src/draw.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/graph.h"
  16 #include "tig/draw.h"
  17 #include "tig/options.h"
  18
  19 /*
  20  * View drawing.
  21  */
  22
  23 static inline void
  24 set_view_attr(struct view *view, enum line_type type)
  25 {
  26         if (!view->curline->selected && view->curtype != type) {
  27                 (void) wattrset(view->win, get_view_attr(view, type));
  28                 wchgat(view->win, -1, 0, get_view_color(view, type), NULL);
  29                 view->curtype = type;
  30         }
  31 }
  32
  33 #define VIEW_MAX_LEN(view) ((view)->width + (view)->pos.col - (view)->col)
  34
  35 static bool
  36 draw_chars(struct view *view, enum line_type type, const char *string,
  37            int max_len, bool use_tilde)
  38 {
  39         int len = 0;
  40         int col = 0;
  41         int trimmed = FALSE;
  42         size_t skip = view->pos.col > view->col ? view->pos.col - view->col : 0;
  43
  44         if (max_len <= 0)
  45                 return VIEW_MAX_LEN(view) <= 0;
  46
  47         len = utf8_length(&string, skip, &col, max_len, &trimmed, use_tilde, opt_tab_size);
  48
  49         if (opt_iconv_out != ICONV_NONE) {
  50                 string = encoding_iconv(opt_iconv_out, string, len);
  51                 if (!string)
  52                         return VIEW_MAX_LEN(view) <= 0;
  53         }
  54
  55         set_view_attr(view, type);
  56         if (len > 0) {
  57                 waddnstr(view->win, string, len);
  58
  59                 if (trimmed && use_tilde) {
  60                         set_view_attr(view, LINE_DELIMITER);
  61                         waddch(view->win, '~');
  62                         col++;
  63                 }
  64         }
  65
  66         view->col += col;
  67         return VIEW_MAX_LEN(view) <= 0;
  68 }
  69
  70 static bool
  71 draw_space(struct view *view, enum line_type type, int max, int spaces)
  72 {
  73         static char space[] = "                    ";
  74
  75         spaces = MIN(max, spaces);
  76
  77         while (spaces > 0) {
  78                 int len = MIN(spaces, sizeof(space) - 1);
  79
  80                 if (draw_chars(view, type, space, len, FALSE))
  81                         return TRUE;
  82                 spaces -= len;
  83         }
  84
  85         return VIEW_MAX_LEN(view) <= 0;
  86 }
  87
  88 static bool
  89 draw_text_expanded(struct view *view, enum line_type type, const char *string, int max_len, bool use_tilde)
  90 {
  91         static char text[SIZEOF_STR];
  92
  93         do {
  94                 size_t pos = string_expand(text, sizeof(text), string, opt_tab_size);
  95
  96                 if (draw_chars(view, type, text, max_len, use_tilde))
  97                         return TRUE;
  98                 string += pos;
  99         } while (*string);
 100
 101         return VIEW_MAX_LEN(view) <= 0;
 102 }
 103
 104 bool
 105 draw_text(struct view *view, enum line_type type, const char *string)
 106 {
 107         return draw_text_expanded(view, type, string, VIEW_MAX_LEN(view), TRUE);
 108 }
 109
 110 static bool
 111 draw_text_overflow(struct view *view, const char *text, enum line_type type,
 112                    int overflow_length, int offset)
 113 {
 114         bool on = overflow_length > 0;
 115
 116         if (on) {
 117                 int overflow = overflow_length + offset;
 118                 int max = MIN(VIEW_MAX_LEN(view), overflow);
 119                 int len = strlen(text);
 120
 121                 if (draw_text_expanded(view, type, text, max, max < overflow))
 122                         return TRUE;
 123
 124                 text = len > overflow ? text + overflow : "";
 125                 type = LINE_OVERFLOW;
 126         }
 127
 128         if (*text && draw_text(view, type, text))
 129                 return TRUE;
 130
 131         return VIEW_MAX_LEN(view) <= 0;
 132 }
 133
 134 bool PRINTF_LIKE(3, 4)
 135 draw_formatted(struct view *view, enum line_type type, const char *format, ...)
