dircolors: implement --print-ls-colors

src/uu/dircolors/README.md

@@ -4,6 +4,7 @@ Create the test fixtures by writing the output of the GNU dircolors commands to
 
 ```
 $ dircolors --print-database > /PATH_TO_COREUTILS/tests/fixtures/dircolors/internal.expected
+$ dircolors --print-ls-colors > /PATH_TO_COREUTILS/tests/fixtures/dircolors/ls_colors.expected
 $ dircolors -b > /PATH_TO_COREUTILS/tests/fixtures/dircolors/bash_def.expected
 $ dircolors -c > /PATH_TO_COREUTILS/tests/fixtures/dircolors/csh_def.expected
 ```

src/uu/dircolors/src/dircolors.rs

@@ -21,6 +21,7 @@ mod options {
     pub const BOURNE_SHELL: &str = "bourne-shell";
     pub const C_SHELL: &str = "c-shell";
     pub const PRINT_DATABASE: &str = "print-database";
+    pub const PRINT_LS_COLORS: &str = "print-ls-colors";
     pub const FILE: &str = "FILE";
 }
 
@@ -39,6 +40,7 @@ use self::colors::INTERNAL_DB;
 pub enum OutputFmt {
     Shell,
     CShell,
+    Display,
     Unknown,
 }
 
@@ -76,7 +78,8 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     // clap provides .conflicts_with / .conflicts_with_all, but we want to
     // manually handle conflicts so we can match the output of GNU coreutils
     if (matches.is_present(options::C_SHELL) || matches.is_present(options::BOURNE_SHELL))
-        && matches.is_present(options::PRINT_DATABASE)
+        && (matches.is_present(options::PRINT_DATABASE)
+            || matches.is_present(options::PRINT_LS_COLORS))
     {
         return Err(UUsageError::new(
             1,
@@ -85,6 +88,13 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         ));
     }
 
+    if matches.is_present(options::PRINT_DATABASE) && matches.is_present(options::PRINT_LS_COLORS) {
+        return Err(UUsageError::new(
+            1,
+            "options --print-database and --print-ls-colors are mutually exclusive",
+        ));
+    }
+
     if matches.is_present(options::PRINT_DATABASE) {
         if !files.is_empty() {
             return Err(UUsageError::new(
@@ -100,12 +110,15 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         return Ok(());
     }
 
-    let mut out_format = OutputFmt::Unknown;
-    if matches.is_present(options::C_SHELL) {
-        out_format = OutputFmt::CShell;
+    let mut out_format = if matches.is_present(options::C_SHELL) {
+        OutputFmt::CShell
     } else if matches.is_present(options::BOURNE_SHELL) {
-        out_format = OutputFmt::Shell;
-    }
+        OutputFmt::Shell
+    } else if matches.is_present(options::PRINT_LS_COLORS) {
+        OutputFmt::Display
+    } else {
+        OutputFmt::Unknown
+    };
 
     if out_format == OutputFmt::Unknown {
         match guess_syntax() {
@@ -186,6 +199,12 @@ pub fn uu_app<'a>() -> Command<'a> {
                 .help("print the byte counts")
                 .display_order(3),
         )
+        .arg(
+            Arg::new(options::PRINT_LS_COLORS)
+                .long("print-ls-colors")
+                .help("output fully escaped colors for display")
+                .display_order(4),
+        )
         .arg(
             Arg::new(options::FILE)
                 .hide(true)
@@ -254,6 +273,7 @@ enum ParseState {
     Continue,
     Pass,
 }
+
 use std::collections::HashMap;
 use uucore::{format_usage, InvalidEncodingHandling};
 
@@ -262,11 +282,12 @@ where
     T: IntoIterator,
     T::Item: Borrow<str>,
 {
-    // 1440 > $(dircolors | wc -m)
-    let mut result = String::with_capacity(1440);
+    // 1790 > $(dircolors | wc -m)
+    let mut result = String::with_capacity(1790);
     match fmt {
         OutputFmt::Shell => result.push_str("LS_COLORS='"),
         OutputFmt::CShell => result.push_str("setenv LS_COLORS '"),
+        OutputFmt::Display => (),
         _ => unreachable!(),
     }
 
@@ -345,13 +366,25 @@ where
             }
             if state != ParseState::Pass {
                 if key.starts_with('.') {
-                    result.push_str(format!("*{}={}:", key, val).as_str());
+                    if *fmt == OutputFmt::Display {
+                        result.push_str(format!("\x1b[{1}m*{0}\t{1}\x1b[0m\n", key, val).as_str());
+                    } else {
+                        result.push_str(format!("*{}={}:", key, val).as_str());
+                    }
                 } else if key.starts_with('*') {
-                    result.push_str(format!("{}={}:", key, val).as_str());
+                    if *fmt == OutputFmt::Display {
+                        result.push_str(format!("\x1b[{1}m{0}\t{1}\x1b[0m\n", key, val).as_str());
+                    } else {
+                        result.push_str(format!("{}={}:", key, val).as_str());
+                    }
                 } else if lower == "options" || lower == "color" || lower == "eightbit" {
                     // Slackware only. Ignore
                 } else if let Some(s) = table.get(lower.as_str()) {
-                    result.push_str(format!("{}={}:", s, val).as_str());
+                    if *fmt == OutputFmt::Display {
+                        result.push_str(format!("\x1b[{1}m{0}\t{1}\x1b[0m\n", s, val).as_str());
+                    } else {
+                        result.push_str(format!("{}={}:", s, val).as_str());
+                    }
                 } else {
                     return Err(format!(
                         "{}:{}: unrecognized keyword {}",
@@ -367,6 +400,10 @@ where
     match fmt {
         OutputFmt::Shell => result.push_str("';\nexport LS_COLORS"),
         OutputFmt::CShell => result.push('\''),
+        OutputFmt::Display => {
+            // remove latest "\n"
+            result.pop();
+        }
         _ => unreachable!(),
     }
 

tests/by-util/test_dircolors.rs

@@ -62,6 +62,14 @@ fn test_internal_db() {
         .stdout_is_fixture("internal.expected");
 }
 
+#[test]
+fn test_ls_colors() {
+    new_ucmd!()
+        .arg("--print-ls-colors")
+        .run()
+        .stdout_is_fixture("ls_colors.expected");
+}
+
 #[test]
 fn test_bash_default() {
     new_ucmd!()
@@ -109,6 +117,18 @@ fn test_exclusive_option() {
         .arg("-cp")
         .fails()
         .stderr_contains("mutually exclusive");
+    new_ucmd!()
+        .args(&["-b", "--print-ls-colors"])
+        .fails()
+        .stderr_contains("mutually exclusive");
+    new_ucmd!()
+        .args(&["-c", "--print-ls-colors"])
+        .fails()
+        .stderr_contains("mutually exclusive");
+    new_ucmd!()
+        .args(&["-p", "--print-ls-colors"])
+        .fails()
+        .stderr_contains("mutually exclusive");
 }
 
 fn test_helper(file_name: &str, term: &str) {

tests/fixtures/dircolors/ls_colors.expected

@@ -0,0 +1,148 @@
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