From 004bb35694a564e3f677003dddc97e455bcd7922 Mon Sep 17 00:00:00 2001
From: Andrew Gallant <jamslam@gmail.com>
Date: Sat, 23 Jun 2018 20:18:56 -0400
Subject: [PATCH] ripgrep/printer: fix small performance regression

This commit removes an unconditional extra regex search that is in fact
not always necessary. This can result in a 2x performance improvement in
cases where ripgrep reports many matches.

The fix itself isn't ideal, but we continue to punt on cleaning up the
printer until it is rewritten for libripgrep, which is happening Real
Soon Now.

Fixes #955
---
 src/printer.rs | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/src/printer.rs b/src/printer.rs
index 721967e..20fd1c4 100644
--- a/src/printer.rs
+++ b/src/printer.rs
@@ -272,10 +272,14 @@ impl<W: WriteColor> Printer<W> {
         byte_offset: Option<u64>
     ) {
         if !self.line_per_match && !self.only_matching {
-            let mat = re
-                .find(&buf[start..end])
-                .map(|m| (m.start(), m.end()))
-                .unwrap_or((0, 0));
+            let mat =
+                if !self.needs_match() {
+                    (0, 0)
+                } else {
+                    re.find(&buf[start..end])
+                        .map(|m| (m.start(), m.end()))
+                        .unwrap_or((0, 0))
+                };
             return self.write_match(
                 re, path, buf, start, end, line_number,
                 byte_offset, mat.0, mat.1);
@@ -287,6 +291,12 @@ impl<W: WriteColor> Printer<W> {
         }
     }
 
+    fn needs_match(&self) -> bool {
+        self.column
+        || self.replace.is_some()
+        || self.only_matching
+    }
+
     fn write_match<P: AsRef<Path>>(
         &mut self,
         re: &Regex,