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use fmt;
use ev;
use getopt;
use os;
use time;
use strings;
use strconv;
use math;
type parseerror = !void;
fn timer_handler(file: *ev::file) void = {
const loop = ev::getloop(file);
const t = ev::getuser(file): *time::instant;
const t = *t;
if (print_countdown(t)) {
ev::stop(loop);
};
};
fn print_countdown(instant: time::instant) bool = {
const tn = time::now(time::clock::MONOTONIC);
const currentduration = time::diff(tn, instant);
// man page console_codes(4) is useful
fmt::error("\x1B[1K\r")!;
const count = human_readable(currentduration);
defer free(count);
fmt::error(count)!;
return currentduration <= 0;
};
// Transform a duration to a human readable string representation.
fn human_readable(duration: time::duration) str = {
const hours = if (duration > time::HOUR) {
let hours = math::floorf64(duration: f64 / time::HOUR: f64): u64;
duration = (duration % time::HOUR);
yield hours;
} else {
yield 0u64;
};
const mins = if (duration > time::MINUTE) {
let mins = math::floorf64(duration: f64 / time::MINUTE: f64): u64;
duration = (duration % time::MINUTE);
yield mins;
} else {
yield 0u64;
};
const secs = if (duration > time::SECOND) {
yield math::floorf64(duration: f64 / time::SECOND: f64): u64;
} else {
yield 0u64;
};
const mods = &fmt::mods {
pad = '0',
width = 2,
...
};
return fmt::asprintf("{%}:{%}:{%}", hours, mods, mins, mods, secs, mods)!;
};
fn parse_duration(duration: const str) (time::duration | parseerror | strconv::invalid | strconv::overflow) = {
const spl = strings::split(duration, ":")!;
defer free(spl);
if (len(spl) >= 4 || len(spl) < 1) {
return parseerror;
};
const hours = if (len(spl) == 3) {
yield strconv::stoi(spl[0])?;
} else {
yield 0;
};
const mins = if (len(spl) >= 2) {
yield strconv::stoi(spl[len(spl)-2])?;
} else {
yield 0;
};
const secs = strconv::stoi(spl[len(spl)-1])?;
const hours = hours * time::HOUR;
const mins = mins * time::MINUTE;
const secs = secs * time::SECOND;
return hours + mins + secs;
};
fn parse_duration_hms(duration: const str) (time::duration | parseerror | strconv::invalid | strconv::overflow) = {
let start = 0z;
const hours = match (strings::index(duration, 'h')) {
case let i: size =>
const s = strconv::stoi(strings::sub(duration, start, i))!;
start = i + 1;
yield s;
case void =>
yield 0;
};
const mins = match (strings::index(duration, 'm')) {
case let i: size =>
const s = strconv::stoi(strings::sub(duration, start, i))!;
start = i + 1;
yield s;
case void =>
yield 0;
};
const secs = match (strings::index(duration, 's')) {
case let i: size =>
fmt::error(start)!;
yield strconv::stoi(strings::sub(duration, start, i))!;
case void =>
yield 0;
};
const hours = hours * time::HOUR;
const mins = mins * time::MINUTE;
const secs = secs * time::SECOND;
return hours + mins + secs;
};
export fn main() void = {
const cmd = getopt::parse(os::args,
"cli timer with a countdown",
"duration",
);
defer getopt::finish(&cmd);
if (len(cmd.args) != 1) {
getopt::printusage(os::stderr, os::args[0], cmd.help)!;
os::exit(os::status::FAILURE);
};
const duration = cmd.args[0];
const f = if (strings::contains(duration, ':')) {
yield &parse_duration;
} else {
yield &parse_duration_hms;
};
const duration = match (f(duration)) {
case let d: time::duration =>
yield d;
case parseerror =>
fmt::fatal("Error parsing the given duration");
case let e: strconv::invalid =>
fmt::fatal(strconv::strerror(e));
case let e: strconv::overflow =>
fmt::fatal(strconv::strerror(e));
};
const loop = ev::newloop()!;
const t = time::now(time::clock::MONOTONIC);
const t = time::add(t, duration);
defer ev::finish(&loop);
const f = ev::newtimer(&loop, &timer_handler, time::clock::MONOTONIC)!;
ev::setuser(f, &t);
print_countdown(t);
ev::timer_configure(f, 1 * time::SECOND, 1 * time::SECOND);
for (ev::dispatch(&loop, -1)!) void;
fmt::errorln()!;
};
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