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 <locale.h> // setlocale
26 #include <string.h> // strchr
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
276 add_line(content, l, (COLS - max_cols) / 2, line, max_cols, colors);
277 l += (line->length / COLS) + 1;
281 // make content visible
286 fade_in(content, trans, colors, invert);
288 // re-enable fading after any undefined key press
289 if(COLORS == 256 && !nofade)
292 // wait for user input
295 // evaluate user input
299 // show previous slide
303 case 8: // BACKSPACE (ascii)
304 case 127: // BACKSPACE (xterm)
305 case 263: // BACKSPACE (getty)
342 if(i <= deck->slides) {
359 // disable fading if slide n doesn't exist
372 for(i = sc; i <= deck->slides; i++) {
382 // do not fade out on exit
388 // disable fading on undefined key press
395 fade_out(content, trans, colors, invert);
403 void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols, int colors) {
405 if(!line->text->text) {
410 int offset = 0; // text offset
412 // move the cursor in position
415 // IS_UNORDERED_LIST_3
416 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_3)) {
417 offset = next_nonblank(line->text, 0);
419 strcpy(&prompt[0], CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)? " | " : " ");
420 strcpy(&prompt[4], CHECK_BIT(line->bits, IS_UNORDERED_LIST_2)? " | " : " ");
421 strcpy(&prompt[8], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_3)? " +- " : " `- ");
425 inline_display(window, &line->text->text[offset + 2], colors);
427 // IS_UNORDERED_LIST_2
428 } else if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_2)) {
429 offset = next_nonblank(line->text, 0);
431 strcpy(&prompt[0], CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)? " | " : " ");
432 strcpy(&prompt[4], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_2)? " +- " : " `- ");
436 inline_display(window, &line->text->text[offset + 2], colors);
438 // IS_UNORDERED_LIST_1
439 } else if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)) {
440 offset = next_nonblank(line->text, 0);
442 strcpy(&prompt[0], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_1)? " +- " : " `- ");
446 inline_display(window, &line->text->text[offset + 2], colors);
449 } else if(CHECK_BIT(line->bits, IS_CODE)) {
451 // set static offset for code
452 offset = CODE_INDENT;
454 // reverse color for code blocks
456 wattron(window, COLOR_PAIR(CP_BLACK));
460 "%s", &line->text->text[offset]);
463 } else if(CHECK_BIT(line->bits, IS_QUOTE)) {
464 while(line->text->text[offset] == '>') {
465 // print a reverse color block
467 wattron(window, COLOR_PAIR(CP_BLACK));
468 wprintw(window, "%s", " ");
469 wattron(window, COLOR_PAIR(CP_WHITE));
470 wprintw(window, "%s", " ");
472 wprintw(window, "%s", ">");
475 // find next quote or break
477 if(line->text->text[offset] == ' ')
478 offset = next_word(line->text, offset);
481 inline_display(window, &line->text->text[offset], colors);
486 if(CHECK_BIT(line->bits, IS_CENTER)) {
487 if(line->length < max_cols) {
488 wmove(window, y, x + ((max_cols - line->length) / 2));
493 if(CHECK_BIT(line->bits, IS_H1) || CHECK_BIT(line->bits, IS_H2)) {
495 // set headline color
497 wattron(window, COLOR_PAIR(CP_BLUE));
499 // enable underline for H1
500 if(CHECK_BIT(line->bits, IS_H1))
501 wattron(window, A_UNDERLINE);
504 while(line->text->text[offset] == '#')
505 offset = next_word(line->text, offset);
509 "%s", &line->text->text[offset]);
511 wattroff(window, A_UNDERLINE);
513 // no line-wide markdown
516 inline_display(window, &line->text->text[offset], colors);
520 // fill rest off line with spaces
521 for(i = getcurx(window) - x; i < max_cols; i++)
522 wprintw(window, "%s", " ");
524 // reset to default color
526 wattron(window, COLOR_PAIR(CP_WHITE));
527 wattroff(window, A_UNDERLINE);
530 void inline_display(WINDOW *window, const char *c, const int colors) {
531 const static char *special = "\\*_`"; // list of interpreted chars
532 cstack_t *stack = cstack_init();
534 // for each char in line
537 // if char is in special char list
538 if(strchr(special, *c)) {
540 // closing special char (or second backslash)
541 if((stack->top)(stack, *c)) {
544 // print escaped backslash
546 wprintw(window, "%c", *c);
551 wattron(window, COLOR_PAIR(CP_WHITE));
555 wattroff(window, A_UNDERLINE);
557 // disable inline code
560 wattron(window, COLOR_PAIR(CP_WHITE));
564 // remove top special char from stack
567 // treat special as regular char
568 } else if((stack->top)(stack, '\\')) {
569 wprintw(window, "%c", *c);
571 // remove backslash from stack
574 // opening special char
580 wattron(window, COLOR_PAIR(CP_RED));
584 wattron(window, A_UNDERLINE);
586 // enable inline code
589 wattron(window, COLOR_PAIR(CP_BLACK));
591 // do nothing for backslashes
594 // push special char to stack
595 (stack->push)(stack, *c);
599 // remove backslash from stack
600 if((stack->top)(stack, '\\'))
603 // print regular char
604 wprintw(window, "%c", *c);
608 // pop stack until empty to prevent formated trailing spaces
609 while(!(stack->empty)(stack)) {
610 switch((stack->pop)(stack)) {
614 wattron(window, COLOR_PAIR(CP_WHITE));
618 wattroff(window, A_UNDERLINE);
620 // disable inline code
623 wattron(window, COLOR_PAIR(CP_WHITE));
625 // do nothing for backslashes
629 (stack->delete)(stack);
632 void fade_out(WINDOW *window, int trans, int colors, int invert) {
634 if(colors && COLORS == 256) {
635 for(i = 22; i >= 0; i--) {
639 init_pair(CP_WHITE, white_ramp_invert[i], trans);
640 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
641 init_pair(CP_RED, red_ramp_invert[i], trans);
642 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
644 init_pair(CP_WHITE, white_ramp[i], trans);
645 init_pair(CP_BLUE, blue_ramp[i], trans);
646 init_pair(CP_RED, red_ramp[i], trans);
647 init_pair(CP_BLACK, 16, white_ramp[i]);
650 // refresh window with new color
653 // delay for our eyes to recognize the change
659 void fade_in(WINDOW *window, int trans, int colors, int invert) {
661 if(colors && COLORS == 256) {
662 for(i = 0; i <= 23; i++) {
664 // brighten color pairs
666 init_pair(CP_WHITE, white_ramp_invert[i], trans);
667 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
668 init_pair(CP_RED, red_ramp_invert[i], trans);
669 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
671 init_pair(CP_WHITE, white_ramp[i], trans);
672 init_pair(CP_BLUE, blue_ramp[i], trans);
673 init_pair(CP_RED, red_ramp[i], trans);
674 init_pair(CP_BLACK, 16, white_ramp[i]);
677 // refresh window with new color
680 // delay for our eyes to recognize the change
686 int int_length (int val) {