Stop after first match is found with --quiet.

Fixes #77.

doc/rg.1

@@ -91,6 +91,7 @@ Suppress line numbers.
 .TP
 .B \-q, \-\-quiet
 Do not print anything to stdout.
+If a match is found in a file, stop searching that file.
 .RS
 .RE
 .TP

doc/rg.1.md

@@ -61,7 +61,8 @@ the raw speed of grep.
 : Suppress line numbers.
 
 -q, --quiet
-: Do not print anything to stdout.
+: Do not print anything to stdout. If a match is found in a file, stop
+  searching that file.
 
 -r, --replace *ARG*
 : Replace every match with the string given. Capture group indices (e.g., $5)

src/args.rs

@@ -66,7 +66,8 @@ Common options:
     -n, --line-number          Show line numbers (1-based). This is enabled
                                by default at a tty.
     -N, --no-line-number       Suppress line numbers.
-    -q, --quiet                Do not print anything to stdout.
+    -q, --quiet                Do not print anything to stdout. If a match is
+                               found in a file, stop searching that file.
     -r, --replace ARG          Replace every match with the string given.
                                Capture group indices (e.g., $5) and names
                                (e.g., $foo) are supported.

src/printer.rs

@@ -116,6 +116,11 @@ impl<W: Terminal + Send> Printer<W> {
         self.has_printed
     }
 
+    /// Returns true if the printer has been configured to be quiet.
+    pub fn is_quiet(&self) -> bool {
+        self.quiet
+    }
+
     /// Flushes the underlying writer and returns it.
     pub fn into_inner(mut self) -> W {
         let _ = self.wtr.flush();

src/search_buffer.rs

@@ -104,7 +104,7 @@ impl<'a, W: Send + Terminal> BufferSearcher<'a, W> {
                 self.print_match(m.start(), m.end());
             }
             last_end = m.end();
-            if self.opts.files_with_matches {
+            if self.printer.is_quiet() || self.opts.files_with_matches {
                 break;
             }
         }

src/search_stream.rs

@@ -265,7 +265,8 @@ impl<'a, R: io::Read, W: Terminal + Send> Searcher<'a, R, W> {
 
     #[inline(always)]
     fn terminate(&self) -> bool {
-        return self.opts.files_with_matches && self.match_count > 0;
+        self.match_count > 0
+        && (self.printer.is_quiet() || self.opts.files_with_matches)
     }
 
     #[inline(always)]