chore: Improve chunking when reading files for grep

Author: dmtrKovalenko

crates/fff-core/src/types.rs

@@ -223,6 +223,13 @@ impl FileItem {
         self.content = OnceLock::new();
     }
 
+    /// Returns already-cached content from the OnceLock, or `None` if not
+    /// yet loaded. No budget check, no I/O — just an atomic load.
+    #[inline]
+    pub fn get_cached_content(&self) -> Option<&[u8]> {
+        self.content.get().map(|c| &**c)
+    }
+
     /// Get the cached file contents or lazily load and cache them.
     ///
     /// Returns `None` if the file is too large, empty, can't be opened, **or
@@ -288,6 +295,7 @@ impl FileItem {
         file.read_exact(buf).ok()?;
         Some(buf.as_slice())
     }
+
 }
 
 /// Page size on Apple Silicon is 16KB; on x86-64 it's 4KB.

crates/fff-nvim/Cargo.toml

@@ -93,6 +93,10 @@ tempfile = "3.8"
 name = "indexing_and_search"
 harness = false
 
+[[bench]]
+name = "grep_bench"
+harness = false
+
 [[bench]]
 name = "query_tracker_bench"
 harness = false