rust-fatfs/examples/ls.rs

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extern crate fatfs;
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extern crate chrono;
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use std::env;
use std::fs::File;
use std::io;
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use chrono::{DateTime, Local};
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use fatfs::{FileSystem, FsOptions, BufStream};
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fn format_file_size(size: u64) -> String {
const KB: u64 = 1024;
const MB: u64 = 1024*KB;
const GB: u64 = 1024*MB;
if size < 1024 {
format!("{}B", size)
} else if size < MB {
format!("{}KB", size / KB)
} else if size < GB {
format!("{}KB", size / MB)
} else {
format!("{}KB", size / GB)
}
}
fn main() -> io::Result<()> {
let file = File::open("resources/fat32.img")?;
let mut buf_rdr = BufStream::new(file);
let fs = FileSystem::new(&mut buf_rdr, FsOptions::new())?;
let root_dir = fs.root_dir();
let dir = match env::args().nth(1) {
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None => root_dir,
Some(ref path) if path == "." => root_dir,
Some(ref path) => root_dir.open_dir(&path)?,
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};
for r in dir.iter() {
let e = r?;
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let modified = DateTime::<Local>::from(e.modified()).format("%Y-%m-%d %H:%M:%S").to_string();
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println!("{:4} {} {}", format_file_size(e.len()), modified, e.file_name());
}
Ok(())
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}