From aefdd6406943a40db1a8c594f1d17067b4c4cd00 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Molakvo=C3=A6=20=28skjnldsv=29?=
 <skjnldsv@protonmail.com>
Date: Thu, 30 Jul 2020 10:25:17 +0200
Subject: [PATCH] Unified search UI
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>
---
 core/src/views/UnifiedSearch.vue | 505 +++++++++++++++++++++++++++++++
 1 file changed, 505 insertions(+)
 create mode 100644 core/src/views/UnifiedSearch.vue

diff --git a/core/src/views/UnifiedSearch.vue b/core/src/views/UnifiedSearch.vue
new file mode 100644
index 0000000000..099ed7c325
--- /dev/null
+++ b/core/src/views/UnifiedSearch.vue
@@ -0,0 +1,505 @@
+ <!--
+  - @copyright Copyright (c) 2020 John Molakvoæ <skjnldsv@protonmail.com>
+  -
+  - @author John Molakvoæ <skjnldsv@protonmail.com>
+  -
+  - @license GNU AGPL version 3 or any later version
+  -
+  - This program is free software: you can redistribute it and/or modify
+  - it under the terms of the GNU Affero General Public License as
+  - published by the Free Software Foundation, either version 3 of the
+  - License, or (at your option) any later version.
+  -
+  - This program is distributed in the hope that it will be useful,
+  - but WITHOUT ANY WARRANTY; without even the implied warranty of
+  - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  - GNU Affero General Public License for more details.
+  -
+  - You should have received a copy of the GNU Affero General Public License
+  - along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -
+  -->
+<template>
+	<HeaderMenu id="unified-search"
+		class="unified-search"
+		:open.sync="open"
+		@open="onOpen"
+		@close="onClose">
+		<!-- Header icon -->
+		<template #trigger>
+			<span class="icon-search-white" />
+		</template>
+
+		<!-- Search input -->
+		<div class="unified-search__input-wrapper">
+			<input ref="input"
+				v-model="query"
+				class="unified-search__input"
+				type="search"
+				:placeholder="t('core', 'Search for {types} …', { types: typesNames.join(', ') })"
+				@input="onInputDebounced"
+				@keypress.enter.prevent.stop="onInputEnter">
+		</div>
+
+		<EmptyContent v-if="isLoading" icon="icon-loading">
+			{{ t('core', 'Searching …') }}
+		</EmptyContent>
+
+		<template v-else-if="!hasResults">
+			<EmptyContent v-if="isValidQuery && isDoneSearching" icon="icon-search">
+				{{ t('core', 'No results for {query}', {query}) }}
+			</EmptyContent>
+
+			<EmptyContent v-else-if="!isLoading || isShortQuery" icon="icon-search">
+				{{ t('core', 'Start typing to search') }}
+				<template v-if="isShortQuery" #desc>
+					{{ n('core',
+						'Please enter {minSearchLength} character or more to search',
+						'Please enter {minSearchLength} characters  or more to search',
+						minSearchLength,
+						{minSearchLength}) }}
+				</template>
+			</EmptyContent>
+		</template>
+
+		<!-- Grouped search results -->
+		<template v-else>
+			<ul v-for="(list, type, typesIndex) in results"
+				:key="type"
+				class="unified-search__results"
+				:class="`unified-search__results-${type}`"
+				:aria-label="typesMap[type]">
+				<!-- Search results -->
+				<li v-for="(result, index) in limitIfAny(list, type)" :key="result.resourceUrl">
+					<SearchResult v-bind="result"
+						:query="query"
+						:focused="focused === 0 && typesIndex === 0 && index === 0"
+						@focus="setFocusedIndex" />
+				</li>
+
+				<!-- Load more button -->
+				<li>
+					<SearchResult v-if="!reached[type]"
+						class="unified-search__result-more"
+						:title="loading[type]
+							? t('core', 'Loading more results …')
+							: t('core', 'Load more results')"
+						:icon-class="loading[type] ? 'icon-loading-small' : ''"
+						@click.prevent="loadMore(type)"
+						@focus="setFocusedIndex" />
+				</li>
+			</ul>
+		</template>
+	</HeaderMenu>
+</template>
+
+<script>
+import { getTypes, search, defaultLimit } from '../services/UnifiedSearchService'
+import EmptyContent from '@nextcloud/vue/dist/Components/EmptyContent'
+
+import debounce from 'debounce'
+
+import HeaderMenu from '../components/HeaderMenu'
+import SearchResult from '../components/UnifiedSearch/SearchResult'
+
+const minSearchLength = 2
+
+export default {
+	name: 'UnifiedSearch',
+
+	components: {
+		EmptyContent,
+		HeaderMenu,
+		SearchResult,
+	},
+
+	data() {
+		return {
+			types: [],
+
