src/app/components/ClassifiedActions.svelte

@@ -1,8 +1,10 @@
 <script lang="ts">
+  import {uniq} from "@welshman/lib"
   import type {TrustedEvent, EventContent} from "@welshman/util"
-  import {getTagValue, getAddress} from "@welshman/util"
+  import {getTagValue, getTagValues, getAddress} from "@welshman/util"
   import {pubkey} from "@welshman/app"
   import Pen2 from "@assets/icons/pen-2.svg?dataurl"
+  import {normalizeTopic} from '@lib/util'
   import Link from "@lib/components/Link.svelte"
   import Icon from "@lib/components/Icon.svelte"
   import Button from "@lib/components/Button.svelte"
@@ -27,6 +29,7 @@
   const {url, event, showRoom, showActivity}: Props = $props()
 
   const h = getTagValue("h", event.tags)
+  const topics = getTagValues("t", event.tags)
   const path = makeClassifiedPath(url, getAddress(event))
   const shouldProtect = canEnforceNip70(url)
 
@@ -45,6 +48,13 @@
       Posted in #<RoomName {h} {url} />
     </Link>
   {/if}
+  <div class="flex min-w-0 flex-wrap gap-2">
+    {#each uniq(topics) as topic (topic)}
+      <button type="button" class="btn btn-xs rounded-full font-normal">
+        #{normalizeTopic(topic)}
+      </button>
+    {/each}
+  </div>
   <ReactionSummary {url} {event} {deleteReaction} {createReaction} reactionClass="tooltip-left" />
   <ThunkStatusOrDeleted {event}>
     <ClassifiedStatus {event} />

src/app/components/ClassifiedEdit.svelte

@@ -18,7 +18,8 @@
   const {d, title, status} = fromPairs(event.tags)
   const [_, price = 0, currency = "SAT"] = getTag("price", event.tags) || []
   const images = getTagValues("image", event.tags)
-  const initialValues = {d, title, status, content, price: Number(price), currency, images}
+  const topics = getTagValues("t", event.tags)
+  const initialValues = {d, title, status, content, price: Number(price), currency, images, topics}
 </script>
 
 <ClassifiedForm {url} {initialValues}>

src/app/components/ClassifiedForm.svelte

@@ -1,9 +1,10 @@
 <script lang="ts">
   import type {Snippet} from "svelte"
-  import {randomId} from "@welshman/lib"
+  import {removeUndefined, randomId, uniq} from "@welshman/lib"
   import {makeEvent, CLASSIFIED} from "@welshman/util"
   import {publishThunk} from "@welshman/app"
   import {isMobile, preventDefault} from "@lib/html"
+  import {normalizeTopic} from "@lib/util"
   import AltArrowLeft from "@assets/icons/alt-arrow-left.svg?dataurl"
   import Icon from "@lib/components/Icon.svelte"
   import Field from "@lib/components/Field.svelte"
@@ -14,6 +15,7 @@
   import ModalBody from "@lib/components/ModalBody.svelte"
   import ImagesInput from "@lib/components/ImagesInput.svelte"
   import CurrencyInput from "@app/components/CurrencyInput.svelte"
+  import TopicMultiSelect from "@app/components/TopicMultiSelect.svelte"
   import EditorContent from "@app/editor/EditorContent.svelte"
   import {pushToast} from "@app/util/toast"
   import {PROTECTED} from "@app/core/state"
@@ -32,6 +34,7 @@
       currency?: string
       images?: string[]
       status?: string
+      topics?: string[]
     }
   }
 
@@ -71,6 +74,10 @@
         ...ed.storage.nostr.getEditorTags(),
       ]
 
+      for (const topic of topics) {
+        tags.push(["t", topic])
+      }
+
       if (await shouldProtect) {
         tags.push(PROTECTED)
       }
@@ -118,6 +125,7 @@
   let price = $state(Number(initialValues?.price || 0))
   let currency = $state(initialValues?.currency || "SAT")
   let images = $state<(string | File)[]>(initialValues?.images || [])
+  let topics = $state(uniq(removeUndefined((initialValues?.topics || []).map(normalizeTopic))))
 </script>
 
 <Modal tag="form" onsubmit={preventDefault(submit)}>
@@ -150,6 +158,14 @@
           </div>
         {/snippet}
       </Field>
+      <Field>
+        {#snippet label()}
+          <p>Topics</p>
+        {/snippet}
+        {#snippet input()}
+          <TopicMultiSelect bind:value={topics} />
+        {/snippet}
+      </Field>
       <Field>
         {#snippet label()}
           <p>Price*</p>

src/app/components/CurrencyInput.svelte

@@ -96,6 +96,10 @@
     params={{
       trigger: "manual",
       interactive: true,
+      placement: "bottom",
       getReferenceClientRect: () => wrapper!.getBoundingClientRect(),
+      onShow: (instance: Instance) => {
+        instance.popper.style.width = `${wrapper!.getBoundingClientRect().width + 8}px`
+      },
     }} />
 </button>

src/app/components/ProfileMultiSelect.svelte

@@ -62,7 +62,7 @@
     }
   }
 
-  let input: Element | undefined = $state()
+  let label: Element | undefined = $state()
   let popover: Instance | undefined = $state()
   let instance: any = $state()
 
