Prefer installing version from `toolchain` directive

Prefer this over the version from the `go` directive. Per the docs[1]

> The toolchain line declares a suggested toolchain to use with the
module or workspace

It seems reasonable to use this, since running this action in a
directory containing a `go.mod` (or `go.work`) suggests the user is
wishing to work _with the module or workspace_.

Link: https://go.dev/doc/toolchain#config [1]
Issue: https://github.com/actions/setup-go/issues/457

README.md

@@ -191,9 +191,15 @@ steps:
 
 ## Getting go version from the go.mod file
 
-The `go-version-file` input accepts a path to a `go.mod` file or a `go.work` file that contains the version of Go to be used by a project.
+The `go-version-file` input accepts a path to a `go.mod` file or a `go.work`
+file that contains the version of Go to be used by a project. The version taken
+from thils file will be:
+
+  - The version from the `toolchain` directive, if there is one, otherwise
+  - The version from the `go` directive
+
+The version can specify a patch version or omit it altogether (e.g., `go 1.22.0` or `go 1.22`).
 
-The `go` directive in `go.mod` can specify a patch version or omit it altogether (e.g., `go 1.22.0` or `go 1.22`).  
 If a patch version is specified, that specific patch version will be used.  
 If no patch version is specified, it will search for the latest available patch version in the cache,
 [versions-manifest.json](https://github.com/actions/go-versions/blob/main/versions-manifest.json), and the

__tests__/setup-go.test.ts

@@ -988,6 +988,56 @@ use .
     );
   });
 
+  describe('go-version-file-toolchain', () => {
+    const goModContents = `module example.com/mymodule
+
+go 1.14
+
+toolchain go1.21.0
+
+require (
+	example.com/othermodule v1.2.3
+	example.com/thismodule v1.2.3
+	example.com/thatmodule v1.2.3
+)
+
+replace example.com/thatmodule => ../thatmodule
+exclude example.com/thismodule v1.3.0
+`;
+
+    const goWorkContents = `go 1.19
+
+toolchain go1.21.0
+
+use .
+
+`;
+
+    it('reads version from toolchain directive in go.mod', async () => {
+      inputs['go-version-file'] = 'go.mod';
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(goModContents));
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.21.0');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.21.0...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.21.0...');
+    });
+
+    it('reads version from toolchain directive in go.work', async () => {
+      inputs['go-version-file'] = 'go.work';
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(goWorkContents));
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.21.0');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.21.0...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.21.0...');
+    });
+  });
+
   it('exports GOTOOLCHAIN and sets it in current process env', async () => {
     inputs['go-version'] = '1.21.0';
     inSpy.mockImplementation(name => inputs[name]);

dist/setup/index.js

@@ -94663,8 +94663,14 @@ function parseGoVersionFile(versionFilePath) {
     const contents = fs_1.default.readFileSync(versionFilePath).toString();
     if (path.basename(versionFilePath) === 'go.mod' ||
         path.basename(versionFilePath) === 'go.work') {
-        const match = contents.match(/^go (\d+(\.\d+)*)/m);
+        // toolchain directive: https://go.dev/ref/mod#go-mod-file-toolchain
-        return match ? match[1] : '';
+        const matchToolchain = contents.match(/^toolchain go(\d+(\.\d+)*)/m);
+        if (matchToolchain) {
+            return matchToolchain[1];
+        }
+        // go directive: https://go.dev/ref/mod#go-mod-file-go
+        const matchGo = contents.match(/^go (\d+(\.\d+)*)/m);
+        return matchGo ? matchGo[1] : '';
     }
     return contents.trim();
 }

src/installer.ts

@@ -495,8 +495,15 @@ export function parseGoVersionFile(versionFilePath: string): string {
     path.basename(versionFilePath) === 'go.mod' ||
     path.basename(versionFilePath) === 'go.work'
   ) {
-    const match = contents.match(/^go (\d+(\.\d+)*)/m);
+    // toolchain directive: https://go.dev/ref/mod#go-mod-file-toolchain
-    return match ? match[1] : '';
+    const matchToolchain = contents.match(/^toolchain go(\d+(\.\d+)*)/m);
+    if (matchToolchain) {
+      return matchToolchain[1];
+    }
+
+    // go directive: https://go.dev/ref/mod#go-mod-file-go
+    const matchGo = contents.match(/^go (\d+(\.\d+)*)/m);
+    return matchGo ? matchGo[1] : '';
   }
 
   return contents.trim();