refactor/uucore ~ correct implementation of executable!() for multicall

- Use an atomic bool to track whether the utility name is the second
or the first argument.
- Add tests

src/bin/coreutils.rs

@@ -70,6 +70,7 @@ fn main() {
         Some(OsString::from(*util))
     } else {
         // unmatched binary name => regard as multi-binary container and advance argument list
+        uucore::set_utility_is_second_arg();
         args.next()
     };
 

src/uu/base32/src/base32.rs

@@ -38,7 +38,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     let name = util_name!();
 
     let config_result: Result<base_common::Config, String> =
-        base_common::parse_base_cmd_args(args, name, VERSION, ABOUT, &usage);
+        base_common::parse_base_cmd_args(args, &name, VERSION, ABOUT, &usage);
     let config = config_result.unwrap_or_else(|s| crash!(BASE_CMD_PARSE_ERROR, "{}", s));
 
     // Create a reference to stdin so we can return a locked stdin from
@@ -52,12 +52,12 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         config.wrap_cols,
         config.ignore_garbage,
         config.decode,
-        name,
+        &name,
     );
 
     0
 }
 
 pub fn uu_app() -> App<'static, 'static> {
-    base_common::base_app(util_name!(), VERSION, ABOUT)
+    base_common::base_app(&util_name!(), VERSION, ABOUT)
 }

src/uu/base64/src/base64.rs

@@ -38,7 +38,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     let usage = usage();
     let name = util_name!();
     let config_result: Result<base_common::Config, String> =
-        base_common::parse_base_cmd_args(args, name, VERSION, ABOUT, &usage);
+        base_common::parse_base_cmd_args(args, &name, VERSION, ABOUT, &usage);
     let config = config_result.unwrap_or_else(|s| crash!(BASE_CMD_PARSE_ERROR, "{}", s));
 
     // Create a reference to stdin so we can return a locked stdin from
@@ -52,7 +52,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         config.wrap_cols,
         config.ignore_garbage,
         config.decode,
-        name,
+        &name,
     );
 
     0

src/uucore/src/lib/lib.rs

@@ -77,6 +77,15 @@ pub use crate::features::wide;
 //## core functions
 
 use std::ffi::OsString;
+use std::sync::atomic::Ordering;
+
+pub fn get_utility_is_second_arg() -> bool {
+    crate::macros::UTILITY_IS_SECOND_ARG.load(Ordering::SeqCst)
+}
+
+pub fn set_utility_is_second_arg() {
+    crate::macros::UTILITY_IS_SECOND_ARG.store(true, Ordering::SeqCst)
+}
 
 pub enum InvalidEncodingHandling {
     Ignore,

src/uucore/src/lib/macros.rs

@@ -1,3 +1,5 @@
+use std::sync::atomic::AtomicBool;
+
 // This file is part of the uutils coreutils package.
 //
 // (c) Alex Lyon <arcterus@mail.com>
@@ -5,40 +7,22 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
+/// Whether we were called as a multicall binary ("coreutils <utility>")
+pub static UTILITY_IS_SECOND_ARG: AtomicBool = AtomicBool::new(false);
+
 /// Get the executable path (as `OsString`).
 #[macro_export]
 macro_rules! executable_os(
     () => ({
-        &uucore::args_os().next().unwrap()
+        $crate::args_os().next().unwrap()
     })
 );
 
-/// Get the executable path (as `String`; lossless).
+/// Get the executable path (as `String`).
 #[macro_export]
 macro_rules! executable(
     () => ({
-        let exe = match $crate::executable_os!().to_str() {
-            // * UTF-8
-            Some(s) => s.to_string(),
-            // * "lossless" debug format (if/when `executable_os!()` is not well-formed UTF-8)
-            None => format!("{:?}", $crate::executable_os!())
-        };
-        &exe.to_owned()
-    })
-);
-
-/// Get the executable name.
-#[macro_export]
-macro_rules! executable_name(
-    () => ({
-        let stem = &std::path::Path::new($crate::executable_os!()).file_stem().unwrap().to_owned();
-        let exe = match stem.to_str() {
-            // * UTF-8
-            Some(s) => s.to_string(),
-            // * "lossless" debug format (if/when `executable_os!()` is not well-formed UTF-8)
-            None => format!("{:?}", stem)
-        };
-        &exe.to_owned()
+        $crate::executable_os!().to_string_lossy().to_string()
     })
 );
 
