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//! Somewhat complex example of usage of structopt.
use structopt::StructOpt;
#[derive(StructOpt, Debug)]
#[structopt(name = "example")]
/// An example of StructOpt usage.
struct Opt {
// A flag, true if used in the command line.
#[structopt(short, long)]
/// Activate debug mode
debug: bool,
// An argument of type float, with a default value.
#[structopt(short, long, default_value = "42")]
/// Set speed
speed: f64,
// Needed parameter, the first on the command line.
/// Input file
input: String,
// An optional parameter, will be `None` if not present on the
// command line.
/// Output file, stdout if not present
output: Option<String>,
// An optional parameter with optional value, will be `None` if
// not present on the command line, will be `Some(None)` if no
// argument is provided (i.e. `--log`) and will be
// `Some(Some(String))` if argument is provided (e.g. `--log
// log.txt`).
#[structopt(long)]
#[allow(clippy::option_option)]
/// Log file, stdout if no file, no logging if not present
log: Option<Option<String>>,
// An optional list of values, will be `None` if not present on
// the command line, will be `Some(vec![])` if no argument is
// provided (i.e. `--optv`) and will be `Some(Some(String))` if
// argument list is provided (e.g. `--optv a b c`).
#[structopt(long)]
optv: Option<Vec<String>>,
// Skipped option: it won't be parsed and will be filled with the
// default value for its type (in this case it'll be an empty string).
#[structopt(skip)]
skipped: String,
}
fn main() {
let opt = Opt::from_args();
println!("{:?}", opt);
}
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