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
27 #include <string.h> // strchr
30 #include "include/viewer.h"
32 // color ramp for fading from black to color
33 static short white_ramp[24] = { 16, 232, 233, 234, 235, 236,
34 237, 238, 239, 240, 241, 242,
35 244, 245, 246, 247, 248, 249,
36 250, 251, 252, 253, 254, 255 };
38 static short blue_ramp[24] = { 16, 17, 17, 18, 18, 19,
39 19, 20, 20, 21, 27, 33,
40 32, 39, 38, 45, 44, 44,
41 81, 81, 51, 51, 123, 123 };
43 static short red_ramp[24] = { 16, 52, 52, 53, 53, 89,
44 89, 90, 90, 126, 127, 127,
45 163, 163, 164, 164, 200, 200,
46 201, 201, 207, 207, 213, 213 };
48 // color ramp for fading from white to color
49 static short white_ramp_invert[24] = { 15, 255, 254, 254, 252, 251,
50 250, 249, 248, 247, 246, 245,
51 243, 242, 241, 240, 239, 238,
52 237, 236, 235, 234, 233, 232};
54 static short blue_ramp_invert[24] = { 15, 231, 231, 195, 195, 159,
55 159, 123, 123, 87, 51, 44,
56 45, 38, 39, 32, 33, 33,
57 26, 26, 27, 27, 21, 21};
59 static short red_ramp_invert[24] = { 15, 231, 231, 224, 224, 225,
60 225, 218, 218, 219, 212, 213,
61 206, 207, 201, 200, 199, 199,
62 198, 198, 197, 197, 196, 196};
64 int ncurses_display(deck_t *deck, int notrans, int nofade, int invert) {
68 int l = 0; // line number
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;
87 // set max_lines if line count exceeded
88 max_lines = (slide->lines > max_lines) ? slide->lines : max_lines;
91 // set max_cols if length exceeded
92 max_cols = (line->length > max_cols) ? line->length : max_cols;
98 // set locale to display UTF-8 correctly in ncurses
99 setlocale(LC_CTYPE, "");
104 if((max_cols > COLS) ||
105 (max_lines + bar_top + bar_bottom + 2 > LINES)) {
111 fprintf(stderr, "Error: Terminal size %ix%i too small. Need at least %ix%i.\n",
112 COLS, LINES, max_cols, max_lines + bar_top + bar_bottom + 2);
114 // print hint to solve it
115 if(max_lines + bar_top + bar_bottom + 2 > LINES)
116 fprintf(stderr, "You may need to add additional horizontal rules ('***') to split your file in shorter slides.\n");
118 fprintf(stderr, "Automatic line wrapping is not supported jet. You may need to shorten some lines by inserting line breaks.\n");
126 // disable output of keyboard typing
129 // make getch() process one char at a time
136 if(has_colors() == TRUE) {
138 use_default_colors();
145 trans = 15; // white in 256 color mode
147 trans = 16; // black in 256 color mode
152 init_pair(CP_WHITE, 232, trans);
153 init_pair(CP_BLUE, 21, trans);
154 init_pair(CP_RED, 196, trans);
155 init_pair(CP_BLACK, 15, 232);
157 init_pair(CP_WHITE, 255, trans);
158 init_pair(CP_BLUE, 123, trans);
159 init_pair(CP_RED, 213, trans);
160 init_pair(CP_BLACK, 16, 255);
162 init_pair(CP_YELLOW, 208, trans);
164 // enable color fading
165 if(!nofade) fade = 1;
172 trans = 7; // white in 8 color mode
174 trans = 0; // black in 8 color mode
179 init_pair(CP_WHITE, 0, trans);
180 init_pair(CP_BLACK, 7, 0);
182 init_pair(CP_WHITE, 7, trans);
183 init_pair(CP_BLACK, 0, 7);
185 init_pair(CP_BLUE, 4, trans);
186 init_pair(CP_RED, 1, trans);
187 init_pair(CP_YELLOW, 3, trans);
193 // set background color of main window
195 wbkgd(stdscr, COLOR_PAIR(CP_YELLOW));
198 WINDOW *content = newwin(LINES - bar_top - bar_bottom, COLS, 0 + bar_top, 0);
200 wbkgd(content, COLOR_PAIR(CP_WHITE));
208 // always resize window in case terminal geometry has changed
209 wresize(content, LINES - bar_top - bar_bottom, COLS);
214 offset = next_blank(line->text, 0) + 1;
215 // add text to header
217 0, (COLS - line->length + offset) / 2,
218 "%s", &line->text->text[offset]);
222 if(deck->headers > 1) {
223 line = deck->header->next;
224 offset = next_blank(line->text, 0) + 1;
225 // add text to left footer
228 "%s", &line->text->text[offset]);
230 // add slide number to right footer
232 LINES - 1, COLS - int_length(deck->slides) - int_length(sc) - 6,
233 "%d / %d", sc, deck->slides);
235 // make header + fooder visible
243 add_line(content, l, (COLS - max_cols) / 2, line, max_cols, colors);
248 // make content visible
253 fade_in(content, trans, colors, invert);
255 // re-enable fading after any undefined key press
256 if(COLORS == 256 && !nofade) fade = 1;
258 // wait for user input
261 // evaluate user input
265 // show previous slide
268 case 8: // BACKSPACE (ascii)
269 case 127: // BACKSPACE (xterm)
270 case 263: // BACKSPACE (getty)
306 if(i <= deck->slides) {
323 // disable fading if slide n doesn't exist
