helpers.rs
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helpers.rs
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	use anyhow::Error;
	use chrono::{DateTime, Utc};
	use macros_rs::str;
	use serde_derive::{Deserialize, Serialize};
	use std::path::Path;
	use std::sync::atomic::{AtomicUsize, Ordering};

	#[derive(Debug, Deserialize, Serialize)]
	pub struct Id {
	pub counter: AtomicUsize,
	}

	impl Id {
	pub fn new(start: usize) -> Self { Id { counter: AtomicUsize::new(start) } }
	pub fn next(&self) -> usize { self.counter.fetch_add(1, Ordering::SeqCst) }
	}

	pub struct Exists;
	impl Exists {
	pub fn folder(dir_name: String) -> Result<bool, Error> { Ok(Path::new(str!(dir_name)).is_dir()) }
	pub fn file(file_name: String) -> Result<bool, Error> { Ok(Path::new(str!(file_name)).exists()) }
	}

	pub fn format_duration(datetime: DateTime<Utc>) -> String {
	let current_time = Utc::now();
	let duration = current_time.signed_duration_since(datetime);

	match duration.num_seconds() {
	s if s >= 86400 => format!("{}d", s / 86400),
	s if s >= 3600 => format!("{}h", s / 3600),
	s if s >= 60 => format!("{}m", s / 60),
	s => format!("{}s", s),
	}
	}