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 <wchar.h> // wcschr
26 #include <wctype.h> // iswalnum
27 #include <string.h> // strcpy
28 #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;
93 while(line && line->text) {
95 if (line->text->value)
96 lc += url_count_inline(line->text->value);
98 if (line->text->value)
99 line->length -= url_len_inline(line->text->value);
101 if(line->length > COLS) {
106 i = prev_blank(line->text, offset + COLS) - offset;
108 // single word is > COLS
110 // calculate min_width
111 i = next_blank(line->text, offset + COLS) - offset;
117 fwprintf(stderr, L"Error: Terminal width (%i columns) too small. Need at least %i columns.\n", COLS, i);
118 fwprintf(stderr, L"You may need to shorten some lines by inserting line breaks.\n");
125 max_cols = MAX(i, max_cols);
127 // iterate to next line
128 offset = prev_blank(line->text, offset + COLS);
129 i = line->length - offset;
132 // set max_cols one last time
133 max_cols = MAX(i, max_cols);
136 max_cols = MAX(line->length, max_cols);
142 max_lines = MAX(lc, max_lines);
148 if(max_lines + bar_top + bar_bottom > LINES) {
154 fwprintf(stderr, L"Error: Terminal height (%i lines) too small. Need at least %i lines.\n", LINES, max_lines + bar_top + bar_bottom);
155 fwprintf(stderr, L"You may need to add additional horizontal rules (---) to split your file in shorter slides.\n");
164 // disable output of keyboard typing
167 // make getch() process one char at a time
174 if(has_colors() == TRUE) {
176 use_default_colors();
183 trans = 15; // white in 256 color mode
185 trans = 16; // black in 256 color mode
190 init_pair(CP_WHITE, 232, trans);
191 init_pair(CP_BLUE, 21, trans);
192 init_pair(CP_RED, 196, trans);
193 init_pair(CP_BLACK, 15, 232);
195 init_pair(CP_WHITE, 255, trans);
196 init_pair(CP_BLUE, 123, trans);
197 init_pair(CP_RED, 213, trans);
198 init_pair(CP_BLACK, 16, 255);
200 init_pair(CP_YELLOW, 208, trans);
202 // enable color fading
211 trans = 7; // white in 8 color mode
213 trans = 0; // black in 8 color mode
218 init_pair(CP_WHITE, 0, trans);
219 init_pair(CP_BLACK, 7, 0);
221 init_pair(CP_WHITE, 7, trans);
222 init_pair(CP_BLACK, 0, 7);
224 init_pair(CP_BLUE, 4, trans);
225 init_pair(CP_RED, 1, trans);
226 init_pair(CP_YELLOW, 3, trans);
232 // set background color of main window
234 wbkgd(stdscr, COLOR_PAIR(CP_YELLOW));
237 WINDOW *content = newwin(LINES - bar_top - bar_bottom, COLS, 0 + bar_top, 0);
239 wbkgd(content, COLOR_PAIR(CP_WHITE));
243 // find slide to reload
244 while(reload > 1 && reload <= deck->slides) {
250 // reset reload indicator
261 // always resize window in case terminal geometry has changed
262 wresize(content, LINES - bar_top - bar_bottom, COLS);
267 offset = next_blank(line->text, 0) + 1;
268 // add text to header
270 0, (COLS - line->length + offset) / 2,
271 &line->text->value[offset]);
275 if(deck->headers > 1) {
276 line = deck->header->next;
277 offset = next_blank(line->text, 0) + 1;
278 // add text to left footer
281 &line->text->value[offset]);
284 // add slide number to right footer
286 LINES - 1, COLS - int_length(deck->slides) - int_length(sc) - 6,
287 "%d / %d", sc, deck->slides);
289 // make header + fooder visible
298 add_line(content, l, (COLS - max_cols) / 2, line, max_cols, colors);
299 l += (line->length / COLS) + 1;
304 getmaxyx( content, ymax, i );
305 for (i = 0; i < url_get_amount(); i++) {
306 mvwprintw(content, ymax - url_get_amount() - 1 + i, 3,
308 waddwstr(content, url_get_target(i));
311 // make content visible
316 fade_in(content, trans, colors, invert);
318 // re-enable fading after any undefined key press
319 if(COLORS == 256 && !nofade)
322 // wait for user input
325 // evaluate user input
329 // show previous slide
333 case 8: // BACKSPACE (ascii)
334 case 127: // BACKSPACE (xterm)
335 case 263: // BACKSPACE (getty)
