add week command

Author: fmbenhassine

src/main/java/io/github/benas/unixstream/UnixStream.java

@@ -5,7 +5,9 @@
 import java.io.*;
 import java.nio.file.*;
 import java.time.LocalDate;
+import java.time.temporal.WeekFields;
 import java.util.Comparator;
+import java.util.Locale;
 import java.util.Objects;
 import java.util.function.Predicate;
 import java.util.stream.Stream;
@@ -83,6 +85,18 @@ static UnixStream<String> date() {
         return new UnixStreamImpl<>(Stream.of(LocalDate.now().toString()));
     }
 
+    /**
+     * Create a new UnixStream with the current week.
+     *
+     * @return a new UnixStream with the current week.
+     */
+    static UnixStream<String> week() {
+        LocalDate now = LocalDate.now();
+        WeekFields weekFields = WeekFields.of(Locale.getDefault());
+        int weekNumber = now.get(weekFields.weekOfWeekBasedYear());
+        return new UnixStreamImpl<>(Stream.of(String.valueOf(weekNumber)));
+    }
+
     /**
      * Create a new UnixStream with the given input.
      *

src/test/java/io/github/benas/unixstream/components/WeekTest.java

@@ -0,0 +1,24 @@
+package io.github.benas.unixstream.components;
+
+import io.github.benas.unixstream.UnixStream;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class WeekTest {
+
+    @Test
+    public void week() throws IOException {
+        UnixStream<String> stream = UnixStream.week();
+
+        List<String> strings = stream.collect(Collectors.toList());
+        assertThat(strings).hasSize(1);
+        int week = Integer.parseInt(strings.get(0));
+
+        assertThat(week).isBetween(1, 52);
+    }
+}