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extern crate exa;
use exa::Exa;
use std::ffi::OsString;
use std::env::{args_os, var_os};
use std::io::{stdout, stderr, Write, ErrorKind};
use std::process::exit;
fn main() {
configure_logger();
let args: Vec<OsString> = args_os().skip(1).collect();
match Exa::from_args(args.iter(), &mut stdout()) {
Ok(mut exa) => {
match exa.run() {
Ok(exit_status) => exit(exit_status),
Err(e) => {
match e.kind() {
ErrorKind::BrokenPipe => exit(exits::SUCCESS),
_ => {
eprintln!("{}", e);
exit(exits::RUNTIME_ERROR);
},
};
}
};
},
Err(ref e) if e.is_error() => {
let mut stderr = stderr();
writeln!(stderr, "{}", e).unwrap();
if let Some(s) = e.suggestion() {
let _ = writeln!(stderr, "{}", s);
}
exit(exits::OPTIONS_ERROR);
},
Err(ref e) => {
println!("{}", e);
exit(exits::SUCCESS);
},
};
}
/// Sets up a global logger if one is asked for.
/// The ‘EXA_DEBUG’ environment variable controls whether log messages are
/// displayed or not. Currently there are just two settings (on and off).
///
/// This can’t be done in exa’s own option parsing because that part of it
/// logs as well, so by the time execution gets there, the logger needs to
/// have already been set up.
pub fn configure_logger() {
extern crate env_logger;
extern crate log;
let present = match var_os(exa::vars::EXA_DEBUG) {
Some(debug) => debug.len() > 0,
None => false,
};
let mut logs = env_logger::Builder::new();
if present {
logs.filter(None, log::LevelFilter::Debug);
}
else {
logs.filter(None, log::LevelFilter::Off);
}
logs.init()
}
mod exits {
/// Exit code for when exa runs OK.
pub const SUCCESS: i32 = 0;
/// Exit code for when there was at least one I/O error during execution.
pub const RUNTIME_ERROR: i32 = 1;
/// Exit code for when the command-line options are invalid.
pub const OPTIONS_ERROR: i32 = 3;
}
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