viewer: migrate to vue 3, general refactoring and cleanup

Non-exhaustive list of fixes and improvements done at the same time:

- html default background to grey (avoids white flash during init)
- unified links behavior
- added more theme variables
- removed the flex-expand transition (it wasn't working) and replaced it
  with a slide
- fixed LdLoading not centered on the content
- title on removable tags
- fixed an issue with encoded URI from vue-router
- unified Item resource URLs
- removed the iframe for PlainTextViewer (it wasn't working properly)
  and replaced it with a pre
- fixed clear and search buttons tabindex
- fixed the information panel bumping up during the fade animation of
  tag's dropdown
- fixed some focus outlines not appearing correctly
- moved CSS variables to the :root context
- Code cleaning

GitHub: closes #217
GitHub: closes #300
GitHub: closes #297
GitHub: closes #105
GitHub: closes #267
GitHub: closes #275
GitHub: closes #228
GitHub: closes #215
GitHub: closes #112

1 files changed, 208 insertions, 0 deletions

diff --git a/viewer/src/views/layout/left/LayoutProposition.vue b/viewer/src/views/layout/left/LayoutProposition.vue
new file mode 100644
index 0000000..97dc3a6
--- /dev/null
+++ b/viewer/src/views/layout/left/LayoutProposition.vue
@@ -0,0 +1,208 @@
+<!-- ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2019-2022  Guillaume FOUET
+--               2020       Pacien TRAN-GIRARD
+--
+-- 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 <https://www.gnu.org/licenses/>.
+-->
+
+<template>
+  <div :class="$style.proposition">
+    <h2
+      v-if="showCategory && Object.keys(propositions).length"
+      :class="[$style.subtitle, $style.category]"
+    >
+      {{ title }}
+    </h2>
+    <div
+      v-for="proposed in proposedTags"
+      :key="proposed.rawTag"
+    >
+      <LdLink
+        :class="$style.operationBtns"
+        :title="t('tag-propositions.substraction')"
+        @click="add(Operation.SUBSTRACTION, proposed.rawTag)"
+      >
+        <fa-icon
+          :icon="faMinus"
+          alt="[-]"
+        />
+      </LdLink>
+
+      <LdLink
+        :class="$style.operationBtns"
+        :title="t('tag-propositions.addition')"
+        @click="add(Operation.ADDITION, proposed.rawTag)"
+      >
+        <fa-icon
+          :icon="faPlus"
+          alt="[+]"
+        />
+      </LdLink>
+
+      <LdLink
+        :class="$style.operationTag"
+        :title="t('tag-propositions.intersection')"
+        @click="add(Operation.INTERSECTION, proposed.rawTag)"
+      >
+        {{ proposed.rawTag }}
+      </LdLink>
+
+      <div
+        class="disabled"
+        :title="t('tag-propositions.item-count')"
+      >
+        {{ proposed.count }}
+      </div>
+    </div>
+    <div
+      v-if="showMoreCount > 0"
+      :class="$style.showmore"
+      @click="limit += showMoreCount"
+    >
+      {{ t("tag-propositions.showmore", [showMoreCount]) }}<fa-icon :icon="faAngleDoubleDown" />
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { Item, RawTag } from '@/@types/gallery';
+import { Operation } from '@/@types/operation';
+import { TagIndex, TagNode, TagSearch } from '@/@types/tag';
+import LdLink from '@/components/LdLink.vue';
+import { useGalleryStore } from '@/store/galleryStore';
+import { faAngleDoubleDown, faMinus, faPlus } from '@fortawesome/free-solid-svg-icons';
+import { useVModel } from '@vueuse/core';
+import { computed, PropType, ref, watch } from 'vue';
+import { useI18n } from 'vue-i18n';
+import { useRoute } from 'vue-router';
+
+const props = defineProps({
+  searchFilters: { type: Array<TagSearch>, required: true },
+  currentTags: { type: Array<string>, required: true },
+  tagsIndex: { type: Object as PropType<TagIndex>, required: true },
+  category: { type: Object as PropType<TagNode>, default: null },
+  showCategory: Boolean,
+});
+const emit = defineEmits(['update:searchFilters']);
+const model = useVModel(props, 'searchFilters', emit);
+
+const { t } = useI18n();
+const route = useRoute();
+const galleryStore = useGalleryStore();
+
+const initialTagDisplayLimit = computed(() => {
+  const limit = galleryStore.config?.initialTagDisplayLimit ?? 10;
+  return limit >= 0 ? limit : 1000;
+});
+
+const limit = ref(initialTagDisplayLimit.value);
+
+watch(() => route, () => (limit.value = initialTagDisplayLimit.value));
+
+const propositions = computed<Record<string, number>>(() => {
+  const propositions: Record<string, number> = {};
+  const searchFilters = model.value;
+  if (searchFilters.length > 0) {
+    // Tags count from current search
+    extractDistinctItems(searchFilters)
+      .flatMap(item => item.tags)
+      .map(rightmost)
+      .filter(rawTag => props.tagsIndex[rawTag] && !searchFilters.find(search => search.tag === rawTag))
+      .forEach(rawTag => (propositions[rawTag] = (propositions[rawTag] ?? 0) + 1));
+  } else {
+    // Tags count from the current directory
+    props.currentTags
+      .flatMap(tag => tag.split(':'))
+      .map(tag => props.tagsIndex[tag])
+      .filter(Boolean)
+      .forEach(tagindex => (propositions[tagindex.tag] = tagindex.items.length));
+  }
+  return propositions;
+});
+
+const proposedTags = computed(() => {
+  return Object.entries(propositions.value)
+    .sort((a, b) => b[1] - a[1])
+    .slice(0, limit.value)
+    .map(entry => ({ rawTag: entry[0], count: entry[1] }));
+});
+
+const showMoreCount = computed(() => {
+  return Object.keys(propositions.value).length - Object.keys(proposedTags.value).length;
+});
+
+const title = computed(() => {
+  return props.category?.tag ?? t('panelLeft.propositions.other');
+});
+
+function extractDistinctItems(currentTags: TagSearch[]): Item[] {
+  return [...new Set(currentTags.flatMap(tag => tag.items))];
+}
+
+function rightmost(tag: RawTag): RawTag {
+  const dot = tag.lastIndexOf(':');
+  return dot <= 0 ? tag : tag.substring(dot + 1);
+}
+
+function add(operation: Operation, rawTag: RawTag) {
+  const node = props.tagsIndex[rawTag];
+  const display = props.category ? `${operation}${props.category.tag}:${node.tag}` : `${operation}${node.tag}`;
+  model.value.push({ ...node, parent: props.category, operation, display });
+}
+</script>
+
+<style lang="scss" module>
+@import "~@/assets/scss/theme";
+
+.proposition {
+  .subtitle {
+    background-color: $proposed-category-bgcolor;
+    width: 100%;
+    padding: 0 0 6px 0;
+    margin: 0;
+    text-align: center;
+    font-variant: small-caps;
+  }
+  > div {
+    display: flex;
+    align-items: center;
+    padding-right: 7px;
+    .operationTag {
+      text-overflow: ellipsis;
+      white-space: nowrap;
+      overflow: hidden;
+      flex-grow: 1;
+      cursor: pointer;
+    }
+    .operationBtns {
+      padding: 2px 7px;
+      cursor: pointer;
+    }
+  }
+  .showmore {
+    display: block;
+    text-align: right;
+    color: $palette-300;
+    cursor: pointer;
+    > svg {
+      margin-left: 10px;
+    }
+    &:hover {
+      color: $link-hover;
+    }
+  }
+}
+</style>