Add Markdown index HTML output mode

internal/config/load_test.go

@@ -94,6 +94,58 @@ pipelines:
 	}
 }
 
+func TestLoadFileValidMarkdownIndexConfig(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: static-site
+    source:
+      backend: local
+      path: /var/spool/reports
+    destinations:
+      - id: web
+        backend: local
+        path: /srv/www/reports
+        publish:
+          source: false
+          html: true
+        transform:
+          markdown_to_html:
+            enabled: true
+            mode: index
+            input: report.md
+`)
+
+	markdown := cfg.Pipelines[0].Destinations[0].Transform.MarkdownToHTML
+	if markdown == nil || markdown.Mode != TransformModeIndex || markdown.Input != "report.md" {
+		t.Fatalf("markdown config = %#v, want index input", markdown)
+	}
+}
+
+func TestLoadFileDefaultsMarkdownModeToSidecar(t *testing.T) {
+	cfg := loadConfig(t, `
+pipelines:
+  - id: static-site
+    source:
+      backend: local
+      path: /var/spool/reports
+    destinations:
+      - id: web
+        backend: local
+        path: /srv/www/reports
+        publish:
+          source: false
+          html: true
+        transform:
+          markdown_to_html:
+            enabled: true
+`)
+
+	markdown := cfg.Pipelines[0].Destinations[0].Transform.MarkdownToHTML
+	if markdown == nil || markdown.Mode != TransformModeSidecar {
+		t.Fatalf("markdown mode = %#v, want sidecar default", markdown)
+	}
+}
+
 func TestLoadFileValidBackendConfigs(t *testing.T) {
 	tests := map[string]string{
 		"local": `
@@ -464,6 +516,7 @@ func TestExampleConfigsLoad(t *testing.T) {
 		"../../examples/local-to-local.yml",
 		"../../examples/local-publish.yml",
 		"../../examples/local-html.yml",
+		"../../examples/local-index.yml",
 		"../../examples/fan-out.yml",
 		"../../examples/ssh-destination.yml",
 		"../../examples/s3-destination.yml",