src/prompt.c

   1 /* Copyright (c) 2006-2015 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         int last_buf_length = promptlen ? -1 : promptlen;
  37
  38         input->buf[0] = 0;
  39
  40         while (status == INPUT_OK || status == INPUT_SKIP) {
  41                 int buf_length = strlen(input->buf) + promptlen;
  42                 int offset = pos || buf_length != last_buf_length ? pos + promptlen : -1;
  43
  44                 last_buf_length = buf_length;
  45                 if (offset >= 0)
  46                         update_status("%s%.*s", prompt, pos, input->buf);
  47
  48                 if (get_input(offset, &key) == OK) {
  49                         int len = strlen(key.data.bytes);
  50
  51                         if (pos + len >= sizeof(input->buf)) {
  52                                 report("Input string too long");
  53                                 return NULL;
  54                         }
  55
  56                         string_ncopy_do(input->buf + pos, sizeof(input->buf) - pos, key.data.bytes, len);
  57                         pos += len;
  58                         chars_length[chars++] = len;
  59                         status = input->handler(input, &key);
  60                         if (status != INPUT_OK) {
  61                                 pos -= len;
  62                                 chars--;
  63                         } else {
  64                                 int changed_pos = strlen(input->buf);
  65
  66                                 if (changed_pos != pos) {
  67                                         pos = changed_pos;
  68                                         chars_length[chars - 1] = changed_pos - (pos - len);
  69                                 }
  70                         }
  71                 } else {
  72                         status = input->handler(input, &key);
  73                         if (status == INPUT_DELETE) {
  74                                 int len = chars_length[--chars];
  75
  76                                 pos -= len;
  77                                 status = INPUT_OK;
  78                         } else {
  79                                 int changed_pos = strlen(input->buf);
  80
  81                                 if (changed_pos != pos) {
  82                                         pos = changed_pos;
  83                                         chars_length[chars++] = changed_pos - pos;
  84                                 }
  85                         }
  86                 }
  87                 input->buf[pos] = 0;
  88         }
  89
  90         report_clear();
  91
  92         if (status == INPUT_CANCEL)
  93                 return NULL;
  94
  95         input->buf[pos++] = 0;
  96
  97         return input->buf;
  98 }
  99
 100 enum input_status
 101 prompt_default_handler(struct input *input, struct key *key)
 102 {
 103         switch (key_to_value(key)) {
 104         case KEY_RETURN:
 105         case KEY_ENTER:
 106         case '\n':
 107                 return *input->buf ? INPUT_STOP : INPUT_CANCEL;
 108
 109         case KEY_BACKSPACE:
 110                 return *input->buf ? INPUT_DELETE : INPUT_CANCEL;
 111
 112         case KEY_ESC:
 113                 return INPUT_CANCEL;
 114
 115         default:
 116                 return INPUT_SKIP;
 117         }
 118 }
 119
 120 static enum input_status
 121 prompt_yesno_handler(struct input *input, struct key *key)
 122 {
 123         unsigned long c = key_to_unicode(key);
 124
 125         if (c == 'y' || c == 'Y')
 126                 return INPUT_STOP;
 127         if (c == 'n' || c == 'N')
 128                 return INPUT_CANCEL;
 129         return prompt_default_handler(input, key);
 130 }
 131
 132 bool
 133 prompt_yesno(const char *prompt)
 134 {
 135         char prompt2[SIZEOF_STR];
 136         struct input input = { prompt_yesno_handler, NULL };
 137
 138         if (!string_format(prompt2, "%s [Yy/Nn]", prompt))
 139                 return FALSE;
 140
 141         return !!prompt_input(prompt2, &input);
 142 }
 143
 144 struct incremental_input {
 145         struct input input;
 146         input_handler handler;
 147         bool edit_mode;
 148 };
 149
 150 static enum input_status
