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term_ui.c
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term_ui.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <sys/ioctl.h>
#include <curses.h>
#include <string.h>
#include <locale.h>
#include "term_ui.h"
#include "book.h"
#include "settings.h"
int book_page = 0;
int selection = 0;
bookid current_book = 0;
int last_input = 0;
State state = LIBRARY;
int ui_start ()
{
bool run = true;
setlocale(LC_ALL, "");
initscr();
noecho();
curs_set(0);
while (run)
{
if (LIBRARY == state)
{
list_titles();
}
if (BOOK == state)
{
display_book();
}
char i = getchar();
if (input(i) != 0)
{
run = false;
}
}
endwin();
return 0;
}
void clear_screen (const char *title_full)
{
int w, h;
getmaxyx(stdscr, h, w);
clear();
const char app[7] = "ereader";
// TODO truncate length depending on width of terminal
char *title = malloc(20 * sizeof(char));
strncpy(title, title_full, 20);
int title_len = 20;
const char version[3] = "0.1";
char *top = malloc(w * sizeof(char));
// no border for now
char border = (char)' ';
// top bar
for (int x = 0; x < w; x ++)
{
top[x] = border;
}
strncpy(top + 1, app, 7);
strncpy(top + w / 2 - title_len / 2, title, title_len);
strncpy(top + w - 5, version, 3);
for (int x = 0; x < w; x ++)
{
mvaddch(0, x, top[x]);
mvaddch(h - 1, x, border);
}
free(top);
for (int y = 0; y < h; y ++)
{
mvaddch(y, 0, border);
mvaddch(y, w - 1, border);
}
move(1, 1);
refresh();
}
int input (char i)
{
last_input = i;
switch (i)
{
// up arrow
case 65:
case 'k':
scroll_up();
break;
// down arrow
case 66:
case 'j':
scroll_down();
break;
// left arrow
case 61:
break;
// right arrow
case 63:
break;
// page up
case 'K':
page_up();
break;
// page down
case 'J':
page_down();
break;
// enter
case 13:
select_title();
break;
case 'q':
return 1;
break;
default:
break;
}
return 0;
}
int list_titles ()
{
clear_screen("Library");
int num_books = get_num_books();
int w, h, max_lines, page_offset;
getmaxyx(stdscr, h, w);
max_lines = h - padding_y * 2;
page_offset = selection / max_lines;
for (int i = 0; i < num_books && i < max_lines; i ++)
{
int book_id = i + page_offset * max_lines;
const char *title = book_title(book_id);
if (NULL == title)
{
continue;
}
char selected = ' ';
if (selection == book_id)
{
selected = 'X';
}
int max = w - 20;
char *title_trunc = malloc(max * sizeof(char));
strncpy(title_trunc, title, max);
title_trunc[max - 1] = '\0';
mvprintw(i + 1, 1, "%c %d: %s", selected, book_id + 1, title_trunc);
free(title_trunc);
}
// show input in bottom left
char str[10];
sprintf(str, "%d", last_input);
getmaxyx(stdscr, h, w);
mvprintw(h - 1, 1, str);
refresh();
return 0;
}
int display_book ()
{
const char *text = NULL;
const char *title = get_title(current_book);
int w;
int h;
int w2;
int h2;
clear_screen(title);
getmaxyx(stdscr, h, w);
w2 = w - 2 - padding_x * 2;
h2 = h - 2 - padding_y * 2;
text = get_body(current_book) + book_page * 500;
if (text == NULL)
{
printf("can't display book\n");
return 1;
}
int x = 0;
int y = 0;
int len = h2 * w2;
for (int i = 0; i < len; i ++)
{
char c = text[i];
if (c == '\n')
{
y ++;
x = 0;
continue;
}
// ascii
if ((unsigned char)c < 128)
{
mvaddch(1 + padding_y + y, 1 + padding_x + x, c);
// unicode
} else if ((unsigned char)c < 224)
{
mvprintw(1 + padding_y + y, 1 + padding_x + x, "%.*s", 2, text + i);
i ++;
} else if ((unsigned char)c < 240)
{
mvprintw(1 + padding_y + y, 1 + padding_x + x, "%.*s", 3, text + i);
i += 2;
} else
{
mvprintw(1 + padding_y + y, 1 + padding_x + x, "%.*s", 4, text + i);
i += 3;
}
x ++;
if (x == w2)
{
x = 0;
y ++;
}
if (y >= h2)
{
break;
}
}
refresh();
return 0;
}
void scroll_up ()
{
if (state == LIBRARY)
{
change_selection(-1);
}
if (state == BOOK)
{
book_page --;
if (book_page < 0)
{
book_page = 0;
}
}
}
void scroll_down ()
{
if (state == LIBRARY)
{
change_selection(1);
}
if (state == BOOK)
{
book_page ++;
}
}
void page_up ()
{
if (state == BOOK)
{
}
if (state == LIBRARY)
{
change_selection(-10);
}
}
void page_down ()
{
if (state == BOOK)
{
}
if (state == LIBRARY)
{
change_selection(10);
}
}
void
change_selection (int amount)
{
selection += amount;
if (selection < 0)
{
selection = get_num_books() - 1;
}
if (selection >= get_num_books())
{
selection = 0;
}
}
void select_title ()
{
if (LIBRARY == state)
{
current_book = selection;
state = BOOK;
}
}
void quit ()
{
}