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 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, 32,
39 33, 38, 39, 44, 45, 45,
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 int ncurses_display(deck_t *deck, int notrans, int nofade) {
51 int l = 0; // line number
52 int sc = 1; // slide count
53 int colors = 0; // amount of colors supported
54 int fade = 0; // disable color fading by default
55 int trans = -1; // enable transparency if term supports it
56 int max_lines = 0; // max lines per slide
57 int max_cols = 0; // max columns per line
58 int offset; // text offset
60 // header line 1 is displayed at the top
61 int bar_top = (deck->headers > 0) ? 1 : 0;
62 // header line 2 is displayed at the bottom
63 // anyway we display the slide number at the bottom
66 slide_t *slide = deck->slide;
70 // set max_lines if line count exceeded
71 max_lines = (slide->lines > max_lines) ? slide->lines : max_lines;
74 // set max_cols if length exceeded
75 max_cols = (line->length > max_cols) ? line->length : max_cols;
81 // set locale to display UTF-8 correctly in ncurses
82 setlocale(LC_CTYPE, "");
87 if((max_cols > COLS) ||
88 (max_lines + bar_top + bar_bottom + 2 > LINES)) {
90 fprintf(stderr, "Error: Terminal size %ix%i too small. Need at least %ix%i.\n",
91 COLS, LINES, max_cols, max_lines + bar_top + bar_bottom + 2);
96 // replace stdin with current tty if markdown input was piped
97 freopen("/dev/tty", "rw", stdin);
102 // disable output of keyboard typing
105 // make getch() process one char at a time
112 if(has_colors() == TRUE) {
114 use_default_colors();
116 if(notrans) trans = 0; // black in 8 color mode
119 if(notrans) trans = 16; // black in 256 color mode
122 init_pair(CP_WHITE, 255, trans);
123 init_pair(CP_BLUE, 123, trans);
124 init_pair(CP_RED, 213, trans);
125 init_pair(CP_YELLOW, 208, trans);
127 // enable color fading
128 if(!nofade) fade = 1;
132 init_pair(CP_WHITE, 7, trans);
133 init_pair(CP_BLUE, 4, trans);
134 init_pair(CP_RED, 1, trans);
135 init_pair(CP_YELLOW, 3, trans);
141 // set background color of main window
143 wbkgd(stdscr, COLOR_PAIR(CP_YELLOW));
146 WINDOW *content = newwin(LINES - bar_top - bar_bottom, COLS, 0 + bar_top, 0);
148 wbkgd(content, COLOR_PAIR(CP_WHITE));
156 // always resize window in case terminal geometry has changed
157 wresize(content, LINES - bar_top - bar_bottom, COLS);
162 offset = next_blank(line->text, 0) + 1;
163 // add text to header
165 0, (COLS - line->length + offset) / 2,
166 "%s", &line->text->text[offset]);
170 if(deck->headers > 1) {
171 line = deck->header->next;
172 offset = next_blank(line->text, 0) + 1;
173 // add text to left footer
176 "%s", &line->text->text[offset]);
178 // add slide number to right footer
180 LINES - 1, COLS - int_length(deck->slides) - int_length(sc) - 6,
181 "%d / %d", sc, deck->slides);
183 // make header + fooder visible
191 add_line(content, l, (COLS - max_cols) / 2, line, max_cols, colors);
196 // make content visible
201 fade_in(content, trans, colors);
203 // re-enable fading after any undefined key press
204 if(COLORS == 256 && !nofade) fade = 1;
206 // wait for user input
209 // evaluate user input
213 // show previous slide
216 case 8: // BACKSPACE (ascii)
217 case 127: // BACKSPACE (xterm)
218 case 263: // BACKSPACE (getty)
250 if(i <= deck->slides) {
267 // disable fading if slide n doesn't exist
280 for(i = sc; i <= deck->slides; i++) {
290 // do not fade out on exit
