Navigating documentation panel with breadcrumbs (#8176)

Closes #8131

https://github.com/enso-org/enso/assets/6566674/69609307-d5f5-4185-af65-aed1f6b85978

app/gui2/src/components/DocumentationPanel.vue

@@ -1,15 +1,21 @@
 <script setup lang="ts">
+import type { Item as Breadcrumb } from '@/components/DocumentationPanel/DocsBreadcrumbs.vue'
+import Breadcrumbs from '@/components/DocumentationPanel/DocsBreadcrumbs.vue'
 import DocsExamples from '@/components/DocumentationPanel/DocsExamples.vue'
 import DocsHeader from '@/components/DocumentationPanel/DocsHeader.vue'
 import DocsList from '@/components/DocumentationPanel/DocsList.vue'
 import DocsSynopsis from '@/components/DocumentationPanel/DocsSynopsis.vue'
 import DocsTags from '@/components/DocumentationPanel/DocsTags.vue'
+import { HistoryStack } from '@/components/DocumentationPanel/history'
 import type { Docs, FunctionDocs, Sections, TypeDocs } from '@/components/DocumentationPanel/ir'
 import { lookupDocumentation, placeholder } from '@/components/DocumentationPanel/ir'
 import { useSuggestionDbStore } from '@/stores/suggestionDatabase'
 import type { SuggestionId } from '@/stores/suggestionDatabase/entry'
+import type { Icon as IconName } from '@/util/iconName'
 import { type Opt } from '@/util/opt'
-import { computed } from 'vue'
+import type { QualifiedName } from '@/util/qualifiedName'
+import { qnSegments, qnSlice } from '@/util/qualifiedName'
+import { computed, watch } from 'vue'
 
 const props = defineProps<{ selectedEntry: Opt<SuggestionId> }>()
 const emit = defineEmits<{ 'update:selectedEntry': [id: SuggestionId] }>()
@@ -40,29 +46,113 @@ const types = computed<TypeDocs[]>(() => {
   const docs = documentation.value
   return docs.kind === 'Module' ? docs.types : []
 })
+
+const isPlaceholder = computed(() => 'Placeholder' in documentation.value)
+
+const name = computed<Opt<QualifiedName>>(() => {
+  const docs = documentation.value
+  return docs.kind === 'Placeholder' ? null : docs.name
+})
+
+// === Breadcrumbs ===
+
+const color = computed<string>(() => {
+  const id = props.selectedEntry
+  if (id) {
+    const entry = db.entries.get(id)
+    const groupIndex = entry?.groupIndex ?? -1
+    const group = db.groups[groupIndex]
+    if (group) {
+      const name = group.name.replace(/\s/g, '-')
+      return `var(--group-color-${name})`
+    }
+  }
+  return 'var(--group-color-fallback)'
+})
+
+const icon = computed<IconName>(() => {
+  const id = props.selectedEntry
+  if (id) {
+    const entry = db.entries.get(id)
+    return entry?.iconName ?? 'marketplace'
+  } else {
+    return 'marketplace'
+  }
+})
+
+const historyStack = new HistoryStack()
+
+// Reset breadcrumbs history when the user selects the entry from the component list.
+watch(
+  () => props.selectedEntry,
+  (entry) => {
+    if (entry && historyStack.current.value !== entry) {
+      historyStack.reset(entry)
+    }
+  },
+)
+
+// Update displayed documentation page when the user uses breadcrumbs.
+watch(historyStack.current, (current) => {
+  if (current) {
+    emit('update:selectedEntry', current)
+  }
+})
+
+const breadcrumbs = computed<Breadcrumb[]>(() => {
+  if (name.value) {
+    const segments = qnSegments(name.value)
+    return segments.slice(1).map((s) => ({ label: s.toLowerCase() }))
+  } else {
+    return []
+  }
+})
+
+function handleBreadcrumbClick(index: number) {
+  if (name.value) {
+    const qName = qnSlice(name.value, 0, index + 2)
+    if (qName.ok) {
+      const [id] = db.entries.nameToId.lookup(qName.value)
+      if (id) {
+        historyStack.record(id)
+      }
+    }
+  }
+}
 </script>
 
