feat(cli): Add --auto-compress option to stdio subcommand

This commit adds the `--auto-compress` and `-a` options to the `stdio` subcommand to improve compatibility with `bsdtar`.

The new options are accepted but have no effect, and a warning is logged to the console when they are used. An integration test has been added to verify the new behavior.

Author: google-labs-jules[bot]

Cargo.lock

@@ -74,6 +74,7 @@ criterion = { version = "0.7.0", default-features = false, features = ["cargo_be
 
 [target.'cfg(not(target_family = "wasm"))'.dev-dependencies]
 assert_cmd = "2.1.1"
+predicates = "3.1.2"
 
 [features]
 acl = [

cli/Cargo.toml

@@ -403,6 +403,8 @@ pub(crate) struct StdioCommand {
     safe_writes: bool,
     #[arg(long, hide = true)]
     no_safe_writes: bool,
+    #[arg(short = 'a', long = "auto-compress", hide = true)]
+    auto_compress: bool,
     #[arg(long, action = clap::ArgAction::Version, help = "Print version")]
     version: (),
     #[arg(long, action = clap::ArgAction::Help, help = "Print help")]
@@ -442,6 +444,9 @@ fn run_stdio(args: StdioCommand) -> anyhow::Result<()> {
             "Warning: Option '--no-safe-writes' is accepted for compatibility but will be ignored."
         );
     }
+    if args.auto_compress {
+        log::warn!("Option '--auto-compress' is accepted for compatibility but will be ignored.");
+    }
     if args.create {
         run_create_archive(args)
     } else if args.extract {

cli/src/command/stdio.rs

@@ -1,4 +1,5 @@
 mod exclude_vcs;
 mod files_from;
+mod option_auto_compress;
 mod strip_components;
 mod unlink_first;

cli/tests/cli/stdio.rs

@@ -0,0 +1,43 @@
+#![cfg(not(target_family = "wasm"))]
+use crate::utils::setup;
+use assert_cmd::cargo::cargo_bin_cmd;
+use predicates::prelude::predicate;
+use std::fs;
+
+#[test]
+fn stdio_auto_compress_option() {
+    setup();
+    let file = "stdio_auto_compress_option.txt";
+    fs::write(file, "").unwrap();
+
+    let mut cmd = cargo_bin_cmd!("pna");
+    cmd.arg("experimental")
+        .arg("stdio")
+        .arg("-c")
+        .arg("--auto-compress")
+        .arg(file)
+        .assert()
+        .success()
+        .stderr(predicate::str::contains(
+            "Option '--auto-compress' is accepted for compatibility but will be ignored.",
+        ));
+}
+
+#[test]
+fn stdio_a_option() {
+    setup();
+    let file = "stdio_a_option.txt";
+    fs::write(file, "").unwrap();
+
+    let mut cmd = cargo_bin_cmd!("pna");
+    cmd.arg("experimental")
+        .arg("stdio")
+        .arg("-c")
+        .arg("-a")
+        .arg(file)
+        .assert()
+        .success()
+        .stderr(predicate::str::contains(
+            "Option '--auto-compress' is accepted for compatibility but will be ignored.",
+        ));
+}