mirror of
https://github.com/clap-rs/clap
synced 2024-12-15 15:22:30 +00:00
102 lines
2.9 KiB
Rust
102 lines
2.9 KiB
Rust
use clap::builder::TypedValueParser as _;
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use clap::Parser;
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use std::error::Error;
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#[derive(Parser, Debug)] // requires `derive` feature
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#[command(term_width = 0)] // Just to make testing across clap features easier
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struct Args {
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/// Implicitly using `std::str::FromStr`
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#[arg(short = 'O')]
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optimization: Option<usize>,
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/// Allow invalid UTF-8 paths
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#[arg(short = 'I', value_name = "DIR", value_hint = clap::ValueHint::DirPath)]
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include: Option<std::path::PathBuf>,
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/// Handle IP addresses
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#[arg(long)]
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bind: Option<std::net::IpAddr>,
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/// Allow human-readable durations
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#[arg(long)]
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sleep: Option<humantime::Duration>,
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/// Hand-written parser for tuples
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#[arg(short = 'D', value_parser = parse_key_val::<String, i32>)]
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defines: Vec<(String, i32)>,
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/// Support for discrete numbers
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#[arg(
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long,
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default_value_t = 22,
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value_parser = clap::builder::PossibleValuesParser::new(["22", "80"])
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.map(|s| s.parse::<usize>().unwrap()),
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)]
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port: usize,
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/// Support enums from a foreign crate that don't implement `ValueEnum`
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#[arg(
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long,
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default_value_t = foreign_crate::LogLevel::Info,
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value_parser = clap::builder::PossibleValuesParser::new(["info", "debug", "info", "warn", "error"])
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.map(|s| s.parse::<foreign_crate::LogLevel>().unwrap()),
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)]
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log_level: foreign_crate::LogLevel,
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}
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/// Parse a single key-value pair
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fn parse_key_val<T, U>(s: &str) -> Result<(T, U), Box<dyn Error + Send + Sync + 'static>>
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where
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T: std::str::FromStr,
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T::Err: Error + Send + Sync + 'static,
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U: std::str::FromStr,
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U::Err: Error + Send + Sync + 'static,
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{
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let pos = s
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.find('=')
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.ok_or_else(|| format!("invalid KEY=value: no `=` found in `{s}`"))?;
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Ok((s[..pos].parse()?, s[pos + 1..].parse()?))
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}
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mod foreign_crate {
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#[derive(Copy, Clone, PartialEq, Eq, Debug)]
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pub enum LogLevel {
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Trace,
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Debug,
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Info,
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Warn,
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Error,
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}
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impl std::fmt::Display for LogLevel {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let s = match self {
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Self::Trace => "trace",
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Self::Debug => "debug",
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Self::Info => "info",
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Self::Warn => "warn",
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Self::Error => "error",
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};
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s.fmt(f)
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}
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}
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impl std::str::FromStr for LogLevel {
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type Err = String;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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match s {
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"trace" => Ok(Self::Trace),
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"debug" => Ok(Self::Debug),
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"info" => Ok(Self::Info),
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"warn" => Ok(Self::Warn),
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"error" => Ok(Self::Error),
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_ => Err(format!("Unknown log level: {s}")),
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}
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}
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}
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}
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fn main() {
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let args = Args::parse();
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println!("{args:?}");
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}
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