mirror of
https://github.com/clap-rs/clap
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af45420027
> incidentally, how do we feel about adding a rustfmt check to the CI(s)? yes we should be doing that. you can send another pr that adds the check to the Ci
63 lines
2.3 KiB
Rust
63 lines
2.3 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(
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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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)
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.arg(
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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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.takes_value(true),
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)
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.arg(
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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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)
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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!(
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"Doing real work with file: {}",
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matches.value_of("input").unwrap()
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);
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// Continued program logic goes here...
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}
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