From fc952ad45a57908b519079484e03b071ac61772f Mon Sep 17 00:00:00 2001
From: plukevdh <hi@plukevdh.me>
Date: Fri, 19 May 2023 15:17:09 -0400
Subject: [PATCH 1/4] add rudimentary .tool-versions parser

---
 .github/workflows/versions.yml |  16 ++++
 __tests__/data/.tool-versions  |   4 +
 __tests__/setup-go.test.ts     | 153 +++++++++++++++++++++------------
 src/installer.ts               |   7 ++
 src/main.ts                    |  27 ++++--
 5 files changed, 148 insertions(+), 59 deletions(-)
 create mode 100644 __tests__/data/.tool-versions

diff --git a/.github/workflows/versions.yml b/.github/workflows/versions.yml
index 89fc7b8d3..b25d1d719 100644
--- a/.github/workflows/versions.yml
+++ b/.github/workflows/versions.yml
@@ -134,6 +134,22 @@ jobs:
         run: __tests__/verify-go.sh 1.19
         shell: bash
 
+  tool-versions-file:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ ubuntu-latest, windows-latest, macos-latest ]
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Go and check latest
+        uses: ./
+        with:
+          tool-versions-file: __tests__/data/.tool-versions
+      - name: verify go
+        run: __tests__/verify-go.sh 1.16.3
+        shell: bash
+
   setup-versions-from-manifest:
     name: Setup ${{ matrix.go }} ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
diff --git a/__tests__/data/.tool-versions b/__tests__/data/.tool-versions
new file mode 100644
index 000000000..cce7a1b62
--- /dev/null
+++ b/__tests__/data/.tool-versions
@@ -0,0 +1,4 @@
+terraform 1.3.7
+golang 1.16.3
+python 3.10.11
+ruby 3.2.1
diff --git a/__tests__/setup-go.test.ts b/__tests__/setup-go.test.ts
index cea14f4e8..7a028cefe 100644
--- a/__tests__/setup-go.test.ts
+++ b/__tests__/setup-go.test.ts
@@ -138,7 +138,7 @@ describe('setup-go', () => {
     expect(match!.resolvedVersion).toBe('1.9.7');
     expect(match!.type).toBe('manifest');
     expect(match!.downloadUrl).toBe(
-      'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-darwin-x64.tar.gz'
+        'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-darwin-x64.tar.gz'
     );
   });
 
@@ -151,7 +151,7 @@ describe('setup-go', () => {
     expect(match!.resolvedVersion).toBe('1.9.7');
     expect(match!.type).toBe('manifest');
     expect(match!.downloadUrl).toBe(
-      'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-linux-x64.tar.gz'
+        'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-linux-x64.tar.gz'
     );
   });
 
@@ -164,7 +164,7 @@ describe('setup-go', () => {
     expect(match!.resolvedVersion).toBe('1.9.7');
     expect(match!.type).toBe('manifest');
     expect(match!.downloadUrl).toBe(
-      'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-win32-x64.zip'
+        'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-win32-x64.zip'
     );
   });
 
@@ -263,7 +263,7 @@ describe('setup-go', () => {
     const toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
 
-    const vars: {[key: string]: string} = {};
+    const vars: { [key: string]: string } = {};
     exportVarSpy.mockImplementation((name: string, val: string) => {
       vars[name] = val;
     });
@@ -279,7 +279,7 @@ describe('setup-go', () => {
     const toolPath = path.normalize('/cache/go/1.8.0/x64');
     findSpy.mockImplementation(() => toolPath);
 
-    const vars: {[key: string]: string} = {};
+    const vars: { [key: string]: string } = {};
     exportVarSpy.mockImplementation((name: string, val: string) => {
       vars[name] = val;
     });
@@ -359,9 +359,9 @@ describe('setup-go', () => {
 
     const expPath = path.win32.join(toolPath, 'bin');
     expect(dlSpy).toHaveBeenCalledWith(
-      'https://storage.googleapis.com/golang/go1.13.1.windows-amd64.zip',
-      'C:\\temp\\go1.13.1.windows-amd64.zip',
-      undefined
+        'https://storage.googleapis.com/golang/go1.13.1.windows-amd64.zip',
+        'C:\\temp\\go1.13.1.windows-amd64.zip',
+        undefined
     );
     expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
   });
@@ -376,7 +376,7 @@ describe('setup-go', () => {
     await main.run();
 
     expect(cnSpy).toHaveBeenCalledWith(
-      `::error::Unable to find Go version '9.99.9' for platform linux and architecture x64.${osm.EOL}`
+        `::error::Unable to find Go version '9.99.9' for platform linux and architecture x64.${osm.EOL}`
     );
   });
 
@@ -390,7 +390,7 @@ describe('setup-go', () => {
     inputs['token'] = 'faketoken';
 
     const expectedUrl =
-      'https://github.com/actions/go-versions/releases/download/1.12.16-20200616.20/go-1.12.16-linux-x64.tar.gz';
+        'https://github.com/actions/go-versions/releases/download/1.12.16-20200616.20/go-1.12.16-linux-x64.tar.gz';
 
