+++ /dev/null
-/*
- * Functions necessary to display a deck of slides in different color modes
- * using ncurses. Only white, red, and blue are supported, as they can be
- * faded in 256 color mode.
- * Copyright (C) 2014 Michael Goehler
- *
- * This file is part of mdp.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#include <locale.h> // setlocale
-#include <stdlib.h>
-#include <string.h> // strchr
-#include <unistd.h>
-
-#include "include/viewer.h"
-
-// color ramp for fading from black to color
-static short white_ramp[24] = { 16, 232, 233, 234, 235, 236,
- 237, 238, 239, 240, 241, 242,
- 244, 245, 246, 247, 248, 249,
- 250, 251, 252, 253, 254, 255 };
-
-static short blue_ramp[24] = { 16, 17, 17, 18, 18, 19,
- 19, 20, 20, 21, 27, 33,
- 32, 39, 38, 45, 44, 44,
- 81, 81, 51, 51, 123, 123 };
-
-static short red_ramp[24] = { 16, 52, 52, 53, 53, 89,
- 89, 90, 90, 126, 127, 127,
- 163, 163, 164, 164, 200, 200,
- 201, 201, 207, 207, 213, 213 };
-
-// color ramp for fading from white to color
-static short white_ramp_invert[24] = { 15, 255, 254, 254, 252, 251,
- 250, 249, 248, 247, 246, 245,
- 243, 242, 241, 240, 239, 238,
- 237, 236, 235, 234, 233, 232};
-
-static short blue_ramp_invert[24] = { 15, 231, 231, 195, 195, 159,
- 159, 123, 123, 87, 51, 44,
- 45, 38, 39, 32, 33, 33,
- 26, 26, 27, 27, 21, 21};
-
-static short red_ramp_invert[24] = { 15, 231, 231, 224, 224, 225,
- 225, 218, 218, 219, 212, 213,
- 206, 207, 201, 200, 199, 199,
- 198, 198, 197, 197, 196, 196};
-
-int ncurses_display(deck_t *deck, int notrans, int nofade, int invert) {
-
- int c = 0; // char
- int i = 0; // iterate
- int l = 0; // line number
- int sc = 1; // slide count
- int colors = 0; // amount of colors supported
- int fade = 0; // disable color fading by default
- int trans = -1; // enable transparency if term supports it
- int max_lines = 0; // max lines per slide
- int max_cols = 0; // max columns per line
- int offset; // text offset
-
- // header line 1 is displayed at the top
- int bar_top = (deck->headers > 0) ? 1 : 0;
- // header line 2 is displayed at the bottom
- // anyway we display the slide number at the bottom
- int bar_bottom = 1;
-
- slide_t *slide = deck->slide;
- line_t *line;
-
- while(slide) {
- // set max_lines if line count exceeded
- max_lines = (slide->lines > max_lines) ? slide->lines : max_lines;
- line = slide->line;
- while(line) {
- // set max_cols if length exceeded
- max_cols = (line->length > max_cols) ? line->length : max_cols;
- line = line->next;
- }
- slide = slide->next;
- }
-
- // set locale to display UTF-8 correctly in ncurses
- setlocale(LC_CTYPE, "");
-
- // init ncurses
- initscr();
-
- if((max_cols > COLS) ||
- (max_lines + bar_top + bar_bottom + 2 > LINES)) {
-
- // disable ncurses
- endwin();
-
- // print error
- fprintf(stderr, "Error: Terminal size %ix%i too small. Need at least %ix%i.\n",
- COLS, LINES, max_cols, max_lines + bar_top + bar_bottom + 2);
-
- // print hint to solve it
- if(max_lines + bar_top + bar_bottom + 2 > LINES)
- fprintf(stderr, "You may need to add additional horizontal rules ('***') to split your file in shorter slides.\n");
- if(max_cols > COLS)
- fprintf(stderr, "Automatic line wrapping is not supported jet. You may need to shorten some lines by inserting line breaks.\n");
