Add stack-root output

README.md

@@ -118,6 +118,7 @@ jobs:
 | `cabal-store` | The path to the cabal store                  | string |
 | `stack-path`  | The path of the stack executable _directory_ | string |
 | `stack-exe`   | The path of the stack _executable_           | string |
+| `stack-root`  | The path to the stack root                   | string |
 
 ## Version Support
 

action.yml

@@ -38,6 +38,8 @@ outputs:
     description: 'The path of the stack executable _directory_'
   stack-exe:
     description: 'The path of the stack _executable_'
+  stack-root:
+    description: 'The path to the stack root'
 runs:
   using: 'node12'
   main: 'dist/index.js'

dist/action.yml

@@ -26,18 +26,20 @@ inputs:
 outputs:
   ghc-path:
     description: 'The path of the ghc executable _directory_'
-  cabal-path:
-    description: 'The path of the cabal executable _directory_'
-  stack-path:
-    description: 'The path of the stack executable _directory_'
-  cabal-store:
-    description: 'The path to the cabal store'
   ghc-exe:
     description: 'The path of the ghc _executable_'
+  cabal-path:
+    description: 'The path of the cabal executable _directory_'
   cabal-exe:
     description: 'The path of the cabal _executable_'
+  cabal-store:
+    description: 'The path to the cabal store'
+  stack-path:
+    description: 'The path of the stack executable _directory_'
   stack-exe:
     description: 'The path of the stack _executable_'
+  stack-root:
+    description: 'The path to the stack root'
 runs:
   using: 'node12'
   main: 'dist/index.js'

dist/index.js

@@ -8728,7 +8728,15 @@ async function cabalConfig() {
         for (const [t, { resolved }] of Object.entries(opts).filter(o => o[1].enable))
             await core.group(`Installing ${t} version ${resolved}`, async () => installer_1.installTool(t, resolved, process.platform));
         if (opts.stack.setup)
-            await core.group('Pre-installing GHC with stack', async () => exec_1.exec('stack', ['setup', opts.ghc.resolved]));
+            await core.group('Pre-installing GHC with stack', async () => {
+                await exec_1.exec('stack', ['setup', opts.ghc.resolved]);
+                if (process.platform === 'win32') {
+                    core.setOutput('stack-root', 'C:\\sr');
+                }
+                else {
+                    core.setOutput('stack-root', `${process.env.HOME}/.stack`);
+                }
+            });
         if (opts.cabal.enable)
             await core.group('Setting up cabal', async () => {
                 await exec_1.exec('cabal', ['user-config', 'update'], { silent: true });

src/setup-haskell.ts

@@ -26,9 +26,15 @@ async function cabalConfig(): Promise<string> {
       );
 
     if (opts.stack.setup)
-      await core.group('Pre-installing GHC with stack', async () =>
-        exec('stack', ['setup', opts.ghc.resolved])
-      );
+      await core.group('Pre-installing GHC with stack', async () => {
+        await exec('stack', ['setup', opts.ghc.resolved]);
+
+        if (process.platform === 'win32') {
+          core.setOutput('stack-root', 'C:\\sr');
+        } else {
+          core.setOutput('stack-root', `${process.env.HOME}/.stack`);
+        }
+      });
 
     if (opts.cabal.enable)
       await core.group('Setting up cabal', async () => {