mirror of
https://github.com/clap-rs/clap
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75 lines
3.7 KiB
Rust
75 lines
3.7 KiB
Rust
use clap::clap_app;
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fn main() {
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// This example shows how to create an application with several arguments using macro builder.
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// It combines the simplicity of the from_usage methods and the performance of the Builder Pattern.
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//
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// The example below is functionally identical to the one in 01a_quick_example.rs and 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 = clap_app!(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 CONFIG: -c --config +takes_value "Sets a custom config file")
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(@arg INPUT: +required "Sets the input file to use")
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(@arg debug: -d ... "Sets the level of debugging information")
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(@subcommand test =>
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(about: "controls testing features")
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(version: "1.3")
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(author: "Someone E. <someone_else@other.com>")
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(@arg verbose: -v --verbose "Print test information verbosely")
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)
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)
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.get_matches();
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// Calling .unwrap() is safe here because "INPUT" is required (if "INPUT" wasn't
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// required we could have used an 'if let' to conditionally get the value)
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println!("Using input file: {}", matches.value_of("INPUT").unwrap());
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// Gets a value for config if supplied by user, or defaults to "default.conf"
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let config = matches.value_of("CONFIG").unwrap_or("default.conf");
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println!("Value for config: {}", config);
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// Vary the output based on how many times the user used the "debug" flag
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// (i.e. 'myapp -d -d -d' or 'myapp -ddd' vs 'myapp -d'
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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 information about subcommands by requesting their matches by name
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// (as below), requesting just the name used, or both at the same time
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if let Some(matches) = matches.subcommand_matches("test") {
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if matches.is_present("verbose") {
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println!("Printing verbosely...");
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} else {
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println!("Printing normally...");
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}
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}
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// more program logic goes here...
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}
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