336 for(i = sc; i <= deck->slides; i++) {
346 // do not fade out on exit
352 // disable fading on undefined key press
359 fade_out(content, trans, colors, invert);
367 void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols, int colors) {
368 int i = 0; // increment
369 char *c; // char pointer for iteration
370 char *special = "\\*_`"; // list of interpreted chars
371 cstack_t *stack = cstack_init();
373 if(line->text->text) {
374 int offset = 0; // text offset
377 if(CHECK_BIT(line->bits, IS_CODE)) {
379 // set static offset for code
380 offset = CODE_INDENT;
382 // reverse color for code blocks
384 wattron(window, COLOR_PAIR(CP_BLACK));
389 "%s", &line->text->text[offset]);
394 if(CHECK_BIT(line->bits, IS_H1) || CHECK_BIT(line->bits, IS_H2)) {
396 // set headline color
398 wattron(window, COLOR_PAIR(CP_BLUE));
400 // enable underline for H1
401 if(CHECK_BIT(line->bits, IS_H1))
402 wattron(window, A_UNDERLINE);
405 while(line->text->text[offset] == '#')
406 offset = next_word(line->text, offset);
411 "%s", &line->text->text[offset]);
413 wattroff(window, A_UNDERLINE);
416 // move the cursor in position
420 if(CHECK_BIT(line->bits, IS_QUOTE)) {
421 while(line->text->text[offset] == '>') {
422 // print a reverse color block
424 wattron(window, COLOR_PAIR(CP_BLACK));
425 wprintw(window, "%s", " ");
426 wattron(window, COLOR_PAIR(CP_WHITE));
427 wprintw(window, "%s", " ");
429 wprintw(window, "%s", ">");
432 // find next quote or break
434 if(line->text->text[offset] == ' ')
435 offset = next_word(line->text, offset);
439 // for each char in line
440 c = &line->text->text[offset];
443 // if char is in special char list
444 if(strchr(special, *c)) {
446 // closing special char (or second backslash)
447 if((stack->top)(stack, *c)) {
450 // print escaped backslash
452 wprintw(window, "%c", *c);
457 wattron(window, COLOR_PAIR(CP_WHITE));
461 wattroff(window, A_UNDERLINE);
463 // disable inline code
466 wattron(window, COLOR_PAIR(CP_WHITE));
470 // remove top special char from stack
473 // treat special as regular char
474 } else if((stack->top)(stack, '\\')) {
475 wprintw(window, "%c", *c);
477 // remove backslash from stack
480 // opening special char
486 wattron(window, COLOR_PAIR(CP_RED));
490 wattron(window, A_UNDERLINE);
492 // enable inline code
495 wattron(window, COLOR_PAIR(CP_BLACK));
497 // do nothing for backslashes
500 // push special char to stack
501 (stack->push)(stack, *c);
505 // remove backslash from stack
506 if((stack->top)(stack, '\\'))
509 // print regular char
510 wprintw(window, "%c", *c);
516 // pop stack until empty to prevent formated trailing spaces
517 while(!(stack->empty)(stack)) {
518 switch((stack->pop)(stack)) {
522 wattron(window, COLOR_PAIR(CP_WHITE));
526 wattroff(window, A_UNDERLINE);
528 // disable inline code
531 wattron(window, COLOR_PAIR(CP_WHITE));
533 // do nothing for backslashes
539 // fill rest off line with spaces
540 for(i = getcurx(window) - x; i < max_cols; i++)
541 wprintw(window, "%s", " ");
543 // reset to default color
545 wattron(window, COLOR_PAIR(CP_WHITE));
546 wattroff(window, A_UNDERLINE);
549 (stack->delete)(stack);
552 void fade_out(WINDOW *window, int trans, int colors, int invert) {
554 if(colors && COLORS == 256) {
555 for(i = 22; i >= 0; i--) {
559 init_pair(CP_WHITE, white_ramp_invert[i], trans);
560 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
561 init_pair(CP_RED, red_ramp_invert[i], trans);
562 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
564 init_pair(CP_WHITE, white_ramp[i], trans);
565 init_pair(CP_BLUE, blue_ramp[i], trans);
566 init_pair(CP_RED, red_ramp[i], trans);
567 init_pair(CP_BLACK, 16, white_ramp[i]);
570 // refresh window with new color
573 // delay for our eyes to recognize the change
579 void fade_in(WINDOW *window, int trans, int colors, int invert) {
581 if(colors && COLORS == 256) {
582 for(i = 0; i <= 23; i++) {
584 // brighten color pairs
586 init_pair(CP_WHITE, white_ramp_invert[i], trans);
587 init_pair(CP_BLUE, blue_ramp_invert[i], trans);
588 init_pair(CP_RED, red_ramp_invert[i], trans);
589 init_pair(CP_BLACK, 15, white_ramp_invert[i]);
591 init_pair(CP_WHITE, white_ramp[i], trans);
592 init_pair(CP_BLUE, blue_ramp[i], trans);
593 init_pair(CP_RED, red_ramp[i], trans);
594 init_pair(CP_BLACK, 16, white_ramp[i]);
597 // refresh window with new color
600 // delay for our eyes to recognize the change
606 int int_length (int val) {