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Add differentiation of required opts in usage() #49

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Add differentiation of required opts in usage() #49

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22 changes: 18 additions & 4 deletions gumdrop_derive/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1811,11 +1811,25 @@ fn make_usage(help: &Option<String>, free: &[FreeOpt], opts: &[Opt]) -> String {
res.push('\n');
}

res.push_str("Optional arguments:\n");
let (required,optional): (Vec<&Opt>,Vec<&Opt>) =
opts.iter().partition(|o| o.required);

for opt in opts {
res.push_str(&opt.usage(width));
res.push('\n');
if !required.is_empty() {
res.push_str("Required arguments:\n");

for opt in required {
res.push_str(&opt.usage(width));
res.push('\n');
}
}

if !optional.is_empty() {
res.push_str("Optional arguments:\n");

for opt in optional {
res.push_str(&opt.usage(width));
res.push('\n');
}
}
}

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