# clap-file
[](https://doc.rust-lang.org/cargo/reference/manifest.html#the-badges-section)
[](#license)
[](https://crates.io/crates/clap-file)
[](https://docs.rs/clap-file)
[](https://doc.rust-lang.org/cargo/reference/manifest.html#the-rust-version-field)
[](https://github.com/gifnksm/clap-file/actions/workflows/ci.yml)
[](https://codecov.io/gh/gifnksm/clap-file)
Provides types for clap’s derive interface, enabling easy handling of input/output with automatically opened files or standard input/output based on command-line arguments.
## Usage
Run `cargo add clap-file` or add this to your `Cargo.toml`:
````toml
[dependencies]
clap-file = "0.2.0"
````
## Examples
Example usage of [`Input`](https://docs.rs/clap-file/0.2.0/clap_file/input/struct.Input.html) ans [`Output`](https://docs.rs/clap-file/0.2.0/clap_file/output/struct.Output.html) types:
````rust,no_run
use std::io::{self, BufRead as _, Write as _};
use clap::Parser as _;
use clap_file::{Input, Output};
struct Args {
/// Input file. If not provided, reads from standard input.
input: Input,
/// output file. If not provided, reads from standard output.
output: Output,
}
fn main() -> io::Result<()> {
let args = Args::parse();
let input = args.input.lock();
let mut output = args.output.lock();
for line in input.lines() {
let line = line?;
writeln!(&mut output, "{line}")?;
}
Ok(())
}
````
## Minimum supported Rust version (MSRV)
The minimum supported Rust version is **Rust 1.74.0**.
At least the last 3 versions of stable Rust are supported at any given time.
While a crate is a pre-release status (0.x.x) it may have its MSRV bumped in a patch release.
Once a crate has reached 1.x, any MSRV bump will be accompanied by a new minor version.
## License
This project is licensed under either of
* Apache License, Version 2.0
([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
* MIT license
([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
at your option.
## Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.
See [CONTRIBUTING.md](CONTRIBUTING.md).