Add path completions

crates/nu-cli/src/completions.rs

@@ -8,6 +8,8 @@ use nu_protocol::{
 };
 use reedline::Completer;
 
+const SEP: char = std::path::MAIN_SEPARATOR;
+
 pub struct NuCompleter {
     engine_state: Rc<RefCell<EngineState>>,
 }
@@ -28,6 +30,8 @@ impl Completer for NuCompleter {
 
         let flattened = flatten_block(&working_set, &output);
 
+        // println!("flattened: {:?}", flattened);
+
         for flat in flattened {
             if pos >= flat.0.start && pos <= flat.0.end {
                 match &flat.1 {
@@ -80,6 +84,25 @@ impl Completer for NuCompleter {
                             })
                             .collect();
                     }
+                    nu_parser::FlatShape::Filepath | nu_parser::FlatShape::GlobPattern => {
+                        let prefix = working_set.get_span_contents(flat.0);
+                        let prefix = String::from_utf8_lossy(prefix).to_string();
+
+                        let results = file_path_completion(flat.0, &prefix);
+
+                        return results
+                            .into_iter()
+                            .map(move |x| {
+                                (
+                                    reedline::Span {
+                                        start: x.0.start - offset,
+                                        end: x.0.end - offset,
+                                    },
+                                    x.1,
+                                )
+                            })
+                            .collect();
+                    }
                     _ => {}
                 }
             }
@@ -88,3 +111,56 @@ impl Completer for NuCompleter {
         vec![]
     }
 }
+
+fn file_path_completion(
+    span: nu_protocol::Span,
+    partial: &str,
+) -> Vec<(nu_protocol::Span, String)> {
+    use std::path::{is_separator, Path};
+
+    let (base_dir_name, partial) = {
+        // If partial is only a word we want to search in the current dir
+        let (base, rest) = partial.rsplit_once(is_separator).unwrap_or((".", partial));
+        // On windows, this standardizes paths to use \
+        let mut base = base.replace(is_separator, &SEP.to_string());
+
+        // rsplit_once removes the separator
+        base.push(SEP);
+        (base, rest)
+    };
+
+    let base_dir = nu_path::expand_path(&base_dir_name);
+    // This check is here as base_dir.read_dir() with base_dir == "" will open the current dir
+    // which we don't want in this case (if we did, base_dir would already be ".")
+    if base_dir == Path::new("") {
+        return Vec::new();
+    }
+
+    if let Ok(result) = base_dir.read_dir() {
+        result
+            .filter_map(|entry| {
+                entry.ok().and_then(|entry| {
+                    let mut file_name = entry.file_name().to_string_lossy().into_owned();
+                    if matches(partial, &file_name) {
+                        let mut path = format!("{}{}", base_dir_name, file_name);
+                        if entry.path().is_dir() {
+                            path.push(SEP);
+                            file_name.push(SEP);
+                        }
+
+                        Some((span, path))
+                    } else {
+                        None
+                    }
+                })
+            })
+            .collect()
+    } else {
+        Vec::new()
+    }
+}
+
+fn matches(partial: &str, from: &str) -> bool {
+    from.to_ascii_lowercase()
+        .starts_with(&partial.to_ascii_lowercase())
+}

crates/nu-cli/src/syntax_highlight.rs

@@ -81,6 +81,14 @@ impl Highlighter for NuHighlighter {
                     Style::new().fg(nu_ansi_term::Color::Yellow).bold(),
                     next_token,
                 )),
+                FlatShape::Filepath => output.push((
+                    Style::new().fg(nu_ansi_term::Color::Yellow).bold(),
+                    next_token,
+                )),
+                FlatShape::GlobPattern => output.push((
+                    Style::new().fg(nu_ansi_term::Color::Yellow).bold(),
+                    next_token,
+                )),
                 FlatShape::Variable => output.push((
                     Style::new().fg(nu_ansi_term::Color::Blue).bold(),
                     next_token,