-
- return(1);
- }
-
- // disable cursor
- curs_set(0);
-
- // disable output of keyboard typing
- noecho();
-
- // make getch() process one char at a time
- cbreak();
-
- // enable arrow keys
- keypad(stdscr,TRUE);
-
- // set colors
- if(has_colors() == TRUE) {
- start_color();
- use_default_colors();
-
- // 256 color mode
- if(COLORS == 256) {
-
- if(notrans) {
- if(invert) {
- trans = 15; // white in 256 color mode
- } else {
- trans = 16; // black in 256 color mode
- }
- }
-
- if(invert) {
- init_pair(CP_WHITE, 232, trans);
- init_pair(CP_BLUE, 21, trans);
- init_pair(CP_RED, 196, trans);
- init_pair(CP_BLACK, 15, 232);
- } else {
- init_pair(CP_WHITE, 255, trans);
- init_pair(CP_BLUE, 123, trans);
- init_pair(CP_RED, 213, trans);
- init_pair(CP_BLACK, 16, 255);
- }
- init_pair(CP_YELLOW, 208, trans);
-
- // enable color fading
- if(!nofade) fade = 1;
-
- // 8 color mode
- } else {
-
- if(notrans) {
- if(invert) {
- trans = 7; // white in 8 color mode
- } else {
- trans = 0; // black in 8 color mode
- }
- }
-
- if(invert) {
- init_pair(CP_WHITE, 0, trans);
- init_pair(CP_BLACK, 7, 0);
- } else {
- init_pair(CP_WHITE, 7, trans);
- init_pair(CP_BLACK, 0, 7);
- }
- init_pair(CP_BLUE, 4, trans);
- init_pair(CP_RED, 1, trans);
- init_pair(CP_YELLOW, 3, trans);
- }
-
- colors = 1;
- }
-
- // set background color of main window
- if(colors)
- wbkgd(stdscr, COLOR_PAIR(CP_YELLOW));
-
- // setup main window
- WINDOW *content = newwin(LINES - bar_top - bar_bottom, COLS, 0 + bar_top, 0);
- if(colors)
- wbkgd(content, COLOR_PAIR(CP_WHITE));
-
- slide = deck->slide;
- while(slide) {
- // clear windows
- werase(content);
- werase(stdscr);
-
- // always resize window in case terminal geometry has changed
- wresize(content, LINES - bar_top - bar_bottom, COLS);
-
- // setup header
- if(bar_top) {
- line = deck->header;
- offset = next_blank(line->text, 0) + 1;
- // add text to header
- mvwprintw(stdscr,
- 0, (COLS - line->length + offset) / 2,
- "%s", &line->text->text[offset]);
- }
-
- // setup footer
- if(deck->headers > 1) {
- line = deck->header->next;
- offset = next_blank(line->text, 0) + 1;
- // add text to left footer
- mvwprintw(stdscr,
- LINES - 1, 3,
- "%s", &line->text->text[offset]);
- }
- // add slide number to right footer
- mvwprintw(stdscr,
- LINES - 1, COLS - int_length(deck->slides) - int_length(sc) - 6,
- "%d / %d", sc, deck->slides);
-
- // make header + fooder visible
- wrefresh(stdscr);
-
- line = slide->line;
- l = 0;
-
- // print lines
- while(line) {
- add_line(content, l, (COLS - max_cols) / 2, line, max_cols, colors);
- line = line->next;
- l++;
- }
-
- // make content visible
- wrefresh(content);
-
- // fade in
- if(fade)
- fade_in(content, trans, colors, invert);
-
- // re-enable fading after any undefined key press
- if(COLORS == 256 && !nofade) fade = 1;
-
- // wait for user input
- c = getch();
-
- // evaluate user input
- i = 0;
- switch(c) {
-
- // show previous slide
- case KEY_UP:
- case KEY_LEFT:
- case 8: // BACKSPACE (ascii)
- case 127: // BACKSPACE (xterm)
- case 263: // BACKSPACE (getty)
- case 'h':
- case 'k':
- if(slide->prev) {
- slide = slide->prev;
- sc--;
- } else {
- fade = 0;
- }
- break;
-
- // show next slide
- case KEY_DOWN:
