed '(' to match variables) */
 426         rl_basic_word_break_characters = " \t\n\"\\'`@$><=;|&{";
 427
 428         /* Custom display function */
 429         rl_redisplay_function = readline_display;
 430         rl_getc_function = readline_getc;
 431
 432         /* Completion support */
 433         rl_attempted_completion_function = readline_completion;
 434
 435         rl_completion_display_matches_hook = readline_display_matches;
 436 }
 437
 438 char *
 439 read_prompt(const char *prompt)
 440 {
 441         static char *line = NULL;
 442
 443         if (line) {
 444                 free(line);
 445                 line = NULL;
 446         }
 447
 448         line = readline(prompt);
 449
 450         if (line && !*line) {
 451                 free(line);
 452                 line = NULL;
 453         }
 454
 455         if (line)
 456                 add_history(line);
 457
 458         return line;
 459 }
 460
 461 void
 462 prompt_init(void)
 463 {
 464         readline_init();
 465 }
 466 #else
 467 char *
 468 read_prompt(const char *prompt)
 469 {
 470         return read_prompt_incremental(prompt, TRUE, NULL, NULL);
 471 }
 472
 473 void
 474 prompt_init(void)
 475 {
 476 }
 477 #endif /* HAVE_READLINE */
 478
 479 bool
 480 prompt_menu(const char *prompt, const struct menu_item *items, int *selected)
 481 {
 482         enum input_status status = INPUT_OK;
 483         struct key key;
 484         int size = 0;
 485
 486         while (items[size].text)
 487                 size++;
 488
 489         assert(size > 0);
 490
 491         while (status == INPUT_OK) {
 492                 const struct menu_item *item = &items[*selected];
 493                 char hotkey[] = { '[', (char) item->hotkey, ']', ' ', 0 };
 494                 int i;
 495
 496                 update_status("%s (%d of %d) %s%s", prompt, *selected + 1, size,
 497                               item->hotkey ? hotkey : "", item->text);
 498
 499                 switch (get_input(COLS - 1, &key, FALSE)) {
 500                 case KEY_RETURN:
 501                 case KEY_ENTER:
 502                 case '\n':
 503                         status = INPUT_STOP;
 504                         break;
 505
 506                 case KEY_LEFT:
 507                 case KEY_UP:
 508                         *selected = *selected - 1;
 509                         if (*selected < 0)
 510                                 *selected = size - 1;
 511                         break;
 512
 513                 case KEY_RIGHT:
 514                 case KEY_DOWN:
 515                         *selected = (*selected + 1) % size;
 516                         break;
 517
 518                 case KEY_ESC:
 519                         status = INPUT_CANCEL;
 520                         break;
 521
 522                 default:
 523                         for (i = 0; items[i].text; i++)
 524                                 if (items[i].hotkey == key.data.bytes[0]) {
 525                                         *selected = i;
 526                                         status = INPUT_STOP;
 527                                         break;
 528                                 }
 529                 }
 530         }
 531
 532         report_clear();
 533
 534         return status != INPUT_CANCEL;
 535 }
 536
 537 struct prompt_toggle {
 538         const char *name;
 539         const char *type;
 540         enum view_flag flags;
 541         void *opt;
 542 };
 543
 544 static struct prompt_toggle option_toggles[] = {
 545 #define DEFINE_OPTION_TOGGLES(name, type, flags) { #name, #type, flags, &opt_ ## name },
 546         OPTION_INFO(DEFINE_OPTION_TOGGLES)
 547 };
 548
 549 static bool
 550 find_arg(const char *argv[], const char *arg)
 551 {
 552         int i;
 553
 554         for (i = 0; argv && argv[i]; i++)
 555                 if (!strcmp(argv[i], arg))
 556                         return TRUE;
 557         return FALSE;
 558 }
 559
 560 static enum status_code
 561 prompt_toggle_option(struct view *view, const char *argv[], const char *prefix,
 562                      struct prompt_toggle *toggle, enum view_flag *flags)
 563 {
 564         char name[SIZEOF_STR];
 565
 566         if (!enum_name_prefixed(name, sizeof(name), prefix, toggle->name))
 567                 return error("Failed to toggle option %s", toggle->name);
 568
 569         *flags = toggle->flags;
 570
 571         if (!strcmp(toggle->type, "bool")) {
 572                 bool *opt = toggle->opt;
 573
 574                 *opt = !*opt;
 575                 if (opt == &opt_mouse)
 576                         enable_mouse(*opt);
 577                 return success("set %s = %s", name, *opt ? "yes" : "no");
 578
 579         } else if (!strncmp(toggle->type, "enum", 4)) {
 580                 const char *type = toggle->type + STRING_SIZE("enum ");
 581                 enum author *opt = toggle->opt;
 582                 const struct enum_map *map = find_enum_map(type);
 583
