initial commit
This commit is contained in:
Jakob Lechner
commit
3e9300f844
4 changed files with 395 additions and 0 deletions
1
.gitignore
vendored
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1
.gitignore
vendored
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@ -0,0 +1 @@
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/target
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300
Cargo.lock
generated
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300
Cargo.lock
generated
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@ -0,0 +1,300 @@
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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"wasm-bindgen-shared",
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]
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dependencies = [
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"windows_aarch64_msvc",
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"windows_i686_gnu",
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"windows_i686_gnullvm",
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"windows_i686_msvc",
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"windows_x86_64_gnu",
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"windows_x86_64_gnullvm",
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"windows_x86_64_msvc",
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]
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name = "windows_x86_64_gnullvm"
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name = "windows_x86_64_msvc"
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7
Cargo.toml
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7
Cargo.toml
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[package]
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name = "wait"
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version = "0.1.0"
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edition = "2021"
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[dependencies]
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chrono = "0.4"
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87
src/main.rs
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87
src/main.rs
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use chrono::prelude::*;
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use chrono::{LocalResult, NaiveTime, TimeDelta};
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use std::env;
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use std::process::Command;
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use std::thread::sleep;
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/// Handles `LocalResult` and extracts a valid `DateTime<Local>`.
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fn handle_local_result(result: LocalResult<DateTime<Local>>) -> DateTime<Local> {
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||||
match result {
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||||
LocalResult::Single(dt) => dt,
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LocalResult::Ambiguous(_, _) => {
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||||
eprintln!("Ambiguous local time encountered.");
|
||||
std::process::exit(1);
|
||||
}
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||||
LocalResult::None => {
|
||||
eprintln!("Invalid local time encountered.");
|
||||
std::process::exit(1);
|
||||
}
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||||
}
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||||
}
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||||
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||||
fn main() {
|
||||
// Collect command line arguments
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let args: Vec<String> = env::args().collect();
|
||||
if args.len() < 3 {
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||||
eprintln!("Usage: {} <HH:MM:SS.sss> <command> <args>", args[0]);
|
||||
std::process::exit(1);
|
||||
}
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||||
|
||||
let target_time_str = &args[1];
|
||||
let command = &args[2];
|
||||
let extra_args = &args[3 ..];
|
||||
|
||||
// Parse the time argument
|
||||
let target_time = match NaiveTime::parse_from_str(target_time_str, "%H:%M:%S%.f") {
|
||||
Ok(time) => time,
|
||||
Err(_) => {
|
||||
eprintln!("Invalid time format. Use HH:MM in 24-hour format.");
|
||||
std::process::exit(1);
|
||||
}
|
||||
};
|
||||
|
||||
// Get the current time and today's date
|
||||
let now = Local::now();
|
||||
let today = now.date_naive(); // Get today's naive date
|
||||
|
||||
// Calculate today's target time
|
||||
let today_target = handle_local_result(Local.from_local_datetime(&today.and_time(target_time)));
|
||||
|
||||
// Determine whether to use today's or tomorrow's target time
|
||||
let wait_until = if today_target > now {
|
||||
today_target // Target time is later today
|
||||
} else {
|
||||
// Calculate tomorrow's target time
|
||||
let tomorrow = today
|
||||
.succ_opt()
|
||||
.expect("Failed to calculate tomorrow's date");
|
||||
handle_local_result(Local.from_local_datetime(&tomorrow.and_time(target_time)))
|
||||
};
|
||||
|
||||
loop {
|
||||
let duration = wait_until - Local::now();
|
||||
let wait_time = duration.to_std().unwrap_or_else(|_| {
|
||||
eprintln!("Error calculating wait time.");
|
||||
std::process::exit(1);
|
||||
});
|
||||
|
||||
println!(
|
||||
"Waiting until {} ({:.3} seconds)...",
|
||||
wait_until, wait_time.as_secs_f32()
|
||||
);
|
||||
|
||||
if wait_time.as_secs() >= 1 {
|
||||
let sleep_seconds: i64 = if wait_time.subsec_millis() > 500 { 0 } else { 1 };
|
||||
sleep(TimeDelta::new(sleep_seconds, wait_time.subsec_nanos()).unwrap().to_std().unwrap());
|
||||
} else {
|
||||
sleep(wait_time);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// Time reached, run the command
|
||||
if let Err(e) = Command::new(command).args(extra_args).spawn() {
|
||||
eprintln!("Failed to launch command `{}`: {}", command, e);
|
||||
std::process::exit(1);
|
||||
}
|
||||
}
|
||||
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