- case KEY_RIGHT:
- case '\n': // ENTER
- case ' ': // SPACE
- case 'j':
- case 'l':
- if(slide->next) {
- slide = slide->next;
- sc++;
- } else {
- fade = 0;
- }
- break;
-
- // show slide n
- case '9': i++;
- case '8': i++;
- case '7': i++;
- case '6': i++;
- case '5': i++;
- case '4': i++;
- case '3': i++;
- case '2': i++;
- case '1': i++;
- if(i <= deck->slides) {
- while(sc != i) {
- // search forward
- if(sc < i) {
- if(slide->next) {
- slide = slide->next;
- sc++;
- }
- // search backward
- } else {
- if(slide->prev) {
- slide = slide->prev;
- sc--;
- }
- }
- }
- } else {
- // disable fading if slide n doesn't exist
- fade = 0;
- }
- break;
-
- // show first slide
- case KEY_HOME:
- slide = deck->slide;
- sc = 1;
- break;
-
- // show last slide
- case KEY_END:
- for(i = sc; i <= deck->slides; i++) {
- if(slide->next) {
- slide = slide->next;
- sc++;
- }
- }
- break;
-
- // quit
- case 'q':
- // do not fade out on exit
- fade = 0;
- slide = (void*)0;
- break;
-
- default:
- // disable fading on undefined key press
- fade = 0;
- break;
- }
-
- // fade out
- if(fade)
- fade_out(content, trans, colors, invert);
- }
-
- endwin();
-
- return(0);
-}
-
-void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols, int colors) {
- int i = 0; // increment
- char *c; // char pointer for iteration
- char *special = "\\*_`"; // list of interpreted chars
- cstack_t *stack = cstack_init();
-
- if(line->text->text) {
- int offset = 0; // text offset
-
- // IS_CODE
- if(CHECK_BIT(line->bits, IS_CODE)) {
-
- // set static offset for code
- offset = CODE_INDENT;
-
- // reverse color for code blocks
- if(colors)
- wattron(window, COLOR_PAIR(CP_BLACK));
-
- // print whole lines
- mvwprintw(window,
- y, x,
- "%s", &line->text->text[offset]);
-
- } else {
-
- // IS_H1 || IS_H2
- if(CHECK_BIT(line->bits, IS_H1) || CHECK_BIT(line->bits, IS_H2)) {
-
- // set headline color
- if(colors)
- wattron(window, COLOR_PAIR(CP_BLUE));
-
- // enable underline for H1
- if(CHECK_BIT(line->bits, IS_H1))
- wattron(window, A_UNDERLINE);
-
- // skip hashes
- while(line->text->text[offset] == '#')
- offset = next_word(line->text, offset);
-
- // print whole lines
- mvwprintw(window,
- y, x,
- "%s", &line->text->text[offset]);
-
- wattroff(window, A_UNDERLINE);
-
- } else {
- // move the cursor in position
- wmove(window, y, x);
-
- // IS_QUOTE
- if(CHECK_BIT(line->bits, IS_QUOTE)) {
- while(line->text->text[offset] == '>') {
- // print a reverse color block
- if(colors) {
- wattron(window, COLOR_PAIR(CP_BLACK));
- wprintw(window, "%s", " ");
- wattron(window, COLOR_PAIR(CP_WHITE));
- wprintw(window, "%s", " ");
- } else {
- wprintw(window, "%s", ">");
- }
-
- // find next quote or break
- offset++;
- if(line->text->text[offset] == ' ')
- offset = next_word(line->text, offset);
- }
- }
-
- // for each char in line
- c = &line->text->text[offset];
- while(*c) {
-
- // if char is in special char list
- if(strchr(special, *c)) {
-
- // closing special char (or second backslash)
- if((stack->top)(stack, *c)) {
-
- switch(*c) {
- // print escaped backslash
- case '\\':
- wprintw(window, "%c", *c);
- break;
- // disable highlight
- case '*':
- if(colors)
- wattron(window, COLOR_PAIR(CP_WHITE));
- break;
- // disable underline