 136 {
 137         char text[SIZEOF_STR];
 138         int retval;
 139
 140         FORMAT_BUFFER(text, sizeof(text), format, retval, TRUE);
 141         return retval >= 0 ? draw_text(view, type, text) : VIEW_MAX_LEN(view) <= 0;
 142 }
 143
 144 bool
 145 draw_graphic(struct view *view, enum line_type type, const chtype graphic[], size_t size, bool separator)
 146 {
 147         size_t skip = view->pos.col > view->col ? view->pos.col - view->col : 0;
 148         int max = VIEW_MAX_LEN(view);
 149         int i;
 150
 151         if (max < size)
 152                 size = max;
 153
 154         set_view_attr(view, type);
 155         /* Using waddch() instead of waddnstr() ensures that
 156          * they'll be rendered correctly for the cursor line. */
 157         for (i = skip; i < size; i++)
 158                 waddch(view->win, graphic[i]);
 159
 160         view->col += size;
 161         if (separator) {
 162                 if (size < max && skip <= size)
 163                         waddch(view->win, ' ');
 164                 view->col++;
 165         }
 166
 167         return VIEW_MAX_LEN(view) <= 0;
 168 }
 169
 170 bool
 171 draw_field(struct view *view, enum line_type type, const char *text, int width, enum align align, bool trim)
 172 {
 173         int max = MIN(VIEW_MAX_LEN(view), width + 1);
 174         int col = view->col;
 175
 176         if (!text)
 177                 return draw_space(view, type, max, max);
 178
 179         if (align == ALIGN_RIGHT) {
 180                 int textlen = utf8_width_max(text, max);
 181                 int leftpad = max - textlen - 1;
 182
 183                 if (leftpad > 0) {
 184                         if (draw_space(view, type, leftpad, leftpad))
 185                                 return TRUE;
 186                         max -= leftpad;
 187                         col += leftpad;;
 188                 }
 189         }
 190
 191         return draw_chars(view, type, text, max - 1, trim)
 192             || draw_space(view, LINE_DEFAULT, max - (view->col - col), max);
 193 }
 194
 195 static bool
 196 draw_date(struct view *view, struct view_column *column, const struct time *time)
 197 {
 198         enum date date = column->opt.date.show;
 199         const char *text = mkdate(time, date);
 200         enum align align = date == DATE_RELATIVE ? ALIGN_RIGHT : ALIGN_LEFT;
 201
 202         if (date == DATE_NO)
 203                 return FALSE;
 204
 205         return draw_field(view, LINE_DATE, text, column->width, align, FALSE);
 206 }
 207
 208 static bool
 209 draw_author(struct view *view, struct view_column *column, const struct ident *author)
 210 {
 211         bool trim = author_trim(column->width);
 212         const char *text = mkauthor(author, column->width, column->opt.author.show);
 213
 214         if (column->opt.author.show == AUTHOR_NO)
 215                 return FALSE;
 216
 217         return draw_field(view, LINE_AUTHOR, text, column->width, ALIGN_LEFT, trim);
 218 }
 219
 220 static bool
 221 draw_id(struct view *view, struct view_column *column, const char *id)
 222 {
 223         static const enum line_type colors[] = {
 224                 LINE_PALETTE_0,
 225                 LINE_PALETTE_1,
 226                 LINE_PALETTE_2,
 227                 LINE_PALETTE_3,
 228                 LINE_PALETTE_4,
 229                 LINE_PALETTE_5,
 230                 LINE_PALETTE_6,
 231         };
 232         enum line_type type = LINE_ID;
 233
 234         if (!column->opt.id.show)
 235                 return FALSE;
 236
 237         if (column->opt.id.color)
 238                 type = colors[((long) id) % ARRAY_SIZE(colors)];
 239
 240         return draw_field(view, type, id, column->width, ALIGN_LEFT, FALSE);
 241 }
 242
 243 static bool
 244 draw_filename(struct view *view, struct view_column *column, const char *filename, mode_t mode)
 245 {
