mirror of
https://github.com/clap-rs/clap
synced 2024-12-15 07:12:32 +00:00
4e1da91fb1
Comments in 04_using_matches.rs list the config arg as an optional arg. However, -c --config is currently a flag arg. This commit sets takes_value to true on the config arg to make it an "option" argument.
63 lines
2.3 KiB
Rust
63 lines
2.3 KiB
Rust
extern crate clap;
|
|
|
|
use clap::{App, Arg};
|
|
|
|
fn main() {
|
|
// Once all App settings (including all arguments) have been set, you call get_matches() which
|
|
// parses the string provided by the user, and returns all the valid matches to the ones you
|
|
// specified.
|
|
//
|
|
// You can then query the matches struct to get information about how the user ran the program
|
|
// at startup.
|
|
//
|
|
// For this example, let's assume you created an App which accepts three arguments (plus two
|
|
// generated by clap), a flag to display debugging information triggered with "-d" or
|
|
// "--debug" as well as an option argument which specifies a custom configuration file to use
|
|
// triggered with "-c file" or "--config file" or "--config=file" and finally a positional
|
|
// argument which is the input file we want to work with, this will be the only required
|
|
// argument.
|
|
let matches = App::new("MyApp")
|
|
.about("Parses an input file to do awesome things")
|
|
.version("1.0")
|
|
.author("Kevin K. <kbknapp@gmail.com>")
|
|
.arg(
|
|
Arg::with_name("debug")
|
|
.help("turn on debugging information")
|
|
.short('d')
|
|
.long("debug"),
|
|
)
|
|
.arg(
|
|
Arg::with_name("config")
|
|
.help("sets the config file to use")
|
|
.short('c')
|
|
.long("config")
|
|
.takes_value(true),
|
|
)
|
|
.arg(
|
|
Arg::with_name("input")
|
|
.help("the input file to use")
|
|
.index(1)
|
|
.required(true),
|
|
)
|
|
.get_matches();
|
|
|
|
// We can find out whether or not debugging was turned on
|
|
if matches.is_present("debug") {
|
|
println!("Debugging is turned on");
|
|
}
|
|
|
|
// If we wanted to some custom initialization based off some configuration file provided
|
|
// by the user, we could get the file (A string of the file)
|
|
if let Some(ref file) = matches.value_of("config") {
|
|
println!("Using config file: {}", file);
|
|
}
|
|
|
|
// Because "input" is required we can safely call unwrap() because had the user NOT
|
|
// specified a value, clap would have explained the error the user, and exited.
|
|
println!(
|
|
"Doing real work with file: {}",
|
|
matches.value_of("input").unwrap()
|
|
);
|
|
|
|
// Continued program logic goes here...
|
|
}
|