feat(commands): add commit message validation command (#4)

src/index.ts

@@ -407,4 +407,37 @@ program
       );
   });
 
+program
+  .command("validate")
+  .description("Validate whether a string fits given commit conventions")
+  .argument("[message]", "string for validation")
+  .action(async (string: string) => {
+    try {
+      const message = string || fs.readFileSync(0, "utf-8");
+
+      const config = await GetConfig();
+
+      // Regex for testing:
+      // /(build|feat|docs)(\((commands|changelog)\))?!?: .* ?(\(..*\))?((\n\n..*)?(\n\n..*)?)?/gm
+
+      const testRegex = new RegExp(
+        `(${
+          config?.types?.map((type) => type.value).join("|") ||
+          "feat|fix|build|ci|docs|perf|refactor"
+        })(\\((${
+          config?.scopes?.join("|") || "..*"
+        })\\))?!?: .* ?(\\(..*\\))?((\n\n..*)?(\n\n..*)?)?`,
+        "gm"
+      );
+
+      console.log(
+        testRegex.test(message)
+          ? "[rcz]: valid message"
+          : "[rcz]: invalid message"
+      );
+    } catch (err) {
+      console.log("[rcz]: no stdin found");
+    }
+  });
+
 program.parse();