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/06_positional_args.rs | 56 +++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 clap/examples/06_positional_args.rs (limited to 'clap/examples/06_positional_args.rs') diff --git a/clap/examples/06_positional_args.rs b/clap/examples/06_positional_args.rs new file mode 100644 index 0000000..1f29612 --- /dev/null +++ b/clap/examples/06_positional_args.rs @@ -0,0 +1,56 @@ +extern crate clap; + +use clap::{App, Arg}; + +fn main() { + + // Positional arguments are those values after the program name which are not preceded by any + // identifier (such as "myapp some_file"). Positionals support many of the same options as + // flags, as well as a few additional ones. + let matches = App::new("MyApp") + // Regular App configuration goes here... + + // We'll add two positional arguments, a input file, and a config file. + // + // I'll explain each possible setting that "positionals" accept. Keep in + // mind that you DO NOT need to set each of these for every flag, only the + // ones that apply to your individual case. + .arg(Arg::with_name("input") + .help("the input file to use") // Displayed when showing help info + .index(1) // Set the order in which the user must + // specify this argument (Starts at 1) + .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>) + .required(true) // By default this argument MUST be present + // NOTE: mutual exclusions take precedence over + // required arguments + ) + .arg(Arg::with_name("config") + .help("the config file to use") + .index(2)) // Note, we do not need to specify required(true) + // if we don't want to, because "input" already + // requires "config" + // Note, we also do not need to specify requires("input") + // because requires lists are automatically two-way + + // NOTE: In order to compile this example, comment out conflicts_with() + // because we have not defined an "output" argument. + .get_matches(); + + // We can find out whether or not "input" or "config" were used + if matches.is_present("input") { + println!("An input file was specified"); + } + + // We can also get the values for those arguments + if let Some(in_file) = matches.value_of("input") { + // It's safe to call unwrap() because of the required options we set above + println!("Doing work with {} and {}", in_file, matches.value_of("config").unwrap()); + } + // Continued program logic goes here... +} -- cgit v1.2.1