Add Service trait to remove code duplication

src/service.rs

@@ -0,0 +1,47 @@
+pub(crate) trait Service {
+    fn domain() -> &'static str;
+    fn url_path() -> &'static str;
+    fn commit_url(repo: &str, commit_ref: &str) -> String;
+}
+
+pub(crate) struct GitHub;
+
+impl Service for GitHub {
+    fn domain() -> &'static str {
+        "github.com"
+    }
+    fn url_path() -> &'static str {
+        "github"
+    }
+    fn commit_url(repo: &str, commit_ref: &str) -> String {
+        format!("https://{}/{}/commit/{}", Self::domain(), repo, commit_ref)
+    }
+}
+
+pub(crate) struct Gitlab;
+
+impl Service for Gitlab {
+    fn domain() -> &'static str {
+        "gitlab.com"
+    }
+    fn url_path() -> &'static str {
+        "gitlab"
+    }
+    fn commit_url(repo: &str, commit_ref: &str) -> String {
+        format!("https://{}/{}/commit/{}", Self::domain(), repo, commit_ref)
+    }
+}
+
+pub(crate) struct Bitbucket;
+
+impl Service for Bitbucket {
+    fn domain() -> &'static str {
+        "bitbucket.org"
+    }
+    fn url_path() -> &'static str {
+        "bitbucket"
+    }
+    fn commit_url(repo: &str, commit_ref: &str) -> String {
+        format!("https://{}/{}/commits/{}", Self::domain(), repo, commit_ref)
+    }
+}