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|
mod args;
use std::process::ExitCode;
fn guess_parser(args: &mut dyn Iterator<Item = String>) -> Box<dyn args::Parser> {
for arg in args {
if arg.len() > 2 && arg.starts_with("--") {
// --C.. can only be ShortAndLong
return Box::new(args::ShortAndLongParser::new());
}
}
// TODO: Can we make more guesses?
Box::new(args::LongOnlyParser::new())
}
fn parse_args() -> Result<bool, String> {
let mut options = args::Options::new();
let help_idx = options.push(
args::OptionBuilder::default()
.short('h')
.long("help")
.description("display this and exit")
.build()
.unwrap(),
);
let version_idx = options.push(
args::OptionBuilder::default()
.short('V')
.long("version")
.description("display version and exit")
.build()
.unwrap(),
);
let verbose_idx = options.push(
args::OptionBuilder::default()
.long("verbose")
.description("be verbose")
.build()
.unwrap(),
);
let parser = guess_parser(&mut std::env::args());
let maybe_args = parser.run(&mut options, &mut std::env::args());
// help is special, check for it even if parser#run returned error.
let ref help = options[help_idx];
if help.is_set() {
parser.print_help(&options);
return Ok(true);
}
let args = maybe_args?;
let ref version = options[version_idx];
if version.is_set() {
println!("Version is 0.0.1");
return Ok(true);
}
let ref verbose = options[verbose_idx];
println!("verbose: {}", verbose.is_set());
println!("args: {:?}", args.args);
Ok(false)
}
fn main() -> ExitCode {
match parse_args() {
Ok(exit) => {
if exit {
return ExitCode::SUCCESS;
}
}
Err(msg) => {
eprintln!("{}", msg);
return ExitCode::FAILURE;
}
}
ExitCode::SUCCESS
}
|
