From 5e20a29b4fdc8a2d442d1093681b396dcb4b816b Mon Sep 17 00:00:00 2001 From: Robin Krahl Date: Tue, 7 Jan 2020 11:18:04 +0000 Subject: Add structopt dependency in version 0.3.7 This patch series replaces argparse with structopt in the argument handling code. As a first step, we need structopt as a dependency. Import subrepo structopt/:structopt at efbdda4753592e27bc430fb01f7b9650b2f3174d Import subrepo bitflags/:bitflags at 30668016aca6bd3b02c766e8347e0b4080d4c296 Import subrepo clap/:clap at 784524f7eb193e35f81082cc69454c8c21b948f7 Import subrepo heck/:heck at 093d56fbf001e1506e56dbfa38631d99b1066df1 Import subrepo proc-macro-error/:proc-macro-error at 6c4cfe79a622c5de8ae68557993542be46eacae2 Import subrepo proc-macro2/:proc-macro2 at d5d48eddca4566e5438e8a2cbed4a74e049544de Import subrepo quote/:quote at 727436c6c137b20f0f34dde5d8fda2679b9747ad Import subrepo rustversion/:rustversion at 0c5663313516263059ce9059ef81fc7a1cf655ca Import subrepo syn-mid/:syn-mid at 5d3d85414a9e6674e1857ec22a87b96e04a6851a Import subrepo syn/:syn at e87c27e87f6f4ef8919d0372bdb056d53ef0d8f3 Import subrepo textwrap/:textwrap at abcd618beae3f74841032aa5b53c1086b0a57ca2 Import subrepo unicode-segmentation/:unicode-segmentation at 637c9874c4fe0c205ff27787faf150a40295c6c3 Import subrepo unicode-width/:unicode-width at 3033826f8bf05e82724140a981d5941e48fce393 Import subrepo unicode-xid/:unicode-xid at 4baae9fffb156ba229665b972a9cd5991787ceb7 --- clap/examples/04_using_matches.rs | 54 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 clap/examples/04_using_matches.rs (limited to 'clap/examples/04_using_matches.rs') diff --git a/clap/examples/04_using_matches.rs b/clap/examples/04_using_matches.rs new file mode 100644 index 0000000..a0a986f --- /dev/null +++ b/clap/examples/04_using_matches.rs @@ -0,0 +1,54 @@ +extern crate clap; + +use clap::{App, Arg}; + +fn main() { + + // Once all App settings (including all arguments) have been set, you call get_matches() which + // parses the string provided by the user, and returns all the valid matches to the ones you + // specified. + // + // You can then query the matches struct to get information about how the user ran the program + // at startup. + // + // For this example, let's assume you created an App which accepts three arguments (plus two + // generated by clap), a flag to display debugging information triggered with "-d" or + // "--debug" as well as an option argument which specifies a custom configuration file to use + // triggered with "-c file" or "--config file" or "--config=file" and finally a positional + // argument which is the input file we want to work with, this will be the only required + // argument. + let matches = App::new("MyApp") + .about("Parses an input file to do awesome things") + .version("1.0") + .author("Kevin K. ") + .arg(Arg::with_name("debug") + .help("turn on debugging information") + .short("d") + .long("debug")) + .arg(Arg::with_name("config") + .help("sets the config file to use") + .short("c") + .long("config")) + .arg(Arg::with_name("input") + .help("the input file to use") + .index(1) + .required(true)) + .get_matches(); + + // We can find out whether or not debugging was turned on + if matches.is_present("debug") { + println!("Debugging is turned on"); + } + + // If we wanted to do some custom initialization based off some configuration file + // provided by the user, we could get the file (A string of the file) + if let Some(file) = matches.value_of("config") { + println!("Using config file: {}", file); + } + + // Because "input" is required we can safely call unwrap() because had the user NOT + // specified a value, clap would have explained the error the user, and exited. + println!("Doing real work with file: {}", matches.value_of("input").unwrap() ); + + // Continued program logic goes here... +} -- cgit v1.2.1