feat: add Google code retrieval across desktop CLI and MCP

crates/searchi-core/src/code.rs

@@ -0,0 +1,52 @@
+//! Shared code-file classification for extraction and pre-ranking scope filters.
+use std::{path::Path, sync::OnceLock};
+
+pub const CODE_EXTENSIONS: &[&str] = &[
+    "rs", "py", "pyi", "js", "jsx", "mjs", "cjs", "ts", "tsx", "mts", "cts", "c", "h", "cpp", "cc",
+    "cxx", "hpp", "hxx", "hh", "go", "java", "kt", "kts", "cs", "swift", "m", "mm", "rb", "php",
+    "phtml", "scala", "sc", "sql", "sh", "bash", "zsh", "fish", "ps1", "psm1", "psd1", "bat",
+    "cmd", "lua", "r", "pl", "pm", "ex", "exs", "erl", "hrl", "hs", "lhs", "clj", "cljs", "cljc",
+    "dart", "vue", "svelte", "graphql", "gql", "tf", "tfvars", "proto", "zig", "vb", "vbs", "f",
+    "for", "f90", "f95", "f03", "pas", "d", "cmake",
+];
+const CODE_FILENAMES: &[&str] = &[
+    "makefile",
+    "gnumakefile",
+    "dockerfile",
+    "cmakelists.txt",
+    "justfile",
+];
+
+pub fn is_code_path(path: &Path) -> bool {
+    let extension = path
+        .extension()
+        .and_then(|value| value.to_str())
+        .unwrap_or("")
+        .to_ascii_lowercase();
+    let filename = path
+        .file_name()
+        .and_then(|value| value.to_str())
+        .unwrap_or("")
+        .to_ascii_lowercase();
+    CODE_EXTENSIONS.contains(&extension.as_str()) || CODE_FILENAMES.contains(&filename.as_str())
+}
+
+/// Static trusted SQL predicate for the shared internal `files f` alias. No
+/// caller-controlled query, path or extension is interpolated into this SQL.
+pub fn code_file_predicate() -> &'static str {
+    static SQL: OnceLock<String> = OnceLock::new();
+    SQL.get_or_init(|| {
+        let literals = |values: &[&str]| {
+            values
+                .iter()
+                .map(|value| format!("'{value}'"))
+                .collect::<Vec<_>>()
+                .join(",")
+        };
+        format!(
+            "(f.extension IN ({}) OR lower(f.filename) IN ({}))",
+            literals(CODE_EXTENSIONS),
+            literals(CODE_FILENAMES)
+        )
+    })
+}

crates/searchi-core/src/extraction.rs

@@ -33,27 +33,30 @@ pub(crate) fn extract(path: &Path) -> Result<Option<Vec<Passage>>> {
             docx(&bytes).map(Some)
         };
     }
-    if !matches!(
-        extension.as_str(),
-        "txt"
-            | "md"
-            | "rs"
-            | "py"
-            | "js"
-            | "ts"
-            | "tsx"
-            | "jsx"
-            | "json"
-            | "toml"
-            | "yaml"
-            | "yml"
-            | "csv"
-            | "html"
-            | "css"
-            | "xml"
-            | "log"
-            | "sh"
-    ) {
+    let code = crate::is_code_path(path);
+    if !code
+        && !matches!(
+            extension.as_str(),
+            "txt"
+                | "md"
+                | "rs"
+                | "py"
+                | "js"
+                | "ts"
+                | "tsx"
+                | "jsx"
+                | "json"
+                | "toml"
+                | "yaml"
+                | "yml"
+                | "csv"
+                | "html"
+                | "css"
+                | "xml"
+                | "log"
+                | "sh"
+        )
+    {
         return Ok(None);
     }
     let file = File::open(path)?;
@@ -69,6 +72,26 @@ pub(crate) fn extract(path: &Path) -> Result<Option<Vec<Passage>>> {
         return Ok(None);
     };
     let lines = text.split_inclusive('\n').collect::<Vec<_>>();
+    if code {
+        let mut passages = Vec::new();
+        for start in (0..lines.len()).step_by(96) {
+            if passages.len() >= MAX_PASSAGES {
+                return Ok(None);
+            }
+            let end = (start + 128).min(lines.len());
+            passages.push(Passage {
+                text: lines[start..end].concat(),
+                source: SourceLocation {
+                    kind: "line".into(),
+                    number: (start + 1) as u32,
+                },
+            });
+            if end == lines.len() {
+                break;
+            }
+        }
+        return Ok(Some(passages));
+    }
     Ok(Some(
         lines
             .chunks(64)