 584                 *opt = (*opt + 1) % map->size;
 585                 return success("set %s = %s", name, enum_name(map->entries[*opt].name));
 586
 587         } else if (!strcmp(toggle->type, "int")) {
 588                 const char *arg = argv[2] ? argv[2] : "1";
 589                 int diff = atoi(arg);
 590                 int *opt = toggle->opt;
 591
 592                 if (!diff)
 593                         diff = *arg == '-' ? -1 : 1;
 594
 595                 if (opt == &opt_diff_context && *opt < 0)
 596                         *opt = -*opt;
 597                 if (opt == &opt_diff_context && diff < 0) {
 598                         if (!*opt)
 599                                 return error("Diff context cannot be less than zero");
 600                         if (*opt < -diff)
 601                                 diff = -*opt;
 602                 }
 603
 604                 if (strstr(name, "commit-title-overflow")) {
 605                         *opt = *opt ? -*opt : 50;
 606                         if (*opt < 0)
 607                                 return success("set %s = no", name);
 608                         diff = 0;
 609                 }
 610
 611                 *opt += diff;
 612                 return success("set %s = %d", name, *opt);
 613
 614         } else if (!strcmp(toggle->type, "double")) {
 615                 const char *arg = argv[2] ? argv[2] : "1.0";
 616                 double *opt = toggle->opt;
 617                 int sign = 1;
 618                 double diff;
 619
 620                 if (*arg == '-') {
 621                         sign = -1;
 622                         arg++;
 623                 }
 624
 625                 if (parse_step(&diff, arg) != SUCCESS)
 626                         diff = strtod(arg, NULL);
 627
 628                 *opt += sign * diff;
 629                 return success("set %s = %.2f", name, *opt);
 630
 631         } else if (!strcmp(toggle->type, "const char **")) {
 632                 const char ***opt = toggle->opt;
 633                 bool found = TRUE;
 634                 int i;
 635
 636                 if (argv_size(argv) <= 2) {
 637                         argv_free(*opt);
 638                         (*opt)[0] = NULL;
 639                         return SUCCESS;
 640                 }
 641
 642                 for (i = 2; argv[i]; i++) {
 643                         if (!find_arg(*opt, argv[i])) {
 644                                 found = FALSE;
 645                                 break;
 646                         }
 647                 }
 648
 649                 if (found) {
 650                         int next, pos;
 651
 652                         for (next = 0, pos = 0; (*opt)[pos]; pos++) {
 653                                 const char *arg = (*opt)[pos];
 654
 655                                 if (find_arg(argv + 2, arg)) {
 656                                         free((void *) arg);
 657                                         continue;
 658                                 }
 659                                 (*opt)[next++] = arg;
 660                         }
 661
 662                         (*opt)[next] = NULL;
 663
 664                 } else if (!argv_copy(opt, argv + 2)) {
 665                         return ERROR_OUT_OF_MEMORY;
 666                 }
 667                 return SUCCESS;
 668
 669         } else {
 670                 return error("Unsupported `:toggle %s` (%s)", name, toggle->type);
 671         }
 672 }
 673
 674 static struct prompt_toggle *
 675 find_prompt_toggle(struct prompt_toggle toggles[], size_t toggles_size,
 676                    const char *prefix, const char *name, size_t namelen)
 677 {
 678         char prefixed[SIZEOF_STR];
 679         int i;
 680
 681         if (*prefix && namelen == strlen(prefix) &&
 682             !string_enum_compare(prefix, name, namelen)) {
 683                 name = "display";
 684                 namelen = strlen(name);
 685         }
 686
 687         for (i = 0; i < toggles_size; i++) {
 688                 struct prompt_toggle *toggle = &toggles[i];
 689
 690                 if (namelen == strlen(toggle->name) &&
 691                     !string_enum_compare(toggle->name, name, namelen))
 692                         return toggle;
 693
 694                 if (enum_name_prefixed(prefixed, sizeof(prefixed), prefix, toggle->name) &&
 695                     namelen == strlen(prefixed) &&
 696                     !string_enum_compare(prefixed, name, namelen))
 697                         return toggle;
 698         }
 699
 700         return NULL;
 701 }
 702
 703 static enum status_code
 704 prompt_toggle(struct view *view, const char *argv[], enum view_flag *flags)
 705 {
 706         const char *option = argv[1];
 707         size_t optionlen = option ? strlen(option) : 0;
 708         struct prompt_toggle *toggle;
 709         struct view_column *column;
 710
 711         if (!option)
