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/* Copyright (C) 2018 June McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _XOPEN_SOURCE_EXTENDED
#include <curses.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <poll.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sysexits.h>
#include <unistd.h>
#include <wchar.h>
#include "torus.h"
#define err(...) do { endwin(); err(__VA_ARGS__); } while(0)
#define errx(...) do { endwin(); errx(__VA_ARGS__); } while (0)
#define CTRL(ch) ((ch) ^ 0x40)
enum {
ESC = 0x1B,
DEL = 0x7F,
};
static void curse(void) {
setlocale(LC_CTYPE, "");
initscr();
start_color();
if (!has_colors() || COLOR_PAIRS < 64) {
endwin();
fprintf(stderr, "Sorry, your terminal doesn't support colors!\n");
fprintf(stderr, "If you think it should, check TERM.\n");
exit(EX_CONFIG);
}
if (LINES < CELL_ROWS || COLS < CELL_COLS) {
endwin();
fprintf(
stderr,
"Sorry, your terminal is too small!\n"
"It must be at least %ux%u characters.\n",
CELL_COLS, CELL_ROWS
);
exit(EX_CONFIG);
}
assume_default_colors(0, 0);
if (COLORS >= 16) {
for (short pair = 1; pair < 0x80; ++pair) {
init_pair(pair, pair & 0x0F, (pair & 0xF0) >> 4);
}
} else {
for (short pair = 1; pair < 0100; ++pair) {
init_pair(pair, pair & 007, (pair & 070) >> 3);
}
}
color_set(COLOR_WHITE, NULL);
bool hline = (LINES > CELL_ROWS);
bool vline = (COLS > CELL_COLS);
if (hline) mvhline(CELL_ROWS, 0, 0, CELL_COLS);
if (vline) mvvline(0, CELL_COLS, 0, CELL_ROWS);
if (hline && vline) mvaddch(CELL_ROWS, CELL_COLS, ACS_LRCORNER);
color_set(0, NULL);
cbreak();
noecho();
keypad(stdscr, true);
set_escdelay(100);
}
static attr_t colorAttr(uint8_t color) {
if (COLORS >= 16) return A_NORMAL;
return (color & COLOR_BRIGHT) ? A_BOLD : A_NORMAL;
}
static short colorPair(uint8_t color) {
if (COLORS >= 16) return color;
return (color & 0x70) >> 1 | (color & 0x07);
}
static uint8_t cellX;
static uint8_t cellY;
static struct Tile tile;
static void tileDraw(uint8_t cellX, uint8_t cellY, attr_t attr) {
uint8_t color = tile.colors[cellY][cellX];
uint8_t cell = tile.cells[cellY][cellX];
cchar_t cch;
wchar_t wch[] = { CP437[cell], L'\0' };
setcchar(&cch, wch, attr | colorAttr(color), colorPair(color), NULL);
mvadd_wch(cellY, cellX, &cch);
}
static int client;
static void serverTile(void) {
ssize_t size = recv(client, &tile, sizeof(tile), 0);
if (size < 0) err(EX_IOERR, "recv");
if ((size_t)size < sizeof(tile)) errx(EX_PROTOCOL, "truncated tile");
for (uint8_t cellY = 0; cellY < CELL_ROWS; ++cellY) {
for (uint8_t cellX = 0; cellX < CELL_COLS; ++cellX) {
tileDraw(cellX, cellY, A_NORMAL);
}
}
}
static void serverMove(struct ServerMessage msg) {
cellX = msg.move.cellX;
cellY = msg.move.cellY;
}
static void serverPut(struct ServerMessage msg) {
tile.colors[msg.put.cellY][msg.put.cellX] = msg.put.color;
tile.cells[msg.put.cellY][msg.put.cellX] = msg.put.cell;
tileDraw(msg.put.cellX, msg.put.cellY, A_NORMAL);
}
static void serverCursor(struct ServerMessage msg) {
if (msg.cursor.oldCellX != CURSOR_NONE) {
tileDraw(msg.cursor.oldCellX, msg.cursor.oldCellY, A_NORMAL);
}
if (msg.cursor.newCellX != CURSOR_NONE) {
tileDraw(msg.cursor.newCellX, msg.cursor.newCellY, A_REVERSE);
}
}
static void serverMap(void) {
}
static void readMessage(void) {
struct ServerMessage msg;
ssize_t size = recv(client, &msg, sizeof(msg), 0);
