ls: Fix printing paths behavior

For any commandline arguments, ls should print the argument as is (and
not truncate to just the file name)
For any other files it reaches (say through recursive exploration), ls
should print just the filename (as path is printed once when we enter
the directory)

src/uu/ls/src/ls.rs

@@ -1110,7 +1110,7 @@ struct PathData {
     md: OnceCell<Option<Metadata>>,
     ft: OnceCell<Option<FileType>>,
     // Name of the file - will be empty for . or ..
-    file_name: String,
+    display_name: String,
     // PathBuf that all above data corresponds to
     p_buf: PathBuf,
     must_dereference: bool,
@@ -1126,14 +1126,18 @@ impl PathData {
     ) -> Self {
         // We cannot use `Path::ends_with` or `Path::Components`, because they remove occurrences of '.'
         // For '..', the filename is None
-        let name = if let Some(name) = file_name {
+        let display_name = if let Some(name) = file_name {
             name
+        } else {
+            let display_osstr = if command_line {
+                p_buf.as_os_str()
             } else {
                 p_buf
                     .file_name()
                     .unwrap_or_else(|| p_buf.iter().next_back().unwrap())
-                .to_string_lossy()
-                .into_owned()
+            };
+
+            display_osstr.to_string_lossy().into_owned()
         };
         let must_dereference = match &config.dereference {
             Dereference::All => true,
@@ -1159,7 +1163,7 @@ impl PathData {
         Self {
             md: OnceCell::new(),
             ft,
-            file_name: name,
+            display_name,
             p_buf,
             must_dereference,
         }
@@ -1243,7 +1247,7 @@ fn sort_entries(entries: &mut Vec<PathData>, config: &Config) {
             entries.sort_by_key(|k| Reverse(k.md().as_ref().map(|md| md.len()).unwrap_or(0)))
         }
         // The default sort in GNU ls is case insensitive
-        Sort::Name => entries.sort_by(|a, b| a.file_name.cmp(&b.file_name)),
+        Sort::Name => entries.sort_by(|a, b| a.display_name.cmp(&b.display_name)),
         Sort::Version => entries.sort_by(|a, b| version_cmp::version_cmp(&a.p_buf, &b.p_buf)),
         Sort::Extension => entries.sort_by(|a, b| {
             a.p_buf
@@ -1719,7 +1723,7 @@ fn classify_file(path: &PathData) -> Option<char> {
 }
 
 fn display_file_name(path: &PathData, config: &Config) -> Option<Cell> {
-    let mut name = escape_name(&path.file_name, &config.quoting_style);
+    let mut name = escape_name(&path.display_name, &config.quoting_style);
 
     #[cfg(unix)]
     {