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Update keyvalue example #234

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merged 2 commits into from
Aug 26, 2019
Merged

Update keyvalue example #234

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5b90c28
Update keyvalue example
lovasoa Aug 25, 2019
7bb0f4e
fix rustfmt
lovasoa Aug 25, 2019
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10 changes: 9 additions & 1 deletion examples/keyvalue.rs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
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,
Expand All @@ -16,7 +17,14 @@ where

#[derive(StructOpt, Debug)]
struct Opt {
#[structopt(short = "D", parse(try_from_str = parse_key_val))]
// 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)>,
}

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