colored file-like completions (#11702)

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`ls` and other file completions uses `LS_COLORS`.

![maim-2024 01 31 21 34
31](https://github.com/nushell/nushell/assets/15631555/d5c3813f-77b5-4391-aa0b-4b2125e5aca5)


# User-Facing Changes
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---------

Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>

crates/nu-cli/src/completions/completer.rs

@@ -266,8 +266,10 @@ impl NuCompleter {
                                             || prev_expr_str == b"overlay use"
                                             || prev_expr_str == b"source-env"
                                         {
-                                            let mut completer =
-                                                DotNuCompletion::new(self.engine_state.clone());
+                                            let mut completer = DotNuCompletion::new(
+                                                self.engine_state.clone(),
+                                                self.stack.clone(),
+                                            );
 
                                             return self.process_completion(
                                                 &mut completer,
@@ -278,8 +280,10 @@ impl NuCompleter {
                                                 pos,
                                             );
                                         } else if prev_expr_str == b"ls" {
-                                            let mut completer =
-                                                FileCompletion::new(self.engine_state.clone());
+                                            let mut completer = FileCompletion::new(
+                                                self.engine_state.clone(),
+                                                self.stack.clone(),
+                                            );
 
                                             return self.process_completion(
                                                 &mut completer,
@@ -313,8 +317,10 @@ impl NuCompleter {
                                         );
                                     }
                                     FlatShape::Directory => {
-                                        let mut completer =
-                                            DirectoryCompletion::new(self.engine_state.clone());
+                                        let mut completer = DirectoryCompletion::new(
+                                            self.engine_state.clone(),
+                                            self.stack.clone(),
+                                        );
 
                                         return self.process_completion(
                                             &mut completer,
@@ -326,8 +332,10 @@ impl NuCompleter {
                                         );
                                     }
                                     FlatShape::Filepath | FlatShape::GlobPattern => {
-                                        let mut completer =
-                                            FileCompletion::new(self.engine_state.clone());
+                                        let mut completer = FileCompletion::new(
+                                            self.engine_state.clone(),
+                                            self.stack.clone(),
+                                        );
 
                                         return self.process_completion(
                                             &mut completer,
@@ -374,8 +382,10 @@ impl NuCompleter {
                                         }
 
                                         // Check for file completion
-                                        let mut completer =
-                                            FileCompletion::new(self.engine_state.clone());
+                                        let mut completer = FileCompletion::new(
+                                            self.engine_state.clone(),
+                                            self.stack.clone(),
+                                        );
                                         out = self.process_completion(
                                             &mut completer,
                                             &working_set,

crates/nu-cli/src/completions/completion_common.rs

@@ -1,6 +1,10 @@
 use crate::completions::{matches, CompletionOptions};
+use nu_ansi_term::Style;
+use nu_engine::env_to_string;
 use nu_path::home_dir;
+use nu_protocol::engine::{EngineState, Stack};
 use nu_protocol::{engine::StateWorkingSet, Span};
+use nu_utils::get_ls_colors;
 use std::path::{is_separator, Component, Path, PathBuf, MAIN_SEPARATOR as SEP};
 
 fn complete_rec(
@@ -92,10 +96,21 @@ pub fn complete_item(
     partial: &str,
     cwd: &str,
     options: &CompletionOptions,
-) -> Vec<(nu_protocol::Span, String)> {
+    engine_state: &EngineState,
+    stack: &Stack,
+) -> Vec<(nu_protocol::Span, String, Option<Style>)> {
     let partial = surround_remove(partial);
     let isdir = partial.ends_with(is_separator);
     let cwd_pathbuf = Path::new(cwd).to_path_buf();
+    let ls_colors = (engine_state.config.use_ls_colors_completions
+        && engine_state.config.use_ansi_coloring)
+        .then(|| {
+            let ls_colors_env_str = match stack.get_env_var(engine_state, "LS_COLORS") {
+                Some(v) => env_to_string("LS_COLORS", &v, engine_state, stack).ok(),
+                None => None,
+            };
+            get_ls_colors(ls_colors_env_str)
+        });
     let mut original_cwd = OriginalCwd::None;
     let mut components = Path::new(&partial).components().peekable();
     let mut cwd = match components.peek().cloned() {
@@ -148,7 +163,18 @@ pub fn complete_item(
 
     complete_rec(partial.as_slice(), &cwd, options, want_directory, isdir)
         .into_iter()
-        .map(|p| (span, escape_path(original_cwd.apply(&p), want_directory)))
+        .map(|p| {
+            let path = original_cwd.apply(&p);
+            let style = ls_colors.as_ref().map(|lsc| {
+                lsc.style_for_path_with_metadata(
+                    &path,
+                    std::fs::symlink_metadata(&path).ok().as_ref(),
+                )
+                .map(lscolors::Style::to_nu_ansi_term_style)
+                .unwrap_or_default()
+            });
+            (span, escape_path(path, want_directory), style)
+        })
         .collect()
 }
 

crates/nu-cli/src/completions/directory_completions.rs

@@ -2,8 +2,9 @@ use crate::completions::{
     completion_common::{adjust_if_intermediate, complete_item, AdjustView},
     Completer, CompletionOptions, SortBy,
 };
+use nu_ansi_term::Style;
 use nu_protocol::{
-    engine::{EngineState, StateWorkingSet},
+    engine::{EngineState, Stack, StateWorkingSet},
     levenshtein_distance, Span,
 };
 use reedline::Suggestion;
@@ -13,11 +14,15 @@ use std::sync::Arc;
 #[derive(Clone)]
 pub struct DirectoryCompletion {
     engine_state: Arc<EngineState>,
+    stack: Stack,
 }
 
 impl DirectoryCompletion {
-    pub fn new(engine_state: Arc<EngineState>) -> Self {
-        Self { engine_state }
+    pub fn new(engine_state: Arc<EngineState>, stack: Stack) -> Self {
+        Self {
+            engine_state,
+            stack,
+        }
     }
 }
 
