8 files changed, 96 insertions, 27 deletions

diff --git a/viewer/src/@types/tag.d.ts b/viewer/src/@types/tag.d.ts
index a390c80..425a995 100644
--- a/viewer/src/@types/tag.d.ts
+++ b/viewer/src/@types/tag.d.ts
@@ -31,4 +31,9 @@ declare namespace Tag {
     }
     type SearchByOperation = { [index: string]: Tag.Search[] };
     type Index = { [index: string]: Node };
+
+    interface Category {
+        tag: string;
+        index: Index;
+    }
 }
diff --git a/viewer/src/assets/scss/global.scss b/viewer/src/assets/scss/global.scss
index bd7a7e7..a8a42a1 100644
--- a/viewer/src/assets/scss/global.scss
+++ b/viewer/src/assets/scss/global.scss
@@ -85,8 +85,8 @@ button svg + span {
   overflow: auto;
 }
 .scrollbar::-webkit-scrollbar {
-  width: 10px;
-  height: 10px;
+  width: $scrollbar_width;
+  height: $scrollbar_width;
 }
 .scrollbar::-webkit-scrollbar-corner {
   background-color: transparent;
diff --git a/viewer/src/assets/scss/theme.scss b/viewer/src/assets/scss/theme.scss
index 26cb355..35983a7 100644
--- a/viewer/src/assets/scss/theme.scss
+++ b/viewer/src/assets/scss/theme.scss
@@ -42,6 +42,8 @@ $radius: 0;
 $loading-background: $palette-800;
 $title-color: $palette-200;
 $title-size: $size-5;
+$subtitle-color: $palette-200;
+$subtitle-size: $size-5;
 $tag-background-color: $palette-800;
 $button-color: $palette-100;
 $button-active-color: $palette-100;
@@ -61,11 +63,13 @@ $panel-left-txtcolor: $primary;
 $command-buttons-bgcolor: $palette-700;
 $content-bgcolor: $palette-900;
 $scrollbar-color: $palette-300;
+$scrollbar_width: 10px;
 $loader-color: $palette-800;
 $input-tag-delete-background-color: $palette-700;
 $breadcrumb-margins: 12px;
 $breadcrumb-overflow-mask-size: $breadcrumb-margins + 60px;
 $thumbnail-other-size: 120px;
+$proposed-category-bgcolor: $palette-700;
 
 // Layout
 
diff --git a/viewer/src/components/LdProposition.vue b/viewer/src/components/LdProposition.vue
index 3357777..1a1d387 100644
--- a/viewer/src/components/LdProposition.vue
+++ b/viewer/src/components/LdProposition.vue
@@ -19,8 +19,12 @@
 -->
 
 <template>
-  <div>
-    <div v-for="proposed in proposedTags" :key="proposed.rawTag" class="proposition">
+  <div class="proposition">
+    <h2
+      v-if="showTitle && proposedTags.length"
+      class="subtitle category"
+    >{{title || $t('panelLeft.propositions.other')}}</h2>
+    <div v-for="proposed in proposedTags" :key="proposed.rawTag">
       <a
         class="operation-btns link"
         :title="$t('tag-propositions.substraction')"
@@ -54,6 +58,8 @@ import { Operation } from "@/@types/Operation";
 
 @Component
 export default class LdProposition extends Vue {
+  @Prop({ type: String, required: true }) readonly title!: string;
+  @Prop({ type: Boolean, required: true }) readonly showTitle!: boolean;
   @Prop({ type: Array, required: true }) readonly currentTags!: string[];
   @Prop({ required: true }) readonly tagsIndex!: Tag.Index;
   @PropSync("searchFilters", { type: Array, required: true }) model!: Tag.Search[];
@@ -69,13 +75,14 @@ export default class LdProposition extends Vue {
       this.extractDistinctItems(this.model)
         .flatMap(item => item.tags)
         .map(this.rightmost)
-        .filter(rawTag => !this.model.find(search => search.tag === rawTag))
+        .filter(rawTag => this.tagsIndex[rawTag] && !this.model.find(search => search.tag === rawTag))
         .forEach(rawTag => (propositions[rawTag] = (propositions[rawTag] ?? 0) + 1));
     } else {
       // Tags count from the current directory
       this.currentTags
         .flatMap(tag => tag.split(":"))
         .map(tag => this.tagsIndex[tag])
+        .filter(Boolean)
         .forEach(tagindex => (propositions[tagindex.tag] = tagindex.items.length));
     }
 
