mirror of
https://github.com/clap-rs/clap
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56 lines
3.6 KiB
Rust
56 lines
3.6 KiB
Rust
extern crate clap;
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use clap::{App, Arg};
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fn main() {
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// Positional arguments are those values after the program name which are not preceded by any
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// identifier (such as "myapp some_file"). Positionals support many of the same options as
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// flags, as well as a few additional ones.
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let matches = App::new("MyApp")
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// Regular App configuration goes here...
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// We'll add two positional arguments, a input file, and a config file.
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//
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// I'll explain each possible setting that "positionals" accept. Keep in
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// mind that you DO NOT need to set each of these for every flag, only the
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// ones that apply to your individual case.
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.arg(Arg::with_name("input")
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.help("the input file to use") // Displayed when showing help info
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.index(1) // Set the order in which the user must
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// specify this argument (Starts at 1)
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.requires("config") // Says, "If the user uses "input", they MUST
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// also use this other 'config' arg too"
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// Can also specifiy a list using
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// requires_all(Vec<&str>)
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.conflicts_with("output") // Opposite of requires(), says "if the
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// user uses -a, they CANNOT use 'output'"
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// also has a mutually_excludes_all(Vec<&str>)
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.required(true) // By default this argument MUST be present
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// NOTE: mutual exclusions take precedence over
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// required arguments
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)
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.arg(Arg::with_name("config")
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.help("the config file to use")
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.index(2)) // Note, we do not need to specify required(true)
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// if we don't want to, because "input" already
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// requires "config"
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// Note, we also do not need to specify requires("input")
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// because requires lists are automatically two-way
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// NOTE: In order to compile this example, comment out mutually_excludes()
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// because we have not defined an "output" argument.
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.get_matches();
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// We can find out whether or not "input" or "config" were used
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if matches.is_present("input") {
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println!("An input file was specified");
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}
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// We can also get the values for those arguments
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if let Some(ref in_file) = matches.value_of("input") {
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// It's safe to call unwrap() because of the required options we set above
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println!("Doing work with {} and {}", in_file, matches.value_of("config").unwrap());
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}
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// Continued program logic goes here...
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}
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