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