From 5a75d8f64e85fd8ab8cb692206b035065f4af89e Mon Sep 17 00:00:00 2001
From: Martin Mauch <martin@mauch.dev>
Date: Mon, 30 Dec 2024 23:54:36 +0100
Subject: [PATCH] build: Read build matrix from Mill

---
 .github/workflows/ci.yml | 31 ++++++++++++++++++-------------
 1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a43a91db..19bb4108 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,23 +16,28 @@ env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
 jobs:
+  prepare:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Generate matrix
+        id: set-matrix
+        run: |
+          echo -n "matrix=" >> $GITHUB_OUTPUT
+          ./mill resolve "spark-excel[_,_]" | \
+          jq -Rsc 'split("\n") | map(capture("spark-excel\\[(?<scala>[^,]+),(?<spark>[^\\]]+)\\]") | select(.)) | {include: .}' >> $GITHUB_OUTPUT
+
   build:
+    needs: prepare
     name: Build and Test
     strategy:
       fail-fast: false
-      matrix:
-        os: [ubuntu-latest]
-        scala: [2.12.20, 2.13.15]
-        java: [temurin@11]
-        spark: [2.4.8, 3.0.3, 3.1.3, 3.2.4, 3.3.4, 3.4.4, 3.5.3]
-        exclude:
-          - spark: 2.4.8
-            scala: 2.13.15
-          - spark: 3.0.3
-            scala: 2.13.15
-          - spark: 3.1.3
-            scala: 2.13.15
-    runs-on: ${{ matrix.os }}
+      matrix: ${{ fromJson(needs.prepare.outputs.matrix) }}
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout current branch (full)
         uses: actions/checkout@v4