372 i = get_slide_number(c);
373 if(i > 0 && i <= deck->slides) {
390 // disable fading if slide n doesn't exist
405 for(i = sc; i <= deck->slides; i++) {
420 // disable fading if reload is not possible
427 // do not fade out on exit
435 // disable fading on undefined key press
442 fade_out(content, trans, colors, invert);
450 // free ncurses memory
455 // return reload indicator (0 means no reload)
459 void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols, int colors) {
461 if(!line->text->value) {
466 int offset = 0; // text offset
468 // move the cursor in position
471 // IS_UNORDERED_LIST_3
472 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_3)) {
473 offset = next_nonblank(line->text, 0);
475 strcpy(&prompt[0], CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)? " | " : " ");
476 strcpy(&prompt[4], CHECK_BIT(line->bits, IS_UNORDERED_LIST_2)? " | " : " ");
478 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_EXT)) {
479 strcpy(&prompt[8], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_3)? " | " : " ");
481 strcpy(&prompt[8], " +- ");
488 if(!CHECK_BIT(line->bits, IS_CODE))
489 inline_display(window, &line->text->value[offset], colors);
491 // IS_UNORDERED_LIST_2
492 } else if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_2)) {
493 offset = next_nonblank(line->text, 0);
495 strcpy(&prompt[0], CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)? " | " : " ");
497 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_EXT)) {
498 strcpy(&prompt[4], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_2)? " | " : " ");
500 strcpy(&prompt[4], " +- ");
507 if(!CHECK_BIT(line->bits, IS_CODE))
508 inline_display(window, &line->text->value[offset], colors);
510 // IS_UNORDERED_LIST_1
511 } else if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_1)) {
512 offset = next_nonblank(line->text, 0);
515 if(CHECK_BIT(line->bits, IS_UNORDERED_LIST_EXT)) {
516 strcpy(&prompt[0], line->next && CHECK_BIT(line->next->bits, IS_UNORDERED_LIST_1)? " | " : " ");
518 strcpy(&prompt[0], " +- ");
525 if(!CHECK_BIT(line->bits, IS_CODE))
526 inline_display(window, &line->text->value[offset], colors);
530 if(CHECK_BIT(line->bits, IS_CODE)) {
532 // set static offset for code
533 offset = CODE_INDENT;
535 // reverse color for code blocks
537 wattron(window, COLOR_PAIR(CP_BLACK));
540 waddwstr(window, &line->text->value[offset]);
543 if(!CHECK_BIT(line->bits, IS_UNORDERED_LIST_1) &&
544 !CHECK_BIT(line->bits, IS_UNORDERED_LIST_2) &&
545 !CHECK_BIT(line->bits, IS_UNORDERED_LIST_3) &&
546 !CHECK_BIT(line->bits, IS_CODE)) {
549 if(CHECK_BIT(line->bits, IS_QUOTE)) {
550 while(line->text->value[offset] == '>') {
551 // print a reverse color block
553 wattron(window, COLOR_PAIR(CP_BLACK));
554 wprintw(window, "%s", " ");
555 wattron(window, COLOR_PAIR(CP_WHITE));
556 wprintw(window, "%s", " ");
558 wprintw(window, "%s", ">");
561 // find next quote or break
563 if(line->text->value[offset] == ' ')
564 offset = next_word(line->text, offset);
567 inline_display(window, &line->text->value[offset], colors);
571 if(CHECK_BIT(line->bits, IS_CENTER)) {
572 if(line->length < max_cols) {
573 wmove(window, y, x + ((max_cols - line->length) / 2));
578 if(CHECK_BIT(line->bits, IS_H1) || CHECK_BIT(line->bits, IS_H2)) {
580 // set headline color
582 wattron(window, COLOR_PAIR(CP_BLUE));
584 // enable underline for H1
585 if(CHECK_BIT(line->bits, IS_H1))
586 wattron(window, A_UNDERLINE);
589 while(line->text->value[offset] == '#')
590 offset = next_word(line->text, offset);
593 waddwstr(window, &line->text->value[offset]);
595 wattroff(window, A_UNDERLINE);
597 // no line-wide markdown
600 inline_display(window, &line->text->value[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 wchar_t *c, const int colors) {
616 const static wchar_t *special = L"\\*_`!["; // list of interpreted chars
