chore: add 2024 day04

.github/workflows/tests.yml

@@ -16,6 +16,7 @@ jobs:
       rust_projects: ${{ steps.filter.outputs.rust_projects }}
       go_projects: ${{ steps.filter.outputs.go_projects }}
       csharp_projects: ${{ steps.filter.outputs.csharp_projects }}
+      zig_projects: ${{ steps.filter.outputs.zig_projects }}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -27,7 +28,14 @@ jobs:
           if [ "${{ github.event_name }}" == "pull_request" ]; then
             CHANGED_FILES=$(git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.sha }})
           else
-            CHANGED_FILES=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }})
+            # Handle first push or null before hash
+            BEFORE="${{ github.event.before }}"
+            if [ "$BEFORE" == "0000000000000000000000000000000000000000" ] || [ -z "$BEFORE" ]; then
+              # Get files changed in the last commit
+              CHANGED_FILES=$(git diff --name-only HEAD^ HEAD 2>/dev/null || git ls-files)
+            else
+              CHANGED_FILES=$(git diff --name-only $BEFORE ${{ github.sha }})
+            fi
           fi
 
           echo "Changed files:"
@@ -37,13 +45,15 @@ jobs:
           ALL_RUST_PROJECTS=("2015" "2018" "2019/aoc_rust" "2020/01" "2021/_1" "2021/_2" "2021/_3" "2021/_4" "2021/_5" "2021/_6" "2021/_7" "2022")
           ALL_GO_PROJECTS=("2017" "2019/go" "2020/02" "2024/golang")
           ALL_CSHARP_PROJECTS=("2021/cs/1" "2021/cs/2")
+          ALL_ZIG_PROJECTS=("2024/zig")
 
           # Check for workflow changes - if workflow changed, run all tests
           if echo "$CHANGED_FILES" | grep -q "^.github/workflows/tests.yml"; then
             echo "Workflow changed, running all tests"
             RUST_PROJECTS=$(printf '%s\n' "${ALL_RUST_PROJECTS[@]}" | jq -R . | jq -s -c .)
             GO_PROJECTS=$(printf '%s\n' "${ALL_GO_PROJECTS[@]}" | jq -R . | jq -s -c .)
             CSHARP_PROJECTS=$(printf '%s\n' "${ALL_CSHARP_PROJECTS[@]}" | jq -R . | jq -s -c .)
+            ZIG_PROJECTS=$(printf '%s\n' "${ALL_ZIG_PROJECTS[@]}" | jq -R . | jq -s -c .)
           else
             # Detect Rust projects
             RUST_PROJECTS=()
@@ -69,6 +79,14 @@ jobs:
               fi
             done
 
+            # Detect Zig projects
+            ZIG_PROJECTS=()
+            for project in "${ALL_ZIG_PROJECTS[@]}"; do
+              if echo "$CHANGED_FILES" | grep -q "^${project}/"; then
+                ZIG_PROJECTS+=("$project")
+              fi
+            done
+
             if [ ${#RUST_PROJECTS[@]} -eq 0 ]; then
               RUST_PROJECTS="[]"
             else
@@ -86,15 +104,23 @@ jobs:
             else
               CSHARP_PROJECTS=$(printf '%s\n' "${CSHARP_PROJECTS[@]}" | jq -R . | jq -s -c .)
             fi
+
+            if [ ${#ZIG_PROJECTS[@]} -eq 0 ]; then
+              ZIG_PROJECTS="[]"
+            else
+              ZIG_PROJECTS=$(printf '%s\n' "${ZIG_PROJECTS[@]}" | jq -R . | jq -s -c .)
+            fi
           fi
 
           echo "rust_projects=$RUST_PROJECTS" >> $GITHUB_OUTPUT
           echo "go_projects=$GO_PROJECTS" >> $GITHUB_OUTPUT
           echo "csharp_projects=$CSHARP_PROJECTS" >> $GITHUB_OUTPUT
+          echo "zig_projects=$ZIG_PROJECTS" >> $GITHUB_OUTPUT
 
           echo "Rust projects to test: $RUST_PROJECTS"
           echo "Go projects to test: $GO_PROJECTS"
           echo "C# projects to test: $CSHARP_PROJECTS"
+          echo "Zig projects to test: $ZIG_PROJECTS"
 
   rust_tests:
     needs: detect_changes
@@ -181,3 +207,22 @@ jobs:
       - name: Run C# tests in ${{ matrix.project }}
         run: dotnet test
         working-directory: ${{ matrix.project }}
+
+  zig_tests:
+    needs: detect_changes
+    if: needs.detect_changes.outputs.zig_projects != '[]'
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    strategy:
+      fail-fast: false
+      matrix:
+        project: ${{ fromJson(needs.detect_changes.outputs.zig_projects) }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Zig
+        uses: goto-bus-stop/setup-zig@v2
+        with:
+          version: master
+      - name: Run Zig tests in ${{ matrix.project }}
+        run: zig build test
+        working-directory: ${{ matrix.project }}

2024/zig/data/04/example

@@ -0,0 +1,10 @@
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+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX