2 * Functions necessary to display a deck of slides in different color modes
3 * using ncurses. Only white, red, and blue are supported, as they can be
4 * faded in 256 color mode.
5 * Copyright (C) 2014 Michael Goehler
7 * This file is part of mdp.
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include <ctype.h> // isalnum
25 #include <locale.h> // setlocale
26 #include <string.h> // strchr
27 #include <unistd.h> // usleep
31 // color ramp for fading from black to color
32 static short white_ramp[24] = { 16, 232, 233, 234, 235, 236,
33 237, 238, 239, 240, 241, 242,
34 244, 245, 246, 247, 248, 249,
35 250, 251, 252, 253, 254, 255 };
37 static short blue_ramp[24] = { 16, 17, 17, 18, 18, 19,
38 19, 20, 20, 21, 27, 33,
39 32, 39, 38, 45, 44, 44,
40 81, 81, 51, 51, 123, 123 };
42 static short red_ramp[24] = { 16, 52, 52, 53, 53, 89,
43 89, 90, 90, 126, 127, 127,
44 163, 163, 164, 164, 200, 200,
45 201, 201, 207, 207, 213, 213 };
47 // color ramp for fading from white to color
48 static short white_ramp_invert[24] = { 15, 255, 254, 254, 252, 251,
49 250, 249, 248, 247, 246, 245,
50 243, 242, 241, 240, 239, 238,
51 237, 236, 235, 234, 233, 232};
53 static short blue_ramp_invert[24] = { 15, 231, 231, 195, 195, 159,
54 159, 123, 123, 87, 51, 44,
55 45, 38, 39, 32, 33, 33,
56 26, 26, 27, 27, 21, 21};
58 static short red_ramp_invert[24] = { 15, 231, 231, 224, 224, 225,
59 225, 218, 218, 219, 212, 213,
60 206, 207, 201, 200, 199, 199,
61 198, 198, 197, 197, 196, 196};
63 int ncurses_display(deck_t *deck, int notrans, int nofade, int invert) {
67 int l = 0; // line number
68 int lc = 0; // line count
69 int sc = 1; // slide count
70 int colors = 0; // amount of colors supported
71 int fade = 0; // disable color fading by default
72 int trans = -1; // enable transparency if term supports it
73 int max_lines = 0; // max lines per slide
74 int max_cols = 0; // max columns per line
75 int offset; // text offset
77 // header line 1 is displayed at the top
78 int bar_top = (deck->headers > 0) ? 1 : 0;
79 // header line 2 is displayed at the bottom
80 // anyway we display the slide number at the bottom
83 slide_t *slide = deck->slide;
86 // set locale to display UTF-8 correctly in ncurses
87 setlocale(LC_CTYPE, "");
97 if(line->length > COLS) {
102 i = prev_blank(line->text, offset + COLS) - offset;
104 // single word is > COLS
106 // calculate min_width
107 i = next_blank(line->text, offset + COLS) - offset;
113 fprintf(stderr, "Error: Terminal width (%i columns) too small. Need at least %i columns.\n", COLS, i);
114 fprintf(stderr, "You may need to shorten some lines by inserting line breaks.\n");
120 max_cols = MAX(i, max_cols);
122 // iterate to next line
123 offset = prev_blank(line->text, offset + COLS);
124 i = line->length - offset;
127 // set max_cols one last time
128 max_cols = MAX(i, max_cols);
131 max_cols = MAX(line->length, max_cols);
137 max_lines = MAX(lc, max_lines);
143 if(max_lines + bar_top + bar_bottom > LINES) {
149 fprintf(stderr, "Error: Terminal height (%i lines) too small. Need at least %i lines.\n", LINES, max_lines + bar_top + bar_bottom);
150 fprintf(stderr, "You may need to add additional horizontal rules ('***') to split your file in shorter slides.\n");
158 // disable output of keyboard typing
161 // make getch() process one char at a time
168 if(has_colors() == TRUE) {
170 use_default_colors();
177 trans = 15; // white in 256 color mode
179 trans = 16; // black in 256 color mode
184 init_pair(CP_WHITE, 232, trans);
185 init_pair(CP_BLUE, 21, trans);
186 init_pair(CP_RED, 196, trans);
187 init_pair(CP_BLACK, 15, 232);
189 init_pair(CP_WHITE, 255, trans);
190 init_pair(CP_BLUE, 123, trans);
191 init_pair(CP_RED, 213, trans);
192 init_pair(CP_BLACK, 16, 255);
194 init_pair(CP_YELLOW, 208, trans);
196 // enable color fading
205 trans = 7; // white in 8 color mode
207 trans = 0; // black in 8 color mode
212 init_pair(CP_WHITE, 0, trans);
213 init_pair(CP_BLACK, 7, 0);
215 init_pair(CP_WHITE, 7, trans);
216 init_pair(CP_BLACK, 0, 7);
218 init_pair(CP_BLUE, 4, trans);
219 init_pair(CP_RED, 1, trans);
220 init_pair(CP_YELLOW, 3, trans);