     // ... but not in the local cache
     findSpy.mockImplementation(() => '');
@@ -407,10 +407,10 @@ describe('setup-go', () => {
     expect(dlSpy).toHaveBeenCalled();
     expect(extractTarSpy).toHaveBeenCalled();
     expect(logSpy).not.toHaveBeenCalledWith(
-      'Not found in manifest.  Falling back to download directly from Go'
+        'Not found in manifest.  Falling back to download directly from Go'
     );
     expect(logSpy).toHaveBeenCalledWith(
-      `Acquiring 1.12.16 from ${expectedUrl}`
+        `Acquiring 1.12.16 from ${expectedUrl}`
     );
 
     expect(logSpy).toHaveBeenCalledWith(`Added go to the path`);
@@ -427,7 +427,7 @@ describe('setup-go', () => {
     inputs['token'] = 'faketoken';
 
     const expectedUrl =
-      'https://github.com/actions/go-versions/releases/download/1.12.17-20200616.21/go-1.12.17-linux-x64.tar.gz';
+        'https://github.com/actions/go-versions/releases/download/1.12.17-20200616.21/go-1.12.17-linux-x64.tar.gz';
 
     // ... but not in the local cache
     findSpy.mockImplementation(() => '');
@@ -444,10 +444,10 @@ describe('setup-go', () => {
     expect(dlSpy).toHaveBeenCalled();
     expect(extractTarSpy).toHaveBeenCalled();
     expect(logSpy).not.toHaveBeenCalledWith(
-      'Not found in manifest.  Falling back to download directly from Go'
+        'Not found in manifest.  Falling back to download directly from Go'
     );
     expect(logSpy).toHaveBeenCalledWith(
-      `Acquiring 1.12.17 from ${expectedUrl}`
+        `Acquiring 1.12.17 from ${expectedUrl}`
     );
 
     expect(logSpy).toHaveBeenCalledWith(`Added go to the path`);
@@ -481,7 +481,7 @@ describe('setup-go', () => {
     expect(logSpy).toHaveBeenCalledWith('matching 1.12.14...');
     expect(extractTarSpy).toHaveBeenCalled();
     expect(logSpy).toHaveBeenCalledWith(
-      'Not found in manifest.  Falling back to download directly from Go'
+        'Not found in manifest.  Falling back to download directly from Go'
     );
     expect(logSpy).toHaveBeenCalledWith(`Install from dist`);
     expect(logSpy).toHaveBeenCalledWith(`Added go to the path`);
@@ -502,7 +502,7 @@ describe('setup-go', () => {
     await main.run();
 
     expect(cnSpy).toHaveBeenCalledWith(
-      `::error::Failed to download version 1.13.1: Error: ${errMsg}${osm.EOL}`
+        `::error::Failed to download version 1.13.1: Error: ${errMsg}${osm.EOL}`
     );
   });
 
@@ -523,7 +523,8 @@ describe('setup-go', () => {
       return '/Users/testuser/go';
     });
 
-    mkdirpSpy.mockImplementation(async () => {});
+    mkdirpSpy.mockImplementation(async () => {
+    });
     existsSpy.mockImplementation(() => {
       return false;
     });
@@ -667,7 +668,7 @@ describe('setup-go', () => {
 
       expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
       expect(logSpy).not.toHaveBeenCalledWith(
-        'Attempting to resolve the latest version from the manifest...'
+          'Attempting to resolve the latest version from the manifest...'
       );
     });
 
@@ -709,20 +710,20 @@ describe('setup-go', () => {
       await main.run();
 
       expect(logSpy).toHaveBeenCalledWith(
-        `Setup go version spec ${versionSpec}`
+          `Setup go version spec ${versionSpec}`
       );
       expect(logSpy).toHaveBeenCalledWith(
-        'Attempting to resolve the latest version from the manifest...'
+          'Attempting to resolve the latest version from the manifest...'
       );
       expect(logSpy).toHaveBeenCalledWith(`Resolved as '${patchVersion}'`);
       expect(logSpy).toHaveBeenCalledWith(
-        `Attempting to download ${patchVersion}...`
+          `Attempting to download ${patchVersion}...`
       );
       expect(logSpy).toHaveBeenCalledWith('Extracting Go...');
       expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
       expect(logSpy).toHaveBeenCalledWith('Added go to the path');
       expect(logSpy).toHaveBeenCalledWith(
-        `Successfully set up Go version ${versionSpec}`
+          `Successfully set up Go version ${versionSpec}`
       );
     });
 
