From 38009c714cb633f2e1001aa3378dd119eaddc090 Mon Sep 17 00:00:00 2001
From: Bahex <Bahex@users.noreply.github.com>
Date: Fri, 18 Jul 2025 05:16:55 +0300
Subject: [PATCH] feat(completion): enable nucleo's `prefer_prefix` option
 (#16183)

cc: @blindFS @ysthakur

# Description
Enable `nucleo`'s `prefer_prefix` configuration option.
Ranks suggestions with matches closer to the start higher than
suggestions that have matches further from the start.

Example: suggestions based on `reverse`:
<table>
<tr>
<td width=200>Before</td>
<td width=200>After</td>
</tr>
<tr>
<td>

```
bytes reverse
polars reverse
reverse
str reverse
```

</td>
<td>


```
reverse
str reverse
polars reverse
bytes reverse
```

</td>
</tr>
</table>

# User-Facing Changes
More relevant suggestions with fuzzy matching algorithm.
(`$env.config.completions.algorithm = "fuzzy"`)

# Tests + Formatting
We might want to add tests to make sure this option keeps working in the
future.

Co-authored-by: Bahex <17417311+Bahex@users.noreply.github.com>
---
 crates/nu-cli/src/completions/completion_options.rs | 6 +++++-
 crates/nu-lsp/src/symbols.rs                        | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/crates/nu-cli/src/completions/completion_options.rs b/crates/nu-cli/src/completions/completion_options.rs
index 7022d7988d..493f30d341 100644
--- a/crates/nu-cli/src/completions/completion_options.rs
+++ b/crates/nu-cli/src/completions/completion_options.rs
@@ -102,7 +102,11 @@ impl<T> NuMatcher<'_, T> {
                     options,
                     needle: needle.to_owned(),
                     state: State::Fuzzy {
-                        matcher: Matcher::new(Config::DEFAULT),
+                        matcher: Matcher::new({
+                            let mut cfg = Config::DEFAULT;
+                            cfg.prefer_prefix = true;
+                            cfg
+                        }),
                         atom,
                         items: Vec::new(),
                     },
diff --git a/crates/nu-lsp/src/symbols.rs b/crates/nu-lsp/src/symbols.rs
index bea7bab3e8..07b01d2028 100644
--- a/crates/nu-lsp/src/symbols.rs
+++ b/crates/nu-lsp/src/symbols.rs
@@ -80,7 +80,11 @@ pub(crate) struct SymbolCache {
 impl SymbolCache {
     pub fn new() -> Self {
         SymbolCache {
-            matcher: Matcher::new(Config::DEFAULT),
+            matcher: Matcher::new({
+                let mut cfg = Config::DEFAULT;
+                cfg.prefer_prefix = true;
+                cfg
+            }),
             cache: BTreeMap::new(),
             dirty_flags: BTreeMap::new(),
         }