226 // set background color of main window
228 wbkgd(stdscr, COLOR_PAIR(CP_YELLOW));
231 WINDOW *content = newwin(LINES - bar_top - bar_bottom, COLS, 0 + bar_top, 0);
233 wbkgd(content, COLOR_PAIR(CP_WHITE));
241 // always resize window in case terminal geometry has changed
242 wresize(content, LINES - bar_top - bar_bottom, COLS);
247 offset = next_blank(line->text, 0) + 1;
248 // add text to header
250 0, (COLS - line->length + offset) / 2,
251 "%s", &line->text->text[offset]);
255 if(deck->headers > 1) {
256 line = deck->header->next;
257 offset = next_blank(line->text, 0) + 1;
258 // add text to left footer
261 "%s", &line->text->text[offset]);
263 // add slide number to right footer
265 LINES - 1, COLS - int_length(deck->slides) - int_length(sc) - 6,
266 "%d / %d", sc, deck->slides);
268 // make header + fooder visible
277 add_line(content, l, (COLS - max_cols) / 2, line, max_cols, colors);
278 l += (line->length / COLS) + 1;
282 // make content visible
287 fade_in(content, trans, colors, invert);
289 // re-enable fading after any undefined key press
290 if(COLORS == 256 && !nofade)
293 // wait for user input
296 // evaluate user input
300 // show previous slide
304 case 8: // BACKSPACE (ascii)
305 case 127: // BACKSPACE (xterm)
306 case 263: // BACKSPACE (getty)
343 if(i <= deck->slides) {
360 // disable fading if slide n doesn't exist
373 for(i = sc; i <= deck->slides; i++) {
383 // do not fade out on exit
389 // disable fading on undefined key press
396 fade_out(content, trans, colors, invert);
404 void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols, int colors) {
406 if(!line->text->text) {
411 int offset = 0; // text offset
413 // move the cursor in position
416 // IS_UNORDERED_LIST_3
417 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_3)) {
418 offset = next_nonblank(line->text, 0);
420 strcpy(&prompt[0], CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)? " | " : " ");
421 strcpy(&prompt[4], CHECK_BIT(line->bits, IS_UNORDERED_LIST_2)? " | " : " ");
423 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_EXT)) {
424 strcpy(&prompt[8], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_3)? " | " : " ");
426 strcpy(&prompt[8], " +- ");
433 if(!CHECK_BIT(line->bits, IS_CODE))
434 inline_display(window, &line->text->text[offset], colors);
436 // IS_UNORDERED_LIST_2
437 } else if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_2)) {
438 offset = next_nonblank(line->text, 0);
440 strcpy(&prompt[0], CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)? " | " : " ");
442 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_EXT)) {
443 strcpy(&prompt[4], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_2)? " | " : " ");
445 strcpy(&prompt[4], " +- ");
452 if(!CHECK_BIT(line->bits, IS_CODE))
453 inline_display(window, &line->text->text[offset], colors);
455 // IS_UNORDERED_LIST_1
456 } else if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)) {
457 offset = next_nonblank(line->text, 0);
460 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_EXT)) {
461 strcpy(&prompt[0], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_1)? " | " : " ");
463 strcpy(&prompt[0], " +- ");
470 if(!CHECK_BIT(line->bits, IS_CODE))
471 inline_display(window, &line->text->text[offset], colors);
475 if(CHECK_BIT(line->bits, IS_CODE)) {
477 // set static offset for code
478 offset = CODE_INDENT;
480 // reverse color for code blocks
482 wattron(window, COLOR_PAIR(CP_BLACK));
486 "%s", &line->text->text[offset]);
489 if(!CHECK_BIT(line->bits, IS_UNORDERED_LIST_1) &&
490 !CHECK_BIT(line->bits, IS_UNORDERED_LIST_2) &&
491 !CHECK_BIT(line->bits, IS_UNORDERED_LIST_3) &&
492 !CHECK_BIT(line->bits, IS_CODE)) {
495 if(CHECK_BIT(line->bits, IS_QUOTE)) {
496 while(line->text->text[offset] == '>') {
497 // print a reverse color block
499 wattron(window, COLOR_PAIR(CP_BLACK));
500 wprintw(window, "%s", " ");
501 wattron(window, COLOR_PAIR(CP_WHITE));
502 wprintw(window, "%s", " ");
504 wprintw(window, "%s", ">");
507 // find next quote or break
509 if(line->text->text[offset] == ' ')
510 offset = next_word(line->text, offset);