+			cursors: {},
+			limits: {},
+			loading: {},
+			reached: {},
+			results: {},
+
+			query: '',
+			focused: null,
+
+			defaultLimit,
+			minSearchLength,
+
+			open: false,
+		}
+	},
+
+	computed: {
+		typesIDs() {
+			return this.types.map(type => type.id)
+		},
+		typesNames() {
+			return this.types.map(type => type.name)
+		},
+		typesMap() {
+			return this.types.reduce((prev, curr) => {
+				prev[curr.id] = curr.name
+				return prev
+			}, {})
+		},
+
+		/**
+		 * Is there any result to display
+		 * @returns {boolean}
+		 */
+		hasResults() {
+			return Object.keys(this.results).length !== 0
+		},
+
+		/**
+		 * Is the current search too short
+		 * @returns {boolean}
+		 */
+		isShortQuery() {
+			return this.query && this.query.trim().length < minSearchLength
+		},
+
+		/**
+		 * Is the current search valid
+		 * @returns {boolean}
+		 */
+		isValidQuery() {
+			return this.query && this.query.trim() !== '' && !this.isShortQuery
+		},
+
+		/**
+		 * Have we reached the end of all types searches
+		 * @returns {boolean}
+		 */
+		isDoneSearching() {
+			return Object.values(this.reached).indexOf(false) === -1
+		},
+
+		/**
+		 * Is there any search in progress
+		 * @returns {boolean}
+		 */
+		isLoading() {
+			return Object.values(this.loading).indexOf(true) !== -1
+		},
+	},
+
+	async created() {
+		this.types = await getTypes()
+		console.debug('Unified Search initialized with the following providers', this.types)
+	},
+
+	mounted() {
+		document.addEventListener('keydown', (event) => {
+			// if not already opened, allows us to trigger default browser on second keydown
+			if (event.ctrlKey && event.key === 'f' && !this.open) {
+				event.preventDefault()
+				this.open = true
+				this.focusInput()
+			}
+
+			// https://www.w3.org/WAI/GL/wiki/Using_ARIA_menus
+			if (this.open) {
+				// If arrow down, focus next result
+				if (event.key === 'ArrowDown') {
+					this.focusNext(event)
+				}
+
+				// If arrow up, focus prev result
+				if (event.key === 'ArrowUp') {
+					this.focusPrev(event)
+				}
+			}
+		})
+	},
+
+	methods: {
+		async onOpen() {
+			this.focusInput()
+			// Update types list in the background
+			this.types = await getTypes()
+		},
+		onClose() {
+			this.resetState()
+			this.query = ''
+		},
+
+		resetState() {
+			this.cursors = {}
+			this.limits = {}
+			this.loading = {}
+			this.reached = {}
+			this.results = {}
+			this.focused = null
+		},
+
+		/**
+		 * Focus the search input on next tick
+		 */
+		focusInput() {
+			this.$nextTick(() => {
+				this.$refs.input.focus()
+				this.$refs.input.select()
+			})
+		},
+
+		/**
+		 * If we have results already, open first one
+		 * If not, trigger the search again
+		 */
+		onInputEnter() {
+			if (this.hasResults) {
+				const results = this.getResultsList()
+				results[0].click()
+				return
+			}
+			this.onInput()
+		},
+
+		/**
+		 * Start searching on input
+		 */
+		async onInput() {
+			// Do not search if not long enough
+			if (this.query.trim() === '' || this.isShortQuery) {
+				return
+			}
+
+			// reset search if the query changed
+			this.resetState()
+
+			this.typesIDs.forEach(async type => {
+				this.$set(this.loading, type, true)
+				const request = await search(type, this.query)
+
+				// Process results
+				if (request.data.entries.length > 0) {
+					this.$set(this.results, type, request.data.entries)
+				} else {
+					this.$delete(this.results, type)
+				}
+
+				// Save cursor if any
+				if (request.data.cursor) {
+					this.$set(this.cursors, type, request.data.cursor)
+				} else if (!request.data.isPaginated) {
+					// If no cursor and no pagination, we save the default amount
+					// provided by server's initial state `defaultLimit`
+					this.$set(this.limits, type, this.defaultLimit)
+				}
+
+				// Check if we reached end of pagination
+				if (request.data.entries.length < this.defaultLimit) {
+					this.$set(this.reached, type, true)
+				}
+
+				// If none already focused, focus the first rendered result
+				if (this.focused === null) {
+					this.focused = 0
+				}
+
+				this.$set(this.loading, type, false)
+			})
+		},
+		onInputDebounced: debounce(function(e) {
+			this.onInput(e)
+		}, 200),
+
+		/**
+		 * Load more results for the provided type
+		 * @param {String} type type
+		 */
+		async loadMore(type) {
