fix(ptx): Align text wrapping behavior with GNU in traditional mode and add related test

In traditional mode (-G) with references enabled, `uutils/ptx` failed
to wrap long lines in the same way as the GNU `ptx` reference
implementation.

This was due to the layout algorithm operating on an incorrectly large
line width, as the space for the reference column was not being
subtracted from the total width budget.

This commit implements the correct line width adjustment by subtracting
the reference width. This aligns the wrapping behavior and
makes the output identical to GNU `ptx` for the tested cases.

Author: Misakait

src/uu/ptx/src/ptx.rs

@@ -224,7 +224,7 @@ fn get_config(matches: &clap::ArgMatches) -> UResult<Config> {
     }
     config.auto_ref = matches.get_flag(options::AUTO_REFERENCE);
     config.input_ref = matches.get_flag(options::REFERENCES);
-    config.right_ref &= matches.get_flag(options::RIGHT_SIDE_REFS);
+    config.right_ref = matches.get_flag(options::RIGHT_SIDE_REFS);
     config.ignore_case = matches.get_flag(options::IGNORE_CASE);
     if matches.contains_id(options::MACRO_NAME) {
         config.macro_name = matches
@@ -661,7 +661,7 @@ fn prepare_line_chunks(
 }
 
 fn write_traditional_output(
-    config: &Config,
+    config: &mut Config,
     file_map: &FileMap,
     words: &BTreeSet<WordRef>,
     output_filename: &OsStr,
@@ -677,6 +677,15 @@ fn write_traditional_output(
 
     let context_reg = Regex::new(&config.context_regex).unwrap();
 
+    if !config.right_ref {
+        let max_ref_len = if config.auto_ref {
+            get_auto_max_reference_len(words)
+        } else {
+            0
+        };
+        config.line_width -= max_ref_len;
+    }
+
     for word_ref in words {
         let file_map_value: &FileContent = file_map
             .get(&word_ref.filename)
@@ -722,6 +731,31 @@ fn write_traditional_output(
     Ok(())
 }
 
+fn get_auto_max_reference_len(words: &BTreeSet<WordRef>) -> usize {
+    //Get the maximum length of the reference field
+    let line_num = words
+        .iter()
+        .map(|w| {
+            if w.local_line_nr == 0 {
+                1
+            } else {
+                (w.local_line_nr as f64).log10() as usize + 1
+            }
+        })
+        .max()
+        .unwrap_or(0);
+
+    let filename_len = words
+        .iter()
+        .filter(|w| w.filename != "-")
+        .map(|w| w.filename.maybe_quote().to_string().len())
+        .max()
+        .unwrap_or(0);
+
+    // +1 for the colon
+    line_num + filename_len + 1
+}
+
 mod options {
     pub mod format {
         pub static ROFF: &str = "roff";
@@ -749,7 +783,7 @@ mod options {
 #[uucore::main]
 pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let matches = uucore::clap_localization::handle_clap_result(uu_app(), args)?;
-    let config = get_config(&matches)?;
+    let mut config = get_config(&matches)?;
 
     let input_files;
     let output_file: OsString;
@@ -783,7 +817,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let word_filter = WordFilter::new(&matches, &config)?;
     let file_map = read_input(&input_files).map_err_context(String::new)?;
     let word_set = create_word_set(&config, &word_filter, &file_map);
-    write_traditional_output(&config, &file_map, &word_set, &output_file)
+    write_traditional_output(&mut config, &file_map, &word_set, &output_file)
 }
 
 pub fn uu_app() -> Command {

tests/by-util/test_ptx.rs

@@ -57,6 +57,30 @@ fn test_truncation_no_extra_space_in_after() {
         .stdout_contains(".xx \"\" \"Rust\" \"is/\" \"\"");
 }
 
+#[test]
+fn gnu_ext_disabled_reference_calculation() {
+    let input = "Hello World Rust is good language";
+    let expected_output = concat!(
+        r#".xx "language" "" "Hello World Rust is good" "" ":1""#,
+        "\n",
+        r#".xx "" "Hello World" "Rust is good language" "" ":1""#,
+        "\n",
+        r#".xx "" "Hello" "World Rust is good language" "" ":1""#,
+        "\n",
+        r#".xx "" "Hello World Rust is" "good language" "" ":1""#,
+        "\n",
+        r#".xx "" "Hello World Rust" "is good language" "" ":1""#,
+        "\n",
+        r#".xx "" "Hello World Rust is good" "language" "" ":1""#,
+        "\n",
+    );
+    new_ucmd!()
+        .args(&["-G", "-A"])
+        .pipe_in(input)
+        .succeeds()
+        .stdout_only(expected_output);
+}
+
 #[test]
 fn gnu_ext_disabled_rightward_no_ref() {
     new_ucmd!()