@@ -39,12 +44,14 @@ impl Completer for DirectoryCompletion {
             &prefix,
             &self.engine_state.current_work_dir(),
             options,
+            self.engine_state.as_ref(),
+            &self.stack,
         )
         .into_iter()
         .map(move |x| Suggestion {
             value: x.1,
             description: None,
-            style: None,
+            style: x.2,
             extra: None,
             span: reedline::Span {
                 start: x.0.start - offset,
@@ -113,6 +120,8 @@ pub fn directory_completion(
     partial: &str,
     cwd: &str,
     options: &CompletionOptions,
-) -> Vec<(nu_protocol::Span, String)> {
-    complete_item(true, span, partial, cwd, options)
+    engine_state: &EngineState,
+    stack: &Stack,
+) -> Vec<(nu_protocol::Span, String, Option<Style>)> {
+    complete_item(true, span, partial, cwd, options, engine_state, stack)
 }

crates/nu-cli/src/completions/dotnu_completions.rs

@@ -1,6 +1,6 @@
 use crate::completions::{file_path_completion, Completer, CompletionOptions, SortBy};
 use nu_protocol::{
-    engine::{EngineState, StateWorkingSet},
+    engine::{EngineState, Stack, StateWorkingSet},
     Span,
 };
 use reedline::Suggestion;
@@ -12,11 +12,15 @@ use std::{
 #[derive(Clone)]
 pub struct DotNuCompletion {
     engine_state: Arc<EngineState>,
+    stack: Stack,
 }
 
 impl DotNuCompletion {
-    pub fn new(engine_state: Arc<EngineState>) -> Self {
-        Self { engine_state }
+    pub fn new(engine_state: Arc<EngineState>, stack: Stack) -> Self {
+        Self {
+            engine_state,
+            stack,
+        }
     }
 }
 
@@ -92,7 +96,14 @@ impl Completer for DotNuCompletion {
         let output: Vec<Suggestion> = search_dirs
             .into_iter()
             .flat_map(|search_dir| {
-                let completions = file_path_completion(span, &partial, &search_dir, options);
+                let completions = file_path_completion(
+                    span,
+                    &partial,
+                    &search_dir,
+                    options,
+                    self.engine_state.as_ref(),
+                    &self.stack,
+                );
                 completions
                     .into_iter()
                     .filter(move |it| {
@@ -111,7 +122,7 @@ impl Completer for DotNuCompletion {
                     .map(move |x| Suggestion {
                         value: x.1,
                         description: None,
-                        style: None,
+                        style: x.2,
                         extra: None,
                         span: reedline::Span {
                             start: x.0.start - offset,

crates/nu-cli/src/completions/file_completions.rs

@@ -2,8 +2,9 @@ use crate::completions::{
     completion_common::{adjust_if_intermediate, complete_item, AdjustView},
     Completer, CompletionOptions, SortBy,
 };
+use nu_ansi_term::Style;
 use nu_protocol::{
-    engine::{EngineState, StateWorkingSet},
+    engine::{EngineState, Stack, StateWorkingSet},
     levenshtein_distance, Span,
 };
 use nu_utils::IgnoreCaseExt;
@@ -14,11 +15,15 @@ use std::sync::Arc;
 #[derive(Clone)]
 pub struct FileCompletion {
     engine_state: Arc<EngineState>,
+    stack: Stack,
 }
 
 impl FileCompletion {
-    pub fn new(engine_state: Arc<EngineState>) -> Self {
-        Self { engine_state }
+    pub fn new(engine_state: Arc<EngineState>, stack: Stack) -> Self {
+        Self {
+            engine_state,
+            stack,
+        }
     }
 }
 
@@ -44,12 +49,14 @@ impl Completer for FileCompletion {
             &prefix,
             &self.engine_state.current_work_dir(),
             options,
+            self.engine_state.as_ref(),
+            &self.stack,
         )
         .into_iter()
         .map(move |x| Suggestion {
             value: x.1,
             description: None,
-            style: None,
+            style: x.2,
             extra: None,
             span: reedline::Span {
                 start: x.0.start - offset,
@@ -118,8 +125,10 @@ pub fn file_path_completion(
     partial: &str,
     cwd: &str,
     options: &CompletionOptions,
-) -> Vec<(nu_protocol::Span, String)> {
-    complete_item(false, span, partial, cwd, options)
+    engine_state: &EngineState,
+    stack: &Stack,
+) -> Vec<(nu_protocol::Span, String, Option<Style>)> {
+    complete_item(false, span, partial, cwd, options, engine_state, stack)
 }
 
 pub fn matches(partial: &str, from: &str, options: &CompletionOptions) -> bool {