if (size < 0) err(EX_IOERR, "recv");
if ((size_t)size < sizeof(msg)) errx(EX_PROTOCOL, "truncated message");
switch (msg.type) {
break; case SERVER_TILE: serverTile();
break; case SERVER_MOVE: serverMove(msg);
break; case SERVER_PUT: serverPut(msg);
break; case SERVER_CURSOR: serverCursor(msg);
break; case SERVER_MAP: serverMap();
break; default: errx(EX_PROTOCOL, "unknown message type %d", msg.type);
}
move(cellY, cellX);
}
static void clientMessage(struct ClientMessage msg) {
ssize_t size = send(client, &msg, sizeof(msg), 0);
if (size < 0) err(EX_IOERR, "send");
}
static void clientMove(int8_t dx, int8_t dy) {
struct ClientMessage msg = {
.type = CLIENT_MOVE,
.move = { .dx = dx, .dy = dy },
};
clientMessage(msg);
}
static void clientPut(uint8_t color, uint8_t cell) {
struct ClientMessage msg = {
.type = CLIENT_PUT,
.put = { .color = color, .cell = cell },
};
clientMessage(msg);
}
static void clientMap(void) {
struct ClientMessage msg = { .type = CLIENT_MAP };
clientMessage(msg);
}
static struct {
enum {
MODE_NORMAL,
MODE_INSERT,
MODE_REPLACE,
MODE_DRAW,
} mode;
uint8_t color;
uint8_t shift;
uint8_t draw;
} input = {
.color = COLOR_WHITE,
};
static struct {
int8_t dx;
int8_t dy;
uint8_t len;
} insert;
static void insertMode(int8_t dx, int8_t dy) {
input.mode = MODE_INSERT;
insert.dx = dx;
insert.dy = dy;
insert.len = 0;
}
static void inputFg(uint8_t fg) {
input.color = (input.color & 0x78) | (fg & 0x07);
}
static void inputBg(uint8_t bg) {
input.color = (input.color & 0x0F) | (bg & 0x07) << 4;
}
static void inputInvert(void) {
input.color = (input.color & 0x08)
| (input.color & 0x70) >> 4
| (input.color & 0x07) << 4;
}
static void inputSwap(int8_t dx, int8_t dy) {
if ((uint8_t)(cellX + dx) >= CELL_COLS) return;
if ((uint8_t)(cellY + dy) >= CELL_ROWS) return;
uint8_t aColor = tile.colors[cellY][cellX];
uint8_t aCell = tile.cells[cellY][cellX];
uint8_t bColor = tile.colors[cellY + dy][cellX + dx];
uint8_t bCell = tile.cells[cellY + dy][cellX + dx];
clientPut(bColor, bCell);
clientMove(dx, dy);
clientPut(aColor, aCell);
}
static uint8_t inputCell(wchar_t ch) {
if (ch < 0x80) return (uint8_t)ch + input.shift;
for (size_t i = 0; i < ARRAY_LEN(CP437); ++i) {
if (ch == CP437[i]) return i;
}
return 0;
}
static void inputKeyCode(wchar_t ch) {
switch (ch) {
break; case KEY_LEFT: clientMove(-1, 0);
break; case KEY_RIGHT: clientMove( 1, 0);
break; case KEY_UP: clientMove( 0, -1);
break; case KEY_DOWN: clientMove( 0, 1);
break; case KEY_F(1): input.shift = 0x00;
break; case KEY_F(2): input.shift = 0xC0;
break; case KEY_F(3): input.shift = 0xA0;
break; case KEY_F(4): input.shift = 0x70;
break; case KEY_F(5): input.shift = 0x40;
}
}
static void inputNormal(wchar_t ch) {
switch (ch) {
break; case ESC: input.mode = MODE_NORMAL; input.shift = 0;
break; case 'q': endwin(); exit(EX_OK);
break; case 'h': clientMove(-1, 0);
break; case 'l': clientMove( 1, 0);
break; case 'k': clientMove( 0, -1);
break; case 'j': clientMove( 0, 1);
break; case 'y': clientMove(-1, -1);
break; case 'u': clientMove( 1, -1);
break; case 'b': clientMove(-1, 1);
break; case 'n': clientMove( 1, 1);
break; case '0': inputFg(COLOR_BLACK);
break; case '1': inputFg(COLOR_RED);
break; case '2': inputFg(COLOR_GREEN);
break; case '3': inputFg(COLOR_YELLOW);
