Compress a folder content to gzip

main.rs

use flate2::write::GzEncoder;
use flate2::Compression;
use std::env::args;
use std::fs::{create_dir, metadata, read_dir, File};
use std::io::{copy, BufReader};
use std::path::{Path, PathBuf};
use std::time::Instant;

fn main() {
    if args().len() < 3 {
        println!("Usage: cargo run --release <source> <target>");
        return;
    }

    let source = args().nth(1).unwrap();
    let target = args().nth(2).unwrap();

    // create target directory if it doesn't exist
    if metadata(target.clone()).is_err() {
        create_dir(target.clone()).unwrap();
    }

    // list all files in directory
    let dir = read_dir(source).unwrap();
    for entry in dir {
        let entry = entry.unwrap();
        let path = entry.path();

        if path.is_file() {
            let output_path = Path::new(&target).join(path.file_name().unwrap());
            convert_to_gz(path, output_path);
        }
    }
}

fn convert_to_gz(path: PathBuf, output: PathBuf) {
    let mut input = BufReader::new(File::open(path.clone()).unwrap());
    let output_file_name = format!("{}.gz", output.display());
    let output = File::create(output_file_name.clone()).unwrap();

    let mut encoder = GzEncoder::new(output, Compression::default());

    let start = Instant::now();
    copy(&mut input, &mut encoder).unwrap();
    let output = encoder.finish().unwrap();
    println!(
        "Converted {:?}({}) to {:?}({}) in {:?}",
        path,
        input.get_ref().metadata().unwrap().len(),
        output_file_name,
        output.metadata().unwrap().len(),
        start.elapsed()
    );
}

Example output:

Converted "mini/japanese_stone_wall_rough_4k.exr"(10408086) to "compressed/japanese_stone_wall_rough_4k.exr.gz"(10285609) in 248.915937ms
Converted "mini/scene.bin"(3318856) to "compressed/scene.bin.gz"(1670739) in 94.270579ms
Converted "mini/japanese_stone_wall_disp_4k.png"(21913988) to "compressed/japanese_stone_wall_disp_4k.png.gz"(21917038) in 497.468034ms
Converted "mini/scene.gltf"(133972) to "compressed/scene.gltf.gz"(20400) in 1.57042ms
Converted "mini/japanese_stone_wall_diff_4k.jpg"(19632248) to "compressed/japanese_stone_wall_diff_4k.jpg.gz"(19347170) in 465.04319ms
Converted "mini/japanese_stone_wall_nor_gl_4k.exr"(30364433) to "compressed/japanese_stone_wall_nor_gl_4k.exr.gz"(30197609) in 696.086202ms

Only gltf and bin files have relevant compression.