 <template>
   <div class="DocumentationPanel scrollable" @wheel.stop.passive>
     <h1 v-if="documentation.kind === 'Placeholder'">{{ documentation.text }}</h1>
-    <DocsTags v-if="sections.tags.length > 0" :tags="sections.tags" />
+    <Breadcrumbs
+      v-if="!isPlaceholder"
+      :breadcrumbs="breadcrumbs"
+      :color="color"
+      :icon="icon"
+      :canGoForward="historyStack.canGoForward()"
+      :canGoBackward="historyStack.canGoBackward()"
+      @click="(index) => handleBreadcrumbClick(index)"
+      @forward="historyStack.forward()"
+      @backward="historyStack.backward()"
+    />
+    <DocsTags v-if="sections.tags.length > 0" class="tags" :tags="sections.tags" />
     <div class="sections">
       <span v-if="sections.synopsis.length == 0">{{ 'No documentation available.' }}</span>
       <DocsSynopsis :sections="sections.synopsis" />
       <DocsHeader v-if="types.length > 0" kind="types" label="Types" />
       <DocsList
         :items="{ kind: 'Types', items: types }"
-        @linkClicked="emit('update:selectedEntry', $event)"
+        @linkClicked="historyStack.record($event)"
       />
       <DocsHeader v-if="constructors.length > 0" kind="methods" label="Constructors" />
       <DocsList
         :items="{ kind: 'Constructors', items: constructors }"
-        @linkClicked="emit('update:selectedEntry', $event)"
+        @linkClicked="historyStack.record($event)"
       />
       <DocsHeader v-if="methods.length > 0" kind="methods" label="Methods" />
       <DocsList
         :items="{ kind: 'Methods', items: methods }"
-        @linkClicked="emit('update:selectedEntry', $event)"
+        @linkClicked="historyStack.record($event)"
       />
       <DocsHeader v-if="sections.examples.length > 0" kind="examples" label="Examples" />
       <DocsExamples :examples="sections.examples" />
@@ -89,11 +179,18 @@ const types = computed<TypeDocs[]>(() => {
   line-height: 160%;
   color: var(--enso-docs-text-color);
   background-color: var(--enso-docs-background-color);
-  padding: 8px 12px 4px 8px;
+  padding: 4px 12px 4px 4px;
   white-space: normal;
   clip-path: inset(0 0 4px 0);
   height: 100%;
   overflow-y: auto;
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+}
+
+.tags {
+  margin: 4px 0 0 8px;
 }
 
 .sections {

app/gui2/src/components/DocumentationPanel/DocsBreadcrumb.vue

@@ -0,0 +1,42 @@
+<script setup lang="ts">
+import SvgIcon from '@/components/SvgIcon.vue'
+import type { Icon } from '@/util/iconName'
+
+const props = defineProps<{ text: string; icon?: Icon | undefined }>()
+const emit = defineEmits<{ click: [] }>()
+</script>
+
+<template>
+  <div class="Breadcrumb">
+    <SvgIcon v-if="props.icon" :name="props.icon || ''" />
+    <span @pointerdown="emit('click')" v-text="props.text"></span>
+  </div>
+</template>
+
+<style scoped>
+.Breadcrumb {
+  user-select: none;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  gap: 2px;
+  overflow-x: hidden;
+}
+
+span {
+  display: inline-block;
+  height: 24px;
+  padding: 1px 0px;
+  color: white;
+  font-weight: 500;
+  font-style: normal;
+  line-height: 20px;
+  white-space: nowrap;
+  overflow-x: hidden;
+  text-overflow: ellipsis;
+}
+
+svg {
+  color: white;
+}
+</style>

app/gui2/src/components/DocumentationPanel/DocsBreadcrumbs.vue

@@ -0,0 +1,97 @@
+<script setup lang="ts">
+import SvgIcon from '@/components/SvgIcon.vue'
+import type { Icon } from '@/util/iconName'
+
+import Breadcrumb from '@/components/DocumentationPanel/DocsBreadcrumb.vue'
+
+export interface Item {
+  label: string
+}
+
+const props = defineProps<{
+  breadcrumbs: Item[]
+  color: string
+  icon: Icon
+  canGoForward: boolean
+  canGoBackward: boolean
+}>()
+const emit = defineEmits<{ click: [index: number]; backward: []; forward: [] }>()
+
+/**
+ * Shrink first and middle elements in the breacrumbs, keeping the original size of others.
+ */
+function shrinkFactor(index: number): number {
+  const middle = Math.floor(props.breadcrumbs.length / 2)
+  return index === middle || index === 0 ? 100 : 0
+}
+</script>
+
+<template>
+  <div class="Breadcrumbs" :style="{ 'background-color': color }">
+    <div class="breadcrumbs-controls">
+      <SvgIcon
+        name="arrow_left"
+        draggable="false"
+        :class="['icon', 'button', 'arrow', { inactive: !props.canGoBackward }]"
+        @pointerdown="emit('backward')"
+      />
+      <SvgIcon
+        name="arrow_right"
+        draggable="false"
+        :class="['icon', 'button', 'arrow', { inactive: !props.canGoForward }]"
+        @pointerdown="emit('forward')"
+      />
+    </div>
+    <TransitionGroup name="breadcrumbs">
+      <template v-for="(breadcrumb, index) in props.breadcrumbs" :key="[index, breadcrumb.label]">
+        <SvgIcon v-if="index > 0" name="arrow_right_head_only" class="arrow" />
+        <Breadcrumb
+          :text="breadcrumb.label"
+          :icon="index === props.breadcrumbs.length - 1 ? props.icon : undefined"
+          :style="{ 'flex-shrink': shrinkFactor(index) }"
+          @click="emit('click', index)"
+        />
+      </template>
+    </TransitionGroup>
+  </div>
+</template>
+
+<style scoped>
+.Breadcrumbs {
+  display: flex;
+  height: 32px;
+  padding: 8px 10px 8px 8px;
+  align-items: center;
+  gap: 2px;
+  border-radius: 16px;
+  transition: background-color 0.5s;
+  max-width: 100%;
+}
+
+.breadcrumbs-controls {
+  display: flex;
+}
+
+.inactive {
+  opacity: 0.3;
+}
+
+.arrow {
+  color: white;
+  transition: opacity 0.5s;
+}
+
+.breadcrumbs-move,
+.breadcrumbs-enter-active,
+.breadcrumb-leave-active {
+  transition: all 0.3s ease;
+}
+
+.breadcrumbs-leave-active {
+  display: none;
+}
+
+.breadcrumbs-enter-from {
+  opacity: 0;
+}
+</style>

