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, int reload, int noreload) {
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, "");
96 while(line && line->text) {
99 lc += url_count_inline(line->text->text);
101 if (line->text->text)
102 line->length -= url_len_inline(line->text->text);
104 if(line->length > COLS) {
109 i = prev_blank(line->text, offset + COLS) - offset;
111 // single word is > COLS
113 // calculate min_width
114 i = next_blank(line->text, offset + COLS) - offset;
120 fprintf(stderr, "Error: Terminal width (%i columns) too small. Need at least %i columns.\n", COLS, i);
121 fprintf(stderr, "You may need to shorten some lines by inserting line breaks.\n");
128 max_cols = MAX(i, max_cols);
130 // iterate to next line
131 offset = prev_blank(line->text, offset + COLS);
132 i = line->length - offset;
135 // set max_cols one last time
136 max_cols = MAX(i, max_cols);
139 max_cols = MAX(line->length, max_cols);
145 max_lines = MAX(lc, max_lines);
151 if(max_lines + bar_top + bar_bottom > LINES) {
157 fprintf(stderr, "Error: Terminal height (%i lines) too small. Need at least %i lines.\n", LINES, max_lines + bar_top + bar_bottom);
158 fprintf(stderr, "You may need to add additional horizontal rules (---) to split your file in shorter slides.\n");
167 // disable output of keyboard typing
170 // make getch() process one char at a time
177 if(has_colors() == TRUE) {
179 use_default_colors();
186 trans = 15; // white in 256 color mode
188 trans = 16; // black in 256 color mode
193 init_pair(CP_WHITE, 232, trans);
194 init_pair(CP_BLUE, 21, trans);
195 init_pair(CP_RED, 196, trans);
196 init_pair(CP_BLACK, 15, 232);
198 init_pair(CP_WHITE, 255, trans);
199 init_pair(CP_BLUE, 123, trans);
200 init_pair(CP_RED, 213, trans);
201 init_pair(CP_BLACK, 16, 255);
203 init_pair(CP_YELLOW, 208, trans);
205 // enable color fading
214 trans = 7; // white in 8 color mode
216 trans = 0; // black in 8 color mode
221 init_pair(CP_WHITE, 0, trans);
222 init_pair(CP_BLACK, 7, 0);
224 init_pair(CP_WHITE, 7, trans);
225 init_pair(CP_BLACK, 0, 7);
227 init_pair(CP_BLUE, 4, trans);
228 init_pair(CP_RED, 1, trans);
229 init_pair(CP_YELLOW, 3, trans);
235 // set background color of main window
237 wbkgd(stdscr, COLOR_PAIR(CP_YELLOW));
240 WINDOW *content = newwin(LINES - bar_top - bar_bottom, COLS, 0 + bar_top, 0);
242 wbkgd(content, COLOR_PAIR(CP_WHITE));
246 // find slide to reload
247 while(reload > 1 && reload <= deck->slides) {
253 // reset reload indicator
264 // always resize window in case terminal geometry has changed
265 wresize(content, LINES - bar_top - bar_bottom, COLS);
270 offset = next_blank(line->text, 0) + 1;
271 // add text to header
273 0, (COLS - line->length + offset) / 2,
274 "%s", &line->text->text[offset]);
278 if(deck->headers > 1) {
279 line = deck->header->next;
280 offset = next_blank(line->text, 0) + 1;
281 // add text to left footer
284 "%s", &line->text->text[offset]);
286 // add slide number to right footer
288 LINES - 1, COLS - int_length(deck->slides) - int_length(sc) - 6,
289 "%d / %d", sc, deck->slides);
291 // make header + fooder visible
300 add_line(content, l, (COLS - max_cols) / 2, line, max_cols, colors);
301 l += (line->length / COLS) + 1;
306 getmaxyx( content, ymax, i );
307 for (i = 0; i < url_get_amount(); i++) {
308 mvwprintw(content, ymax - url_get_amount() - 1 + i, 3,
309 "[%d] %s", i, url_get_target(i));
312 // make content visible
317 fade_in(content, trans, colors, invert);
319 // re-enable fading after any undefined key press
320 if(COLORS == 256 && !nofade)
323 // wait for user input
326 // evaluate user input
330 // show previous slide
334 case 8: // BACKSPACE (ascii)
335 case 127: // BACKSPACE (xterm)
336 case 263: // BACKSPACE (getty)
373 if(i <= deck->slides) {
390 // disable fading if slide n doesn't exist
403 for(i = sc; i <= deck->slides; i++) {