@@ -105,19 +112,29 @@ export default class LdProposition extends Vue {
 @import "@/assets/scss/theme.scss";
 
 .proposition {
-  display: flex;
-  align-items: center;
-  padding-right: 7px;
-  .operation-tag {
-    text-overflow: ellipsis;
-    white-space: nowrap;
-    overflow: hidden;
-    flex-grow: 1;
-    cursor: pointer;
+  .subtitle {
+    background-color: $proposed-category-bgcolor;
+    width: 100%;
+    padding: 0 0 6px 0;
+    margin: 0;
+    text-align: center;
+    font-variant: small-caps;
   }
-  .operation-btns {
-    padding: 2px 7px;
-    cursor: pointer;
+  > div {
+    display: flex;
+    align-items: center;
+    padding-right: 7px;
+    .operation-tag {
+      text-overflow: ellipsis;
+      white-space: nowrap;
+      overflow: hidden;
+      flex-grow: 1;
+      cursor: pointer;
+    }
+    .operation-btns {
+      padding: 2px 7px;
+      cursor: pointer;
+    }
   }
 }
 </style>
diff --git a/viewer/src/locales/en.json b/viewer/src/locales/en.json
index 58adcd2..4209a67 100644
--- a/viewer/src/locales/en.json
+++ b/viewer/src/locales/en.json
@@ -14,5 +14,6 @@
   "command.search.search": "Search",
   "command.back": "Go back",
   "command.parent": "Go to parent directory",
-  "directory.no-results": "Empty directory"
-}
+  "directory.no-results": "Empty directory",
+  "panelLeft.propositions.other": "other filters"
+}
\ No newline at end of file
diff --git a/viewer/src/services/indexfactory.ts b/viewer/src/services/indexfactory.ts
index a31f3ef..466b509 100644
--- a/viewer/src/services/indexfactory.ts
+++ b/viewer/src/services/indexfactory.ts
@@ -112,4 +112,23 @@ export default class IndexFactory {
     if (strict) return node.tagfiltered === filter;
     return node.tagfiltered.includes(filter)
   }
+
+  // ---
+
+  public static generateCategories(tagsIndex: Tag.Index, tags?: Gallery.RawTag[]): Tag.Category[] {
+    if (!tags?.length) return [{ tag: "", index: tagsIndex }];
+
+    const tagsCategories: Tag.Category[] = [];
+    const tagsRemaining = new Map(Object.entries(tagsIndex));
+    tags
+      .map(tag => ({ tag, index: tagsIndex[tag]?.children }))
+      .filter(category => category.index && Object.keys(category.index).length)
+      .forEach(category => {
+        tagsCategories.push(category);
+        tagsRemaining.delete(category.tag);
+        Object.values(category.index).map(node => node.tag).forEach(tag => tagsRemaining.delete(tag));
+      });
+    tagsCategories.push({ tag: "", index: Object.fromEntries(tagsRemaining) });
+    return tagsCategories;
+  }
 }
diff --git a/viewer/src/store/galleryStore.ts b/viewer/src/store/galleryStore.ts
index 4a5de0f..352a266 100644
--- a/viewer/src/store/galleryStore.ts
+++ b/viewer/src/store/galleryStore.ts
@@ -31,6 +31,7 @@ export default class GalleryStore extends VuexModule {
     config: Gallery.Config | null = null;
     galleryIndex: Gallery.Index | null = null;
     tagsIndex: Tag.Index = {};
+    tagsCategories: Tag.Category[] = [];
     currentPath: string = "/";
     currentSearch: Tag.Search[] = [];
 
@@ -48,6 +49,10 @@ export default class GalleryStore extends VuexModule {
         this.tagsIndex = Object.freeze(tagsIndex);
     }
 
+    @mutation private setTagsCategories(tagsCategories: Tag.Category[]) {
+        this.tagsCategories = tagsCategories;
+    }
+
     @mutation setCurrentPath(currentPath: string) {
         this.currentPath = currentPath;
     }
@@ -89,7 +94,8 @@ export default class GalleryStore extends VuexModule {
         return fetch(`${process.env.VUE_APP_DATA_URL}${root}index.json`, { cache: "no-cache" })