@@ -752,13 +753,13 @@ describe('setup-go', () => {
       expect(dlSpy).toHaveBeenCalled();
       expect(extractTarSpy).toHaveBeenCalled();
       expect(logSpy).toHaveBeenCalledWith(
-        'Attempting to resolve the latest version from the manifest...'
+          'Attempting to resolve the latest version from the manifest...'
       );
       expect(logSpy).toHaveBeenCalledWith(
-        `Failed to resolve version ${versionSpec} from manifest`
+          `Failed to resolve version ${versionSpec} from manifest`
       );
       expect(logSpy).toHaveBeenCalledWith(
-        `Attempting to download ${versionSpec}...`
+          `Attempting to download ${versionSpec}...`
       );
       expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
     });
@@ -793,21 +794,21 @@ describe('setup-go', () => {
       const expPath = path.join(toolPath, 'bin');
 
       expect(logSpy).toHaveBeenCalledWith(
-        `Failed to resolve version ${versionSpec} from manifest`
+          `Failed to resolve version ${versionSpec} from manifest`
       );
       expect(dlSpy).toHaveBeenCalled();
       expect(extractTarSpy).toHaveBeenCalled();
       expect(logSpy).toHaveBeenCalledWith(
-        'Attempting to resolve the latest version from the manifest...'
+          'Attempting to resolve the latest version from the manifest...'
       );
       expect(logSpy).toHaveBeenCalledWith(
-        'Unable to resolve a version from the manifest...'
+          'Unable to resolve a version from the manifest...'
       );
       expect(logSpy).toHaveBeenCalledWith(
-        `Failed to resolve version ${versionSpec} from manifest`
+          `Failed to resolve version ${versionSpec} from manifest`
       );
       expect(logSpy).toHaveBeenCalledWith(
-        `Attempting to download ${versionSpec}...`
+          `Attempting to download ${versionSpec}...`
       );
 
       expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
@@ -891,7 +892,7 @@ use .
       await main.run();
 
       expect(cnSpy).toHaveBeenCalledWith(
-        `::error::The specified go version file at: go.mod does not exist${osm.EOL}`
+          `::error::The specified go version file at: go.mod does not exist${osm.EOL}`
       );
     });
 
@@ -911,9 +912,9 @@ use .
         inputs['architecture'] = arch;
 
         const expectedUrl =
-          platform === 'win32'
-            ? `https://github.com/actions/go-versions/releases/download/${version}/go-${version}-${platform}-${arch}.${fileExtension}`
-            : `https://storage.googleapis.com/golang/go${version}.${osSpec}-${arch}.${fileExtension}`;
+            platform === 'win32'
+                ? `https://github.com/actions/go-versions/releases/download/${version}/go-${version}-${platform}-${arch}.${fileExtension}`
+                : `https://storage.googleapis.com/golang/go${version}.${osSpec}-${arch}.${fileExtension}`;
 
         // ... but not in the local cache
         findSpy.mockImplementation(() => '');
@@ -925,36 +926,80 @@ use .
         await main.run();
 
         expect(logSpy).toHaveBeenCalledWith(
-          `Acquiring go${version} from ${expectedUrl}`
+            `Acquiring go${version} from ${expectedUrl}`
         );
       }
     }, 100000);
 
     it.each(['stable', 'oldstable'])(
-      'acquires latest go version with %s go-version input',
-      async (alias: string) => {
-        const arch = 'x64';
-        os.platform = 'darwin';
-        os.arch = arch;
+        'acquires latest go version with %s go-version input',
+        async (alias: string) => {
+          const arch = 'x64';
+          os.platform = 'darwin';
+          os.arch = arch;
 
-        inputs['go-version'] = alias;
-        inputs['architecture'] = os.arch;
+          inputs['go-version'] = alias;
+          inputs['architecture'] = os.arch;
 
-        // ... but not in the local cache
-        findSpy.mockImplementation(() => '');
+          // ... but not in the local cache
+          findSpy.mockImplementation(() => '');
 
-        dlSpy.mockImplementation(async () => '/some/temp/path');
-        const toolPath = path.normalize(`/cache/go/${alias}/${arch}`);
-        cacheSpy.mockImplementation(async () => toolPath);
+          dlSpy.mockImplementation(async () => '/some/temp/path');
+          const toolPath = path.normalize(`/cache/go/${alias}/${arch}`);
+          cacheSpy.mockImplementation(async () => toolPath);
 
-        await main.run();
+          await main.run();
 
-        const releaseIndex = alias === 'stable' ? 0 : 1;
+          const releaseIndex = alias === 'stable' ? 0 : 1;
 