 151 read_prompt_handler(struct input *input, struct key *key)
 152 {
 153         struct incremental_input *incremental = (struct incremental_input *) input;
 154
 155         if (incremental->edit_mode && !key->modifiers.multibytes)
 156                 return prompt_default_handler(input, key);
 157
 158         if (!unicode_width(key_to_unicode(key), 8))
 159                 return INPUT_SKIP;
 160
 161         if (!incremental->handler)
 162                 return INPUT_OK;
 163
 164         return incremental->handler(input, key);
 165 }
 166
 167 char *
 168 read_prompt_incremental(const char *prompt, bool edit_mode, input_handler handler, void *data)
 169 {
 170         static struct incremental_input incremental = { { read_prompt_handler } };
 171
 172         incremental.input.data = data;
 173         incremental.handler = handler;
 174         incremental.edit_mode = edit_mode;
 175
 176         return prompt_input(prompt, (struct input *) &incremental);
 177 }
 178
 179 #ifdef HAVE_READLINE
 180 static void
 181 readline_display(void)
 182 {
 183         update_status("%s%s", rl_display_prompt, rl_line_buffer);
 184         wmove(status_win, 0, strlen(rl_display_prompt) + rl_point);
 185         wrefresh(status_win);
 186 }
 187
 188 static char *
 189 readline_variable_generator(const char *text, int state)
 190 {
 191         static const char *vars[] = {
 192 #define FORMAT_VAR(type, name, ifempty, initval) "%(" #name ")",
 193                 ARGV_ENV_INFO(FORMAT_VAR)
 194 #undef FORMAT_VAR
 195                 NULL
 196         };
 197
 198         static int index, len;
 199         const char *name;
 200         char *variable = NULL; /* No match */
 201
 202         /* If it is a new word to complete, initialize */
 203         if (!state) {
 204                 index = 0;
 205                 len = strlen(text);
 206         }
 207
 208         /* Return the next name which partially matches */
 209         while ((name = vars[index])) {
 210                 index++;
 211
 212                 /* Complete or format a variable */
 213                 if (strncmp(name, text, len) == 0) {
 214                         if (strlen(name) > len)
 215                                 variable = strdup(name);
 216                         else
 217                                 variable = argv_format_arg(&argv_env, text);
 218                         break;
 219                 }
 220         }
 221
 222         return variable;
 223 }
 224
 225 static char *
 226 readline_action_generator(const char *text, int state)
 227 {
 228         static const char *actions[] = {
 229                 "!",
 230                 "source",
 231                 "color",
 232                 "bind",
 233                 "set",
 234                 "toggle",
 235                 "save-display",
 236                 "save-options",
 237                 "exec",
 238 #define REQ_GROUP(help)
 239 #define REQ_(req, help) #req
 240                 REQ_INFO,
 241 #undef  REQ_GROUP
 242 #undef  REQ_
 243                 NULL
 244         };
 245
 246         static int index, len;
 247         const char *name;
 248         char *match = NULL; /* No match */
 249
 250         /* If it is a new word to complete, initialize */
 251         if (!state) {
 252                 index = 0;
 253                 len = strlen(text);
 254         }
 255
 256         /* Return the next name which partially matches */
 257         while ((name = actions[index])) {
 258                 name = enum_name(name);
 259                 index++;
 260
 261                 if (strncmp(name, text, len) == 0) {
 262                         /* Ignore exact completion */
 263                         if (strlen(name) > len)
 264                                 match = strdup(name);
 265                         break;
 266                 }
 267         }
 268
 269         return match;
 270 }
 271
 272 static char *
 273 readline_set_generator(const char *text, int state)
 274 {
 275         static const char *words[] = {
 276 #define DEFINE_OPTION_NAME(name, type, flags) #name " = ",
 277                 OPTION_INFO(DEFINE_OPTION_NAME)
 278 #undef DEFINE_OPTION_NAME
 279                 NULL
 280         };
 281
 282         static int index, len;
 283         const char *name;
