Adds dropdowns to breadcrumbs

changelogs/unreleased/1212-mklanjsek

@@ -0,0 +1 @@
+Added dropdowns to breadcrumbs

cmd/octant-sample-plugin/main.go

@@ -216,7 +216,19 @@ func initRoutes(router *service.Router) {
 		component1 := gen("Tab 1", "tab1", request.Path())
 		component2 := gen("Tab 2", "tab2", request.Path())
 
-		contentResponse := component.NewContentResponse(component.TitleFromString("Example"))
+		// Illustrate using dropdowns and links for breadcrumbs
+		items := make([]component.DropdownItemConfig, 0)
+		dropdown := component.NewDropdown("test", component.DropdownLink, "action", items...)
+		dropdown.AddDropdownItem("first", component.Url, "Nested Once", "nested-once", "")
+		dropdown.AddDropdownItem("second", component.Url, "Nested Twice", "nested-once/nested-twice", "")
+		dropdown.SetTitle(append([]component.TitleComponent{}, component.NewLink("", "Dropdown", "/url")))
+
+		var title []component.TitleComponent
+		title = component.Title(dropdown)
+		title = append(title, component.NewLink("", "Example Link", "link"))
+		title = append(title, component.NewText("Example"))
+
+		contentResponse := component.NewContentResponse(title)
 		contentResponse.Add(component1, component2)
 
 		return *contentResponse, nil

internal/api/breadcrumb.go

@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2020 the Octant contributors. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package api
+
+import (
+	"path"
+	"sort"
+	"strings"
+
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+
+	"github.com/vmware-tanzu/octant/internal/module"
+	"github.com/vmware-tanzu/octant/internal/octant"
+	"github.com/vmware-tanzu/octant/pkg/store"
+	"github.com/vmware-tanzu/octant/pkg/view/component"
+
+	"github.com/vmware-tanzu/octant/pkg/navigation"
+)
+
+type LinkDefinition struct {
+	Title string
+	Url   string
+}
+
+// Generate breadcrumb for specified path
+func GenerateBreadcrumb(cm *ContentManager, contentPath string, state octant.State, m module.Module, options module.ContentOptions) []component.TitleComponent {
+	var title []component.TitleComponent
+	crPath := "custom-resources"
+
+	navs, err := cm.moduleManager.Navigation(cm.ctx, state.GetNamespace(), m.Name())
+	if err != nil {
+		return title
+	}
+
+	parent, title := CreateNavigationBreadcrumb(navs, contentPath)
+	if title == nil {
+		return title
+	}
+
+	if strings.Contains(contentPath, crPath) {
+		if path.Base(contentPath) == parent.Title || path.Base(parent.Url) == crPath {
+			title = append(title, component.NewText(parent.Title))
+		} else {
+			title = append(title, component.NewLink("", parent.Title, parent.Url), component.NewText(path.Base(contentPath)))
+		}
+	} else {
+		gvk, err := cm.moduleManager.GvkFromPath(path.Dir(contentPath), state.GetNamespace())
+		if err != nil {
+			title = append(title, component.NewText(parent.Title))
+			return title
+		}
+		key := store.KeyFromGroupVersionKind(gvk)
+		key.Selector = options.LabelSet
+
+		if !isClusterScoped(m) {
+			key.Namespace = state.GetNamespace()
+		}
+		list, _, err := cm.dashConfig.ObjectStore().List(cm.ctx, key)
+		if err == nil && list.Items != nil && len(list.Items) > 0 {
+			second := dropdownFromList(parent, path.Base(contentPath), list)
+			title = append(title, second, component.NewText(path.Base(contentPath)))
+		} else {
+			title = append(title, component.NewText(parent.Title))
+		}
+	}
+	return title
+}
+
+// Create first part of breadcrumb from module navigation entries.
+// Performs reverse path traversal and creates all related breadcrumbs.
+func CreateNavigationBreadcrumb(navs []navigation.Navigation, contentPath string) (LinkDefinition, []component.TitleComponent) {
+	var last LinkDefinition
+	var title []component.TitleComponent
+
+	thisPath := contentPath
+	for {
+		if thisPath == "." { // done
+			break
+		}
+		navItems, parent, selection := NavigationFromPath(navs, thisPath)
+		if len(navItems) > 0 {
+			dropdown := dropdownFromNavigation(parent, selection.Title, navItems)
+			title = append(title, dropdown)
+			if len(last.Title) == 0 {
+				last = LinkDefinition{Title: selection.Title, Url: selection.Url}
+			}
+		}
+		thisPath = path.Dir(thisPath)
+	}
+	return last, reverseTitle(title)
+}
+
+// Returns all navigation elements for specified path
+func NavigationFromPath(navs []navigation.Navigation, navPath string) ([]navigation.Navigation, LinkDefinition, LinkDefinition) {
+	for _, nav := range navs {
+		for _, child := range nav.Children {
+			if child.Path == navPath {
+				return nav.Children, LinkDefinition{Title: nav.Title, Url: nav.Path}, LinkDefinition{Title: child.Title, Url: child.Path}
+			}
+		}
+		if nav.Path == navPath && nav.Title != navs[0].Title {
+			return navs, LinkDefinition{Title: navs[0].Title, Url: navs[0].Path}, LinkDefinition{Title: nav.Title, Url: nav.Path}
+		}
+	}
+	return []navigation.Navigation{}, LinkDefinition{}, LinkDefinition{}
+}
+
+func dropdownFromNavigation(title LinkDefinition, selection string, items []navigation.Navigation) *component.Dropdown {
+	dropItems := make([]component.DropdownItemConfig, 0)
+	for _, item := range items {
+		item := component.NewDropdownItem(item.Title, component.Url, item.Title, item.Path, "")
+		dropItems = append(dropItems, item)
+	}
+
+	return createLinkDropdown(title, selection, dropItems, false)
+}
+
+func dropdownFromList(title LinkDefinition, selection string, items *unstructured.UnstructuredList) *component.Dropdown {
+	dropItems := make([]component.DropdownItemConfig, 0)
+	for _, item := range items.Items {
+		item := component.NewDropdownItem(item.GetName(), component.Url, item.GetName(),
+			path.Join(title.Url, item.GetName()), "")
+		dropItems = append(dropItems, item)
+	}
+
+	return createLinkDropdown(title, selection, dropItems, true)
+}
+
+func createLinkDropdown(title LinkDefinition, selection string, items []component.DropdownItemConfig, sortItems bool) *component.Dropdown {
+	if sortItems {
+		sort.Slice(items, func(i, j int) bool { return items[i].Label < items[j].Label })
+	}
+
+	dropdown := component.NewDropdown(title.Title, component.DropdownLink, "", items...)
+	dropdown.SetTitle(append([]component.TitleComponent{}, component.NewLink("", title.Title, title.Url)))
+	dropdown.SetSelection(selection)
+	return dropdown
+}
+
+func reverseTitle(title []component.TitleComponent) []component.TitleComponent {
+
+	for i, j := 0, len(title)-1; i < j; i, j = i+1, j-1 {
+		title[i], title[j] = title[j], title[i]
+	}
+	return title
+}
+
+func isClusterScoped(m module.Module) bool {
+	return m.Name() == "cluster-overview"
+}