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display help on empty command line arguments

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This commit is contained in:
Mikhail Babenko 2019-11-13 04:27:43 +03:00
parent 79d3b30cd7
commit 227dc44aee
1 changed files with 2 additions and 2 deletions
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4
src/driver.rs
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@ -268,14 +268,14 @@ pub fn main() {
// Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument. // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
// We're invoking the compiler programmatically, so we ignore this/ // We're invoking the compiler programmatically, so we ignore this/
let wrapper_mode = Path::new(&orig_args[1]).file_stem() == Some("rustc".as_ref()); let wrapper_mode = orig_args.get(1).map(Path::new).and_then(Path::file_stem) == Some("rustc".as_ref());
if wrapper_mode { if wrapper_mode {
// we still want to be able to invoke it normally though // we still want to be able to invoke it normally though
orig_args.remove(1); orig_args.remove(1);
} }
if !wrapper_mode && std::env::args().any(|a| a == "--help" || a == "-h") { if !wrapper_mode && (orig_args.iter().any(|a| a == "--help" || a == "-h") || orig_args.len() == 1) {
display_help(); display_help();
exit(0); exit(0);
} }