-        expect(logSpy).toHaveBeenCalledWith(
-          `${alias} version resolved as ${goTestManifest[releaseIndex].version}`
-        );
-      }
+          expect(logSpy).toHaveBeenCalledWith(
+              `${alias} version resolved as ${goTestManifest[releaseIndex].version}`
+          );
+        }
     );
   });
+
+  describe('tool-versions-file', () => {
+    const toolVersionsFile = `terraform 1.3.7
+golang 1.16.3
+python 3.10.11
+ruby 3.2.1
+`;
+
+    it('reads version from .tool-versions when specified', async () => {
+      inputs['tool-versions-file'] = '.special-tool-versions'
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsFile))
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.16.3');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.16.3...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.16.3...');
+    });
+
+    it('is overwritten by go-version param', async () => {
+      inputs['go-version'] = '1.18.2'
+      inputs['tool-versions-file'] = '.special-tool-versions'
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsFile))
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.18.2');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.18.2...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.18.2...');
+    });
+
+    it('uses .tool-versions as a default when no version specified', async () => {
+      existsSpy.mockImplementation(() => true);
+      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsFile))
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith('Setup go version spec 1.16.3');
+      expect(logSpy).toHaveBeenCalledWith('Attempting to download 1.16.3...');
+      expect(logSpy).toHaveBeenCalledWith('matching 1.16.3...');
+    });
+  });
 });
diff --git a/src/installer.ts b/src/installer.ts
index 013fb6405..2894d3e28 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -366,6 +366,13 @@ export function parseGoVersionFile(versionFilePath: string): string {
   return contents.trim();
 }
 
+export function parseToolVersionsFile(toolVersionsPath: string): string {
+  const contents = fs.readFileSync(toolVersionsPath).toString();
+
+  const match = contents.match(/^golang (\d+(\.\d+)*)/m);
+  return match ? match[1] : '';
+}
+
 async function resolveStableVersionDist(versionSpec: string, arch: string) {
   const archFilter = sys.getArch(arch);
   const platFilter = sys.getPlatform();
diff --git a/src/main.ts b/src/main.ts
index d3fb857df..5e4b2601b 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -138,24 +138,41 @@ export function parseGoVersion(versionString: string): string {
 function resolveVersionInput(): string {
   let version = core.getInput('go-version');
   const versionFilePath = core.getInput('go-version-file');
+  let toolVersionsPath = core.getInput('tool-versions-file');
 
-  if (version && versionFilePath) {
+  if (version && (versionFilePath || toolVersionsPath)) {
     core.warning(
-      'Both go-version and go-version-file inputs are specified, only go-version will be used'
+      'Multiple version inputs are specified, only go-version will be used'
     );
   }
 
   if (version) {
     return version;
-  }
-
-  if (versionFilePath) {
+  } else if (versionFilePath) {
     if (!fs.existsSync(versionFilePath)) {
       throw new Error(
         `The specified go version file at: ${versionFilePath} does not exist`
       );
     }
     version = installer.parseGoVersionFile(versionFilePath);
+  } else {
+    // in the case of no version specification, reach for .tool-versions
+    if(toolVersionsPath && !fs.existsSync(toolVersionsPath)) {
+      throw new Error(
+          `The specified .tool-versions file at ${toolVersionsPath} does not exist`
+      )
+    }
+
+    if (!toolVersionsPath) {
+      toolVersionsPath = '.tool-versions'
+      if(!fs.existsSync(toolVersionsPath)) {
+        throw new Error(
+            `No .tool-versions file was found in the project path. Please specify using tool-versions-file`
+        )
+      }
+    }
+
+    version = installer.parseToolVersionsFile(toolVersionsPath)
   }
 
   return version;

From c401b8cb9dc90ad9dd00b0c905695b5f14bf740a Mon Sep 17 00:00:00 2001
From: plukevdh <hi@plukevdh.me>
Date: Fri, 19 May 2023 15:32:26 -0400
Subject: [PATCH 2/4] fix whitespace reformat and missing ;

---
 __tests__/setup-go.test.ts | 121 ++++++++++++++++++-------------------
 src/main.ts                |   8 +--
 2 files changed, 64 insertions(+), 65 deletions(-)

diff --git a/__tests__/setup-go.test.ts b/__tests__/setup-go.test.ts
index 7a028cefe..3a55c53f7 100644
--- a/__tests__/setup-go.test.ts
+++ b/__tests__/setup-go.test.ts
@@ -138,7 +138,7 @@ describe('setup-go', () => {
     expect(match!.resolvedVersion).toBe('1.9.7');
     expect(match!.type).toBe('manifest');
     expect(match!.downloadUrl).toBe(
-        'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-darwin-x64.tar.gz'
+      'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-darwin-x64.tar.gz'
     );
   });
 
@@ -151,7 +151,7 @@ describe('setup-go', () => {
     expect(match!.resolvedVersion).toBe('1.9.7');
     expect(match!.type).toBe('manifest');
     expect(match!.downloadUrl).toBe(
-        'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-linux-x64.tar.gz'
+      'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-linux-x64.tar.gz'
     );
   });
 
@@ -164,7 +164,7 @@ describe('setup-go', () => {
     expect(match!.resolvedVersion).toBe('1.9.7');
     expect(match!.type).toBe('manifest');
     expect(match!.downloadUrl).toBe(
-        'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-win32-x64.zip'
+      'https://github.com/actions/go-versions/releases/download/1.9.7/go-1.9.7-win32-x64.zip'
     );
   });
 
