mirror of
https://github.com/clap-rs/clap
synced 2024-12-13 06:12:40 +00:00
54 lines
2.5 KiB
Rust
54 lines
2.5 KiB
Rust
extern crate clap;
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use clap::{App, Arg};
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fn main() {
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// Once all App settings (including all arguments) have been set, you call get_matches() which
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// parses the string provided by the user, and returns all the valid matches to the ones you
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// specified.
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//
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// You can then query the matches struct to get information about how the user ran the program
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// at startup.
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//
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// For this example, let's assume you created an App which accepts three arguments (plus two
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// generated by clap), a flag to display debugging information triggered with "-d" or
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// "--debug" as well as an option argument which specifies a custom configuration file to use
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// triggered with "-c file" or "--config file" or "--config=file" and finally a positional
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// argument which is the input file we want to work with, this will be the only required
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// argument.
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let matches = App::new("MyApp")
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.about("Parses an input file to do awesome things")
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.version("1.0")
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.author("Kevin K. <kbknapp@gmail.com>")
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.arg(Arg::with_name("debug")
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.help("turn on debugging information")
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.short("d")
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.long("debug"))
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.arg(Arg::with_name("config")
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.help("sets the config file to use")
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.short("c")
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.long("config"))
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.arg(Arg::with_name("input")
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.help("the input file to use")
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.index(1)
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.required(true))
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.get_matches();
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// We can find out whether or not debugging was turned on
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if matches.is_present("debug") {
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println!("Debugging is turned on");
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}
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// If we wanted to some custom initialization based off some configuration file provided
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// by the user, we could get the file (A string of the file)
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if let Some(ref file) = matches.value_of("config") {
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println!("Using config file: {}", file);
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}
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// Because "input" is required we can safely call unwrap() because had the user NOT
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// specified a value, clap would have explained the error the user, and exited.
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println!("Doing real work with file: {}", matches.value_of("input").unwrap() );
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// Continued program logic goes here...
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}
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