 284         char *match = NULL; /* No match */
 285
 286         /* If it is a new word to complete, initialize */
 287         if (!state) {
 288                 index = 0;
 289                 len = strlen(text);
 290         }
 291
 292         /* Return the next name which partially matches */
 293         while ((name = words[index])) {
 294                 name = enum_name(name);
 295                 index++;
 296
 297                 if (strncmp(name, text, len) == 0) {
 298                         /* Ignore exact completion */
 299                         if (strlen(name) > len)
 300                                 match = strdup(name);
 301                         break;
 302                 }
 303         }
 304
 305         return match;
 306 }
 307
 308 static char *
 309 readline_toggle_generator(const char *text, int state)
 310 {
 311         static const char **words;
 312         static int index, len;
 313         const char *name;
 314         char *match = NULL; /* No match */
 315
 316         if (!words) {
 317                 /* TODO: Only complete column options that are defined
 318                  * for the view. */
 319
 320 #define DEFINE_OPTION_WORD(name, type, flags) argv_append(&words, #name);
 321 #define DEFINE_COLUMN_OPTIONS_WORD(name, type, flags) #name,
 322 #define DEFINE_COLUMN_OPTIONS_WORDS(name, id, options) \
 323         if (VIEW_COLUMN_##id != VIEW_COLUMN_SECTION) { \
 324                 const char *vars[] = { \
 325                         options(DEFINE_COLUMN_OPTIONS_WORD) \
 326                 }; \
 327                 char buf[SIZEOF_STR]; \
 328                 int i; \
 329                 for (i = 0; i < ARRAY_SIZE(vars); i++) { \
 330                         if (enum_name_prefixed(buf, sizeof(buf), #name, vars[i])) \
 331                                 argv_append(&words, buf); \
 332                 } \
 333         }
 334
 335                 OPTION_INFO(DEFINE_OPTION_WORD)
 336                 COLUMN_OPTIONS(DEFINE_COLUMN_OPTIONS_WORDS);
 337         }
 338
 339         /* If it is a new word to complete, initialize */
 340         if (!state) {
 341                 index = 0;
 342                 len = strlen(text);
 343         }
 344
 345         /* Return the next name which partially matches */
 346         while ((name = words[index])) {
 347                 name = enum_name(name);
 348                 index++;
 349
 350                 if (strncmp(name, text, len) == 0) {
 351                         /* Ignore exact completion */
 352                         if (strlen(name) > len)
 353                                 match = strdup(name);
 354                         break;
 355                 }
 356         }
 357
 358         return match;
 359 }
 360
 361 static int
 362 readline_getc(FILE *stream)
 363 {
 364         return get_input_char();
 365 }
 366
 367 static char **
 368 readline_completion(const char *text, int start, int end)
 369 {
 370         /* Do not append a space after a completion */
 371         rl_completion_suppress_append = 1;
 372
 373         /*
 374          * If the word is at the start of the line,
 375          * then it is a tig action to complete.
 376          */
 377         if (start == 0)
 378                 return rl_completion_matches(text, readline_action_generator);
 379
 380         /*
 381          * If the line begins with "toggle", then we complete toggle options.
 382          */
 383         if (start >= 7 && strncmp(rl_line_buffer, "toggle ", 7) == 0)
 384                 return rl_completion_matches(text, readline_toggle_generator);
 385
 386         /*
 387          * If the line begins with "set", then we complete set options.
 388          * (unless it is already completed)
 389          */
 390         if (start >= 4 && strncmp(rl_line_buffer, "set ", 4) == 0 &&
 391                         !strchr(rl_line_buffer, '='))
 392                 return rl_completion_matches(text, readline_set_generator);
 393
 394         /*
 395          * Otherwise it might be a variable name...
 396          */
 397         if (strncmp(text, "%(", 2) == 0)
 398                 return rl_completion_matches(text, readline_variable_generator);
 399
 400         /*
 401          * ... or finally fall back to filename completion.
