ls: manages the COLOR and COLORTERM variables

Should fix GNU tests/ls/color-term.sh

src/uu/ls/src/ls.rs

@@ -3,7 +3,7 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
-// spell-checker:ignore (ToDO) somegroup nlink tabsize dired subdired dtype
+// spell-checker:ignore (ToDO) somegroup nlink tabsize dired subdired dtype colorterm
 
 use clap::{
     builder::{NonEmptyStringValueParser, ValueParser},
@@ -553,12 +553,43 @@ fn extract_time(options: &clap::ArgMatches) -> Time {
     }
 }
 
+// Some env variables can be passed
+// For now, we are only verifying if empty or not and known for TERM
+fn is_color_compatible_term() -> bool {
+    let is_term_set = std::env::var("TERM").is_ok();
+    let is_colorterm_set = std::env::var("COLORTERM").is_ok();
+
+    let term = std::env::var("TERM").unwrap_or_default();
+    let colorterm = std::env::var("COLORTERM").unwrap_or_default();
+
+    // Search function to manage the "*" into the data structure
+    let term_matches = |term: &str| -> bool {
+        uucore::colors::TERMS.iter().any(|&pattern| {
+            term == pattern
+                || (pattern.ends_with('*') && term.starts_with(&pattern[..pattern.len() - 1]))
+        })
+    };
+
+    if is_term_set && colorterm.is_empty() && is_colorterm_set && term.is_empty() {
+        return false;
+    }
+
+    if !term.is_empty() && !term_matches(&term) {
+        return false;
+    }
+    true
+}
+
 /// Extracts the color option to use based on the options provided.
 ///
 /// # Returns
 ///
 /// A boolean representing whether or not to use color.
 fn extract_color(options: &clap::ArgMatches) -> bool {
+    if !is_color_compatible_term() {
+        return false;
+    }
+
     match options.get_one::<String>(options::COLOR) {
         None => options.contains_id(options::COLOR),
         Some(val) => match val.as_str() {

tests/by-util/test_ls.rs

@@ -2,7 +2,7 @@
 //
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
-// spell-checker:ignore (words) READMECAREFULLY birthtime doesntexist oneline somebackup lrwx somefile somegroup somehiddenbackup somehiddenfile tabsize aaaaaaaa bbbb cccc dddddddd ncccc neee naaaaa nbcdef nfffff dired subdired tmpfs mdir
+// spell-checker:ignore (words) READMECAREFULLY birthtime doesntexist oneline somebackup lrwx somefile somegroup somehiddenbackup somehiddenfile tabsize aaaaaaaa bbbb cccc dddddddd ncccc neee naaaaa nbcdef nfffff dired subdired tmpfs mdir COLORTERM mexe
 
 #[cfg(any(unix, feature = "feat_selinux"))]
 use crate::common::util::expected_result;
@@ -3988,3 +3988,62 @@ fn test_ls_color_do_not_reset() {
         "\\u{1b}[0m\\u{1b}[01;34ma\\u{1b}[0m\\n\\u{1b}[01;34mb\\u{1b}[0m\\n"
     );
 }
+
+#[cfg(all(unix, feature = "chmod"))]
+#[test]
+fn test_term_colorterm() {
+    let scene = TestScenario::new(util_name!());
+    let at = &scene.fixtures;
+    at.touch("exe");
+    scene.ccmd("chmod").arg("+x").arg("exe").succeeds();
+
+    // Should show colors
+    let result = scene
+        .ucmd()
+        .arg("--color=always")
+        .env("LS_COLORS", "")
+        .env("TERM", "")
+        .succeeds();
+    assert_eq!(
+        result.stdout_str().trim().escape_default().to_string(),
+        "\\u{1b}[0m\\u{1b}[01;32mexe\\u{1b}[0m"
+    );
+
+    // Should show colors
+    let result = scene
+        .ucmd()
+        .arg("--color=always")
+        .env("LS_COLORS", "")
+        .env("COLORTERM", "")
+        .succeeds();
+    assert_eq!(
+        result.stdout_str().trim().escape_default().to_string(),
+        "\\u{1b}[0m\\u{1b}[01;32mexe\\u{1b}[0m"
+    );
+
+    // No colors
+    let result = scene
+        .ucmd()
+        .arg("--color=always")
+        .env("LS_COLORS", "")
+        .env("TERM", "")
+        .env("COLORTERM", "")
+        .succeeds();
+    assert_eq!(
+        result.stdout_str().trim().escape_default().to_string(),
+        "exe"
+    );
+
+    // No colors
+    let result = scene
+        .ucmd()
+        .arg("--color=always")
+        .env("LS_COLORS", "")
+        .env("TERM", "dumb")
+        .env("COLORTERM", "")
+        .succeeds();
+    assert_eq!(
+        result.stdout_str().trim().escape_default().to_string(),
+        "exe"
+    );
+}