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coreutils/src/bin/coreutils.rs

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// This file is part of the uutils coreutils package.
//
// (c) Michael Gehring <mg@ebfe.org>
//
// For the full copyright and license information, please view the LICENSE
// file that was distributed with this source code.
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extern crate textwrap;
extern crate uucore;
use std::cmp;
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use std::collections::hash_map::HashMap;
use std::ffi::OsString;
use std::io::{self, Write};
use std::path::{Path, PathBuf};
use std::process;
const VERSION: &str = env!("CARGO_PKG_VERSION");
include!(concat!(env!("OUT_DIR"), "/uutils_map.rs"));
fn usage<T>(utils: &UtilityMap<T>, name: &str) {
println!("{} {} (multi-call binary)\n", name, VERSION);
println!("Usage: {} [function [arguments...]]\n", name);
println!("Currently defined functions/utilities:\n");
#[allow(clippy::map_clone)]
let mut utils: Vec<&str> = utils.keys().map(|&s| s).collect();
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utils.sort();
let display_list = utils.join(", ");
let width = cmp::min(textwrap::termwidth(), 100) - 4 * 2; // (opinion/heuristic) max 100 chars wide with 4 character side indentions
println!(
"{}",
textwrap::indent(&textwrap::fill(&display_list, width), " ")
);
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}
fn binary_path(args: &mut impl Iterator<Item = OsString>) -> PathBuf {
match args.next() {
Some(s) if !s.is_empty() => PathBuf::from(s),
_ => std::env::current_exe().unwrap(),
}
}
fn name(binary_path: &Path) -> &str {
binary_path.file_stem().unwrap().to_str().unwrap()
}
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fn main() {
uucore::panic::mute_sigpipe_panic();
let utils = util_map();
let mut args = uucore::args_os();
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let binary = binary_path(&mut args);
let binary_as_util = name(&binary);
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// binary name equals util name?
if let Some(&uumain) = utils.get(binary_as_util) {
process::exit(uumain((vec![binary.into()].into_iter()).chain(args)));
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}
// binary name equals prefixed util name?
// * prefix/stem may be any string ending in a non-alphanumeric character
let utilname =
if let Some(util) = utils.keys().find(|util| {
binary_as_util.ends_with(*util)
&& !(&binary_as_util[..binary_as_util.len() - (*util).len()])
.ends_with(char::is_alphanumeric)
}) {
// prefixed util => replace 0th (aka, executable name) argument
Some(OsString::from(*util))
} else {
// unmatched binary name => regard as multi-binary container and advance argument list
args.next()
};
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// 0th argument equals util name?
if let Some(util_os) = utilname {
let util = util_os.as_os_str().to_string_lossy();
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match utils.get(&util[..]) {
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Some(&uumain) => {
process::exit(uumain((vec![util_os].into_iter()).chain(args)));
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}
None => {
if util == "--help" || util == "-h" {
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// see if they want help on a specific util
if let Some(util_os) = args.next() {
let util = util_os.as_os_str().to_string_lossy();
match utils.get(&util[..]) {
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Some(&uumain) => {
let code = uumain((vec![util_os, OsString::from("--help")].into_iter()).chain(args));
io::stdout().flush().expect("could not flush stdout");
process::exit(code);
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}
None => {
println!("{}: function/utility not found", util);
process::exit(1);
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}
}
}
usage(&utils, binary_as_util);
process::exit(0);
} else {
println!("{}: function/utility not found", util);
process::exit(1);
}
}
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}
} else {
// no arguments provided
usage(&utils, binary_as_util);
process::exit(0);
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}
}