@@ -263,7 +263,7 @@ describe('setup-go', () => {
     const toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
 
-    const vars: { [key: string]: string } = {};
+    const vars: {[key: string]: string} = {};
     exportVarSpy.mockImplementation((name: string, val: string) => {
       vars[name] = val;
     });
@@ -279,7 +279,7 @@ describe('setup-go', () => {
     const toolPath = path.normalize('/cache/go/1.8.0/x64');
     findSpy.mockImplementation(() => toolPath);
 
-    const vars: { [key: string]: string } = {};
+    const vars: {[key: string]: string} = {};
     exportVarSpy.mockImplementation((name: string, val: string) => {
       vars[name] = val;
     });
@@ -359,9 +359,9 @@ describe('setup-go', () => {
 
     const expPath = path.win32.join(toolPath, 'bin');
     expect(dlSpy).toHaveBeenCalledWith(
-        'https://storage.googleapis.com/golang/go1.13.1.windows-amd64.zip',
-        'C:\\temp\\go1.13.1.windows-amd64.zip',
-        undefined
+      'https://storage.googleapis.com/golang/go1.13.1.windows-amd64.zip',
+      'C:\\temp\\go1.13.1.windows-amd64.zip',
+      undefined
     );
     expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
   });
@@ -376,7 +376,7 @@ describe('setup-go', () => {
     await main.run();
 
     expect(cnSpy).toHaveBeenCalledWith(
-        `::error::Unable to find Go version '9.99.9' for platform linux and architecture x64.${osm.EOL}`
+      `::error::Unable to find Go version '9.99.9' for platform linux and architecture x64.${osm.EOL}`
     );
   });
 
@@ -390,7 +390,7 @@ describe('setup-go', () => {
     inputs['token'] = 'faketoken';
 
     const expectedUrl =
-        'https://github.com/actions/go-versions/releases/download/1.12.16-20200616.20/go-1.12.16-linux-x64.tar.gz';
+      'https://github.com/actions/go-versions/releases/download/1.12.16-20200616.20/go-1.12.16-linux-x64.tar.gz';
 
     // ... but not in the local cache
     findSpy.mockImplementation(() => '');
@@ -407,10 +407,10 @@ describe('setup-go', () => {
     expect(dlSpy).toHaveBeenCalled();
     expect(extractTarSpy).toHaveBeenCalled();
     expect(logSpy).not.toHaveBeenCalledWith(
-        'Not found in manifest.  Falling back to download directly from Go'
+      'Not found in manifest.  Falling back to download directly from Go'
     );
     expect(logSpy).toHaveBeenCalledWith(
-        `Acquiring 1.12.16 from ${expectedUrl}`
+      `Acquiring 1.12.16 from ${expectedUrl}`
     );
 
     expect(logSpy).toHaveBeenCalledWith(`Added go to the path`);
@@ -427,7 +427,7 @@ describe('setup-go', () => {
     inputs['token'] = 'faketoken';
 
     const expectedUrl =
-        'https://github.com/actions/go-versions/releases/download/1.12.17-20200616.21/go-1.12.17-linux-x64.tar.gz';
+      'https://github.com/actions/go-versions/releases/download/1.12.17-20200616.21/go-1.12.17-linux-x64.tar.gz';
 
     // ... but not in the local cache
     findSpy.mockImplementation(() => '');
@@ -444,10 +444,10 @@ describe('setup-go', () => {
     expect(dlSpy).toHaveBeenCalled();
     expect(extractTarSpy).toHaveBeenCalled();
     expect(logSpy).not.toHaveBeenCalledWith(
-        'Not found in manifest.  Falling back to download directly from Go'
+      'Not found in manifest.  Falling back to download directly from Go'
     );
     expect(logSpy).toHaveBeenCalledWith(
-        `Acquiring 1.12.17 from ${expectedUrl}`
+      `Acquiring 1.12.17 from ${expectedUrl}`
     );
 
     expect(logSpy).toHaveBeenCalledWith(`Added go to the path`);
@@ -481,7 +481,7 @@ describe('setup-go', () => {
     expect(logSpy).toHaveBeenCalledWith('matching 1.12.14...');
     expect(extractTarSpy).toHaveBeenCalled();
     expect(logSpy).toHaveBeenCalledWith(
-        'Not found in manifest.  Falling back to download directly from Go'
+      'Not found in manifest.  Falling back to download directly from Go'
     );
     expect(logSpy).toHaveBeenCalledWith(`Install from dist`);
     expect(logSpy).toHaveBeenCalledWith(`Added go to the path`);
@@ -502,7 +502,7 @@ describe('setup-go', () => {
     await main.run();
 
     expect(cnSpy).toHaveBeenCalledWith(
-        `::error::Failed to download version 1.13.1: Error: ${errMsg}${osm.EOL}`
+      `::error::Failed to download version 1.13.1: Error: ${errMsg}${osm.EOL}`
     );
   });
 
