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corrections on README.md

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Guillaume P 2017-02-10 01:28:00 +01:00 committed by GitHub
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@ -79,8 +79,8 @@ Opt { debug: true, speed: 1337, input: "foo", output: Some("bar") }
## Why
I use [docopt](https://crates.io/crates/docopt) since long time. I really like the fact that you have a structure with the parsed argumentThat's like going back to the : no need to convert `String` to `f64`, no useless `unwrap`. But in another hand, I don't like to write by hand the usage string. That's like going back to the golden age of WYSIWYG editors.
I use [docopt](https://crates.io/crates/docopt) since a long time (pre rust 1.0). I really like the fact that you have a structure with the parsed argument: no need to convert `String` to `f64`, no useless `unwrap`. But on the other hand, I don't like to write by hand the usage string. That's like going back to the golden age of WYSIWYG editors. Field naming is also a bit artificial.
Today, the new standard to read command line arguments in Rust is [clap](https://crates.io/crates/clap). This library is so feature full! But I think there is one downside: even if you can validate arument, expressing that an argument is required, you still need to transform something looking like a hashmap of string vectors to something useful for your application.
Today, the new standard to read command line arguments in Rust is [clap](https://crates.io/crates/clap). This library is so feature full! But I think there is one downside: even if you can validate argument and expressing that an argument is required, you still need to transform something looking like a hashmap of string vectors to something useful for your application.
Now, there is stable custom derive. Thus I can add to clap the automatic conversion that I miss. Here is the result.