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author | Robin Krahl <robin.krahl@ireas.org> | 2020-01-07 11:18:04 +0000 |
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committer | Daniel Mueller <deso@posteo.net> | 2020-01-08 09:20:25 -0800 |
commit | 5e20a29b4fdc8a2d442d1093681b396dcb4b816b (patch) | |
tree | 55ab083fa8999d2ccbb5e921c1ffe52560dca152 /clap/examples/11_only_specific_values.rs | |
parent | 203e691f46d591a2cc8acdfd850fa9f5b0fb8a98 (diff) | |
download | nitrocli-5e20a29b4fdc8a2d442d1093681b396dcb4b816b.tar.gz nitrocli-5e20a29b4fdc8a2d442d1093681b396dcb4b816b.tar.bz2 |
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
Diffstat (limited to 'clap/examples/11_only_specific_values.rs')
-rw-r--r-- | clap/examples/11_only_specific_values.rs | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/clap/examples/11_only_specific_values.rs b/clap/examples/11_only_specific_values.rs new file mode 100644 index 0000000..3445218 --- /dev/null +++ b/clap/examples/11_only_specific_values.rs @@ -0,0 +1,33 @@ +extern crate clap; + +use clap::{App, Arg}; + +fn main() { + // If you have arguments of specific values you want to test for, you can use the + // .possible_values() method of Arg + // + // This allows you specify the valid values for that argument. If the user does not use one of + // those specific values, they will receive a graceful exit with error message informing them + // of the mistake, and what the possible valid values are + // + // For this example, assume you want one positional argument of either "fast" or "slow" + // i.e. the only possible ways to run the program are "myprog fast" or "myprog slow" + let matches = App::new("myapp").about("does awesome things") + .arg(Arg::with_name("MODE") + .help("What mode to run the program in") + .index(1) + .possible_values(&["fast", "slow"]) + .required(true)) + .get_matches(); + + // Note, it's safe to call unwrap() because the arg is required + match matches.value_of("MODE").unwrap() { + "fast" => { + // Do fast things... + }, + "slow" => { + // Do slow things... + }, + _ => unreachable!() + } +} |