418 // disable fading if reload is not possible
425 // do not fade out on exit
433 // disable fading on undefined key press
440 fade_out(content, trans, colors, invert);
448 // free ncurses memory
453 // return reload indicator (0 means no reload)
457 void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols, int colors) {
459 if(!line->text->text) {
464 int offset = 0; // text offset
466 // move the cursor in position
469 // IS_UNORDERED_LIST_3
470 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_3)) {
471 offset = next_nonblank(line->text, 0);
473 strcpy(&prompt[0], CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)? " | " : " ");
474 strcpy(&prompt[4], CHECK_BIT(line->bits, IS_UNORDERED_LIST_2)? " | " : " ");
476 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_EXT)) {
477 strcpy(&prompt[8], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_3)? " | " : " ");
479 strcpy(&prompt[8], " +- ");
486 if(!CHECK_BIT(line->bits, IS_CODE))
487 inline_display(window, &line->text->text[offset], colors);
489 // IS_UNORDERED_LIST_2
490 } else if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_2)) {
491 offset = next_nonblank(line->text, 0);
493 strcpy(&prompt[0], CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)? " | " : " ");
495 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_EXT)) {
496 strcpy(&prompt[4], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_2)? " | " : " ");
498 strcpy(&prompt[4], " +- ");
505 if(!CHECK_BIT(line->bits, IS_CODE))
506 inline_display(window, &line->text->text[offset], colors);
508 // IS_UNORDERED_LIST_1
509 } else if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)) {
510 offset = next_nonblank(line->text, 0);
513 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_EXT)) {
514 strcpy(&prompt[0], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_1)? " | " : " ");
516 strcpy(&prompt[0], " +- ");
523 if(!CHECK_BIT(line->bits, IS_CODE))
524 inline_display(window, &line->text->text[offset], colors);
528 if(CHECK_BIT(line->bits, IS_CODE)) {
530 // set static offset for code
531 offset = CODE_INDENT;
533 // reverse color for code blocks
535 wattron(window, COLOR_PAIR(CP_BLACK));
539 "%s", &line->text->text[offset]);
542 if(!CHECK_BIT(line->bits, IS_UNORDERED_LIST_1) &&
543 !CHECK_BIT(line->bits, IS_UNORDERED_LIST_2) &&
544 !CHECK_BIT(line->bits, IS_UNORDERED_LIST_3) &&
545 !CHECK_BIT(line->bits, IS_CODE)) {
548 if(CHECK_BIT(line->bits, IS_QUOTE)) {
549 while(line->text->text[offset] == '>') {
550 // print a reverse color block
552 wattron(window, COLOR_PAIR(CP_BLACK));
553 wprintw(window, "%s", " ");
554 wattron(window, COLOR_PAIR(CP_WHITE));
555 wprintw(window, "%s", " ");
557 wprintw(window, "%s", ">");
560 // find next quote or break
562 if(line->text->text[offset] == ' ')
563 offset = next_word(line->text, offset);
566 inline_display(window, &line->text->text[offset], colors);
570 if(CHECK_BIT(line->bits, IS_CENTER)) {
571 if(line->length < max_cols) {
572 wmove(window, y, x + ((max_cols - line->length) / 2));
577 if(CHECK_BIT(line->bits, IS_H1) || CHECK_BIT(line->bits, IS_H2)) {
579 // set headline color
581 wattron(window, COLOR_PAIR(CP_BLUE));
583 // enable underline for H1
584 if(CHECK_BIT(line->bits, IS_H1))
585 wattron(window, A_UNDERLINE);
588 while(line->text->text[offset] == '#')
589 offset = next_word(line->text, offset);
593 "%s", &line->text->text[offset]);
595 wattroff(window, A_UNDERLINE);
597 // no line-wide markdown
600 inline_display(window, &line->text->text[offset], colors);
605 // fill rest off line with spaces
606 for(i = getcurx(window) - x; i < max_cols; i++)
607 wprintw(window, "%s", " ");
609 // reset to default color
611 wattron(window, COLOR_PAIR(CP_WHITE));
612 wattroff(window, A_UNDERLINE);
615 void inline_display(WINDOW *window, const char *c, const int colors) {
616 const static char *special = "\\*_`!["; // list of interpreted chars