app/gui2/src/components/DocumentationPanel/DocsList.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import type { FunctionDocs, TypeDocs } from '@/components/DocumentationPanel/ir'
 import type { Doc } from '@/util/docParser'
+import { qnSplit } from '@/util/qualifiedName'
 import type { SuggestionEntryArgument, SuggestionId } from 'shared/languageServerTypes/suggestions'
 import { computed } from 'vue'
 
@@ -51,7 +52,7 @@ const annotations = computed<Array<string | undefined>>(() => {
         :class="['link', props.items.kind]"
         @pointerdown.stop.prevent="emit('linkClicked', item.id)"
       >
-        <span class="entryName">{{ item.name }}</span>
+        <span class="entryName">{{ qnSplit(item.name)[1] }}</span>
         <span class="arguments">{{ ' ' + argumentsList(item.arguments) }}</span>
       </a>
       <!-- eslint-disable vue/no-v-html -->

app/gui2/src/components/DocumentationPanel/history.ts

@@ -0,0 +1,97 @@
+import type { SuggestionId } from '@/stores/suggestionDatabase/entry'
+import type { ComputedRef, Ref } from 'vue'
+import { computed, reactive, ref } from 'vue'
+
+/**
+ * Simple stack for going forward and backward through the history of visited documentation pages
+ */
+export class HistoryStack {
+  private stack: SuggestionId[]
+  private index: Ref<number>
+  public current: ComputedRef<SuggestionId | undefined>
+
+  constructor() {
+    this.stack = reactive([])
+    this.index = ref(0)
+    this.current = computed(() => this.stack[this.index.value] ?? undefined)
+  }
+
+  public reset(current: SuggestionId) {
+    this.stack.length = 0
+    this.stack.push(current)
+    this.index.value = 0
+  }
+
+  public record(id: SuggestionId) {
+    this.stack.splice(this.index.value + 1)
+    this.stack.push(id)
+    this.index.value = this.stack.length - 1
+  }
+
+  public forward() {
+    if (this.canGoForward()) {
+      this.index.value += 1
+    }
+  }
+
+  public backward() {
+    if (this.canGoBackward()) {
+      this.index.value -= 1
+    }
+  }
+
+  public canGoBackward(): boolean {
+    return this.index.value > 0
+  }
+
+  public canGoForward(): boolean {
+    return this.index.value < this.stack.length - 1
+  }
+}
+
+if (import.meta.vitest) {
+  const { test, expect } = import.meta.vitest
+  const ID_1 = 10
+  const ID_2 = 20
+  const ID_3 = 30
+
+  test('HistoryStack basic operations', () => {
+    const stack = new HistoryStack()
+    expect(stack.current.value).toBeUndefined()
+    expect(stack.canGoBackward()).toBeFalsy()
+    expect(stack.canGoForward()).toBeFalsy()
+
+    stack.reset(ID_1)
+    expect(stack.current.value).toStrictEqual(ID_1)
+    stack.forward()
+    expect(stack.current.value).toStrictEqual(ID_1)
+    expect(stack.canGoBackward()).toBeFalsy()
+    expect(stack.canGoForward()).toBeFalsy()
+
+    stack.record(ID_2)
+    expect(stack.current.value).toStrictEqual(ID_2)
+    expect(stack.canGoBackward()).toBeTruthy()
+    expect(stack.canGoForward()).toBeFalsy()
+
+    stack.backward()
+    expect(stack.current.value).toStrictEqual(ID_1)
+    expect(stack.canGoBackward()).toBeFalsy()
+    expect(stack.canGoForward()).toBeTruthy()
+    stack.backward()
+    expect(stack.current.value).toStrictEqual(ID_1)
+    stack.forward()
+    expect(stack.current.value).toStrictEqual(ID_2)
+    expect(stack.canGoForward()).toBeFalsy()
+    stack.forward()
+    expect(stack.current.value).toStrictEqual(ID_2)
+
+    stack.backward()
+    expect(stack.current.value).toStrictEqual(ID_1)
+    stack.record(ID_3)
+    expect(stack.current.value).toStrictEqual(ID_3)
+    stack.forward()
+    expect(stack.current.value).toStrictEqual(ID_3)
+    stack.backward()
+    expect(stack.current.value).toStrictEqual(ID_1)
+  })
+}

