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