| commit | ee79bb837806844b96548e1b5488f22cfb7f67f6 | [log] [tgz] |
|---|---|---|
| author | android-build-team Robot <[email protected]> | Tue Mar 16 03:34:18 2021 +0000 |
| committer | android-build-team Robot <[email protected]> | Tue Mar 16 03:34:18 2021 +0000 |
| tree | b80ba6ef708bb85f1c4764f4cda4822b09dd6fcf | |
| parent | 29c4a8d141d4fb8b82008e528a2a044157079a6a [diff] | |
| parent | 8e53541450302c45e45876e1f87da432061e2375 [diff] |
Snap for 7209903 from 8e53541450302c45e45876e1f87da432061e2375 to sc-d1-release Change-Id: I0abb8cd9a2cfcb8fe0db43446137a6fcd5904cb6
Parse command line arguments by defining a struct. It combines clap with custom derive.
Find it on Docs.rs. You can also check the examples and the changelog.
Add structopt to your dependencies of your Cargo.toml:
[dependencies] structopt = "0.3"
And then, in your rust file:
use std::path::PathBuf; use structopt::StructOpt; /// A basic example #[derive(StructOpt, Debug)] #[structopt(name = "basic")] struct Opt { // A flag, true if used in the command line. Note doc comment will // be used for the help message of the flag. The name of the // argument will be, by default, based on the name of the field. /// Activate debug mode #[structopt(short, long)] debug: bool, // The number of occurrences of the `v/verbose` flag /// Verbose mode (-v, -vv, -vvv, etc.) #[structopt(short, long, parse(from_occurrences))] verbose: u8, /// Set speed #[structopt(short, long, default_value = "42")] speed: f64, /// Output file #[structopt(short, long, parse(from_os_str))] output: PathBuf, // the long option will be translated by default to kebab case, // i.e. `--nb-cars`. /// Number of cars #[structopt(short = "c", long)] nb_cars: Option<i32>, /// admin_level to consider #[structopt(short, long)] level: Vec<String>, /// Files to process #[structopt(name = "FILE", parse(from_os_str))] files: Vec<PathBuf>, } fn main() { let opt = Opt::from_args(); println!("{:#?}", opt); }
Using this example:
$ ./basic
error: The following required arguments were not provided:
--output <output>
USAGE:
basic --output <output> --speed <speed>
For more information try --help
$ ./basic --help
basic 0.3.0
Guillaume Pinot <[email protected]>, others
A basic example
USAGE:
basic [FLAGS] [OPTIONS] --output <output> [--] [file]...
FLAGS:
-d, --debug Activate debug mode
-h, --help Prints help information
-V, --version Prints version information
-v, --verbose Verbose mode (-v, -vv, -vvv, etc.)
OPTIONS:
-l, --level <level>... admin_level to consider
-c, --nb-cars <nb-cars> Number of cars
-o, --output <output> Output file
-s, --speed <speed> Set speed [default: 42]
ARGS:
<file>... Files to process
$ ./basic -o foo.txt
Opt {
debug: false,
verbose: 0,
speed: 42.0,
output: "foo.txt",
nb_cars: None,
level: [],
files: [],
}
$ ./basic -o foo.txt -dvvvs 1337 -l alice -l bob --nb-cars 4 bar.txt baz.txt
Opt {
debug: true,
verbose: 3,
speed: 1337.0,
output: "foo.txt",
nb_cars: Some(
4,
),
level: [
"alice",
"bob",
],
files: [
"bar.txt",
"baz.txt",
],
}
cargo update will not fail on StructOpt).Licensed under either of
at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.