aboutsummaryrefslogtreecommitdiff
path: root/structopt/examples/keyvalue.rs
diff options
context:
space:
mode:
Diffstat (limited to 'structopt/examples/keyvalue.rs')
-rw-r--r--structopt/examples/keyvalue.rs36
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);
-}