Filesystem operations

Here is an example that shows some info for all files in the current directory:

// code from Chapter 11/code/read_files_in_dir.rs: 
use std::env; 
use std::fs; 
use std::error::Error; 
 
fn main() { 
    show_dir().unwrap(); 
} 
 
fn show_dir() -> Result<(), Box<Error>> { 
    let here = try!(env::current_dir()); 
    println!("Contents in: {}", here.display()); 
    for entry in try!(fs::read_dir(&here)) { 
        let path = try!(entry).path(); 
        let md = try!(fs::metadata(&path));        println!("  {} ({} bytes)", path.display(), md.len()); 
    } 
    Ok(()) 
} 

This prints out:

Contents in: F:\Rust\Rust book\The Rust Programming Language\Chapter 11 - Working with files\code F:\Rust\Rust book\The Rust Programming Language\Chapter 11 - Working with files\code\read_file.rs (710 bytes) F:\Rust\Rust book\The Rust Programming Language\Chapter 11 - Working with files\code\read_files_in_dir.exe (2382143 bytes)

Here are some remarks to clarify the code:

• This code uses the current_dir method from std::env, reads that folder with read_dir, and iterates over all files it contains with for entry in
• To manipulate the filesystem, see filesystem.rs in the code download for examples, which demonstrates the use of the methods create_dir, create_dir_all, remove_file, remove_dir, and read_dir
• The kind() method is used here in the error case, to display the specific I/O error category (from the std::io::ErrorKind enum)
• The fs::read_dir method is used to read the contents of a directory, returning an io::Result<Vec<Path>> paths, which can be looped through with this code:

for path in paths { 
    println!("> {:?}", path.unwrap().path()); 
}