mirror of
https://github.com/clap-rs/clap
synced 2024-12-14 06:42:33 +00:00
77 lines
3.6 KiB
Rust
77 lines
3.6 KiB
Rust
use clap::App;
|
|
|
|
fn main() {
|
|
// This example shows how to create an application with several arguments using usage strings, which can be
|
|
// far less verbose that shown in 01b_QuickExample.rs, but is more readable. The downside is you cannot set
|
|
// the more advanced configuration options using this method (well...actually you can, you'll see ;) )
|
|
//
|
|
// The example below is functionally identical to the 01b_quick_example.rs
|
|
//
|
|
// Create an application with 5 possible arguments (2 auto generated) and 2 subcommands (1 auto generated)
|
|
// - A config file
|
|
// + Uses "-c filename" or "--config filename"
|
|
// - An output file
|
|
// + A positional argument (i.e. "$ myapp output_filename")
|
|
// - A debug flag
|
|
// + Uses "-d" or "--debug"
|
|
// + Allows multiple occurrences of such as "-dd" (for vary levels of debugging, as an example)
|
|
// - A help flag (automatically generated by clap)
|
|
// + Uses "-h" or "--help" (Only autogenerated if you do NOT specify your own "-h" or "--help")
|
|
// - A version flag (automatically generated by clap)
|
|
// + Uses "-V" or "--version" (Only autogenerated if you do NOT specify your own "-V" or "--version")
|
|
// - A subcommand "test" (subcommands behave like their own apps, with their own arguments
|
|
// + Used by "$ myapp test" with the following arguments
|
|
// > A list flag
|
|
// = Uses "-l" (usage is "$ myapp test -l"
|
|
// > A help flag (automatically generated by clap
|
|
// = Uses "-h" or "--help" (full usage "$ myapp test -h" or "$ myapp test --help")
|
|
// > A version flag (automatically generated by clap
|
|
// = Uses "-V" or "--version" (full usage "$ myapp test -V" or "$ myapp test --version")
|
|
// - A subcommand "help" (automatically generated by clap because we specified a subcommand of our own)
|
|
// + Used by "$ myapp help" (same functionality as "-h" or "--help")
|
|
let matches = App::new("MyApp")
|
|
.version("1.0")
|
|
.author("Kevin K. <kbknapp@gmail.com>")
|
|
.about("Does awesome things")
|
|
.arg("-c, --config=[FILE] 'Sets a custom config file'")
|
|
.arg("[output] 'Sets an optional output file'")
|
|
.arg("-d..., --debug... 'Turn debugging information on'")
|
|
.subcommand(
|
|
App::new("test")
|
|
.about("does testing things")
|
|
.arg("-l, --list 'lists test values'"),
|
|
)
|
|
.get_matches();
|
|
|
|
// You can check the value provided by positional arguments, or option arguments
|
|
if let Some(o) = matches.value_of("output") {
|
|
println!("Value for output: {}", o);
|
|
}
|
|
|
|
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("debug") {
|
|
0 => println!("Debug mode is off"),
|
|
1 => println!("Debug mode is kind of on"),
|
|
2 => println!("Debug mode is on"),
|
|
_ => 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(matches) = matches.subcommand_matches("test") {
|
|
// "$ myapp test" was run
|
|
if matches.is_present("list") {
|
|
// "$ myapp test -l" was run
|
|
println!("Printing testing lists...");
|
|
} else {
|
|
println!("Not printing testing lists...");
|
|
}
|
|
}
|
|
|
|
// Continued program logic goes here...
|
|
}
|