@@ -92,7 +92,7 @@
       </div>
     {/each}
   </div>
-  <label class="input input-bordered flex w-full items-center gap-2" bind:this={input}>
+  <label class="input input-bordered flex w-full items-center gap-2" bind:this={label}>
     <Icon icon={Magnifier} />
     <!-- svelte-ignore a11y_autofocus -->
     <input
@@ -114,12 +114,15 @@
       select: selectPubkey,
       component: ProfileSuggestion,
       class: "rounded-box",
-      style: `left: 4px; width: ${input?.clientWidth + 12}px`,
+      style: `left: 4px; width: ${label?.clientWidth + 12}px`,
     }}
     params={{
       trigger: "manual",
       interactive: true,
-      maxWidth: "none",
-      getReferenceClientRect: () => input!.getBoundingClientRect(),
+      placement: "bottom",
+      getReferenceClientRect: () => label!.getBoundingClientRect(),
+      onShow: (instance: Instance) => {
+        instance.popper.style.width = `${label!.getBoundingClientRect().width + 8}px`
+      },
     }} />
 </div>

src/app/components/TopicMultiSelect.svelte

@@ -0,0 +1,119 @@
+<script lang="ts">
+  import {writable} from "svelte/store"
+  import type {Writable} from "svelte/store"
+  import type {Instance} from "tippy.js"
+  import {remove, without, uniq} from "@welshman/lib"
+  import {createSearch, topics} from "@welshman/app"
+  import {normalizeTopic} from "@lib/util"
+  import Suggestions from "@lib/components/Suggestions.svelte"
+  import CloseCircle from "@assets/icons/close-circle.svg?dataurl"
+  import Magnifier from "@assets/icons/magnifier.svg?dataurl"
+  import Icon from "@lib/components/Icon.svelte"
+  import Tippy from "@lib/components/Tippy.svelte"
+  import Button from "@lib/components/Button.svelte"
+  import TopicSuggestion from "@app/components/TopicSuggestion.svelte"
+
+  interface Props {
+    value: string[]
+    term?: Writable<string>
+  }
+
+  let {value = $bindable(), term = writable("")}: Props = $props()
+
+  const topicSearch = $derived.by(() =>
+    createSearch(without(value, $topics), {
+      getValue: topic => topic.name,
+      fuseOptions: {
+        keys: ["name"],
+        threshold: 0.4,
+      },
+    }),
+  )
+
+  const addTopic = (text: string) => {
+    const topic = normalizeTopic(text)
+
+    if (topic) {
+      value = uniq([...value, topic])
+    }
+
+    term.set("")
+    popover?.hide()
+  }
+
+  const removeTopic = (topic: string) => {
+    value = remove(topic, value)
+  }
+
+  const onKeyDown = (e: KeyboardEvent) => {
+    if (instance?.onKeyDown(e)) {
+      e.preventDefault()
+      return
+    }
+
+    if (e.key === "Enter" && $term) {
+      e.preventDefault()
+      addTopic($term)
+    }
+  }
+
+  const onBlur = () => {
+    term.set("")
+    popover?.hide()
+  }
+
+  let label: Element | undefined = $state()
+  let popover: Instance | undefined = $state()
+  let instance: any = $state()
+
+  $effect(() => {
+    if ($term.trim()) {
+      popover?.show()
+    } else {
+      popover?.hide()
+    }
+  })
+</script>
+
+<div class="flex flex-col gap-2">
+  <div class="flex flex-wrap gap-2">
+    {#each value as topic (topic)}
+      <div class="badge badge-neutral gap-1">
+        <Button class="flex items-center" onclick={() => removeTopic(topic)}>
+          <Icon icon={CloseCircle} size={4} class="-ml-1 mt-px" />
+        </Button>
+        <span>#{topic}</span>
+      </div>
+    {/each}
+  </div>
+  <label class="input input-bordered flex w-full items-center gap-2" bind:this={label}>
+    <Icon icon={Magnifier} />
+    <input
+      bind:value={$term}
+      class="grow"
+      type="text"
+      placeholder="Add topics..."
+      onkeydown={onKeyDown}
+      onblur={onBlur} />
+  </label>
+  <Tippy
+    bind:popover
+    bind:instance
+    component={Suggestions}
+    props={{
+      term,
+      search: topicSearch.searchValues,
+      select: addTopic,
+      component: TopicSuggestion,
+      allowCreate: true,
+    }}
+    params={{
+      trigger: "manual",
+      interactive: true,
+      placement: "bottom",
+      getReferenceClientRect: () => label!.getBoundingClientRect(),
+      onShow: (instance: Instance) => {
+        instance.popper.style.width = `${label!.getBoundingClientRect().width + 8}px`
+      },
+    }} />
+</div>

src/app/components/TopicSuggestion.svelte

@@ -0,0 +1,9 @@
+<script lang="ts">
+  type Props = {
+    value: string
+  }
+
+  const {value}: Props = $props()
+</script>
+
+<span>#{value}</span>

src/lib/util.ts

@@ -28,3 +28,5 @@ export const buildUrl = (base: string | URL, ...pathname: string[]) => {
 }
 
 export const addPeriod = (s: string) => (s + ".").replace(/\.+$/, ".")
+
+export const normalizeTopic = (topic: string) => topic.trim().replace(/^#+/, "").toLowerCase()