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Diffstat (limited to 'structopt/examples/keyvalue.rs')
-rw-r--r-- | structopt/examples/keyvalue.rs | 36 |
1 files changed, 0 insertions, 36 deletions
diff --git a/structopt/examples/keyvalue.rs b/structopt/examples/keyvalue.rs deleted file mode 100644 index 12ce6fc..0000000 --- a/structopt/examples/keyvalue.rs +++ /dev/null @@ -1,36 +0,0 @@ -//! How to parse "key=value" pairs with structopt. - -use std::error::Error; -use structopt::StructOpt; - -/// Parse a single key-value pair -fn parse_key_val<T, U>(s: &str) -> Result<(T, U), Box<dyn Error>> -where - T: std::str::FromStr, - T::Err: Error + 'static, - U: std::str::FromStr, - U::Err: Error + 'static, -{ - let pos = s - .find('=') - .ok_or_else(|| format!("invalid KEY=value: no `=` found in `{}`", s))?; - Ok((s[..pos].parse()?, s[pos + 1..].parse()?)) -} - -#[derive(StructOpt, Debug)] -struct Opt { - // number_of_values = 1 forces the user to repeat the -D option for each key-value pair: - // my_program -D a=1 -D b=2 - // Without number_of_values = 1 you can do: - // my_program -D a=1 b=2 - // but this makes adding an argument after the values impossible: - // my_program -D a=1 -D b=2 my_input_file - // becomes invalid. - #[structopt(short = "D", parse(try_from_str = parse_key_val), number_of_values = 1)] - defines: Vec<(String, i32)>, -} - -fn main() { - let opt = Opt::from_args(); - println!("{:?}", opt); -} |