app/gui2/src/components/DocumentationPanel/ir.ts

@@ -1,7 +1,8 @@
 import type { SuggestionDb } from '@/stores/suggestionDatabase'
 import type { SuggestionEntry, SuggestionId } from '@/stores/suggestionDatabase/entry'
-import { SuggestionKind } from '@/stores/suggestionDatabase/entry'
+import { SuggestionKind, entryQn } from '@/stores/suggestionDatabase/entry'
 import type { Doc } from '@/util/docParser'
+import type { QualifiedName } from '@/util/qualifiedName'
 import type { SuggestionEntryArgument } from 'shared/languageServerTypes/suggestions'
 
 // === Types ===
@@ -20,7 +21,7 @@ export interface Placeholder {
 export interface FunctionDocs {
   kind: 'Function'
   id: SuggestionId
-  name: string
+  name: QualifiedName
   arguments: SuggestionEntryArgument[]
   sections: Sections
 }
@@ -28,7 +29,7 @@ export interface FunctionDocs {
 export interface TypeDocs {
   kind: 'Type'
   id: SuggestionId
-  name: string
+  name: QualifiedName
   arguments: SuggestionEntryArgument[]
   sections: Sections
   methods: FunctionDocs[]
@@ -38,7 +39,7 @@ export interface TypeDocs {
 export interface ModuleDocs {
   kind: 'Module'
   id: SuggestionId
-  name: string
+  name: QualifiedName
   sections: Sections
   types: TypeDocs[]
   methods: FunctionDocs[]
@@ -47,7 +48,7 @@ export interface ModuleDocs {
 export interface LocalDocs {
   kind: 'Local'
   id: SuggestionId
-  name: string
+  name: QualifiedName
   sections: Sections
 }
 
@@ -144,7 +145,7 @@ type DocsHandle = (db: SuggestionDb, entry: SuggestionEntry, id: SuggestionId) =
 const handleFunction: DocsHandle = (_db, entry, id) => ({
   kind: 'Function',
   id,
-  name: entry.name,
+  name: entryQn(entry),
   arguments: entry.arguments,
   sections: filterSections(entry.documentation),
 })
@@ -156,13 +157,13 @@ const handleDocumentation: Record<SuggestionKind, DocsHandle> = {
   [SuggestionKind.Local]: (_db, entry, id) => ({
     kind: 'Local',
     id,
-    name: entry.name,
+    name: entryQn(entry),
     sections: filterSections(entry.documentation),
   }),
   [SuggestionKind.Type]: (db, entry, id) => ({
     kind: 'Type',
     id,
-    name: entry.name,
+    name: entryQn(entry),
     arguments: entry.arguments,
     sections: filterSections(entry.documentation),
     methods: asFunctionDocs(getChildren(db, id, SuggestionKind.Method)),
@@ -171,7 +172,7 @@ const handleDocumentation: Record<SuggestionKind, DocsHandle> = {
   [SuggestionKind.Module]: (db, entry, id) => ({
     kind: 'Module',
     id,
-    name: entry.name,
+    name: entryQn(entry),
     sections: filterSections(entry.documentation),
     types: asTypeDocs(getChildren(db, id, SuggestionKind.Type)),
     methods: asFunctionDocs(getChildren(db, id, SuggestionKind.Method)),

app/gui2/src/util/qualifiedName.ts

@@ -63,6 +63,18 @@ export function qnJoin(left: QualifiedName, right: QualifiedName): QualifiedName
   return `${left}.${right}` as QualifiedName
 }
 
+export function qnSegments(name: QualifiedName): Identifier[] {
+  return name.split('.').map((segment) => segment as Identifier)
+}
+
+export function qnSlice(
+  name: QualifiedName,
+  start?: number | undefined,
+  end?: number | undefined,
+): Result<QualifiedName> {
+  return tryQualifiedName(qnSegments(name).slice(start, end).join('.'))
+}
+
 /** Checks if given full qualified name is considered a top element of some project.
  *
  * The fully qualified names consists of namespace, project name, and then a path (possibly empty).