Optimized code. Compile pattern once and reuse it.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/main/java/com/it_jaros/jns/CliPrinter.java b/src/main/java/com/it_jaros/jns/CliPrinter.java
index e3ced2f..4b3a247 100644
--- a/src/main/java/com/it_jaros/jns/CliPrinter.java
+++ b/src/main/java/com/it_jaros/jns/CliPrinter.java
@@ -18,6 +18,8 @@ import java.util.stream.Collectors;
 
 public class CliPrinter {
 
+    private static final Pattern TTY_SIZE_PATTERN = Pattern.compile("^\\d+\\s+(\\d+)"); // stty size output: cols rows
+
     private final ScheduledExecutorService ui = Executors.newSingleThreadScheduledExecutor();
     private final Scan scan;
     private final boolean quiet;
@@ -118,7 +120,7 @@ public class CliPrinter {
                     new InputStreamReader(process.getInputStream()))) {
                 String line = reader.readLine();
                 if (line != null && !line.isBlank()) {
-                    Matcher matcher = Pattern.compile("^\\d+\\s+(\\d+)").matcher(line.trim());
+                    Matcher matcher = TTY_SIZE_PATTERN.matcher(line.trim());
                     if (matcher.matches()) {
                         return Integer.parseInt(matcher.group(1));
                     }