@@ -523,8 +523,7 @@ describe('setup-go', () => {
       return '/Users/testuser/go';
     });
 
-    mkdirpSpy.mockImplementation(async () => {
-    });
+    mkdirpSpy.mockImplementation(async () => {});
     existsSpy.mockImplementation(() => {
       return false;
     });
@@ -668,7 +667,7 @@ describe('setup-go', () => {
 
       expect(logSpy).toHaveBeenCalledWith(`Found in cache @ ${toolPath}`);
       expect(logSpy).not.toHaveBeenCalledWith(
-          'Attempting to resolve the latest version from the manifest...'
+        'Attempting to resolve the latest version from the manifest...'
       );
     });
 
@@ -710,20 +709,20 @@ describe('setup-go', () => {
       await main.run();
 
       expect(logSpy).toHaveBeenCalledWith(
-          `Setup go version spec ${versionSpec}`
+        `Setup go version spec ${versionSpec}`
       );
       expect(logSpy).toHaveBeenCalledWith(
-          'Attempting to resolve the latest version from the manifest...'
+        'Attempting to resolve the latest version from the manifest...'
       );
       expect(logSpy).toHaveBeenCalledWith(`Resolved as '${patchVersion}'`);
       expect(logSpy).toHaveBeenCalledWith(
-          `Attempting to download ${patchVersion}...`
+        `Attempting to download ${patchVersion}...`
       );
       expect(logSpy).toHaveBeenCalledWith('Extracting Go...');
       expect(logSpy).toHaveBeenCalledWith('Adding to the cache ...');
       expect(logSpy).toHaveBeenCalledWith('Added go to the path');
       expect(logSpy).toHaveBeenCalledWith(
-          `Successfully set up Go version ${versionSpec}`
+        `Successfully set up Go version ${versionSpec}`
       );
     });
 
@@ -753,13 +752,13 @@ describe('setup-go', () => {
       expect(dlSpy).toHaveBeenCalled();
       expect(extractTarSpy).toHaveBeenCalled();
       expect(logSpy).toHaveBeenCalledWith(
-          'Attempting to resolve the latest version from the manifest...'
+        'Attempting to resolve the latest version from the manifest...'
       );
       expect(logSpy).toHaveBeenCalledWith(
-          `Failed to resolve version ${versionSpec} from manifest`
+        `Failed to resolve version ${versionSpec} from manifest`
       );
       expect(logSpy).toHaveBeenCalledWith(
-          `Attempting to download ${versionSpec}...`
+        `Attempting to download ${versionSpec}...`
       );
       expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
     });
@@ -794,21 +793,21 @@ describe('setup-go', () => {
       const expPath = path.join(toolPath, 'bin');
 
       expect(logSpy).toHaveBeenCalledWith(
-          `Failed to resolve version ${versionSpec} from manifest`
+        `Failed to resolve version ${versionSpec} from manifest`
       );
       expect(dlSpy).toHaveBeenCalled();
       expect(extractTarSpy).toHaveBeenCalled();
       expect(logSpy).toHaveBeenCalledWith(
-          'Attempting to resolve the latest version from the manifest...'
+        'Attempting to resolve the latest version from the manifest...'
       );
       expect(logSpy).toHaveBeenCalledWith(
-          'Unable to resolve a version from the manifest...'
+        'Unable to resolve a version from the manifest...'
       );
       expect(logSpy).toHaveBeenCalledWith(
-          `Failed to resolve version ${versionSpec} from manifest`
+        `Failed to resolve version ${versionSpec} from manifest`
       );
       expect(logSpy).toHaveBeenCalledWith(
-          `Attempting to download ${versionSpec}...`
+        `Attempting to download ${versionSpec}...`
       );
 
       expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
@@ -892,7 +891,7 @@ use .
       await main.run();
 
       expect(cnSpy).toHaveBeenCalledWith(
-          `::error::The specified go version file at: go.mod does not exist${osm.EOL}`
+        `::error::The specified go version file at: go.mod does not exist${osm.EOL}`
       );
     });
 
@@ -912,9 +911,9 @@ use .
         inputs['architecture'] = arch;
 
         const expectedUrl =
-            platform === 'win32'
-                ? `https://github.com/actions/go-versions/releases/download/${version}/go-${version}-${platform}-${arch}.${fileExtension}`
-                : `https://storage.googleapis.com/golang/go${version}.${osSpec}-${arch}.${fileExtension}`;
+          platform === 'win32'
+            ? `https://github.com/actions/go-versions/releases/download/${version}/go-${version}-${platform}-${arch}.${fileExtension}`
+            : `https://storage.googleapis.com/golang/go${version}.${osSpec}-${arch}.${fileExtension}`;
 
