set matrix

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

subaction/matrix-gen/action.yml

@@ -4,36 +4,41 @@ description: 'Generate a matrix to distribute builds in your workflow'
 
 inputs:
   workdir:
-    description: 'Working directory'
+    description: Working directory
     default: '.'
     required: false
   files:
-    description: 'Comma separated list of Bake files'
+    description: Comma separated list of Bake files
     required: false
   target:
-    description: 'Bake target'
+    description: Bake target
+    default: 'default'
     required: false
 
+outputs:
+  matrix:
+    description: Matrix of targets
+    value: ${{ jobs.generate.outputs.matrix }}
+
 runs:
   using: composite
   steps:
     -
+      name: Generate matrix
+      id: generate
       uses: actions/github-script@v6
       with:
         script: |
           let def;
+          const files = `${{ inputs.files }}` ? `${{ inputs.files }}`.split(',') : [];
+          const target = `${{ inputs.target }}` ? `${{ inputs.target }}` : 'default';
 
-          await core.group(`Validating`, async () => {
+          await core.group(`Validating definition`, async () => {
             let args = ['buildx', 'bake'];
-            if (`${{ inputs.files }}`) {
-              for (const file of `${{ inputs.files }}`.split(',')) {
-                args.push('--file', file);
-              }
-            }
-            if (`${{ inputs.target }}`) {
-              args.push(`${{ inputs.target }}`);
+            for (const file of files) {
+              args.push('--file', file);
             }
-            args.push('--print');
+            args.push(target, '--print');
 
             const res = await exec.getExecOutput('docker', args, {
               ignoreReturnCode: true,
@@ -46,3 +51,9 @@ runs:
             def = JSON.parse(res.stdout.trim());
             core.info(JSON.stringify(def, null, 2));
           });
+
+          await core.group(`Set matrix`, async () => {
+            const matrix = def.group[target].targets;
+            core.info(`matrix: ${JSON.stringify(matrix)}`);
+            core.setOutput('matrix', JSON.stringify(matrix));
+          });