 402          */
 403         return NULL;
 404 }
 405
 406 static void
 407 readline_display_matches(char **matches, int num_matches, int max_length)
 408 {
 409         unsigned int i;
 410
 411         wmove(status_win, 0, 0);
 412         waddstr(status_win, "matches: ");
 413
 414         /* matches[0] is the incomplete word */
 415         for (i = 1; i < num_matches + 1; ++i) {
 416                 waddstr(status_win, matches[i]);
 417                 waddch(status_win, ' ');
 418         }
 419
 420         wgetch(status_win);
 421         wrefresh(status_win);
 422 }
 423
 424 static void
 425 readline_init(void)
 426 {
 427         /* Allow conditional parsing of the ~/.inputrc file. */
 428         rl_readline_name = "tig";
 429
 430         /* Word break caracters (we removed '(' to match variables) */
 431         rl_basic_word_break_characters = " \t\n\"\\'`@$><=;|&{";
 432
 433         /* Custom display function */
 434         rl_redisplay_function = readline_display;
 435         rl_getc_function = readline_getc;
 436
 437         /* Completion support */
 438         rl_attempted_completion_function = readline_completion;
 439
 440         rl_completion_display_matches_hook = readline_display_matches;
 441 }
 442
 443 char *
 444 read_prompt(const char *prompt)
 445 {
 446         static char *line = NULL;
 447
 448         if (line) {
 449                 free(line);
 450                 line = NULL;
 451         }
 452
 453         line = readline(prompt);
 454
 455         if (line && !*line) {
 456                 free(line);
 457                 line = NULL;
 458         }
 459
 460         if (line)
 461                 add_history(line);
 462
 463         return line;
 464 }
 465
 466 void
 467 prompt_init(void)
 468 {
 469         readline_init();
 470 }
 471 #else
 472 char *
 473 read_prompt(const char *prompt)
 474 {
 475         return read_prompt_incremental(prompt, TRUE, NULL, NULL);
 476 }
 477
 478 void
 479 prompt_init(void)
 480 {
 481 }
 482 #endif /* HAVE_READLINE */
 483
 484 bool
 485 prompt_menu(const char *prompt, const struct menu_item *items, int *selected)
 486 {
 487         enum input_status status = INPUT_OK;
 488         struct key key;
 489         int size = 0;
 490
 491         while (items[size].text)
 492                 size++;
 493
 494         assert(size > 0);
 495
 496         while (status == INPUT_OK) {
 497                 const struct menu_item *item = &items[*selected];
 498                 char hotkey[] = { '[', (char) item->hotkey, ']', ' ', 0 };
 499                 int i;
 500
 501                 update_status("%s (%d of %d) %s%s", prompt, *selected + 1, size,
 502                               item->hotkey ? hotkey : "", item->text);
 503
 504                 switch (get_input(COLS - 1, &key)) {
 505                 case KEY_RETURN:
 506                 case KEY_ENTER:
 507                 case '\n':
 508                         status = INPUT_STOP;
 509                         break;
 510
 511                 case KEY_LEFT:
 512                 case KEY_UP:
 513                         *selected = *selected - 1;
 514                         if (*selected < 0)
 515                                 *selected = size - 1;
 516                         break;
 517
 518                 case KEY_RIGHT:
 519                 case KEY_DOWN:
 520                         *selected = (*selected + 1) % size;
 521                         break;
 522
 523                 case KEY_ESC:
 524                         status = INPUT_CANCEL;
 525                         break;
 526
 527                 default:
 528                         for (i = 0; items[i].text; i++)
 529                                 if (items[i].hotkey == key.data.bytes[0]) {
 530                                         *selected = i;
 531                                         status = INPUT_STOP;
 532                                         break;
 533                                 }
 534                 }
 535         }
 536
 537         report_clear();
 538
 539         return status != INPUT_CANCEL;
 540 }
 541
 542 static struct option_info option_toggles[] = {
 543 #define DEFINE_OPTION_TOGGLES(name, type, flags) { #name, STRING_SIZE(#name), #type, &opt_ ## name, flags },
 544         OPTION_INFO(DEFINE_OPTION_TOGGLES)
 545 };
 546
 547 static bool
 548 find_arg(const char *argv[], const char *arg)