- case '_':
- wattroff(window, A_UNDERLINE);
- break;
- // disable inline code
- case '`':
- if(colors)
- wattron(window, COLOR_PAIR(CP_WHITE));
- break;
- }
-
- // remove top special char from stack
- (stack->pop)(stack);
-
- // treat special as regular char
- } else if((stack->top)(stack, '\\')) {
- wprintw(window, "%c", *c);
-
- // remove backslash from stack
- (stack->pop)(stack);
-
- // opening special char
- } else {
- switch(*c) {
- // enable highlight
- case '*':
- if(colors)
- wattron(window, COLOR_PAIR(CP_RED));
- break;
- // enable underline
- case '_':
- wattron(window, A_UNDERLINE);
- break;
- // enable inline code
- case '`':
- if(colors)
- wattron(window, COLOR_PAIR(CP_BLACK));
- break;
- // do nothing for backslashes
- }
-
- // push special char to stack
- (stack->push)(stack, *c);
- }
-
- } else {
- // remove backslash from stack
- if((stack->top)(stack, '\\'))
- (stack->pop)(stack);
-
- // print regular char
- wprintw(window, "%c", *c);
- }
-
- c++;
- }
-
- // pop stack until empty to prevent formated trailing spaces
- while(!(stack->empty)(stack)) {
- switch((stack->pop)(stack)) {
- // disable highlight
- case '*':
- if(colors)
- wattron(window, COLOR_PAIR(CP_WHITE));
- break;
- // disable underline
- case '_':
- wattroff(window, A_UNDERLINE);
- break;
- // disable inline code
- case '`':
- if(colors)
- wattron(window, COLOR_PAIR(CP_WHITE));
- break;
- // do nothing for backslashes
- }
- }
- }
- }
-
- // fill rest off line with spaces
- for(i = getcurx(window) - x; i < max_cols; i++)
- wprintw(window, "%s", " ");
-
- // reset to default color
- if(colors)
- wattron(window, COLOR_PAIR(CP_WHITE));
- wattroff(window, A_UNDERLINE);
- }
-
- (stack->delete)(stack);
-}
-
-void fade_out(WINDOW *window, int trans, int colors, int invert) {
- int i; // increment
- if(colors && COLORS == 256) {
- for(i = 22; i >= 0; i--) {
-
- // dim color pairs
- if(invert) {
- init_pair(CP_WHITE, white_ramp_invert[i], trans);
- init_pair(CP_BLUE, blue_ramp_invert[i], trans);
- init_pair(CP_RED, red_ramp_invert[i], trans);
- init_pair(CP_BLACK, 15, white_ramp_invert[i]);
- } else {
- init_pair(CP_WHITE, white_ramp[i], trans);
- init_pair(CP_BLUE, blue_ramp[i], trans);
- init_pair(CP_RED, red_ramp[i], trans);
- init_pair(CP_BLACK, 16, white_ramp[i]);
- }
-
- // refresh window with new color
- wrefresh(window);
-
- // delay for our eyes to recognize the change
- usleep(FADE_DELAY);
- }
- }
-}
-
-void fade_in(WINDOW *window, int trans, int colors, int invert) {
- int i; // increment
- if(colors && COLORS == 256) {
- for(i = 0; i <= 23; i++) {
-
- // brighten color pairs
- if(invert) {
- init_pair(CP_WHITE, white_ramp_invert[i], trans);
- init_pair(CP_BLUE, blue_ramp_invert[i], trans);
- init_pair(CP_RED, red_ramp_invert[i], trans);
- init_pair(CP_BLACK, 15, white_ramp_invert[i]);
- } else {
- init_pair(CP_WHITE, white_ramp[i], trans);
- init_pair(CP_BLUE, blue_ramp[i], trans);
- init_pair(CP_RED, red_ramp[i], trans);
- init_pair(CP_BLACK, 16, white_ramp[i]);
- }
-
- // refresh window with new color
- wrefresh(window);
-
- // delay for our eyes to recognize the change
- usleep(FADE_DELAY);
- }
- }
-}
-
-int int_length (int val) {
- int l = 1;
- while(val > 9) {
- l++;
- val /= 10;
- }
- return l;
-}