296 // disable fading on undefined key press
303 fade_out(content, trans, colors);
311 void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols, int colors) {
312 int i = 0; // increment
313 char *c; // char pointer for iteration
314 char *special = "\\*_"; // list of interpreted chars
315 cstack_t *stack = cstack_init();
317 if(line->text->text) {
318 int offset = 0; // text offset
321 if(CHECK_BIT(line->bits, IS_CODE)) {
323 // set static offset for code
324 offset = CODE_INDENT;
326 // reverse color for code blocks
327 wattron(window, A_REVERSE);
332 "%s", &line->text->text[offset]);
337 if(CHECK_BIT(line->bits, IS_H1) || CHECK_BIT(line->bits, IS_H2)) {
339 // set headline color
341 wattron(window, COLOR_PAIR(CP_BLUE));
343 // enable underline for H1
344 if(CHECK_BIT(line->bits, IS_H1))
345 wattron(window, A_UNDERLINE);
348 while(line->text->text[offset] == '#')
349 offset = next_word(line->text, offset);
354 "%s", &line->text->text[offset]);
356 wattroff(window, A_UNDERLINE);
359 // move the cursor in position
363 if(CHECK_BIT(line->bits, IS_QUOTE)) {
364 while(line->text->text[offset] == '>') {
365 // print a reverse color block
366 wattron(window, A_REVERSE);
367 wprintw(window, "%s", " ");
368 wattroff(window, A_REVERSE);
369 wprintw(window, "%s", " ");
370 // find next quote or break
372 if(line->text->text[offset] == ' ')
373 offset = next_word(line->text, offset);
377 // for each char in line
378 c = &line->text->text[offset];
381 // if char is in special char list
382 if(strchr(special, *c)) {
384 // closing special char (or second backslash)
385 if((stack->top)(stack, *c)) {
388 // print escaped backslash
390 wprintw(window, "%c", *c);
395 wattron(window, COLOR_PAIR(CP_WHITE));
399 wattroff(window, A_UNDERLINE);
403 // remove top special char from stack
406 // treat special as regular char
407 } else if((stack->top)(stack, '\\')) {
408 wprintw(window, "%c", *c);
410 // remove backslash from stack
413 // opening special char
419 wattron(window, COLOR_PAIR(CP_RED));
423 wattron(window, A_UNDERLINE);
425 // do nothing for backslashes
428 // push special char to stack
429 (stack->push)(stack, *c);
433 // print regular char
434 wprintw(window, "%c", *c);
440 // pop stack until empty to prevent formated trailing spaces
441 while(!(stack->empty)(stack)) {
442 switch((stack->pop)(stack)) {
446 wattron(window, COLOR_PAIR(CP_WHITE));
450 wattroff(window, A_UNDERLINE);
452 // do nothing for backslashes
458 // fill rest off line with spaces
459 for(i = getcurx(window) - x; i < max_cols; i++)
460 wprintw(window, "%s", " ");
462 // reset to default color
464 wattron(window, COLOR_PAIR(CP_WHITE));
465 wattroff(window, A_UNDERLINE);
466 wattroff(window, A_REVERSE);
469 (stack->delete)(stack);
472 void fade_out(WINDOW *window, int trans, int colors) {
475 for(i = 22; i >= 0; i--) {
476 // darken color pairs
477 init_pair(CP_WHITE, white_ramp[i], trans);
478 init_pair(CP_BLUE, blue_ramp[i], trans);
479 init_pair(CP_RED, red_ramp[i], trans);
480 // refresh window with new color
482 // delay for our eyes to recognize the change
488 void fade_in(WINDOW *window, int trans, int colors) {
491 for(i = 0; i <= 23; i++) {
492 // lighten color pairs
493 init_pair(CP_WHITE, white_ramp[i], trans);
494 init_pair(CP_BLUE, blue_ramp[i], trans);
495 init_pair(CP_RED, red_ramp[i], trans);
496 // refresh window with new color
498 // delay for our eyes to recognize the change
504 int int_length (int val) {