clap/examples/tutorial_derive/04_03_relations.rs

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use clap::{ArgGroup, Parser};
#[derive(Parser)]
#[clap(author, version, about, long_about = None)]
#[clap(group(
ArgGroup::new("vers")
.required(true)
.args(&["set-ver", "major", "minor", "patch"]),
))]
struct Cli {
/// set version manually
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#[clap(long, value_name = "VER", value_parser)]
set_ver: Option<String>,
/// auto inc major
#[clap(long, action)]
major: bool,
/// auto inc minor
#[clap(long, action)]
minor: bool,
/// auto inc patch
#[clap(long, action)]
patch: bool,
/// some regular input
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#[clap(group = "input", value_parser)]
input_file: Option<String>,
/// some special input argument
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#[clap(long, group = "input", value_parser)]
spec_in: Option<String>,
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#[clap(short, requires = "input", value_parser)]
config: Option<String>,
}
fn main() {
let cli = Cli::parse();
// Let's assume the old version 1.2.3
let mut major = 1;
let mut minor = 2;
let mut patch = 3;
// See if --set-ver was used to set the version manually
let version = if let Some(ver) = cli.set_ver.as_deref() {
ver.to_string()
} else {
// Increment the one requested (in a real program, we'd reset the lower numbers)
let (maj, min, pat) = (cli.major, cli.minor, cli.patch);
match (maj, min, pat) {
(true, _, _) => major += 1,
(_, true, _) => minor += 1,
(_, _, true) => patch += 1,
_ => unreachable!(),
};
format!("{}.{}.{}", major, minor, patch)
};
println!("Version: {}", version);
// Check for usage of -c
if let Some(config) = cli.config.as_deref() {
let input = cli
.input_file
.as_deref()
.unwrap_or_else(|| cli.spec_in.as_deref().unwrap());
println!("Doing work using input {} and config {}", input, config);
}
}