+			// If already loading, ignore
+			if (this.loading[type]) {
+				return
+			}
+			this.$set(this.loading, type, true)
+
+			if (this.cursors[type]) {
+				const request = await search(type, this.query)
+
+				// Save cursor if any
+				if (request.data.cursor) {
+					this.$set(this.cursors, type, request.data.cursor)
+				}
+
+				if (request.data.entries.length > 0) {
+					this.results[type].push(...request.data.entries)
+				}
+
+				// Check if we reached end of pagination
+				if (request.data.entries.length < this.defaultLimit) {
+					this.$set(this.reached, type, true)
+				}
+			} else
+
+			// If no cursor, we might have all the results already,
+			// let's fake pagination and show the next xxx entries
+			if (this.limits[type] && this.limits[type] >= 0) {
+				this.limits[type] += this.defaultLimit
+
+				// Check if we reached end of pagination
+				if (this.limits[type] >= this.results[type].length) {
+					this.$set(this.reached, type, true)
+				}
+			}
+
+			// Focus result after render
+			if (this.focused !== null) {
+				this.$nextTick(() => {
+					this.focusIndex(this.focused)
+				})
+			}
+
+			this.$set(this.loading, type, false)
+		},
+
+		/**
+		 * Return a subset of the array if the search provider
+		 * doesn't supports pagination
+		 *
+		 * @param {Array} list the results
+		 * @param {string} type the type
+		 * @returns {Array}
+		 */
+		limitIfAny(list, type) {
+			if (!this.limits[type]) {
+				return list
+			}
+			return list.slice(0, this.limits[type])
+		},
+
+		getResultsList() {
+			return this.$el.querySelectorAll('.unified-search__results .unified-search__result')
+		},
+
+		/**
+		 * Focus the first result if any
+		 * @param {Event} event the keydown event
+		 */
+		focusFirst(event) {
+			const results = this.getResultsList()
+			if (results && results.length > 0) {
+				if (event) {
+					event.preventDefault()
+				}
+				this.focused = 0
+				this.focusIndex(this.focused)
+			}
+		},
+
+		/**
+		 * Focus the next result if any
+		 * @param {Event} event the keydown event
+		 */
+		focusNext(event) {
+			if (this.focused === null) {
+				this.focusFirst()
+				return
+			}
+
+			const results = this.getResultsList()
+			// If we're not focusing the last, focus the next one
+			if (results && results.length > 0 && this.focused + 1 < results.length) {
+				event.preventDefault()
+				this.focused++
+				this.focusIndex(this.focused)
+			}
+		},
+
+		/**
+		 * Focus the previous result if any
+		 * @param {Event} event the keydown event
+		 */
+		focusPrev(event) {
+			if (this.focused === null) {
+				this.focusFirst(event)
+				return
+			}
+
+			const results = this.getResultsList()
+			// If we're not focusing the first, focus the previous one
+			if (results && results.length > 0 && this.focused > 0) {
+				event.preventDefault()
+				this.focused--
+				this.focusIndex(this.focused)
+			}
+
+		},
+
+		/**
+		 * Focus the specified result index if it exists
+		 * @param {number} index the result index
+		 */
+		focusIndex(index) {
+			const results = this.getResultsList()
+			if (results && results[index]) {
+				results[index].focus()
+			}
+		},
+
+		/**
+		 * Set the current focused element based on the target
+		 * @param {Event} event the focus event
+		 */
+		setFocusedIndex(event) {
+			const entry = event.target
+			const results = this.getResultsList()
+			const index = [...results].findIndex(search => search === entry)
+			console.info(entry, index)
+			if (index > -1) {
+				// let's not use focusIndex as the entry is already focused
+				this.focused = index
+			}
+		},
+	},
+}
+</script>
+
+<style lang="scss" scoped>
+$margin: 10px;
+$input-padding: 6px;
+
+.unified-search {
+	&__input-wrapper {
+		position: sticky;
+		// above search results
+		z-index: 2;
+		top: 0;
+		background-color: var(--color-main-background);
+	}
+
+	&__input {
+		// Minus margins
+		width: calc(100% - 2 * #{$margin});
+		height: 34px;
+		margin: $margin;
+		padding: $input-padding;
+		text-overflow: ellipsis;
+	}
+
+	&__results {
+		&::before {
+			display: block;
+			margin: $margin;
+			margin-left: $margin + $input-padding;
+			content: attr(aria-label);
+			color: var(--color-primary);
+		}
+	}
+
+	.unified-search__result-more::v-deep {
+		color: var(--color-text-maxcontrast);
+	}
+
+	.empty-content {
+		margin: 10vh 0;
+	}
+}
+
+</style>