break; case '4': inputFg(COLOR_BLUE);
break; case '5': inputFg(COLOR_MAGENTA);
break; case '6': inputFg(COLOR_CYAN);
break; case '7': inputFg(COLOR_WHITE);
break; case ')': inputBg(COLOR_BLACK);
break; case '!': inputBg(COLOR_RED);
break; case '@': inputBg(COLOR_GREEN);
break; case '#': inputBg(COLOR_YELLOW);
break; case '$': inputBg(COLOR_BLUE);
break; case '%': inputBg(COLOR_MAGENTA);
break; case '^': inputBg(COLOR_CYAN);
break; case '&': inputBg(COLOR_WHITE);
break; case '8': case '*': input.color ^= COLOR_BRIGHT;
break; case '9': case '(': inputInvert();
break; case '`': input.color = tile.colors[cellY][cellX];
break; case 'H': inputSwap(-1, 0);
break; case 'L': inputSwap( 1, 0);
break; case 'K': inputSwap( 0, -1);
break; case 'J': inputSwap( 0, 1);
break; case 'Y': inputSwap(-1, -1);
break; case 'U': inputSwap( 1, -1);
break; case 'B': inputSwap(-1, 1);
break; case 'N': inputSwap( 1, 1);
break; case 'x': clientPut(tile.colors[cellY][cellX], ' ');
break; case '~': {
clientPut(input.color, tile.cells[cellY][cellX]);
clientMove(1, 0);
}
break; case CTRL('A'): {
clientPut(tile.colors[cellY][cellX], tile.cells[cellY][cellX] + 1);
}
break; case CTRL('X'): {
clientPut(tile.colors[cellY][cellX], tile.cells[cellY][cellX] - 1);
}
break; case 'i': insertMode(1, 0);
break; case 'a': clientMove(1, 0); insertMode(1, 0);
break; case 'r': input.mode = MODE_REPLACE;
break; case 'R': input.mode = MODE_DRAW; input.draw = 0;
}
}
static void inputInsert(wchar_t ch) {
switch (ch) {
break; case ESC: {
input.mode = MODE_NORMAL;
clientMove(-insert.dx, -insert.dy);
}
break; case '\b': case DEL: {
clientMove(-insert.dx, -insert.dy);
clientPut(input.color, ' ');
insert.len--;
}
break; case '\n': {
clientMove(insert.dy, insert.dx);
clientMove(insert.len * -insert.dx, insert.len * -insert.dy);
insert.len = 0;
}
break; default: {
uint8_t cell = inputCell(ch);
if (!cell) break;
clientPut(input.color, cell);
clientMove(insert.dx, insert.dy);
insert.len++;
}
}
}
static void inputReplace(wchar_t ch) {
if (ch != ESC) {
uint8_t cell = inputCell(ch);
if (!cell) return;
clientPut(tile.colors[cellY][cellX], cell);
}
input.mode = MODE_NORMAL;
}
static void inputDraw(wchar_t ch) {
if (ch == ESC) {
input.mode = MODE_NORMAL;
return;
}
if (input.draw) {
inputNormal(ch);
} else {
input.draw = inputCell(ch);
}
clientPut(input.color, input.draw);
}
static void readInput(void) {
wint_t ch;
if (KEY_CODE_YES == get_wch(&ch)) {
inputKeyCode(ch);
return;
}
switch (input.mode) {
break; case MODE_NORMAL: inputNormal(ch);
break; case MODE_INSERT: inputInsert(ch);
break; case MODE_REPLACE: inputReplace(ch);
break; case MODE_DRAW: inputDraw(ch);
}
}
int main() {
client = socket(PF_LOCAL, SOCK_STREAM, 0);
if (client < 0) err(EX_OSERR, "socket");
struct sockaddr_un addr = {
.sun_family = AF_LOCAL,
.sun_path = "torus.sock",
};
int error = connect(client, (struct sockaddr *)&addr, sizeof(addr));
if (error) err(EX_NOINPUT, "torus.sock");
curse();
struct pollfd fds[2] = {
{ .fd = STDIN_FILENO, .events = POLLIN },
{ .fd = client, .events = POLLIN },
};
for (;;) {
int nfds = poll(fds, 2, -1);
if (nfds < 0 && errno == EINTR) continue;
if (nfds < 0) err(EX_IOERR, "poll");
if (fds[0].revents) readInput();
if (fds[1].revents) readMessage();
refresh();
}
}
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