 549 {
 550         int i;
 551
 552         for (i = 0; argv && argv[i]; i++)
 553                 if (!strcmp(argv[i], arg))
 554                         return TRUE;
 555         return FALSE;
 556 }
 557
 558 static enum status_code
 559 prompt_toggle_option(struct view *view, const char *argv[], const char *prefix,
 560                      struct option_info *toggle, enum view_flag *flags)
 561 {
 562         char name[SIZEOF_STR];
 563
 564         if (!enum_name_prefixed(name, sizeof(name), prefix, toggle->name))
 565                 return error("Failed to toggle option %s", toggle->name);
 566
 567         *flags = toggle->flags;
 568
 569         if (!strcmp(toggle->type, "bool")) {
 570                 bool *opt = toggle->value;
 571
 572                 *opt = !*opt;
 573                 if (opt == &opt_mouse)
 574                         enable_mouse(*opt);
 575                 return success("set %s = %s", name, *opt ? "yes" : "no");
 576
 577         } else if (!strncmp(toggle->type, "enum", 4)) {
 578                 const char *type = toggle->type + STRING_SIZE("enum ");
 579                 enum author *opt = toggle->value;
 580                 const struct enum_map *map = find_enum_map(type);
 581
 582                 *opt = (*opt + 1) % map->size;
 583                 return success("set %s = %s", name, enum_name(map->entries[*opt].name));
 584
 585         } else if (!strcmp(toggle->type, "int")) {
 586                 const char *arg = argv[2] ? argv[2] : "1";
 587                 int diff = atoi(arg);
 588                 int *opt = toggle->value;
 589
 590                 if (!diff)
 591                         diff = *arg == '-' ? -1 : 1;
 592
 593                 if (opt == &opt_diff_context && *opt < 0)
 594                         *opt = -*opt;
 595                 if (opt == &opt_diff_context && diff < 0) {
 596                         if (!*opt)
 597                                 return error("Diff context cannot be less than zero");
 598                         if (*opt < -diff)
 599                                 diff = -*opt;
 600                 }
 601
 602                 if (strstr(name, "commit-title-overflow")) {
 603                         *opt = *opt ? -*opt : 50;
 604                         if (*opt < 0)
 605                                 return success("set %s = no", name);
 606                         diff = 0;
 607                 }
 608
 609                 *opt += diff;
 610                 return success("set %s = %d", name, *opt);
 611
 612         } else if (!strcmp(toggle->type, "double")) {
 613                 const char *arg = argv[2] ? argv[2] : "1.0";
 614                 double *opt = toggle->value;
 615                 int sign = 1;
 616                 double diff;
 617
 618                 if (*arg == '-') {
 619                         sign = -1;
 620                         arg++;
 621                 }
 622
 623                 if (parse_step(&diff, arg) != SUCCESS)
 624                         diff = strtod(arg, NULL);
 625
 626                 *opt += sign * diff;
 627                 return success("set %s = %.2f", name, *opt);
 628
 629         } else if (!strcmp(toggle->type, "const char **")) {
 630                 const char ***opt = toggle->value;
 631                 bool found = TRUE;
 632                 int i;
 633
 634                 if (argv_size(argv) <= 2) {
 635                         argv_free(*opt);
 636                         (*opt)[0] = NULL;
 637                         return SUCCESS;
 638                 }
 639
 640                 for (i = 2; argv[i]; i++) {
 641                         if (!find_arg(*opt, argv[i])) {
 642                                 found = FALSE;
 643                                 break;
 644                         }
 645                 }
 646
 647                 if (found) {
 648                         int next, pos;
 649
 650                         for (next = 0, pos = 0; (*opt)[pos]; pos++) {
 651                                 const char *arg = (*opt)[pos];
 652
 653                                 if (find_arg(argv + 2, arg)) {
 654                                         free((void *) arg);
 655                                         continue;
 656                                 }
 657                                 (*opt)[next++] = arg;
 658                         }
 659
