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Merge pull request #2286 from jder/non-structopt-usage

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docs: add back example of using non-structopt arguments
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Pavan Kumar Sunkara 2021-01-03 22:04:03 +00:00 committed by GitHub
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@ -205,7 +205,7 @@ fn main() {
This second method shows a method using the 'Builder Pattern' which allows more advanced configuration options (not shown in this small example), or even dynamically generating arguments when desired. The downside is it's more verbose. This second method shows a method using the 'Builder Pattern' which allows more advanced configuration options (not shown in this small example), or even dynamically generating arguments when desired. The downside is it's more verbose.
```rust,no_run ```rust,no_run
// (Full example with detailed comments in examples/01a_quick_example.rs) // (Full example with detailed comments in examples/01b_quick_example.rs)
// //
// This example demonstrates clap's "builder pattern" method of creating arguments // This example demonstrates clap's "builder pattern" method of creating arguments
// which the most flexible, but also most verbose. // which the most flexible, but also most verbose.
@ -239,7 +239,37 @@ fn main() {
.about("print debug information verbosely"))) .about("print debug information verbosely")))
.get_matches(); .get_matches();
// Same as above examples... // You can check the value provided by positional arguments, or option arguments
if let Some(i) = matches.value_of("input") {
println!("Value for input: {}", i);
}
if let Some(c) = matches.value_of("config") {
println!("Value for config: {}", c);
}
// You can see how many times a particular flag or argument occurred
// Note, only flags can have multiple occurrences
match matches.occurrences_of("v") {
0 => println!("Verbose mode is off"),
1 => println!("Verbose mode is kind of on"),
2 => println!("Verbose mode is on"),
3 | _ => println!("Don't be crazy"),
}
// You can check for the existence of subcommands, and if found use their
// matches just as you would the top level app
if let Some(ref matches) = matches.subcommand_matches("test") {
// "$ myapp test" was run
if matches.is_present("debug") {
// "$ myapp test -d" was run
println!("Printing debug info...");
} else {
println!("Printing normally...");
}
}
// Continued program logic goes here...
} }
``` ```