 246         size_t width = filename ? utf8_width(filename) : 0;
 247         bool trim = width >= column->width;
 248         enum line_type type = S_ISDIR(mode) ? LINE_DIRECTORY : LINE_FILE;
 249         int column_width = column->width ? column->width : width;
 250
 251         if (column->opt.file_name.show == FILENAME_NO)
 252                 return FALSE;
 253
 254         return draw_field(view, type, filename, column_width, ALIGN_LEFT, trim);
 255 }
 256
 257 static bool
 258 draw_file_size(struct view *view, struct view_column *column, unsigned long size, mode_t mode)
 259 {
 260         const char *str = S_ISDIR(mode) ? NULL : mkfilesize(size, column->opt.file_size.show);
 261
 262         if (!column->width || column->opt.file_size.show == FILE_SIZE_NO)
 263                 return FALSE;
 264
 265         return draw_field(view, LINE_FILE_SIZE, str, column->width, ALIGN_RIGHT, FALSE);
 266 }
 267
 268 static bool
 269 draw_mode(struct view *view, struct view_column *column, mode_t mode)
 270 {
 271         const char *str = mkmode(mode);
 272
 273         if (!column->width || !column->opt.mode.show)
 274                 return FALSE;
 275
 276         return draw_field(view, LINE_MODE, str, column->width, ALIGN_LEFT, FALSE);
 277 }
 278
 279 static bool
 280 draw_lineno_custom(struct view *view, struct view_column *column, unsigned int lineno)
 281 {
 282         char number[10];
 283         unsigned long digits3 = column->width < 3 ? 3 : column->width;
 284         int max = MIN(VIEW_MAX_LEN(view), digits3);
 285         char *text = NULL;
 286         chtype separator = opt_line_graphics ? ACS_VLINE : '|';
 287
 288         if (!column->opt.line_number.show)
 289                 return FALSE;
 290
 291         if (lineno == 1 || (lineno % column->opt.line_number.interval) == 0) {
 292                 static char fmt[] = "%ld";
 293
 294                 fmt[1] = '0' + (digits3 <= 9 ? digits3 : 1);
 295                 if (string_format(number, fmt, lineno))
 296                         text = number;
 297         }
 298         if (text)
 299                 draw_chars(view, LINE_LINE_NUMBER, text, max, TRUE);
 300         else
 301                 draw_space(view, LINE_LINE_NUMBER, max, digits3);
 302         return draw_graphic(view, LINE_DEFAULT, &separator, 1, TRUE);
 303 }
 304
 305 bool
 306 draw_lineno(struct view *view, struct view_column *column, unsigned int lineno)
 307 {
 308         lineno += view->pos.offset + 1;
 309         return draw_lineno_custom(view, column, lineno);
 310 }
 311
 312 static bool
 313 draw_ref(struct view *view, struct view_column *column, const struct ref *ref)
 314 {
 315         enum line_type type = !ref || !ref->valid ? LINE_DEFAULT : get_line_type_from_ref(ref);
 316         const char *name = ref ? ref->name : NULL;
 317
 318         return draw_field(view, type, name, column->width, ALIGN_LEFT, FALSE);
 319 }
 320
 321 static bool
 322 draw_refs(struct view *view, struct view_column *column, const struct ref_list *refs)
 323 {
 324         size_t i;
 325
 326         if (!column->opt.commit_title.refs || !refs)
 327                 return FALSE;
 328
 329         for (i = 0; i < refs->size; i++) {
 330                 struct ref *ref = refs->refs[i];
 331                 enum line_type type = get_line_type_from_ref(ref);
 332                 const struct ref_format *format = get_ref_format(ref);
 333
 334                 if (!strcmp(format->start, "hide:") && !*format->end)
 335                         continue;
 336
 337                 if (draw_formatted(view, type, "%s%s%s", format->start, ref->name, format->end))
 338                         return TRUE;
 339
 340                 if (draw_text(view, LINE_DEFAULT, " "))
 341                         return TRUE;
 342         }
 343
 344         return FALSE;
 345 }
 346
 347 static bool
 348 draw_status(struct view *view, struct view_column *column,
