ls: remove case-insensitivity and leading period of name sort

src/uu/ls/BENCHMARKING.md

@@ -36,6 +36,8 @@ args="$@"
 hyperfine "ls $args" "target/release/coreutils ls $args"
 ```
 
+**Note**: No localization is currently implemented. This means that the comparison above is not really fair. We can fix this by setting `LC_ALL=C`, so GNU `ls` can ignore localization.
+
 ## Checking system call count
 
 - Another thing to look at would be system calls count using strace (on linux) or equivalent on other operating systems.

src/uu/ls/src/ls.rs

@@ -1244,14 +1244,8 @@ 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_cached_key(|k| {
-            let has_dot: bool = k.file_name.starts_with('.');
-            let filename_nodot: &str = &k.file_name[if has_dot { 1 } else { 0 }..];
-            // We want hidden files to appear before regular files of the same
-            // name, so we need to negate the "has_dot" variable.
-            (filename_nodot.to_lowercase(), !has_dot)
-        }),
-        Sort::Version => entries.sort_by(|k, j| version_cmp::version_cmp(&k.p_buf, &j.p_buf)),
+        Sort::Name => entries.sort_by(|a, b| a.file_name.cmp(&b.file_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
                 .extension()

tests/by-util/test_ls.rs

@@ -527,7 +527,6 @@ fn test_ls_sort_name() {
         .succeeds()
         .stdout_is(["test-1", "test-2", "test-3\n"].join(sep));
 
-    // Order of a named sort ignores leading dots.
     let scene_dot = TestScenario::new(util_name!());
     let at = &scene_dot.fixtures;
     at.touch(".a");
@@ -540,7 +539,7 @@ fn test_ls_sort_name() {
         .arg("--sort=name")
         .arg("-A")
         .succeeds()
-        .stdout_is([".a", "a", ".b", "b\n"].join(sep));
+        .stdout_is([".a", ".b", "a", "b\n"].join(sep));
 }
 
 #[test]