crates/searchi-core/src/lib.rs

@@ -3,7 +3,9 @@
 //! Reconciliation is atomic. Incomplete directory walks never delete records.
 //! Text and document extraction have byte limits, but still run in this process.
 //! Worker isolation remains a production milestone.
+mod code;
 mod extraction;
+pub use code::{code_file_predicate, is_code_path, CODE_EXTENSIONS};
 pub mod metrics;
 use anyhow::{bail, Context, Result};
 pub use metrics::{MetricsMode, SearchMetrics, SearchResponse, SearchSpan};
@@ -19,7 +21,7 @@ use std::{
 };
 use walkdir::WalkDir;
 
-const SCHEMA_VERSION: i64 = 10;
+const SCHEMA_VERSION: i64 = 11;
 const MAX_RESULTS: usize = 1000;
 
 #[derive(Debug, Default, Serialize)]
@@ -50,6 +52,8 @@ impl Default for IndexOptions {
 /// The folder is canonicalized and includes descendants, with a path-boundary check.
 #[derive(Debug, Default, Clone)]
 pub struct SearchOptions {
+    /// Restrict every retrieval lane to source/build-script files before top-K.
+    pub code_only: bool,
     pub folder: Option<PathBuf>,
     pub extension: Option<String>,
     pub min_size: Option<u64>,
@@ -242,6 +246,16 @@ impl SearchIndex {
                 CREATE TRIGGER IF NOT EXISTS files_media_delete AFTER DELETE ON files BEGIN DELETE FROM media_metadata WHERE path=old.path; END;
                 CREATE TRIGGER IF NOT EXISTS files_media_update AFTER UPDATE ON files WHEN new.path!=old.path OR new.size!=old.size OR new.mtime!=old.mtime BEGIN DELETE FROM media_metadata WHERE path=old.path; END;
                 PRAGMA user_version=10;")?;
+            if version < 11 {
+                initialization.execute(
+                    &format!(
+                        "UPDATE files AS f SET mtime=-1 WHERE {}",
+                        code_file_predicate()
+                    ),
+                    [],
+                )?;
+            }
+            initialization.execute_batch("PRAGMA user_version=11;")?;
             initialization.commit()?;
         }
         Ok(Self {
@@ -620,12 +634,16 @@ impl SearchIndex {
         trace.end(normalization, Default::default());
         let planning = trace.begin("lexical.candidate_plan", parent);
         let limit = limit.min(MAX_RESULTS);
-        let filters = " AND (?3 IS NULL OR substr(f.path,1,length(?3))=?3)
+        let mut filters = String::from(" AND (?3 IS NULL OR substr(f.path,1,length(?3))=?3)
             AND (?4 IS NULL OR f.extension=?4)
             AND (?5 IS NULL OR f.size>=?5) AND (?6 IS NULL OR f.size<=?6)
             AND (?7 IS NULL OR f.mtime/1000000>=?7) AND (?8 IS NULL OR f.mtime/1000000<=?8)
             AND (?10 IS NULL OR EXISTS(SELECT 1 FROM media_metadata m WHERE m.file_id=f.id AND m.duration_ms>=?10))
-            AND (?11 IS NULL OR EXISTS(SELECT 1 FROM media_metadata m WHERE m.file_id=f.id AND m.duration_ms<=?11))";
+            AND (?11 IS NULL OR EXISTS(SELECT 1 FROM media_metadata m WHERE m.file_id=f.id AND m.duration_ms<=?11))");
+        if options.code_only {
+            filters.push_str(" AND ");
+            filters.push_str(code_file_predicate());
+        }
         let filter_values = [
             folder_prefix.map_or(Value::Null, Value::Text),
             extension.map_or(Value::Null, Value::Text),
@@ -639,6 +657,7 @@ impl SearchIndex {
                 .map_or(Value::Null, Value::Integer),
         ];
         let has_filters = filter_values.iter().any(|value| *value != Value::Null)
+            || options.code_only
             || options.min_duration_ms.is_some()
             || options.max_duration_ms.is_some();
         let mut results = Vec::new();