 660                         (*opt)[next] = NULL;
 661
 662                 } else if (!argv_copy(opt, argv + 2)) {
 663                         return ERROR_OUT_OF_MEMORY;
 664                 }
 665                 return SUCCESS;
 666
 667         } else {
 668                 return error("Unsupported `:toggle %s` (%s)", name, toggle->type);
 669         }
 670 }
 671
 672 static enum status_code
 673 prompt_toggle(struct view *view, const char *argv[], enum view_flag *flags)
 674 {
 675         const char *option = argv[1];
 676         size_t optionlen = option ? strlen(option) : 0;
 677         struct option_info template;
 678         struct option_info *toggle;
 679         struct view_column *column;
 680         const char *column_name;
 681
 682         if (!option)
 683                 return error("%s", "No option name given to :toggle");
 684
 685         if (enum_equals_static("sort-field", option, optionlen) ||
 686             enum_equals_static("sort-order", option, optionlen)) {
 687                 if (!view_has_flags(view, VIEW_SORTABLE)) {
 688                         return error("Sorting is not yet supported for the %s view", view->name);
 689                 } else {
 690                         bool sort_field = enum_equals_static("sort-field", option, optionlen);
 691                         struct sort_state *sort = &view->sort;
 692
 693                         sort_view(view, sort_field);
 694                         return success("set %s = %s", option,
 695                                 sort_field ? view_column_name(get_sort_field(view))
 696                                            : sort->reverse ? "descending" : "ascending");
 697                 }
 698         }
 699
 700         toggle = find_option_info(option_toggles, ARRAY_SIZE(option_toggles), "", option);
 701         if (toggle)
 702                 return prompt_toggle_option(view, argv, "", toggle, flags);
 703
 704         for (column = view->columns; column; column = column->next) {
 705                 toggle = find_column_option_info(column->type, &column->opt, option, &template, &column_name);
 706                 if (toggle)
 707                         return prompt_toggle_option(view, argv, column_name, toggle, flags);
 708         }
 709
 710         return error("`:toggle %s` not supported", option);
 711 }
 712
 713 static void
 714 prompt_update_display(enum view_flag flags)
 715 {
 716         struct view *view;
 717         int i;
 718
 719         if (flags & VIEW_RESET_DISPLAY) {
 720                 resize_display();
 721                 redraw_display(TRUE);
 722         }
 723
 724         foreach_displayed_view(view, i) {
 725                 if (view_has_flags(view, flags) && view_can_refresh(view))
 726                         reload_view(view);
 727                 else
 728                         redraw_view(view);
 729         }
 730 }
 731
 732 enum request
 733 run_prompt_command(struct view *view, const char *argv[])
 734 {
 735         enum request request;
 736         const char *cmd = argv[0];
 737         size_t cmdlen = cmd ? strlen(cmd) : 0;
 738
 739         if (!cmd)
 740                 return REQ_NONE;
 741
 742         if (string_isnumber(cmd)) {
 743                 int lineno = view->pos.lineno + 1;
 744
 745                 if (parse_int(&lineno, cmd, 0, view->lines + 1) == SUCCESS) {
 746                         if (!lineno)
 747                                 lineno = 1;
 748                         select_view_line(view, lineno - 1);
 749                         report_clear();
 750                 } else {
 751                         report("Unable to parse '%s' as a line number", cmd);
 752                 }
 753         } else if (iscommit(cmd)) {
 754                 int lineno;
 755
 756                 if (!(view->ops->column_bits & view_column_bit(ID))) {
 757                         report("Jumping to commits is not supported by the %s view", view->name);
 758                         return REQ_NONE;
 759                 }
 760
 761                 for (lineno = 0; lineno < view->lines; lineno++) {
 762                         struct view_column_data column_data = {0};
 763                         struct line *line = &view->line[lineno];
 764
 765                         if (view->ops->get_column_data(view, line, &column_data) &&
 766                             column_data.id &&
