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echo: fixed double hyphen as argument (#7581)

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* Fixes #7558 Added check to only insert addition double hyphen if at start of arguments to correctly prepend addition hyphens for clap as well as additional test case

* additional comment

* fixes issue where flags precedes "--" as arguments
This commit is contained in:
cerdelen 2025-03-28 13:31:48 +01:00 • committed by GitHub
parent 1c75854d2f
commit 8c8beb96e4
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GPG key ID: B5690EEEBB952194
2 changed files with 121 additions and 6 deletions
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22
src/uu/echo/src/echo.rs
View file

@ -23,19 +23,33 @@ mod options {
pub const DISABLE_BACKSLASH_ESCAPE: &str = "disable_backslash_escape";
}
fn is_echo_flag(arg: &OsString) -> bool {
matches!(arg.to_str(), Some("-e" | "-E" | "-n"))
}
// A workaround because clap interprets the first '--' as a marker that a value
// follows. In order to use '--' as a value, we have to inject an additional '--'
fn handle_double_hyphens(args: impl uucore::Args) -> impl uucore::Args {
let mut result = Vec::new();
let mut is_first_double_hyphen = true;
let mut is_first_argument = true;
let mut args_iter = args.into_iter();
for arg in args {
if arg == "--" && is_first_double_hyphen {
if let Some(first_val) = args_iter.next() {
// the first argument ('echo') gets pushed before we start with the checks for flags/'--'
result.push(first_val);
// We need to skip any possible Flag arguments until we find the first argument to echo that
// is not a flag. If the first argument is double hyphen we inject an additional '--'
// otherwise we switch is_first_argument boolean to skip the checks for any further arguments
for arg in args_iter {
if is_first_argument && !is_echo_flag(&arg) {
is_first_argument = false;
if arg == "--" {
result.push(OsString::from("--"));
is_first_double_hyphen = false;
}
}
result.push(arg);
}
}
result.into_iter()
}

101
tests/by-util/test_echo.rs
View file

@ -242,6 +242,84 @@ fn test_hyphen_values_between() {
.stdout_is("dumdum dum dum dum -e dum\n");
}
#[test]
fn test_double_hyphens_at_start() {
new_ucmd!().arg("--").succeeds().stdout_only("--\n");
new_ucmd!()
.arg("--")
.arg("--")
.succeeds()
.stdout_only("-- --\n");
new_ucmd!()
.arg("--")
.arg("a")
.succeeds()
.stdout_only("-- a\n");
new_ucmd!()
.arg("--")
.arg("a")
.arg("b")
.succeeds()
.stdout_only("-- a b\n");
new_ucmd!()
.arg("--")
.arg("a")
.arg("b")
.arg("--")
.succeeds()
.stdout_only("-- a b --\n");
}
#[test]
fn test_double_hyphens_after_flags() {
new_ucmd!()
.arg("-e")
.arg("--")
.succeeds()
.stdout_only("--\n");
new_ucmd!()
.arg("-n")
.arg("-e")
.arg("--")
.arg("foo\n")
.succeeds()
.stdout_only("-- foo\n");
new_ucmd!()
.arg("-e")
.arg("--")
.arg("--")
.succeeds()
.stdout_only("-- --\n");
new_ucmd!()
.arg("-e")
.arg("--")
.arg("a")
.arg("--")
.succeeds()
.stdout_only("-- a --\n");
new_ucmd!()
.arg("-n")
.arg("--")
.arg("a")
.succeeds()
.stdout_only("-- a");
new_ucmd!()
.arg("-n")
.arg("--")
.arg("a")
.arg("--")
.succeeds()
.stdout_only("-- a --");
}
#[test]
fn test_double_hyphens() {
new_ucmd!().arg("--").succeeds().stdout_only("--\n");
@ -250,6 +328,29 @@ fn test_double_hyphens() {
.arg("--")
.succeeds()
.stdout_only("-- --\n");
new_ucmd!()
.arg("a")
.arg("--")
.arg("b")
.succeeds()
.stdout_only("a -- b\n");
new_ucmd!()
.arg("a")
.arg("--")
.arg("b")
.arg("--")
.succeeds()
.stdout_only("a -- b --\n");
new_ucmd!()
.arg("a")
.arg("b")
.arg("--")
.arg("--")
.succeeds()
.stdout_only("a b -- --\n");
}
#[test]