mirror of
https://github.com/clap-rs/clap
synced 2024-12-13 06:12:40 +00:00
84 lines
4 KiB
Rust
84 lines
4 KiB
Rust
extern crate clap;
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use clap::{App, Arg, SubCommand};
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fn main() {
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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(Arg::new("config")
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.short("c")
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.long("config")
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.help("Sets a custom config file")
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.takes_value(true))
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.arg(Arg::new("output")
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.help("Sets an optional output file")
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.index(1))
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.arg(Arg::new("debug")
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.short("d")
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.multiple(true)
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.help("Turn debugging information on"))
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.subcommand(SubCommand::new("test")
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.about("does testing things")
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.arg(Arg::new("list")
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.short("l")
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.help("lists test values")))
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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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3 | _ => println!("Don't be crazy"),
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}
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// You can check for the existance 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(ref 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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