617 const char *i = c; // iterator
618 const char *start_link_name, *start_url;
619 int length_link_name, url_num;
620 cstack_t *stack = cstack_init();
623 // for each char in line
626 // if char is in special char list
627 if(strchr(special, *i)) {
629 // closing special char (or second backslash)
630 // only if not followed by :alnum:
631 if((stack->top)(stack, *i) &&
632 (!isalnum((int)i[1]) || *(i + 1) == '\0' || *i == '\\')) {
635 // print escaped backslash
637 wprintw(window, "%c", *i);
642 wattron(window, COLOR_PAIR(CP_WHITE));
646 wattroff(window, A_UNDERLINE);
648 // disable inline code
651 wattron(window, COLOR_PAIR(CP_WHITE));
655 // remove top special char from stack
658 // treat special as regular char
659 } else if((stack->top)(stack, '\\')) {
660 wprintw(window, "%c", *i);
662 // remove backslash from stack
665 // opening special char
668 // emphasis or code span can start after new-line or space only
669 // and of cause after another emphasis markup
670 //TODO this condition looks ugly
673 ((*(i - 1) == '_' || *(i - 1) == '*') && ((i - 1) == c || *(i - 2) == ' ')) ||
676 // url in pandoc style
677 if ((*i == '[' && strchr(i, ']')) ||
678 (*i == '!' && *(i + 1) == '[' && strchr(i, ']'))) {
682 if (strchr(i, ']')[1] == '(') {
685 // turn higlighting and underlining on
687 wattron(window, COLOR_PAIR(CP_BLUE));
688 wattron(window, A_UNDERLINE);
692 // print the content of the label
693 // the label is printed as is
695 wprintw(window, "%c", *i);
699 length_link_name = i - 1 - start_link_name;
706 while (*i != ')') i++;
708 url_num = url_add(start_link_name, length_link_name, start_url, i - start_url, 0,0);
710 wprintw(window, " [%d]", url_num);
712 // turn highlighting and underlining off
713 wattroff(window, A_UNDERLINE);
714 wattron(window, COLOR_PAIR(CP_WHITE));
717 wprintw(window, "[");
724 wattron(window, COLOR_PAIR(CP_RED));
728 wattron(window, A_UNDERLINE);
730 // enable inline code
733 wattron(window, COLOR_PAIR(CP_BLACK));
735 // do nothing for backslashes
738 // push special char to stack
739 (stack->push)(stack, *i);
742 wprintw(window, "%c", *i);
747 // remove backslash from stack
748 if((stack->top)(stack, '\\'))
751 // print regular char
752 wprintw(window, "%c", *i);
756 // pop stack until empty to prevent formated trailing spaces
757 while(!(stack->empty)(stack)) {
758 switch((stack->pop)(stack)) {
762 wattron(window, COLOR_PAIR(CP_WHITE));
766 wattroff(window, A_UNDERLINE);
768 // disable inline code
771 wattron(window, COLOR_PAIR(CP_WHITE));
773 // do nothing for backslashes
777 (stack->delete)(stack);
780 void fade_out(WINDOW *window, int trans, int colors, int invert) {
782 if(colors && COLORS == 256) {
783 for(i = 22; i >= 0; i--) {
787 init_pair(CP_WHITE, white_ramp_invert[i], trans);
788 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
789 init_pair(CP_RED, red_ramp_invert[i], trans);
790 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
792 init_pair(CP_WHITE, white_ramp[i], trans);
793 init_pair(CP_BLUE, blue_ramp[i], trans);
794 init_pair(CP_RED, red_ramp[i], trans);
795 init_pair(CP_BLACK, 16, white_ramp[i]);
798 // refresh window with new color
801 // delay for our eyes to recognize the change
807 void fade_in(WINDOW *window, int trans, int colors, int invert) {
809 if(colors && COLORS == 256) {
810 for(i = 0; i <= 23; i++) {
812 // brighten color pairs
814 init_pair(CP_WHITE, white_ramp_invert[i], trans);
815 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
816 init_pair(CP_RED, red_ramp_invert[i], trans);
817 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
819 init_pair(CP_WHITE, white_ramp[i], trans);
820 init_pair(CP_BLUE, blue_ramp[i], trans);
821 init_pair(CP_RED, red_ramp[i], trans);
822 init_pair(CP_BLACK, 16, white_ramp[i]);
825 // refresh window with new color
828 // delay for our eyes to recognize the change
834 int int_length (int val) {