 349             enum line_type type, const char *status)
 350 {
 351         char label[] = { status ? *status : 0, 0 };
 352
 353         return draw_field(view, type, label, column->width, ALIGN_LEFT, FALSE);
 354 }
 355
 356 /*
 357  * Revision graph
 358  */
 359
 360 static const enum line_type graph_colors[] = {
 361         LINE_PALETTE_0,
 362         LINE_PALETTE_1,
 363         LINE_PALETTE_2,
 364         LINE_PALETTE_3,
 365         LINE_PALETTE_4,
 366         LINE_PALETTE_5,
 367         LINE_PALETTE_6,
 368 };
 369
 370 static enum line_type get_graph_color(struct graph_symbol *symbol)
 371 {
 372         if (symbol->commit)
 373                 return LINE_GRAPH_COMMIT;
 374         assert(symbol->color < ARRAY_SIZE(graph_colors));
 375         return graph_colors[symbol->color];
 376 }
 377
 378 static bool
 379 draw_graph_utf8(struct view *view, struct graph_symbol *symbol, enum line_type color, bool first)
 380 {
 381         const char *chars = graph_symbol_to_utf8(symbol);
 382
 383         return draw_text(view, color, chars + !!first);
 384 }
 385
 386 static bool
 387 draw_graph_ascii(struct view *view, struct graph_symbol *symbol, enum line_type color, bool first)
 388 {
 389         const char *chars = graph_symbol_to_ascii(symbol);
 390
 391         return draw_text(view, color, chars + !!first);
 392 }
 393
 394 static bool
 395 draw_graph_chtype(struct view *view, struct graph_symbol *symbol, enum line_type color, bool first)
 396 {
 397         const chtype *chars = graph_symbol_to_chtype(symbol);
 398
 399         return draw_graphic(view, color, chars + !!first, 2 - !!first, FALSE);
 400 }
 401
 402 typedef bool (*draw_graph_fn)(struct view *, struct graph_symbol *, enum line_type, bool);
 403
 404 static bool
 405 draw_graph(struct view *view, const struct graph_canvas *canvas)
 406 {
 407         static const draw_graph_fn fns[] = {
 408                 draw_graph_ascii,
 409                 draw_graph_chtype,
 410                 draw_graph_utf8
 411         };
 412         draw_graph_fn fn = fns[opt_line_graphics];
 413         int i;
 414
 415         for (i = 0; i < canvas->size; i++) {
 416                 struct graph_symbol *symbol = &canvas->symbols[i];
 417                 enum line_type color = get_graph_color(symbol);
 418
 419                 if (fn(view, symbol, color, i == 0))
 420                         return TRUE;
 421         }
 422
 423         return draw_text(view, LINE_DEFAULT, " ");
 424 }
 425
 426 static bool
 427 draw_commit_title(struct view *view, struct view_column *column,
 428                   const struct graph_canvas *graph, const struct ref_list *refs,
 429                   const char *commit_title)
 430 {
 431         if (graph && column->opt.commit_title.graph &&
 432             draw_graph(view, graph))
 433                 return TRUE;
 434         if (draw_refs(view, column, refs))
 435                 return TRUE;
 436         return draw_text_overflow(view, commit_title, LINE_DEFAULT,
 437                         column->opt.commit_title.overflow, 0);
 438 }
 439
 440 static bool
 441 draw_diff_stat_part(struct view *view, enum line_type *type, const char **text, char c, enum line_type next_type)
 442 {
 443         const char *sep = c == '|' ? strrchr(*text, c) : strchr(*text, c);
 444
 445         if (sep != NULL) {
 446                 draw_text_expanded(view, *type, *text, sep - *text, FALSE);
 447                 *text = sep;
 448                 *type = next_type;
 449         }
 450
 451         return sep != NULL;
 452 }
 453
 454 static void
 455 draw_diff_stat(struct view *view, enum line_type *type, const char **text)
 456 {
 457         draw_diff_stat_part(view, type, text, '|', LINE_DEFAULT);
 458         if (draw_diff_stat_part(view, type, text, 'B', LINE_DEFAULT)) {
 459                 /* Handle binary diffstat: Bin <deleted> -> <added> bytes */