 767                             !strncasecmp(column_data.id, cmd, cmdlen)) {
 768                                 string_ncopy(view->env->search, cmd, cmdlen);
 769                                 select_view_line(view, lineno);
 770                                 report_clear();
 771                                 return REQ_NONE;
 772                         }
 773                 }
 774
 775                 report("Unable to find commit '%s'", view->env->search);
 776                 return REQ_NONE;
 777
 778         } else if (cmdlen > 1 && (cmd[0] == '/' || cmd[0] == '?')) {
 779                 char search[SIZEOF_STR];
 780
 781                 if (!argv_to_string(argv, search, sizeof(search), " ")) {
 782                         report("Failed to copy search string");
 783                         return REQ_NONE;
 784                 }
 785
 786                 if (!strcmp(search + 1, view->env->search))
 787                         return cmd[0] == '/' ? REQ_FIND_NEXT : REQ_FIND_PREV;
 788
 789                 string_ncopy(view->env->search, search + 1, strlen(search + 1));
 790                 return cmd[0] == '/' ? REQ_SEARCH : REQ_SEARCH_BACK;
 791
 792         } else if (cmdlen > 1 && cmd[0] == '!') {
 793                 struct view *next = &pager_view;
 794                 bool copied;
 795
 796                 /* Trim the leading '!'. */
 797                 argv[0] = cmd + 1;
 798                 copied = argv_format(view->env, &next->argv, argv, FALSE, TRUE);
 799                 argv[0] = cmd;
 800
 801                 if (!copied) {
 802                         report("Argument formatting failed");
 803                 } else {
 804                         /* When running random commands, initially show the
 805                          * command in the title. However, it maybe later be
 806                          * overwritten if a commit line is selected. */
 807                         argv_to_string(next->argv, next->ref, sizeof(next->ref), " ");
 808
 809                         next->dir = NULL;
 810                         open_pager_view(view, OPEN_PREPARED | OPEN_WITH_STDERR);
 811                 }
 812
 813         } else if (!strcmp(cmd, "save-display")) {
 814                 const char *path = argv[1] ? argv[1] : "tig-display.txt";
 815
 816                 if (!save_display(path))
 817                         report("Failed to save screen to %s", path);
 818                 else
 819                         report("Saved screen to %s", path);
 820
 821         } else if (!strcmp(cmd, "save-options")) {
 822                 const char *path = argv[1] ? argv[1] : "tig-options.txt";
 823                 enum status_code code = save_options(path);
 824
 825                 if (code != SUCCESS)
 826                         report("Failed to save options: %s", get_status_message(code));
 827                 else
 828                         report("Saved options to %s", path);
 829
 830         } else if (!strcmp(cmd, "exec")) {
 831                 struct run_request req = { view->keymap, {0}, argv + 1 };
 832                 enum status_code code = parse_run_request_flags(&req.flags, argv + 1);
 833
 834                 if (code != SUCCESS) {
 835                         report("Failed to execute command: %s", get_status_message(code));
 836                 } else {
 837                         return exec_run_request(view, &req);
 838                 }
 839
 840         } else if (!strcmp(cmd, "toggle")) {
 841                 enum view_flag flags = VIEW_NO_FLAGS;
 842                 enum status_code code = prompt_toggle(view, argv, &flags);
 843                 const char *action = get_status_message(code);
 844
 845                 if (code != SUCCESS) {
 846                         report("%s", action);
 847                         return REQ_NONE;
 848                 }
 849
 850                 prompt_update_display(flags);
 851
 852                 if (*action)
 853                         report("%s", action);
 854
 855         } else if (!strcmp(cmd, "script")) {
 856                 enum status_code code = open_script(argv[1]);
 857
 858                 if (code != SUCCESS)
 859                         report("%s", get_status_message(code));
 860                 return REQ_NONE;
 861
 862         } else {
 863                 struct key key = {{0}};
 864                 enum status_code code;
