commit 3e9300f844eafc6d80efd59ab685d96c0db1f546
Author: Jakob Lechner <mail@jalr.de>
Date:   Wed Nov 20 22:28:49 2024 +0100

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..47af264
--- /dev/null
+++ b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..fb50e84
--- /dev/null
+++ b/Cargo.toml
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+edition = "2021"
+
+[dependencies]
+chrono = "0.4"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d145e97
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,87 @@
+use chrono::prelude::*;
+use chrono::{LocalResult, NaiveTime, TimeDelta};
+use std::env;
+use std::process::Command;
+use std::thread::sleep;
+
+/// Handles `LocalResult` and extracts a valid `DateTime<Local>`.
+fn handle_local_result(result: LocalResult<DateTime<Local>>) -> DateTime<Local> {
+    match result {
+        LocalResult::Single(dt) => dt,
+        LocalResult::Ambiguous(_, _) => {
+            eprintln!("Ambiguous local time encountered.");
+            std::process::exit(1);
+        }
+        LocalResult::None => {
+            eprintln!("Invalid local time encountered.");
+            std::process::exit(1);
+        }
+    }
+}
+
+fn main() {
+    // Collect command line arguments
+    let args: Vec<String> = env::args().collect();
+    if args.len() < 3 {
+        eprintln!("Usage: {} <HH:MM:SS.sss> <command> <args>", args[0]);
+        std::process::exit(1);
+    }
+
+    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);
+    }
+}