 712                 return error("%s", "No option name given to :toggle");
 713
 714         if (enum_equals_static("sort-field", option, optionlen) ||
 715             enum_equals_static("sort-order", option, optionlen)) {
 716                 if (!view_has_flags(view, VIEW_SORTABLE)) {
 717                         return error("Sorting is not yet supported for the %s view", view->name);
 718                 } else {
 719                         bool sort_field = enum_equals_static("sort-field", option, optionlen);
 720                         struct sort_state *sort = &view->sort;
 721
 722                         sort_view(view, sort_field);
 723                         return success("set %s = %s", option,
 724                                 sort_field ? view_column_name(get_sort_field(view))
 725                                            : sort->reverse ? "descending" : "ascending");
 726                 }
 727         }
 728
 729         toggle = find_prompt_toggle(option_toggles, ARRAY_SIZE(option_toggles),
 730                                     "", option, optionlen);
 731         if (toggle)
 732                 return prompt_toggle_option(view, argv, "", toggle, flags);
 733
 734 #define DEFINE_COLUMN_OPTIONS_TOGGLE(name, type, flags) \
 735         { #name, #type, flags, &opt->name },
 736
 737 #define DEFINE_COLUMN_OPTIONS_CHECK(name, id, options) \
 738         if (column->type == VIEW_COLUMN_##id) { \
 739                 struct name##_options *opt = &column->opt.name; \
 740                 struct prompt_toggle toggles[] = { \
 741                         options(DEFINE_COLUMN_OPTIONS_TOGGLE) \
 742                 }; \
 743                 toggle = find_prompt_toggle(toggles, ARRAY_SIZE(toggles), #name, option, optionlen); \
 744                 if (toggle) \
 745                         return prompt_toggle_option(view, argv, #name, toggle, flags); \
 746         }
 747
 748         for (column = view->columns; column; column = column->next) {
 749                 COLUMN_OPTIONS(DEFINE_COLUMN_OPTIONS_CHECK);
 750         }
 751
 752         return error("`:toggle %s` not supported", option);
 753 }
 754
 755 static void
 756 prompt_update_display(enum view_flag flags)
 757 {
 758         struct view *view;
 759         int i;
 760
 761         if (flags & VIEW_RESET_DISPLAY) {
 762                 resize_display();
 763                 redraw_display(TRUE);
 764         }
 765
 766         foreach_displayed_view(view, i) {
 767                 if (view_has_flags(view, flags) && view_can_refresh(view))
 768                         reload_view(view);
 769                 else
 770                         redraw_view(view);
 771         }
 772 }
 773
 774 enum request
 775 run_prompt_command(struct view *view, const char *argv[])
 776 {
 777         enum request request;
 778         const char *cmd = argv[0];
 779         size_t cmdlen = cmd ? strlen(cmd) : 0;
 780
 781         if (!cmd)
 782                 return REQ_NONE;
 783
 784         if (string_isnumber(cmd)) {
 785                 int lineno = view->pos.lineno + 1;
 786
 787                 if (parse_int(&lineno, cmd, 0, view->lines + 1) == SUCCESS) {
 788                         if (!lineno)
 789                                 lineno = 1;
 790                         select_view_line(view, lineno - 1);
 791                         report_clear();
 792                 } else {
 793                         report("Unable to parse '%s' as a line number", cmd);
 794                 }
 795         } else if (iscommit(cmd)) {
 796                 int lineno;
 797
 798                 if (!(view->ops->column_bits & view_column_bit(ID))) {
 799                         report("Jumping to commits is not supported by the %s view", view->name);
 800                         return REQ_NONE;
 801                 }
 802
 803                 for (lineno = 0; lineno < view->lines; lineno++) {
 804                         struct view_column_data column_data = {};
 805                         struct line *line = &view->line[lineno];
 806
 807                         if (view->ops->get_column_data(view, line, &column_data) &&
 808                             column_data.id &&
 809                             !strncasecmp(column_data.id, cmd, cmdlen)) {
 810                                 string_ncopy(view->env->search, cmd, cmdlen);
 811                                 select_view_line(view, lineno);
 812                                 report_clear();
 813                                 return REQ_NONE;
 814                         }
 815                 }
 816
 817                 report("Unable to find commit '%s'", view->env->search);
 818                 return REQ_NONE;
 819
 820         } else if (cmdlen > 1 && (cmd[0] == '/' || cmd[0] == '?')) {
 821                 char search[SIZEOF_STR];
 822
 823                 if (!argv_to_string(argv, search, sizeof(search), " ")) {
 824                         report("Failed to copy search string");
