Implement logic for the --version cli global argument (#5384)

Author: ChristopherDedominici

v-next/hardhat/src/internal/cli/main.ts

@@ -33,6 +33,8 @@ import {
 } from "../helpers/config-loading.js";
 import { getHardhatRuntimeEnvironmentSingleton } from "../hre-singleton.js";
 
+import { printVersionMessage } from "./version.js";
+
 export async function main(cliArguments: string[], print = console.log) {
   const hreInitStart = performance.now();
 
@@ -46,7 +48,7 @@ export async function main(cliArguments: string[], print = console.log) {
   );
 
   if (hardhatSpecialArgs.version) {
-    print("3.0.0");
+    await printVersionMessage(print);
     return;
   }
 

v-next/hardhat/src/internal/cli/version.ts

@@ -0,0 +1,5 @@
+import { getHardhatVersion } from "../utils/package.js";
+
+export async function printVersionMessage(print = console.log) {
+  print(await getHardhatVersion());
+}

v-next/hardhat/src/internal/utils/package.ts

@@ -0,0 +1,11 @@
+import type { PackageJson } from "@nomicfoundation/hardhat-utils/package";
+
+import { readClosestPackageJson } from "@nomicfoundation/hardhat-utils/package";
+
+export async function getHardhatVersion(): Promise<string> {
+  const packageJson: PackageJson = await readClosestPackageJson(
+    import.meta.url,
+  );
+
+  return packageJson.version;
+}

v-next/hardhat/test/internal/cli/main.ts

@@ -29,6 +29,7 @@ import {
   parseTaskAndArguments,
 } from "../../../src/internal/cli/main.js";
 import { resetHardhatRuntimeEnvironmentSingleton } from "../../../src/internal/hre-singleton.js";
+import { getHardhatVersion } from "../../../src/internal/utils/package.js";
 import { useFixtureProject } from "../../helpers/project.js";
 
 async function getTasksAndHreEnvironment(
@@ -82,26 +83,25 @@ describe("main", function () {
     describe("version", function () {
       useFixtureProject("cli/parsing/base-project");
 
-      // TODO: as soon as the 'version task' is done, this test should be updated
-      it.todo(
-        "should print the version and instantly return",
-        async function () {
-          const lines: string[] = [];
+      it("should print the version and instantly return", async function () {
+        const lines: string[] = [];
 
-          const command = "npx hardhat --version";
-          const cliArguments = command.split(" ").slice(2);
+        const command = "npx hardhat --version";
+        const cliArguments = command.split(" ").slice(2);
 
-          await main(cliArguments, (msg) => {
-            lines.push(msg);
-          });
+        await main(cliArguments, (msg) => {
+          lines.push(msg);
+        });
 
-          assert.equal(lines.length, 1);
-          assert.equal(lines[0], "3.0.0");
-          // Check that the process exits right after printing the version, the remaining parsing logic should not be executed
-          const tasksResults = await getTasksAndSubtaskResults();
-          assert.equal(tasksResults.wasParam1Used, false);
-        },
-      );
+        // Get the expected package version
+        const expectedVersion = await getHardhatVersion();
+
+        assert.equal(lines.length, 1);
+        assert.equal(lines[0], expectedVersion);
+        // Check that the process exits right after printing the version, the remaining parsing logic should not be executed
+        const tasksResults = await getTasksAndSubtaskResults();
+        assert.equal(tasksResults.wasParam1Used, false);
+      });
     });
 
     describe("show-stack-traces", function () {