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Copy pathmain.rs
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85 lines (73 loc) · 2.14 KB
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// This file is part of the uutils diffutils package.
//
// For the full copyright and license information, please view the LICENSE-*
// files that was distributed with this source code.
use std::{
env::ArgsOs,
ffi::{OsStr, OsString},
iter::Peekable,
path::{Path, PathBuf},
process::ExitCode,
};
mod cmp;
mod context_diff;
mod diff;
mod ed_diff;
mod macros;
mod normal_diff;
mod params;
mod side_diff;
mod unified_diff;
mod utils;
/// # Panics
/// Panics if the binary path cannot be determined
fn binary_path(args: &mut Peekable<ArgsOs>) -> PathBuf {
match args.peek() {
Some(ref s) if !s.is_empty() => PathBuf::from(s),
_ => std::env::current_exe().unwrap(),
}
}
/// #Panics
/// Panics if path has no UTF-8 valid name
fn name(binary_path: &Path) -> &OsStr {
binary_path.file_stem().unwrap()
}
const VERSION: &str = env!("CARGO_PKG_VERSION");
fn usage(name: &str) {
println!("{name} {VERSION} (multi-call binary)\n");
println!("Usage: {name} [function [arguments...]]\n");
println!("Currently defined functions:\n");
println!(" cmp, diff\n");
}
fn second_arg_error(name: &OsStr) -> ! {
eprintln!("Expected utility name as second argument, got nothing.");
usage(&name.to_string_lossy());
std::process::exit(0);
}
fn main() -> ExitCode {
let mut args = std::env::args_os().peekable();
let exe_path = binary_path(&mut args);
let exe_name = name(&exe_path);
let util_name = if exe_name.as_encoded_bytes().ends_with(b"diffutils") {
// Discard the item we peeked.
let _ = args.next();
args.peek()
.cloned()
.unwrap_or_else(|| second_arg_error(exe_name))
} else {
OsString::from(exe_name)
};
match util_name.as_encoded_bytes() {
name if name.ends_with(b"diff") => diff::main(args),
name if name.ends_with(b"cmp") => cmp::main(args),
name => {
use std::io::{stderr, Write as _};
let _ = writeln!(
stderr(),
"{}: utility not supported",
String::from_utf8_lossy(name)
);
ExitCode::from(2)
}
}
}