Route open providers by request mode

internal/core/plugin/plugin.go

@@ -152,6 +152,7 @@ type OpenProviderSupport struct {
 	Mime       []string `json:"mime,omitempty"`
 	Extensions []string `json:"extensions,omitempty"`
 	Contexts   []string `json:"contexts,omitempty"`
+	Modes      []string `json:"modes,omitempty"`
 }
 
 // ContributionOpenProvider represents an editor/viewer provider contribution.

internal/core/workbench/router.go

@@ -168,6 +168,9 @@ func providerMatches(request OpenResourceRequest, provider plugin.ContributionOp
 		if support.Kind != request.Kind {
 			continue
 		}
+		if !supportMatchesMode(request, support) {
+			continue
+		}
 		if !supportMatchesExtensionOrMime(request, support) {
 			continue
 		}
@@ -179,6 +182,19 @@ func providerMatches(request OpenResourceRequest, provider plugin.ContributionOp
 	return false
 }
 
+func supportMatchesMode(request OpenResourceRequest, support plugin.OpenProviderSupport) bool {
+	if len(support.Modes) == 0 {
+		return true
+	}
+	mode := strings.ToLower(request.Mode)
+	for _, supported := range support.Modes {
+		if strings.ToLower(supported) == mode {
+			return true
+		}
+	}
+	return false
+}
+
 func supportMatchesExtensionOrMime(request OpenResourceRequest, support plugin.OpenProviderSupport) bool {
 	hasExtensionRules := len(support.Extensions) > 0
 	hasMimeRules := len(support.Mime) > 0

internal/core/workbench/routing_test.go

@@ -91,6 +91,47 @@ func TestSelectProviderFallsBackByPriorityThenID(t *testing.T) {
 	}
 }
 
+func TestSelectProviderHonorsSupportModes(t *testing.T) {
+	r := NewRouter(Preferences{})
+	providers := []contribution.ContributionOpenProvider{
+		provider("preview.plugin", "markdown.preview", 100, "MarkdownPreview", plugin.OpenProviderSupport{
+			Kind:       "vault-file",
+			Extensions: []string{".md"},
+			Contexts:   []string{ContextGenericMarkdown},
+			Modes:      []string{"view"},
+		}),
+		provider("editor.plugin", "markdown.editor", 50, "MarkdownEditor", plugin.OpenProviderSupport{
+			Kind:       "vault-file",
+			Extensions: []string{".md"},
+			Contexts:   []string{ContextGenericMarkdown},
+		}),
+	}
+
+	viewProvider, err := r.SelectProvider(OpenResourceRequest{
+		Kind: "vault-file",
+		Path: "Docs/readme.md",
+		Mode: "view",
+	}, providers)
+	if err != nil {
+		t.Fatalf("SelectProvider(view): %v", err)
+	}
+	if viewProvider.Item.ID != "markdown.preview" {
+		t.Fatalf("view provider = %q, want markdown.preview", viewProvider.Item.ID)
+	}
+
+	editProvider, err := r.SelectProvider(OpenResourceRequest{
+		Kind: "vault-file",
+		Path: "Docs/readme.md",
+		Mode: "edit",
+	}, providers)
+	if err != nil {
+		t.Fatalf("SelectProvider(edit): %v", err)
+	}
+	if editProvider.Item.ID != "markdown.editor" {
+		t.Fatalf("edit provider = %q, want markdown.editor", editProvider.Item.ID)
+	}
+}
+
 func TestSelectProviderTieBreaksByPluginIDThenProviderID(t *testing.T) {
 	r := NewRouter(Preferences{})
 	providers := []contribution.ContributionOpenProvider{