mirror of
https://github.com/clap-rs/clap
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0cc2f69839
Breaking Change Instead of requiring a Vec<&str> for various Arg::*_all() and Arg::possible_values() methods this commit now requires a generic IntoIterator<Item=AsRef<str>> which allows things such as constant arrays. This change requires that any Arg::*_all() methods be changed from vec!["val", "val"] -> let vals = ["val", "val"]; some_arg.possible_values(&vals) (or vals.iter()). Closes #87
58 lines
No EOL
1.6 KiB
Rust
58 lines
No EOL
1.6 KiB
Rust
// If you require more complex configuration than simple_enum! provides, you can implement the
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// trait manually, as in the following example.
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//
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// In the following example we will create an enum with 4 values, assign a positional argument
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// that accepts only one of those values, and use clap to parse the argument.
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//
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// Start with bringing the trait into scope.
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use std::str::FromStr;
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// Add clap like normal
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#[macro_use]
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extern crate clap;
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use clap::{App, Arg};
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// Define your enum
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enum Vals {
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Foo,
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Bar,
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Baz,
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Qux
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}
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// Implement the trait
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impl FromStr for Vals {
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type Err = &'static str;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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match s {
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"Foo" => Ok(Vals::Foo),
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"Bar" => Ok(Vals::Bar),
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"Baz" => Ok(Vals::Baz),
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"Qux" => Ok(Vals::Qux),
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_ => Err("no match")
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}
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}
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}
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fn main() {
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// Create the application like normal
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let enum_vals = ["Foo", "Bar", "Baz", "Qux"];
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let m = App::new("myapp")
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// Use a single positional argument that is required
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.arg(Arg::from_usage("<type> 'The type to use'")
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// Define the list of possible values
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.possible_values(&enum_vals))
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.get_matches();
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let t = value_t_or_exit!(m.value_of("type"), Vals);
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// Now we can use our enum like normal.
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match t {
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Vals::Foo => println!("Found a Foo"),
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Vals::Bar => println!("Found a Bar"),
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Vals::Baz => println!("Found a Baz"),
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Vals::Qux => println!("Found a Qux")
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}
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} |