63 lines
1.6 KiB
Rust
63 lines
1.6 KiB
Rust
//! How to use `required_if` with structopt.
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//!
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//! Running this example with --help prints this message:
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//! -----------------------------------------------------
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//! structopt 0.3.25
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//!
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//! USAGE:
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//! required_if -o <out-type> [FILE]
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//!
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//! FLAGS:
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//! -h, --help Prints help information
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//! -V, --version Prints version information
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//!
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//! OPTIONS:
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//! -o <out-type> Where to write the output: to `stdout` or `file`
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//!
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//! ARGS:
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//! <FILE> File name: only required when `out-type` is set to `file`
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//! -----------------------------------------------------
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use structopt::StructOpt;
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#[derive(Debug, StructOpt, PartialEq)]
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struct Opt {
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/// Where to write the output: to `stdout` or `file`
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#[structopt(short)]
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out_type: String,
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/// File name: only required when `out-type` is set to `file`
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#[structopt(name = "FILE", required_if("out-type", "file"))]
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file_name: Option<String>,
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}
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fn main() {
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let opt = Opt::from_args();
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println!("{:?}", opt);
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_opt_out_type_file_without_file_name_returns_err() {
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let opt = Opt::from_iter_safe(&["test", "-o", "file"]);
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let err = opt.unwrap_err();
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assert_eq!(err.kind, clap::ErrorKind::MissingRequiredArgument);
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}
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#[test]
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fn test_opt_out_type_file_with_file_name_returns_ok() {
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let opt = Opt::from_iter_safe(&["test", "-o", "file", "filename"]);
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let opt = opt.unwrap();
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assert_eq!(
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opt,
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Opt {
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out_type: "file".into(),
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file_name: Some("filename".into()),
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}
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);
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}
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}
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