Adding SlackLinkUtils and few other methods

Author: ashwanthkumar

src/main/java/in/ashwanthkumar/slack/webhook/SlackLinkUtils.java

@@ -0,0 +1,31 @@
+package in.ashwanthkumar.slack.webhook;
+
+public class SlackLinkUtils {
+    public static String email(String email, String user) {
+        return String.format("<mailto:%s|%s>", email, user);
+    }
+
+    public static String email(String email) {
+        return String.format("<mailto:%s>", email);
+    }
+
+    public static String link(String href, String name) {
+        return String.format("<%s|%s>", href, name);
+    }
+
+    public static String link(String href) {
+        return String.format("<%s>", href);
+    }
+
+    public static String user(String handle, String name) {
+        return String.format("<@%s|%s>", handle, name);
+    }
+
+    public static String user(String handle) {
+        return String.format("<@%s>", handle);
+    }
+
+    public static String channel(String channel) {
+        return String.format("<#%s>", channel);
+    }
+}

src/test/java/in/ashwanthkumar/slack/webhook/SlackLinkUtilsTest.java

@@ -0,0 +1,34 @@
+package in.ashwanthkumar.slack.webhook;
+
+import org.junit.Test;
+
+import static in.ashwanthkumar.slack.webhook.SlackLinkUtils.*;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+public class SlackLinkUtilsTest {
+    @Test
+    public void shouldGenerateEmailInLinkableFormat() {
+        assertThat(email("foo-bar@ashwanthkumar.in", "Ashwanth"), is("<mailto:foo-bar@ashwanthkumar.in|Ashwanth>"));
+        assertThat(email("foo-bar@ashwanthkumar.in"), is("<mailto:foo-bar@ashwanthkumar.in>"));
+    }
+
+    @Test
+    public void shouldGenrateHrefsInLinkFormat() {
+        assertThat(link("www.foo.com", "Foo"), is("<www.foo.com|Foo>"));
+        assertThat(link("www.foo.com"), is("<www.foo.com>"));
+    }
+
+    @Test
+    public void shouldGenerateUserHandlesInLinkableFormat() {
+        assertThat(user("ashwanthkumar", "Ash"), is("<@ashwanthkumar|Ash>"));
+        assertThat(user("ashwanthkumar"), is("<@ashwanthkumar>"));
+    }
+
+    @Test
+    public void shouldGenerateChannelsInLinkableFormat() {
+        assertThat(channel("general"), is("<#general>"));
+    }
+
+
+}