 865                 enum view_flag flags = VIEW_NO_FLAGS;
 866
 867                 /* Try :<key> */
 868                 key.modifiers.multibytes = 1;
 869                 string_ncopy(key.data.bytes, cmd, cmdlen);
 870                 request = get_keybinding(view->keymap, &key, 1, NULL);
 871                 if (request != REQ_UNKNOWN)
 872                         return request;
 873
 874                 /* Try :<command> */
 875                 request = get_request(cmd);
 876                 if (request != REQ_UNKNOWN)
 877                         return request;
 878
 879                 code = set_option(argv[0], argv_size(argv + 1), &argv[1]);
 880                 if (code != SUCCESS) {
 881                         report("%s", get_status_message(code));
 882                         return REQ_NONE;
 883                 }
 884
 885                 if (!strcmp(cmd, "set")) {
 886                         struct option_info *toggle;
 887
 888                         toggle = find_option_info(option_toggles, ARRAY_SIZE(option_toggles),
 889                                                   "", argv[1]);
 890
 891                         if (toggle)
 892                                 flags = toggle->flags;
 893                 }
 894
 895                 if (flags) {
 896                         prompt_update_display(flags);
 897
 898                 } else {
 899                         request = view_can_refresh(view) ? REQ_REFRESH : REQ_SCREEN_REDRAW;
 900                         if (!strcmp(cmd, "color"))
 901                                 init_colors();
 902                         resize_display();
 903                         redraw_display(TRUE);
 904                 }
 905
 906         }
 907         return REQ_NONE;
 908 }
 909
 910 enum request
 911 exec_run_request(struct view *view, struct run_request *req)
 912 {
 913         const char **argv = NULL;
 914         bool confirmed = FALSE;
 915         enum request request = REQ_NONE;
 916         char cmd[SIZEOF_STR];
 917         const char *req_argv[SIZEOF_ARG];
 918         int req_argc = 0;
 919
 920         if (!argv_to_string(req->argv, cmd, sizeof(cmd), " ")
 921             || !argv_from_string_no_quotes(req_argv, &req_argc, cmd)
 922             || !argv_format(view->env, &argv, req_argv, FALSE, TRUE)) {
 923                 report("Failed to format arguments");
 924                 return REQ_NONE;
 925         }
 926
 927         if (req->flags.internal) {
 928                 request = run_prompt_command(view, argv);
 929
 930         } else {
 931                 confirmed = !req->flags.confirm;
 932
 933                 if (req->flags.confirm) {
 934                         char cmd[SIZEOF_STR], prompt[SIZEOF_STR];
 935                         const char *and_exit = req->flags.exit ? " and exit" : "";
 936
 937                         if (argv_to_string_quoted(argv, cmd, sizeof(cmd), " ") &&
 938                             string_format(prompt, "Run `%s`%s?", cmd, and_exit) &&
 939                             prompt_yesno(prompt)) {
 940                                 confirmed = TRUE;
 941                         }
 942                 }
 943
 944                 if (confirmed)
 945                         open_external_viewer(argv, NULL, req->flags.silent,
 946                                              !req->flags.exit, FALSE, "");
 947         }
 948
 949         if (argv)
 950                 argv_free(argv);
 951         free(argv);
 952
 953         if (request == REQ_NONE) {
 954                 if (req->flags.confirm && !confirmed)
 955                         request = REQ_NONE;
 956
 957                 else if (req->flags.exit)
 958                         request = REQ_QUIT;
 959
 960                 else if (!req->flags.internal && watch_dirty(&view->watch))
 961                         request = REQ_REFRESH;
 962
 963         }
 964
 965         return request;
 966 }
 967
 968 enum request
 969 open_prompt(struct view *view)
 970 {
 971         char *cmd = read_prompt(":");
 972         const char *argv[SIZEOF_ARG] = { NULL };
 973         int argc = 0;
 974
 975         if (cmd && !argv_from_string(argv, &argc, cmd)) {
 976                 report("Too many arguments");
 977                 return REQ_NONE;
 978         }
 979
 980         return run_prompt_command(view, argv);
 981 }
 982
 983 /* vim: set ts=8 sw=8 noexpandtab: */