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|
use fmt;
use tb = termbox2;
def bg = tb::COLOR.DEFAULT;
def fg = tb::COLOR.DEFAULT | tb::ATTRIBUTE.BOLD;
def exit_help: str = "Use :q to exit (colon, q, enter). Sad to see you go :(";
let wpos: (int, int) = (-1, -1);
let msg: str = "Use HJKL to move the widget around";
let colon_mode: bool = false;
let exit_attempts: size = 0;
type cmd = enum {
UP,
DOWN,
LEFT,
RIGHT,
COLON,
ARROW,
Q,
ENTER,
EXIT_ATTEMPT,
NONE,
};
fn draw_small_widget_thing(w: size, h: size) void = {
if (wpos.0 < 4) wpos.0 += 1
else if (wpos.0 > w: int - 5) wpos.0 -= 1
else if (wpos.1 < 2) wpos.1 += 1
else if (wpos.1 > h: int - 3) wpos.1 -= 1;
tb::print(wpos.0, wpos.1 - 1, fg, bg, "K")!;
tb::print(wpos.0, wpos.1 + 1, fg, bg, "J")!;
tb::print(wpos.0 - 2, wpos.1, fg, bg, "H + L")!;
};
fn paint(x: int, y: int, c: tb::uattr) void =
tb::set_cell(x, y, ' ', tb::COLOR.DEFAULT, c)!;
fn paint_col3(x: int, y: int, c: tb::uattr) void = {
paint(x, y-1, c);
paint(x, y, c);
paint(x, y+1, c);
};
fn paint_row5(x: int, y: int, c: tb::uattr) void = {
paint(x-2, y, c);
paint(x-1, y, c);
paint(x, y, c);
paint(x+1, y, c);
paint(x+2, y, c);
};
fn paint_cell(x: int, y: int, c: tb::uattr, s: str) void = {
paint_col3(x-2, y, c);
paint_row5(x, y-1, c);
tb::print(x, y, fg, bg, s)!;
paint_row5(x, y+1, c);
paint_col3(x+2, y, c);
};
fn draw_large_widget_thing(w: size, h: size) void = {
if (wpos.0 < 10) wpos.0 += 1
else if (wpos.0 > w: int - 11) wpos.0 -= 1
else if (wpos.1 < 7) wpos.1 += 1
else if (wpos.1 > h: int - 8) wpos.1 -= 1;
let c = tb::COLOR.BLUE;
paint_cell(wpos.0-6, wpos.1, c, "H");
paint_cell(wpos.0+6, wpos.1, c, "L");
paint_cell(wpos.0, wpos.1-4, c, "K");
paint_cell(wpos.0, wpos.1+4, c, "J");
paint_col3(wpos.0, wpos.1, c);
paint_row5(wpos.0, wpos.1, c);
};
fn draw_widget_thing(w: size, h: size) void = {
if (w < 30 || h < 15)
draw_small_widget_thing(w, h)
else
draw_large_widget_thing(w, h);
};
fn draw_bottom_bar(w: size, h: size) void = {
tb::print(0, h: int - 1, fg, bg, msg)!;
};
fn handle_events_and_exit() bool = {
let e = tb::poll_event();
if (e is tb::err)
return false;
return match (e as tb::event) {
case tb::resize_event => yield false;
case tb::mouse_event => yield {
msg = "A mouse? Are you serious?";
yield false;
};
case let ke: tb::key_event => yield handle_key_event_and_exit(ke);
};
};
fn is_arrow(k: tb::key) bool =
k == tb::KEY.ARROW_UP || k == tb::KEY.ARROW_DOWN ||
k == tb::KEY.ARROW_LEFT || k == tb::KEY.ARROW_RIGHT;
fn is_exit_attempt(k: tb::key) bool =
k == tb::KEY.CTRL_Q || k == tb::KEY.CTRL_C || k == tb::KEY.CTRL_X ||
k == tb::KEY.CTRL_Z || k == tb::KEY.CTRL_D ||
k == tb::KEY.DELETE || k == tb::KEY.BACKSPACE || k == tb::KEY.ESC;
fn get_cmd(ke: tb::key_event) cmd = match (ke.key_or_ch) {
case let r: rune => yield
if (r == 'h') cmd::LEFT
else if (r == 'j') cmd::DOWN
else if (r == 'k') cmd::UP
else if (r == 'l') cmd::RIGHT
else if (r == ':') cmd::COLON
else if (r == 'q') cmd::Q
else if (r == 'Q') cmd::EXIT_ATTEMPT
else cmd::NONE;
case let k: tb::key => yield
if (k == tb::KEY.ENTER) cmd::ENTER
else if (is_arrow(k)) cmd::ARROW
else if (is_exit_attempt(k)) cmd::EXIT_ATTEMPT
else cmd::NONE;
};
fn exit_attempt() void = {
exit_attempts += 1;
msg = if (exit_attempts < 3) "Trying to get out? :3"
else if (exit_attempts < 6) "It's just like Vim!"
else if (exit_attempts < 8) "Uhm no, that won't work"
else if (exit_attempts < 10) "Ok, I'll tell you..."
else exit_help;
};
fn handle_key_event_and_exit(ke: tb::key_event) bool = {
let c = get_cmd(ke);
if (c == cmd::COLON)
colon_mode = true;
if (colon_mode) {
if (msg == ":q" && c == cmd::ENTER)
return true;
msg = if (msg == ":") {
yield if (c == cmd::Q) ":q" else exit_help;
} else if (c == cmd::COLON) ":" else exit_help;
return false;
};
switch (c) {
case cmd::UP => wpos.1 -= 1;
case cmd::DOWN => wpos.1 += 1;
case cmd::LEFT => wpos.0 -= 1;
case cmd::RIGHT => wpos.0 += 1;
case cmd::ARROW => msg = "No arrows allowed!";
case cmd::COLON => colon_mode = true;
case cmd::EXIT_ATTEMPT => exit_attempt();
case cmd::Q => exit_attempt();
case => yield;
};
return false;
};
export fn main() void = {
let e = tb::init();
if (e is tb::err)
fmt::fatalf(tb::strerror(e as tb::err));
defer tb::shutdown()!;
wpos = (tb::width()!: int / 2, tb::height()!: int / 2);
for (true) {
tb::clear()!;
let w = tb::width()!;
let h = tb::height()!;
draw_widget_thing(w, h);
draw_bottom_bar(w, h);
tb::present()!;
if (handle_events_and_exit()) break;
};
return;
};
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