X-Git-Url: https://git.danieliu.xyz/?a=blobdiff_plain;f=viewer.c;h=ffe1c970bc3f7c1da6059dee503470f329fa09d5;hb=ebef3b3f1031622ad04c4ba10c3aff8cf4f2ef08;hp=8e5e74172d19f62e3a0761ced84d912d04502178;hpb=f4e453fa3619de52dce9d98c5ad1441982c46539;p=smdp.git
diff --git a/viewer.c b/viewer.c
index 8e5e741..ffe1c97 100644
--- a/viewer.c
+++ b/viewer.c
@@ -1,22 +1,67 @@
+/*
+ * 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 mpd.
+ *
+ * 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 .
+ *
+ */
+
+#include // setlocale
#include
#include
+#include // strchr
+#include
-#include "include/parser.h"
#include "include/viewer.h"
+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, 32,
+ 33, 38, 39, 44, 45, 45,
+ 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 };
+
int ncurses_display(deck_t *deck, int notrans, int nofade) {
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 and 3 are displayed at the bottom
- int bar_bottom = (deck->headers > 1) ? 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;
@@ -33,20 +78,27 @@ int ncurses_display(deck_t *deck, int notrans, int nofade) {
slide = slide->next;
}
+ // set locale to display UTF-8 correctly in ncurses
+ setlocale(LC_CTYPE, "");
+
+ // replace stdin with current tty if markdown input was piped
+ freopen("/dev/tty", "rw", stdin);
+
+ // init ncurses
+ initscr();
+
if((max_cols > COLS) ||
(max_lines + bar_top + bar_bottom + 2 > LINES)) {
fprintf(stderr, "Error: Terminal size %ix%i to small. Need at least %ix%i.\n",
COLS, LINES, max_cols, max_lines + bar_top + bar_bottom + 2);
+ endwin();
return(1);
}
// replace stdin with current tty if markdown input was piped
freopen("/dev/tty", "rw", stdin);
- // init ncurses
- initscr();
-
// disable cursor
curs_set(0);
@@ -64,7 +116,7 @@ int ncurses_display(deck_t *deck, int notrans, int nofade) {
start_color();
use_default_colors();
- if(!notrans) trans = 0; // 0 is black
+ if(notrans) trans = 0; // 0 is black
if(COLORS == 256) {
// 256 color mode
@@ -91,65 +143,160 @@ int ncurses_display(deck_t *deck, int notrans, int nofade) {
if(colors)
wbkgd(stdscr, COLOR_PAIR(CP_YELLOW));
- // setup header
- if(bar_top) {
- //TODO move cursor to calculated indentation
- wmove(stdscr, 0, 1);
- //TODO add text to header
- wprintw(stdscr, "header");
- }
-
- // setup footer
- if(bar_bottom) {
- //TODO move cursor to calculated indentation
- wmove(stdscr, LINES - 1, 1);
- //TODO add text to footer
- wprintw(stdscr, "footer");
- }
-
// setup main window
- WINDOW *content = newwin(LINES - bar_top - bar_bottom, COLS, 0, 0 + bar_top);
+ 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) {
- // fade out
- // print header / footer
+ // clear windows
+ werase(content);
+ werase(stdscr);
+
+ // 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
+ 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);
+ line = line->next;
+ l++;
+ }
+
+ // make content visible
+ wrefresh(content);
+
// fade in
+ if(fade)
+ fade_in(content, trans, colors);
+
+ // 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 KEY_BACKSPACE:
+ case 8: // BACKSPACE (ascii)
+ case 127: // BACKSPACE (xterm)
+ case 263: // BACKSPACE (getty)
case 'h':
case 'k':
- if(slide->prev)
+ if(slide->prev) {
slide = slide->prev;
+ sc--;
+ }
break;
// show next slide
case KEY_DOWN:
case KEY_RIGHT:
- case KEY_ENTER:
+ case '\n': // ENTER
+ case ' ': // SPACE
case 'j':
case 'l':
- if(slide->next)
+ if(slide->next) {
slide = slide->next;
+ sc++;
+ }
+ 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);
}
endwin();
@@ -157,3 +304,202 @@ int ncurses_display(deck_t *deck, int notrans, int nofade) {
return(0);
}
+void add_line(WINDOW *window, int y, int x, line_t *line, int max_cols) {
+ 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
+ offset = next_nonblank(line->text, 0);
+
+ // IS_CODE
+ if(CHECK_BIT(line->bits, IS_CODE)) {
+
+ // set static offset for code
+ offset = CODE_INDENT;
+
+ // reverse color for code blocks
+ wattron(window, A_REVERSE);
+
+ // 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
+ 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
+ wattron(window, A_REVERSE);
+ wprintw(window, "%s", " ");
+ wattroff(window, A_REVERSE);
+ 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 '*':
+ wattron(window, COLOR_PAIR(CP_WHITE));
+ break;
+ // disable underline
+ case '_':
+ wattroff(window, A_UNDERLINE);
+ 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 '*':
+ wattron(window, COLOR_PAIR(CP_RED));
+ break;
+ // enable underline
+ case '_':
+ wattron(window, A_UNDERLINE);
+ break;
+ // do nothing for backslashes
+ }
+
+ // push special char to stack
+ (stack->push)(stack, *c);
+ }
+
+ } else {
+ // 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)) {
+ case '\\':
+ wprintw(window, "%c", '\\');
+ break;
+ // disable highlight
+ case '*':
+ wattron(window, COLOR_PAIR(CP_WHITE));
+ break;
+ // disable underline
+ case '_':
+ wattroff(window, A_UNDERLINE);
+ break;
+ }
+ }
+ }
+ }
+
+ // fill rest off line with spaces
+ for(i = getcurx(window) - x; i < max_cols; i++)
+ wprintw(window, "%s", " ");
+
+ // reset to default color
+ wattron(window, COLOR_PAIR(CP_WHITE));
+ wattroff(window, A_UNDERLINE);
+ wattroff(window, A_REVERSE);
+ }
+
+ (stack->delete)(stack);
+}
+
+void fade_out(WINDOW *window, int trans, int colors) {
+ int i; // increment
+ if(colors) {
+ for(i = 22; i >= 0; i--) {
+ // darken color pairs
+ init_pair(CP_WHITE, white_ramp[i], trans);
+ init_pair(CP_BLUE, blue_ramp[i], trans);
+ init_pair(CP_RED, red_ramp[i], trans);
+ // 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 i; // increment
+ if(colors) {
+ for(i = 0; i <= 23; i++) {
+ // lighten color pairs
+ init_pair(CP_WHITE, white_ramp[i], trans);
+ init_pair(CP_BLUE, blue_ramp[i], trans);
+ init_pair(CP_RED, red_ramp[i], trans);
+ // 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;
+}