 825                         return REQ_NONE;
 826                 }
 827
 828                 if (!strcmp(search + 1, view->env->search))
 829                         return cmd[0] == '/' ? REQ_FIND_NEXT : REQ_FIND_PREV;
 830
 831                 string_ncopy(view->env->search, search + 1, strlen(search + 1));
 832                 return cmd[0] == '/' ? REQ_SEARCH : REQ_SEARCH_BACK;
 833
 834         } else if (cmdlen > 1 && cmd[0] == '!') {
 835                 struct view *next = &pager_view;
 836                 bool copied;
 837
 838                 /* Trim the leading '!'. */
 839                 argv[0] = cmd + 1;
 840                 copied = argv_format(view->env, &next->argv, argv, FALSE, TRUE);
 841                 argv[0] = cmd;
 842
 843                 if (!copied) {
 844                         report("Argument formatting failed");
 845                 } else {
 846                         /* When running random commands, initially show the
 847                          * command in the title. However, it maybe later be
 848                          * overwritten if a commit line is selected. */
 849                         argv_to_string(next->argv, next->ref, sizeof(next->ref), " ");
 850
 851                         next->dir = NULL;
 852                         open_pager_view(view, OPEN_PREPARED | OPEN_WITH_STDERR);
 853                 }
 854
 855         } else if (!strcmp(cmd, "save-display")) {
 856                 const char *path = argv[1] ? argv[1] : "tig-display.txt";
 857
 858                 if (!save_display(path))
 859                         report("Failed to save screen to %s", path);
 860                 else
 861                         report("Saved screen to %s", path);
 862
 863         } else if (!strcmp(cmd, "toggle")) {
 864                 enum view_flag flags = VIEW_NO_FLAGS;
 865                 enum status_code code = prompt_toggle(view, argv, &flags);
 866                 const char *action = get_status_message(code);
 867
 868                 if (code != SUCCESS) {
 869                         report("%s", action);
 870                         return REQ_NONE;
 871                 }
 872
 873                 prompt_update_display(flags);
 874
 875                 if (*action)
 876                         report("%s", action);
 877
 878         } else if (!strcmp(cmd, "script")) {
 879                 if (is_script_executing()) {
 880                         report("Scripts cannot be run from scripts");
 881                 } else if (!open_script(argv[1])) {
 882                         report("Failed to open %s", argv[1]);
 883                 }
 884
 885         } else {
 886                 struct key key = {};
 887                 enum status_code code;
 888                 enum view_flag flags = VIEW_NO_FLAGS;
 889
 890                 /* Try :<key> */
 891                 key.modifiers.multibytes = 1;
 892                 string_ncopy(key.data.bytes, cmd, cmdlen);
 893                 request = get_keybinding(view->keymap, &key, 1);
 894                 if (request != REQ_NONE)
 895                         return request;
 896
 897                 /* Try :<command> */
 898                 request = get_request(cmd);
 899                 if (request != REQ_UNKNOWN)
 900                         return request;
 901
 902                 code = set_option(argv[0], argv_size(argv + 1), &argv[1]);
 903                 if (code != SUCCESS) {
 904                         report("%s", get_status_message(code));
 905                         return REQ_NONE;
 906                 }
 907
 908                 if (!strcmp(cmd, "set")) {
 909                         struct prompt_toggle *toggle;
 910
 911                         toggle = find_prompt_toggle(option_toggles, ARRAY_SIZE(option_toggles),
 912                                                     "", argv[1], strlen(argv[1]));
 913
 914                         if (toggle)
 915                                 flags = toggle->flags;
 916                 }
 917
 918                 if (flags) {
 919                         prompt_update_display(flags);
 920
 921                 } else {
 922                         request = view_can_refresh(view) ? REQ_REFRESH : REQ_SCREEN_REDRAW;
 923                         if (!strcmp(cmd, "color"))
 924                                 init_colors();
 925                         resize_display();
 926                         redraw_display(TRUE);
 927                 }
 928
 929         }
 930         return REQ_NONE;
 931 }
 932
 933 enum request
 934 open_prompt(struct view *view)
 935 {
 936         char *cmd = read_prompt(":");
 937         const char *argv[SIZEOF_ARG] = { NULL };
 938         int argc = 0;
 939
 940         if (cmd && !argv_from_string(argv, &argc, cmd)) {
 941                 report("Too many arguments");
 942                 return REQ_NONE;
 943         }
 944
 945         return run_prompt_command(view, argv);
 946 }
 947
 948 /* vim: set ts=8 sw=8 noexpandtab: */