 460                 draw_diff_stat_part(view, type, text, ' ', LINE_DIFF_DEL);
 461                 draw_diff_stat_part(view, type, text, '-', LINE_DEFAULT);
 462                 draw_diff_stat_part(view, type, text, ' ', LINE_DIFF_ADD);
 463                 draw_diff_stat_part(view, type, text, 'b', LINE_DEFAULT);
 464
 465         } else {
 466                 draw_diff_stat_part(view, type, text, '+', LINE_DIFF_ADD);
 467                 draw_diff_stat_part(view, type, text, '-', LINE_DIFF_DEL);
 468         }
 469 }
 470
 471 bool
 472 view_column_draw(struct view *view, struct line *line, unsigned int lineno)
 473 {
 474         struct view_column *column = view->columns;
 475         struct view_column_data column_data = {};
 476
 477         if (!view->ops->get_column_data(view, line, &column_data))
 478                 return TRUE;
 479
 480         if (column_data.section)
 481                 column = column_data.section;
 482
 483         for (; column; column = column->next) {
 484                 mode_t mode = column_data.mode ? *column_data.mode : 0;
 485
 486                 if (column->hidden)
 487                         continue;
 488
 489                 switch (column->type) {
 490                 case VIEW_COLUMN_DATE:
 491                         if (draw_date(view, column, column_data.date))
 492                                 return TRUE;
 493                         continue;
 494
 495                 case VIEW_COLUMN_AUTHOR:
 496                         if (draw_author(view, column, column_data.author))
 497                                 return TRUE;
 498                         continue;
 499
 500                 case VIEW_COLUMN_REF:
 501                         if (draw_ref(view, column, column_data.ref))
 502                                 return TRUE;
 503                         continue;
 504
 505                 case VIEW_COLUMN_ID:
 506                         if (draw_id(view, column, column_data.id))
 507                                 return TRUE;
 508                         continue;
 509
 510                 case VIEW_COLUMN_LINE_NUMBER:
 511                         if (draw_lineno(view, column, column_data.line_number ? *column_data.line_number : lineno))
 512                                 return TRUE;
 513                         continue;
 514
 515                 case VIEW_COLUMN_MODE:
 516                         if (draw_mode(view, column, mode))
 517                                 return TRUE;
 518                         continue;
 519
 520                 case VIEW_COLUMN_FILE_SIZE:
 521                         if (draw_file_size(view, column, column_data.file_size ? *column_data.file_size : 0, mode))
 522                                 return TRUE;
 523                         continue;
 524
 525                 case VIEW_COLUMN_COMMIT_TITLE:
 526                         if (draw_commit_title(view, column, column_data.graph,
 527                                               column_data.refs, column_data.commit_title))
 528                                 return TRUE;
 529                         continue;
 530
 531                 case VIEW_COLUMN_FILE_NAME:
 532                         if (draw_filename(view, column, column_data.file_name, mode))
 533                                 return TRUE;
 534                         continue;
 535
 536                 case VIEW_COLUMN_SECTION:
 537                         if (draw_text(view, column->opt.section.type, column->opt.section.text))
 538                                 return TRUE;
 539                         continue;
 540
 541                 case VIEW_COLUMN_STATUS:
 542                         if (draw_status(view, column, line->type, column_data.status))
 543                                 return TRUE;
 544                         continue;
 545
 546                 case VIEW_COLUMN_TEXT:
 547                 {