@@ -46,13 +30,11 @@ macro_rules! executable_name(
 #[macro_export]
 macro_rules! util_name(
     () => ({
-        let crate_name = env!("CARGO_PKG_NAME");
-        let name = if crate_name.starts_with("uu_") {
-            &crate_name[3..]
+        if $crate::get_utility_is_second_arg() {
+            $crate::args_os().nth(1).unwrap().to_string_lossy().to_string()
         } else {
-            crate_name
-        };
-        &name.to_owned()
+            $crate::executable!()
+        }
     })
 );
 
@@ -62,14 +44,15 @@ macro_rules! util_name(
 #[macro_export]
 macro_rules! execution_phrase(
     () => ({
-        let exe = if (executable_name!() == util_name!()) {
-        executable!().to_string()
-    } else {
-        format!("{} {}", executable!(), util_name!())
-            .as_str()
-            .to_owned()
-    };
-    &exe.to_owned()
+        if $crate::get_utility_is_second_arg() {
+            $crate::args_os()
+            .take(2)
+            .map(|os_str| os_str.to_string_lossy().to_string())
+            .collect::<Vec<_>>()
+            .join(" ")
+        } else {
+            $crate::executable!()
+        }
     })
 );
 

tests/test_util_name.rs

@@ -0,0 +1,81 @@
+mod common;
+
+use common::util::TestScenario;
+
+#[test]
+#[cfg(feature = "ls")]
+fn execution_phrase_double() {
+    use std::process::Command;
+
+    let scenario = TestScenario::new("ls");
+    let output = Command::new(&scenario.bin_path)
+        .arg("ls")
+        .arg("--some-invalid-arg")
+        .output()
+        .unwrap();
+    assert!(String::from_utf8(output.stderr)
+        .unwrap()
+        .contains(&format!("USAGE:\n    {} ls", scenario.bin_path.display(),)));
+}
+
+#[test]
+#[cfg(feature = "ls")]
+fn execution_phrase_single() {
+    use std::process::Command;
+
+    let scenario = TestScenario::new("ls");
+    std::fs::copy(scenario.bin_path, scenario.fixtures.plus("uu-ls")).unwrap();
+    let output = Command::new(scenario.fixtures.plus("uu-ls"))
+        .arg("--some-invalid-arg")
+        .output()
+        .unwrap();
+    assert!(String::from_utf8(output.stderr).unwrap().contains(&format!(
+        "USAGE:\n    {}",
+        scenario.fixtures.plus("uu-ls").display()
+    )));
+}
+
+#[test]
+#[cfg(feature = "sort")]
+fn util_name_double() {
+    use std::{
+        io::Write,
+        process::{Command, Stdio},
+    };
+
+    let scenario = TestScenario::new("sort");
+    let mut child = Command::new(&scenario.bin_path)
+        .arg("sort")
+        .stdin(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()
+        .unwrap();
+    // input invalid utf8 to cause an error
+    child.stdin.take().unwrap().write_all(&[255]).unwrap();
+    let output = child.wait_with_output().unwrap();
+    assert!(String::from_utf8(output.stderr).unwrap().contains("sort: "));
+}
+
+#[test]
+#[cfg(feature = "sort")]
+fn util_name_single() {
+    use std::{
+        io::Write,
+        process::{Command, Stdio},
+    };
+
+    let scenario = TestScenario::new("sort");
+    std::fs::copy(scenario.bin_path, scenario.fixtures.plus("uu-sort")).unwrap();
+    let mut child = Command::new(scenario.fixtures.plus("uu-sort"))
+        .stdin(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()
+        .unwrap();
+    // input invalid utf8 to cause an error
+    child.stdin.take().unwrap().write_all(&[255]).unwrap();
+    let output = child.wait_with_output().unwrap();
+    assert!(String::from_utf8(output.stderr).unwrap().contains(&format!(
+        "{}: ",
+        scenario.fixtures.plus("uu-sort").display()
+    )));
+}