617 const wchar_t *i = c; // iterator
618 const wchar_t *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(wcschr(special, *i)) {
629 // closing special char (or second backslash)
630 // only if not followed by :alnum:
631 if((stack->top)(stack, *i) &&
632 (!iswalnum(i[1]) || *(i + 1) == L'\0' || *i == L'\\')) {
635 // print escaped backslash
637 waddnwstr(window, i, 1);
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, L'\\')) {
660 waddnwstr(window, i, 1);
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
672 iswspace(*(i - 1)) ||
673 ((iswspace(*(i - 1)) || *(i - 1) == L'*' || *(i - 1) == L'_') &&
674 ((i - 1) == c || iswspace(*(i - 2)))) ||
677 // url in pandoc style
678 if ((*i == L'[' && wcschr(i, L']')) ||
679 (*i == L'!' && *(i + 1) == L'[' && wcschr(i, L']'))) {
683 if (wcschr(i, L']')[1] == L'(') {
686 // turn higlighting and underlining on
688 wattron(window, COLOR_PAIR(CP_BLUE));
689 wattron(window, A_UNDERLINE);
693 // print the content of the label
694 // the label is printed as is
696 waddnwstr(window, i, 1);
698 } while (*i != L']');
700 length_link_name = i - 1 - start_link_name;
707 while (*i != L')') i++;
709 url_num = url_add(start_link_name, length_link_name, start_url, i - start_url, 0, 0);
711 wprintw(window, " [%d]", url_num);
713 // turn highlighting and underlining off
714 wattroff(window, A_UNDERLINE);
715 wattron(window, COLOR_PAIR(CP_WHITE));
718 wprintw(window, "[");
725 wattron(window, COLOR_PAIR(CP_RED));
729 wattron(window, A_UNDERLINE);
731 // enable inline code
734 wattron(window, COLOR_PAIR(CP_BLACK));
736 // do nothing for backslashes
739 // push special char to stack
740 (stack->push)(stack, *i);
743 waddnwstr(window, i, 1);
748 // remove backslash from stack
749 if((stack->top)(stack, L'\\'))
752 // print regular char
753 waddnwstr(window, i, 1);
757 // pop stack until empty to prevent formated trailing spaces
758 while(!(stack->empty)(stack)) {
759 switch((stack->pop)(stack)) {
763 wattron(window, COLOR_PAIR(CP_WHITE));
767 wattroff(window, A_UNDERLINE);
769 // disable inline code
772 wattron(window, COLOR_PAIR(CP_WHITE));
774 // do nothing for backslashes
778 (stack->delete)(stack);
781 void fade_out(WINDOW *window, int trans, int colors, int invert) {
783 if(colors && COLORS == 256) {
784 for(i = 22; i >= 0; i--) {
788 init_pair(CP_WHITE, white_ramp_invert[i], trans);
789 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
790 init_pair(CP_RED, red_ramp_invert[i], trans);
791 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
793 init_pair(CP_WHITE, white_ramp[i], trans);
794 init_pair(CP_BLUE, blue_ramp[i], trans);
795 init_pair(CP_RED, red_ramp[i], trans);
796 init_pair(CP_BLACK, 16, white_ramp[i]);
799 // refresh window with new color
802 // delay for our eyes to recognize the change
808 void fade_in(WINDOW *window, int trans, int colors, int invert) {
810 if(colors && COLORS == 256) {
811 for(i = 0; i <= 23; i++) {
813 // brighten color pairs
815 init_pair(CP_WHITE, white_ramp_invert[i], trans);
816 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
817 init_pair(CP_RED, red_ramp_invert[i], trans);
818 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
820 init_pair(CP_WHITE, white_ramp[i], trans);
821 init_pair(CP_BLUE, blue_ramp[i], trans);
822 init_pair(CP_RED, red_ramp[i], trans);
823 init_pair(CP_BLACK, 16, white_ramp[i]);
826 // refresh window with new color
829 // delay for our eyes to recognize the change
835 int int_length (int val) {
844 int get_slide_number(char init) {
845 int retval = init - '0';
847 // block for tenths of a second when using getch, ERR if no input
848 halfdelay(GOTO_SLIDE_DELAY);
849 while((c = getch()) != ERR) {
850 if (c < '0' || c > '9') {
854 retval = (retval * 10) + (c - '0');
856 nocbreak(); // cancel half delay mode
857 cbreak(); // go back to cbreak