513 inline_display(window, &line->text->text[offset], colors);
517 if(CHECK_BIT(line->bits, IS_CENTER)) {
518 if(line->length < max_cols) {
519 wmove(window, y, x + ((max_cols - line->length) / 2));
524 if(CHECK_BIT(line->bits, IS_H1) || CHECK_BIT(line->bits, IS_H2)) {
526 // set headline color
528 wattron(window, COLOR_PAIR(CP_BLUE));
530 // enable underline for H1
531 if(CHECK_BIT(line->bits, IS_H1))
532 wattron(window, A_UNDERLINE);
535 while(line->text->text[offset] == '#')
536 offset = next_word(line->text, offset);
540 "%s", &line->text->text[offset]);
542 wattroff(window, A_UNDERLINE);
544 // no line-wide markdown
547 inline_display(window, &line->text->text[offset], colors);
552 // fill rest off line with spaces
553 for(i = getcurx(window) - x; i < max_cols; i++)
554 wprintw(window, "%s", " ");
556 // reset to default color
558 wattron(window, COLOR_PAIR(CP_WHITE));
559 wattroff(window, A_UNDERLINE);
562 void inline_display(WINDOW *window, const char *c, const int colors) {
563 const static char *special = "\\*_`"; // list of interpreted chars
564 const char *i = c; // iterator
565 cstack_t *stack = cstack_init();
568 // for each char in line
571 // if char is in special char list
572 if(strchr(special, *i)) {
574 // closing special char (or second backslash)
575 // only if not followed by :alnum:
576 if((stack->top)(stack, *i) &&
577 (!isalnum((int)i[1]) || *(i + 1) == '\0' || *i == '\\')) {
580 // print escaped backslash
582 wprintw(window, "%c", *i);
587 wattron(window, COLOR_PAIR(CP_WHITE));
591 wattroff(window, A_UNDERLINE);
593 // disable inline code
596 wattron(window, COLOR_PAIR(CP_WHITE));
600 // remove top special char from stack
603 // treat special as regular char
604 } else if((stack->top)(stack, '\\')) {
605 wprintw(window, "%c", *i);
607 // remove backslash from stack
610 // opening special char
613 // emphasis or code span can start after new-line or space only
614 // and of cause after another emphasis markup
615 if(*(i - 1) == ' ' ||
616 ((*(i - 1) == '_' || *(i - 1) == '*') && (*(i - 2) == ' ' || (i - 1) == c)) ||
624 wattron(window, COLOR_PAIR(CP_RED));
628 wattron(window, A_UNDERLINE);
630 // enable inline code
633 wattron(window, COLOR_PAIR(CP_BLACK));
635 // do nothing for backslashes
638 // push special char to stack
639 (stack->push)(stack, *i);
642 wprintw(window, "%c", *i);
647 // remove backslash from stack
648 if((stack->top)(stack, '\\'))
651 // print regular char
652 wprintw(window, "%c", *i);
656 // pop stack until empty to prevent formated trailing spaces
657 while(!(stack->empty)(stack)) {
658 switch((stack->pop)(stack)) {
662 wattron(window, COLOR_PAIR(CP_WHITE));
666 wattroff(window, A_UNDERLINE);
668 // disable inline code
671 wattron(window, COLOR_PAIR(CP_WHITE));
673 // do nothing for backslashes
677 (stack->delete)(stack);
680 void fade_out(WINDOW *window, int trans, int colors, int invert) {
682 if(colors && COLORS == 256) {
683 for(i = 22; i >= 0; i--) {
687 init_pair(CP_WHITE, white_ramp_invert[i], trans);
688 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
689 init_pair(CP_RED, red_ramp_invert[i], trans);
690 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
692 init_pair(CP_WHITE, white_ramp[i], trans);
693 init_pair(CP_BLUE, blue_ramp[i], trans);
694 init_pair(CP_RED, red_ramp[i], trans);
695 init_pair(CP_BLACK, 16, white_ramp[i]);
698 // refresh window with new color
701 // delay for our eyes to recognize the change
707 void fade_in(WINDOW *window, int trans, int colors, int invert) {
709 if(colors && COLORS == 256) {
710 for(i = 0; i <= 23; i++) {
712 // brighten color pairs
714 init_pair(CP_WHITE, white_ramp_invert[i], trans);
715 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
716 init_pair(CP_RED, red_ramp_invert[i], trans);
717 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
719 init_pair(CP_WHITE, white_ramp[i], trans);
720 init_pair(CP_BLUE, blue_ramp[i], trans);
721 init_pair(CP_RED, red_ramp[i], trans);
722 init_pair(CP_BLACK, 16, white_ramp[i]);
725 // refresh window with new color
728 // delay for our eyes to recognize the change
734 int int_length (int val) {