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use clap::Parser;
use std::fs;
use std::io;
#[derive(Parser, Debug)]
#[command(author, version, about, long_about=None)]
struct Args {
/// Files to decompress. With no file, or when given -, read standard input.
file: Vec<String>,
}
fn main() {
// This will be a simple application:
// takes a single (repeatable and optional) argument.
let args = Args::parse();
// If nothing was given, act as if `-` was there.
if args.file.is_empty() {
decompress_file("-").unwrap();
} else {
for file in &args.file {
decompress_file(file).unwrap();
}
}
}
// Dispatch the source reader depending on the filename
fn decompress_file(file: &str) -> io::Result<()> {
match file {
"-" => decompress_from(io::stdin()),
other => decompress_from(io::BufReader::new(fs::File::open(other)?)),
}
}
// Decompress from a `Reader` into stdout
fn decompress_from<R: io::Read>(r: R) -> io::Result<()> {
let mut decoder = zstd::Decoder::new(r)?;
io::copy(&mut decoder, &mut io::stdout())?;
Ok(())
}
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