diff --git a/.gitea/workflows/release.yml b/.gitea/workflows/release.yml
index 03298ec..8186998 100644
--- a/.gitea/workflows/release.yml
+++ b/.gitea/workflows/release.yml
@@ -18,14 +18,24 @@ jobs:
         with:
           go-version: '1.22'
 
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
       - name: Cross-compile
         shell: bash
         run: |
-          tag="${GITHUB_REF#refs/tags/}"
           mkdir -p dist
           CGO_ENABLED=0 GOOS=linux   GOARCH=amd64 go build -ldflags "-s -w" -o "dist/judge-linux-amd64"       ./cmd/cli
           CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags "-s -w" -o "dist/judge-windows-amd64.exe" ./cmd/cli
-          ls -la dist/
+
+      - name: Build VS Code extension
+        shell: bash
+        run: |
+          npm install -g @vscode/vsce
+          cd editor/vscode-jdg
+          vsce package -o "../../dist/jdg-language-${{ github.ref_name }}.vsix"
 
       - name: Create release
         uses: https://gitea.com/actions/gitea-release-action@main
@@ -33,5 +43,6 @@ jobs:
           files: |-
             dist/judge-linux-amd64
             dist/judge-windows-amd64.exe
+            dist/jdg-language-${{ github.ref_name }}.vsix
           api_key: ${{ secrets.RELEASE_TOKEN }}
           title: ${{ github.ref_name }}
diff --git a/dsl/ast.go b/dsl/ast.go
index a877c13..1d1ccbd 100644
--- a/dsl/ast.go
+++ b/dsl/ast.go
@@ -9,6 +9,7 @@ type File struct {
 	BuildDarwin  string
 	Timeout      time.Duration
 	Binary       string // executable name produced by build (default: solution)
+	Sources      string // glob pattern for source files, expanded as $SOURCES in build
 
 	NormalizeCRLF  bool // strip \r before matching stdout/stderr/outFiles
 	TrimTrailingWS bool // trim trailing whitespace on each line before matching
diff --git a/dsl/parser.go b/dsl/parser.go
index 3e717ae..d379296 100644
--- a/dsl/parser.go
+++ b/dsl/parser.go
@@ -128,6 +128,17 @@ func (p *Parser) parseFile() (*File, error) {
 			}
 			f.Binary = s.Value
 
+		case "sources":
+			p.advance()
+			if _, err := p.expect(TOKEN_ASSIGN); err != nil {
+				return nil, err
+			}
+			s, err := p.expect(TOKEN_STRING)
+			if err != nil {
+				return nil, err
+			}
+			f.Sources = s.Value
+
 		case "normalize_crlf":
 			p.advance()
 			if _, err := p.expect(TOKEN_ASSIGN); err != nil {
diff --git a/editor/.DS_Store b/editor/.DS_Store
deleted file mode 100644
index 05bb5d7..0000000
Binary files a/editor/.DS_Store and /dev/null differ
diff --git a/editor/vscode-jdg/syntaxes/jdg.tmLanguage.json b/editor/vscode-jdg/syntaxes/jdg.tmLanguage.json
index 021df6c..b4fff90 100644
--- a/editor/vscode-jdg/syntaxes/jdg.tmLanguage.json
+++ b/editor/vscode-jdg/syntaxes/jdg.tmLanguage.json
@@ -53,7 +53,7 @@
     },
     "top-keywords": {
       "name": "keyword.control.jdg",
-      "match": "\\b(?:build|build_linux|build_windows|build_darwin|binary|timeout|normalize_crlf|trim_trailing_ws|group|test|pattern|env|file|outFile)\\b"
+      "match": "\\b(?:build|build_linux|build_windows|build_darwin|binary|sources|timeout|normalize_crlf|trim_trailing_ws|group|test|pattern|env|file|outFile)\\b"
     },
     "block-keywords": {
       "name": "variable.parameter.jdg",
diff --git a/runner/runner.go b/runner/runner.go
index e1a3c41..6f49aea 100644
--- a/runner/runner.go
+++ b/runner/runner.go
@@ -119,9 +119,48 @@ func (r *Runner) buildCommand() string {
 	return "go build -o solution ."
 }
 
+func (r *Runner) findSources() (string, error) {
+	if r.file.Sources == "" {
+		return "", nil
+	}
+	var files []string
+	err := filepath.Walk(r.cfg.WorkDir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			if info.Name() == ".git" || info.Name() == ".gitea" {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+		matched, _ := filepath.Match(r.file.Sources, info.Name())
+		if matched {
+			rel, _ := filepath.Rel(r.cfg.WorkDir, path)
+			files = append(files, filepath.ToSlash(rel))
+		}
+		return nil
+	})
+	if err != nil {
+		return "", fmt.Errorf("source discovery: %w", err)
+	}
+	if len(files) == 0 {
+		return "", fmt.Errorf("no files matching %q found", r.file.Sources)
+	}
+	return strings.Join(files, " "), nil
+}
+
 func (r *Runner) build() (string, error) {
 	buildCmd := r.buildCommand()
 
+	sources, err := r.findSources()
+	if err != nil {
+		return "", err
+	}
+	if sources != "" {
+		buildCmd = strings.ReplaceAll(buildCmd, "$SOURCES", sources)
+	}
+
 	ctx := context.Background()
 	if r.file.Timeout > 0 {
 		var cancel context.CancelFunc