         // ... but not in the local cache
         findSpy.mockImplementation(() => '');
@@ -926,36 +925,36 @@ use .
         await main.run();
 
         expect(logSpy).toHaveBeenCalledWith(
-            `Acquiring go${version} from ${expectedUrl}`
+          `Acquiring go${version} from ${expectedUrl}`
         );
       }
     }, 100000);
 
     it.each(['stable', 'oldstable'])(
-        'acquires latest go version with %s go-version input',
-        async (alias: string) => {
-          const arch = 'x64';
-          os.platform = 'darwin';
-          os.arch = arch;
+      'acquires latest go version with %s go-version input',
+      async (alias: string) => {
+        const arch = 'x64';
+        os.platform = 'darwin';
+        os.arch = arch;
 
-          inputs['go-version'] = alias;
-          inputs['architecture'] = os.arch;
+        inputs['go-version'] = alias;
+        inputs['architecture'] = os.arch;
 
-          // ... but not in the local cache
-          findSpy.mockImplementation(() => '');
+        // ... but not in the local cache
+        findSpy.mockImplementation(() => '');
 
-          dlSpy.mockImplementation(async () => '/some/temp/path');
-          const toolPath = path.normalize(`/cache/go/${alias}/${arch}`);
-          cacheSpy.mockImplementation(async () => toolPath);
+        dlSpy.mockImplementation(async () => '/some/temp/path');
+        const toolPath = path.normalize(`/cache/go/${alias}/${arch}`);
+        cacheSpy.mockImplementation(async () => toolPath);
 
-          await main.run();
+        await main.run();
 
-          const releaseIndex = alias === 'stable' ? 0 : 1;
+        const releaseIndex = alias === 'stable' ? 0 : 1;
 
-          expect(logSpy).toHaveBeenCalledWith(
-              `${alias} version resolved as ${goTestManifest[releaseIndex].version}`
-          );
-        }
+        expect(logSpy).toHaveBeenCalledWith(
+          `${alias} version resolved as ${goTestManifest[releaseIndex].version}`
+        );
+      }
     );
   });
 
@@ -967,9 +966,9 @@ ruby 3.2.1
 `;
 
     it('reads version from .tool-versions when specified', async () => {
-      inputs['tool-versions-file'] = '.special-tool-versions'
+      inputs['tool-versions-file'] = '.special-tool-versions';
       existsSpy.mockImplementation(() => true);
-      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsFile))
+      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsFile));
 
       await main.run();
 
@@ -979,10 +978,10 @@ ruby 3.2.1
     });
 
     it('is overwritten by go-version param', async () => {
-      inputs['go-version'] = '1.18.2'
-      inputs['tool-versions-file'] = '.special-tool-versions'
+      inputs['go-version'] = '1.18.2';
+      inputs['tool-versions-file'] = '.special-tool-versions';
       existsSpy.mockImplementation(() => true);
-      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsFile))
+      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsFile));
 
       await main.run();
 
@@ -993,7 +992,7 @@ ruby 3.2.1
 
     it('uses .tool-versions as a default when no version specified', async () => {
       existsSpy.mockImplementation(() => true);
-      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsFile))
+      readFileSpy.mockImplementation(() => Buffer.from(toolVersionsFile));
 
       await main.run();
 
diff --git a/src/main.ts b/src/main.ts
index 5e4b2601b..a0bea0199 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -160,19 +160,19 @@ function resolveVersionInput(): string {
     if(toolVersionsPath && !fs.existsSync(toolVersionsPath)) {
       throw new Error(
           `The specified .tool-versions file at ${toolVersionsPath} does not exist`
-      )
+      );
     }
 
     if (!toolVersionsPath) {
-      toolVersionsPath = '.tool-versions'
+      toolVersionsPath = '.tool-versions';
       if(!fs.existsSync(toolVersionsPath)) {
         throw new Error(
             `No .tool-versions file was found in the project path. Please specify using tool-versions-file`
-        )
+        );
       }
     }
 
-    version = installer.parseToolVersionsFile(toolVersionsPath)
+    version = installer.parseToolVersionsFile(toolVersionsPath);
   }
 
   return version;

From a9bf05db077bde6d86fedee138c53b95aa9ce31c Mon Sep 17 00:00:00 2001
From: plukevdh <hi@plukevdh.me>
Date: Mon, 22 May 2023 09:41:36 -0400
Subject: [PATCH 3/4] run lint and build tasks

