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use clap::{crate_version, App, Arg};
use std::env;
static ABOUT: &str = "Display the values of the specified environment VARIABLE(s), or (with no VARIABLE) display name and value pairs for them all.";
static OPT_NULL: &str = "null";
static ARG_VARIABLES: &str = "variables";
fn usage() -> String {
format!("{0} [VARIABLE]... [OPTION]...", uucore::execution_phrase())
}
pub fn uumain(args: impl uucore::Args) -> i32 {
let usage = usage();
let matches = uu_app().usage(&usage[..]).get_matches_from(args);
let variables: Vec<String> = matches
.values_of(ARG_VARIABLES)
.map(|v| v.map(ToString::to_string).collect())
.unwrap_or_default();
let separator = if matches.is_present(OPT_NULL) {
"\x00"
} else {
"\n"
};
if variables.is_empty() {
for (env_var, value) in env::vars() {
print!("{}={}{}", env_var, value, separator);
}
return 0;
}
for env_var in variables {
if let Ok(var) = env::var(env_var) {
print!("{}{}", var, separator);
}
}
0
}
pub fn uu_app() -> App<'static, 'static> {
App::new(uucore::util_name())
.version(crate_version!())
.about(ABOUT)
.arg(
Arg::with_name(OPT_NULL)
.short("0")
.long(OPT_NULL)
.help("end each output line with 0 byte rather than newline"),
)
.arg(
Arg::with_name(ARG_VARIABLES)
.multiple(true)
.takes_value(true)
.min_values(1),
)
}