improved stdout perf

src/commands/search.rs

@@ -4,6 +4,7 @@ use std::str::FromStr;
 use std::convert::From;
 use std::path::Path;
 use std::path::PathBuf;
+use std::io::Write;
 use tantivy;
 use tantivy::query::QueryParser;
 use tantivy::schema::Field;
@@ -47,6 +48,9 @@ fn run_search(directory: &Path, query: &str) -> tantivy::Result<()> {
     let searcher = index.reader()?.searcher();
     let weight = query.weight(&searcher, false)?;
     let schema = index.schema();
+    let stdout = std::io::stdout();
+    let handle = stdout.lock();
+    let mut wtr = std::io::BufWriter::new(handle);
     for segment_reader in searcher.segment_readers() {
         let mut scorer = weight.scorer(segment_reader, 1.0)?;
         let store_reader = segment_reader.get_store_reader();
@@ -54,7 +58,8 @@ fn run_search(directory: &Path, query: &str) -> tantivy::Result<()> {
             let doc_id = scorer.doc();
             let doc = store_reader.get(doc_id)?;
             let named_doc = schema.to_named_doc(&doc);
-            println!("{}", serde_json::to_string(&named_doc).unwrap());
+            serde_json::to_writer(&mut wtr, &named_doc).unwrap();
+            wtr.write_all(b"\n")?;
         }
     }
     Ok(())