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#[macro_use]
extern crate uucore;
use clap::{App, Arg};
use std::fs;
use std::io::{stdout, Write};
use std::path::PathBuf;
use uucore::fs::{canonicalize, CanonicalizeMode};
const NAME: &str = "readlink";
const VERSION: &str = env!("CARGO_PKG_VERSION");
const ABOUT: &str = "Print value of a symbolic link or canonical file name.";
const OPT_CANONICALIZE: &str = "canonicalize";
const OPT_CANONICALIZE_MISSING: &str = "canonicalize-missing";
const OPT_CANONICALIZE_EXISTING: &str = "canonicalize-existing";
const OPT_NO_NEWLINE: &str = "no-newline";
const OPT_QUIET: &str = "quiet";
const OPT_SILENT: &str = "silent";
const OPT_VERBOSE: &str = "verbose";
const OPT_ZERO: &str = "zero";
const ARG_FILES: &str = "files";
fn get_usage() -> String {
format!("{0} [OPTION]... [FILE]...", executable!())
}
pub fn uumain(args: impl uucore::Args) -> i32 {
let usage = get_usage();
let matches = App::new(executable!())
.version(VERSION)
.about(ABOUT)
.usage(&usage[..])
.arg(
Arg::with_name(OPT_CANONICALIZE)
.short("f")
.long(OPT_CANONICALIZE)
.help(
"canonicalize by following every symlink in every component of the \
given name recursively; all but the last component must exist",
),
)
.arg(
Arg::with_name(OPT_CANONICALIZE_EXISTING)
.short("e")
.long("canonicalize-existing")
.help(
"canonicalize by following every symlink in every component of the \
given name recursively, all components must exist",
),
)
.arg(
Arg::with_name(OPT_CANONICALIZE_MISSING)
.short("m")
.long(OPT_CANONICALIZE_MISSING)
.help(
"canonicalize by following every symlink in every component of the \
given name recursively, without requirements on components existence",
),
)
.arg(
Arg::with_name(OPT_NO_NEWLINE)
.short("n")
.long(OPT_NO_NEWLINE)
.help("do not output the trailing delimiter"),
)
.arg(
Arg::with_name(OPT_QUIET)
.short("q")
.long(OPT_QUIET)
.help("suppress most error messages"),
)
.arg(
Arg::with_name(OPT_SILENT)
.short("s")
.long(OPT_SILENT)
.help("suppress most error messages"),
)
.arg(
Arg::with_name(OPT_VERBOSE)
.short("v")
.long(OPT_VERBOSE)
.help("report error message"),
)
.arg(
Arg::with_name(OPT_ZERO)
.short("z")
.long(OPT_ZERO)
.help("separate output with NUL rather than newline"),
)
.arg(Arg::with_name(ARG_FILES).multiple(true).takes_value(true))
.get_matches_from(args);
let mut no_newline = matches.is_present(OPT_NO_NEWLINE);
let use_zero = matches.is_present(OPT_ZERO);
let silent = matches.is_present(OPT_SILENT) || matches.is_present(OPT_QUIET);
let verbose = matches.is_present(OPT_VERBOSE);
let can_mode = if matches.is_present(OPT_CANONICALIZE) {
CanonicalizeMode::Normal
} else if matches.is_present(OPT_CANONICALIZE_EXISTING) {
CanonicalizeMode::Existing
} else if matches.is_present(OPT_CANONICALIZE_MISSING) {
CanonicalizeMode::Missing
} else {
CanonicalizeMode::None
};
let files: Vec<String> = matches
.values_of(ARG_FILES)
.map(|v| v.map(ToString::to_string).collect())
.unwrap_or_default();
if files.is_empty() {
crash!(
1,
"missing operand\nTry {} --help for more information",
NAME
);
}
if no_newline && files.len() > 1 && !silent {
eprintln!("{}: ignoring --no-newline with multiple arguments", NAME);
no_newline = false;
}
for f in &files {
let p = PathBuf::from(f);
if can_mode == CanonicalizeMode::None {
match fs::read_link(&p) {
Ok(path) => show(&path, no_newline, use_zero),
Err(err) => {
if verbose {
eprintln!("{}: {}: errno {}", NAME, f, err.raw_os_error().unwrap());
}
return 1;
}
}
} else {
match canonicalize(&p, can_mode) {
Ok(path) => show(&path, no_newline, use_zero),
Err(err) => {
if verbose {
eprintln!("{}: {}: errno {:?}", NAME, f, err.raw_os_error().unwrap());
}
return 1;
}
}
}
}
0
}
fn show(path: &PathBuf, no_newline: bool, use_zero: bool) {
let path = path.as_path().to_str().unwrap();
if use_zero {
print!("{}\0", path);
} else if no_newline {
print!("{}", path);
} else {
println!("{}", path);
}
crash_if_err!(1, stdout().flush());
}