This crate provides attribute macros for command-line argument parsing.
Just by adding an attribute #[cmd] to a function, the function is converted to a command line program.
use argopt::cmd;
#[cmd]
fn main(host: String, port: u16) {
// ...
}The output is:
$ cargo run
error: The following required arguments were not provided:
<host>
<port>
USAGE:
argopt-test <host> <port>
You can customize the behavior of arguments by annotating them with attributes.
use argopt::cmd;
#[cmd]
fn main(
#[opt(short = "h", long = "host")]
host: String,
#[opt(short, long, default_value = "80")]
port: u16,
) {
// ...
}And you can add help messages by adding doccomments.
use argopt::cmd;
/// Sample program
#[cmd]
fn main(
/// Host name
#[opt(short = "h", long = "host")]
host: String,
/// Port number
#[opt(short, long, default_value = "80")]
port: u16,
) {
// ...
}The output is:
argopt-test 0.1.0
Sample program
USAGE:
simple [OPTIONS] --host <host>
FLAGS:
--help Prints help information
-V, --version Prints version information
OPTIONS:
-h, --host <host> Host name
-p, --port <port> Port number [default: 80]
You can use the same options as structopt.
You can create sub commands by adding the attribute #[subcmd] to functions.
use argopt::{subcmd, cmd_group};
use std::path::PathBuf;
#[subcmd]
fn add(
#[opt(short)]
interactive: bool,
#[opt(short)]
patch: bool,
files: Vec<PathBuf>,
) {
// ...
}
#[subcmd]
fn commit(
#[opt(short)]
message: Option<String>,
#[opt(short)]
all: bool,
) {
// ...
}
#[cmd_group(commands = [add, commit])]
fn main() {}There is a feature that allows you to interact with the log crate and handle the verbosity level automatically.
use argopt::cmd;
use log::*;
#[cmd(verbose)]
fn main() {
error!("This is error");
warn!("This is warn");
info!("This is info");
debug!("This is debug");
trace!("This is trace");
}The output is:
$ cargo run
This is error
$ cargo run -- -v
This is error
This is warn
$ cargo run -- -vv
This is error
This is warn
This is info
$ cargo run -- -vvv
This is error
This is warn
This is info
This is debug
$ cargo run -- -vvvv
This is error
This is warn
This is info
This is debug
This is trace
License: MIT
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