---
 .github/workflows/versions.yml |  2 +-
 dist/setup/index.js            | 28 ++++++++++++++++++++++++----
 src/main.ts                    |  8 ++++----
 3 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/.github/workflows/versions.yml b/.github/workflows/versions.yml
index b25d1d719..1fd581c44 100644
--- a/.github/workflows/versions.yml
+++ b/.github/workflows/versions.yml
@@ -139,7 +139,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
       - uses: actions/checkout@v3
       - name: Setup Go and check latest
diff --git a/dist/setup/index.js b/dist/setup/index.js
index 0dcd2342d..56b4268e6 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -61337,7 +61337,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.resolveStableVersionInput = exports.parseGoVersionFile = exports.makeSemver = exports.getVersionsDist = exports.findMatch = exports.getInfoFromManifest = exports.getManifest = exports.extractGoArchive = exports.getGo = void 0;
+exports.resolveStableVersionInput = exports.parseToolVersionsFile = exports.parseGoVersionFile = exports.makeSemver = exports.getVersionsDist = exports.findMatch = exports.getInfoFromManifest = exports.getManifest = exports.extractGoArchive = exports.getGo = void 0;
 const tc = __importStar(__nccwpck_require__(7784));
 const core = __importStar(__nccwpck_require__(2186));
 const path = __importStar(__nccwpck_require__(1017));
@@ -61598,6 +61598,12 @@ function parseGoVersionFile(versionFilePath) {
     return contents.trim();
 }
 exports.parseGoVersionFile = parseGoVersionFile;
+function parseToolVersionsFile(toolVersionsPath) {
+    const contents = fs_1.default.readFileSync(toolVersionsPath).toString();
+    const match = contents.match(/^golang (\d+(\.\d+)*)/m);
+    return match ? match[1] : '';
+}
+exports.parseToolVersionsFile = parseToolVersionsFile;
 function resolveStableVersionDist(versionSpec, arch) {
     return __awaiter(this, void 0, void 0, function* () {
         const archFilter = sys.getArch(arch);
@@ -61794,18 +61800,32 @@ exports.parseGoVersion = parseGoVersion;
 function resolveVersionInput() {
     let version = core.getInput('go-version');
     const versionFilePath = core.getInput('go-version-file');
-    if (version && versionFilePath) {
-        core.warning('Both go-version and go-version-file inputs are specified, only go-version will be used');
+    let toolVersionsPath = core.getInput('tool-versions-file');
+    if (version && (versionFilePath || toolVersionsPath)) {
+        core.warning('Multiple version inputs are specified, only go-version will be used');
     }
     if (version) {
         return version;
     }
-    if (versionFilePath) {
+    else if (versionFilePath) {
         if (!fs_1.default.existsSync(versionFilePath)) {
             throw new Error(`The specified go version file at: ${versionFilePath} does not exist`);
         }
         version = installer.parseGoVersionFile(versionFilePath);
     }
+    else {
+        // in the case of no version specification, reach for .tool-versions
+        if (toolVersionsPath && !fs_1.default.existsSync(toolVersionsPath)) {
+            throw new Error(`The specified .tool-versions file at ${toolVersionsPath} does not exist`);
+        }
+        if (!toolVersionsPath) {
+            toolVersionsPath = '.tool-versions';
+            if (!fs_1.default.existsSync(toolVersionsPath)) {
+                throw new Error(`No .tool-versions file was found in the project path. Please specify using tool-versions-file`);
+            }
+        }
+        version = installer.parseToolVersionsFile(toolVersionsPath);
+    }
     return version;
 }
 
diff --git a/src/main.ts b/src/main.ts
index a0bea0199..8be7c6e6e 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -157,17 +157,17 @@ function resolveVersionInput(): string {
     version = installer.parseGoVersionFile(versionFilePath);
   } else {
     // in the case of no version specification, reach for .tool-versions
-    if(toolVersionsPath && !fs.existsSync(toolVersionsPath)) {
+    if (toolVersionsPath && !fs.existsSync(toolVersionsPath)) {
       throw new Error(
-          `The specified .tool-versions file at ${toolVersionsPath} does not exist`
+        `The specified .tool-versions file at ${toolVersionsPath} does not exist`
       );
     }
 
     if (!toolVersionsPath) {
       toolVersionsPath = '.tool-versions';
-      if(!fs.existsSync(toolVersionsPath)) {
+      if (!fs.existsSync(toolVersionsPath)) {
         throw new Error(
-            `No .tool-versions file was found in the project path. Please specify using tool-versions-file`
+          `No .tool-versions file was found in the project path. Please specify using tool-versions-file`
         );
       }
     }

From f162814e287ccb3fd8b1d7428f1d854892f642a6 Mon Sep 17 00:00:00 2001
From: plukevdh <hi@plukevdh.me>
Date: Mon, 22 May 2023 09:49:54 -0400
Subject: [PATCH 4/4] some basic documentation for .tool-versions

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index eb4f9dd23..81dcf5a28 100644
--- a/README.md
+++ b/README.md
@@ -218,6 +218,10 @@ The `go-version` input supports the following syntax:
 For more information about semantic versioning, please refer to [semver](https://github.com/npm/node-semver)
 documentation.
 
+The action can also utilize a [`.tool-versions` file](https://asdf-vm.com/manage/configuration.html#tool-versions) 
+if `go-version` is not specified (`go-version` will take precedence over any `.tool-versions` specified). If the `.
+tool-versions` is not in the project root, you can specify its location via the `tool-version-file` input.
+
 ## Using `setup-go` on GHES
 
 `setup-go` comes pre-installed on the appliance with GHES if Actions is enabled. When dynamically downloading Go