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Merge pull request #206 from posix4e/usage

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Fix usage of the tool. Provide -h and --help
This commit is contained in:
cassiersg 2015-08-27 00:12:33 +02:00
commit 25650c2a8b
1 changed files with 22 additions and 4 deletions
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26
src/bin/rustfmt.rs
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@ -67,22 +67,40 @@ fn main() {
std::process::exit(0);
}
fn usage<S: Into<String>>(reason: S) {
print!("{}\n\r usage: rustfmt [-h Help] [--write-mode=[true/false]] <file_name>", reason.into());
std::process::exit(1);
}
fn determine_params<I>(args: I) -> (Vec<String>, WriteMode)
where I: Iterator<Item = String>
{
let prefix = "--write-mode=";
let arg_prefix = "-";
let write_mode_prefix = "--write-mode=";
let help_mode = "-h";
let long_help_mode = "--help";
let mut write_mode = WriteMode::Replace;
// The NewFile option currently isn't supported because it requires another
// parameter, but it can be added later.
let args = args.filter(|arg| {
if arg.starts_with(prefix) {
write_mode = FromStr::from_str(&arg[prefix.len()..]).expect("Unrecognized write mode");
let args:Vec<String> = args.filter(|arg| {
if arg.starts_with(write_mode_prefix) {
write_mode = FromStr::from_str(&arg[write_mode_prefix.len()..]).expect("Unrecognized write mode");
false
} else if arg.starts_with(help_mode) || arg.starts_with(long_help_mode) {
usage("");
false
} else if arg.starts_with(arg_prefix) {
usage("Invalid argument");
false
} else {
true
}
}).collect();
if args.len() < 2 {
usage("Please provide a file to be formatted");
}
(args, write_mode)
}