 548                         enum line_type type = line->type;
 549                         const char *text = column_data.text;
 550
 551                         if (line->wrapped && draw_text(view, LINE_DELIMITER, "+"))
 552                                 return TRUE;
 553
 554                         if (line->graph_indent) {
 555                                 size_t indent = get_graph_indent(text);
 556
 557                                 if (draw_text_expanded(view, LINE_DEFAULT, text, indent, FALSE))
 558                                         return TRUE;
 559                                 text += indent;
 560                         }
 561                         if (type == LINE_DIFF_STAT)
 562                                 draw_diff_stat(view, &type, &text);
 563                         if (line->commit_title) {
 564                                 if (draw_text_overflow(view, text, LINE_DEFAULT,
 565                                                        column->opt.text.commit_title_overflow, 4))
 566                                         return TRUE;
 567                         } else if (draw_text(view, type, text)) {
 568                                 return TRUE;
 569                         }
 570                 }
 571                         continue;
 572                 }
 573         }
 574
 575         return TRUE;
 576 }
 577
 578 bool
 579 draw_view_line(struct view *view, unsigned int lineno)
 580 {
 581         struct line *line;
 582         bool selected = (view->pos.offset + lineno == view->pos.lineno);
 583
 584         /* FIXME: Disabled during code split.
 585         assert(view_is_displayed(view));
 586         */
 587
 588         if (view->pos.offset + lineno >= view->lines)
 589                 return FALSE;
 590
 591         line = &view->line[view->pos.offset + lineno];
 592
 593         wmove(view->win, lineno, 0);
 594         if (line->cleareol)
 595                 wclrtoeol(view->win);
 596         view->col = 0;
 597         view->curline = line;
 598         view->curtype = LINE_NONE;
 599         line->selected = FALSE;
 600         line->dirty = line->cleareol = 0;
 601
 602         if (selected) {
 603                 set_view_attr(view, LINE_CURSOR);
 604                 line->selected = TRUE;
 605                 view->ops->select(view, line);
 606         }
 607
 608         return view->ops->draw(view, line, lineno);
 609 }
 610
 611 void
 612 redraw_view_dirty(struct view *view)
 613 {
 614         bool dirty = FALSE;
 615         int lineno;
 616
 617         for (lineno = 0; lineno < view->height; lineno++) {
 618                 if (view->pos.offset + lineno >= view->lines)
 619                         break;
 620                 if (!view->line[view->pos.offset + lineno].dirty)
 621                         continue;
 622                 dirty = TRUE;
 623                 if (!draw_view_line(view, lineno))
 624                         break;
 625         }
 626
 627         if (!dirty)
 628                 return;
 629         wnoutrefresh(view->win);
 630 }
 631
 632 void
 633 redraw_view_from(struct view *view, int lineno)
 634 {
 635         assert(0 <= lineno && lineno < view->height);
 636
 637         if (view->columns && view_column_info_changed(view, FALSE)) {
 638                 int i;
 639
 640                 view_column_reset(view);
 641                 for (i = 0; i < view->lines; i++) {
 642                         view_column_info_update(view, &view->line[i]);
 643                 }
 644         }
 645
 646         for (; lineno < view->height; lineno++) {
 647                 if (!draw_view_line(view, lineno))
 648                         break;
 649         }
 650
 651         wnoutrefresh(view->win);
 652 }
 653
 654 void
 655 redraw_view(struct view *view)
 656 {
 657         werase(view->win);
 658         redraw_view_from(view, 0);
 659 }
 660
 661 /* vim: set ts=8 sw=8 noexpandtab: */