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Diffstat (limited to 'clap/examples/07_option_args.rs')
| -rw-r--r-- | clap/examples/07_option_args.rs | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/clap/examples/07_option_args.rs b/clap/examples/07_option_args.rs deleted file mode 100644 index 85ff0e5..0000000 --- a/clap/examples/07_option_args.rs +++ /dev/null @@ -1,71 +0,0 @@ -extern crate clap; - -use clap::{App, Arg}; - -fn main() { - - // Option arguments are those that take an additional value, such as "-c value". In clap they - // support three types of specification, those with short() as "-o some", or those with long() - // as "--option value" or "--option=value" - // - // Options also support a multiple setting, which is discussed in the example below. - let matches = App::new("MyApp") - // Regular App configuration goes here... - - // Assume we have an application that accepts an input file via the "-i file" - // or the "--input file" (as well as "--input=file"). - // Below every setting supported by option arguments is discussed. - // NOTE: You DO NOT need to specify each setting, only those which apply - // to your particular case. - .arg(Arg::with_name("input") - .help("the input file to use") // Displayed when showing help info - .takes_value(true) // MUST be set to true in order to be an "option" argument - .short("i") // This argument is triggered with "-i" - .long("input") // This argument is triggered with "--input" - .multiple(true) // Set to true if you wish to allow multiple occurrences - // such as "-i file -i other_file -i third_file" - .required(true) // By default this argument MUST be present - // NOTE: mutual exclusions take precedence over - // required arguments - .requires("config") // Says, "If the user uses "input", they MUST - // also use this other 'config' arg too" - // Can also specify a list using - // requires_all(Vec<&str>) - .conflicts_with("output") // Opposite of requires(), says "if the - // user uses -a, they CANNOT use 'output'" - // also has a conflicts_with_all(Vec<&str>) - ) - // NOTE: In order to compile this example, comment out conflicts_with() - // and requires() because we have not defined an "output" or "config" - // argument. - .get_matches(); - - // We can find out whether or not "input" was used - if matches.is_present("input") { - println!("An input file was specified"); - } - - // We can also get the value for "input" - // - // NOTE: If we specified multiple(), this will only return the _FIRST_ - // occurrence - if let Some(in_file) = matches.value_of("input") { - println!("An input file: {}", in_file); - } - - // If we specified the multiple() setting we can get all the values - if let Some(in_v) = matches.values_of("input") { - for in_file in in_v { - println!("An input file: {}", in_file); - } - } - - // We can see how many times the option was used with the occurrences_of() method - // - // NOTE: Just like with flags, if we did not specify the multiple() setting this will only - // return 1 no matter how many times the argument was used (unless it wasn't used at all, in - // in which case 0 is returned) - println!("The \"input\" argument was used {} times", matches.occurrences_of("input")); - - // Continued program logic goes here... -} |