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https://github.com/clap-rs/clap
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594c535ba2
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57 lines
2.4 KiB
Rust
57 lines
2.4 KiB
Rust
use clap::{App, Arg};
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fn main() {
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// s function exactly like sub-Apps, because that's exactly what they are. Each
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// instance of a can have its own version, author(s), Args, and even its own
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// subcommands.
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//
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// # Help and Version
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// Just like Apps, each subcommand will get its own "help" and "version" flags automatically
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// generated. Also, like Apps, you can override "-V" or "-h" safely and still get "--help" and
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// "--version" auto generated.
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//
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// NOTE: If you specify a subcommand for your App, clap will also autogenerate a "help"
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// subcommand along with "-h" and "--help" (applies to sub-subcommands as well).
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//
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// Just like arg() and args(), subcommands can be specified one at a time via subcommand() or
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// multiple ones at once with a Vec<> provided to subcommands().
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let matches = App::new("MyApp")
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// Normal App and Arg configuration goes here...
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// In the following example assume we wanted an application which
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// supported an "add" subcommand, this "add" subcommand also took
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// one positional argument of a file to add:
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.subcommand(
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App::new("add") // The name we call argument with
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.about("Adds files to myapp") // The message displayed in "myapp -h"
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// or "myapp help"
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.version("0.1") // Subcommands can have independent version
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.author("Kevin K.") // And authors
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.arg(
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Arg::new("input") // And their own arguments
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.about("the file to add")
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.index(1)
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.required(true),
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),
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)
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.get_matches();
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// You can check if a subcommand was used like normal
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if matches.is_present("add") {
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println!("'myapp add' was run.");
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}
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// You can get the independent subcommand matches (which function exactly like App matches)
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if let Some(ref matches) = matches.subcommand_matches("add") {
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// Safe to use unwrap() because of the required() option
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println!("Adding file: {}", matches.value_of("input").unwrap());
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}
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// You can also match on a subcommand's name
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match matches.subcommand_name() {
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Some("add") => println!("'myapp add' was used"),
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None => println!("No subcommand was used"),
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_ => println!("Some other subcommand was used"),
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}
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// Continued program logic goes here...
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}
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