Give a space with no icon a colored tile with its initials (#428)

src/app/components/ChatMessage.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
   import cx from "classnames"
-  import {hash, formatTimestampAsTime} from "@welshman/lib"
+  import {formatTimestampAsTime} from "@welshman/lib"
   import type {Maybe} from "@welshman/lib"
   import type {TrustedEvent, EventContent} from "@welshman/util"
   import {Thunks} from "@welshman/app"
@@ -21,7 +21,7 @@
   import ChatMessageMenu from "@app/components/ChatMessageMenu.svelte"
   import ChatMessageMenuMobile from "@app/components/ChatMessageMenuMobile.svelte"
   import {app, profiles, user} from "@app/core"
-  import {colors} from "@app/theme"
+  import {colorFor} from "@app/theme"
   import {pushModal} from "@app/modal"
 
   interface Props {
@@ -40,7 +40,7 @@
   const profileDisplay = $profiles.display(event.pubkey).$
   const thunks = $app.use(Thunks).history
   const thunk = $app.use(Thunks).merge($thunks.filter(t => t.event.id === event.id))
-  const [_, colorValue] = colors[hash(event.pubkey) % colors.length]
+  const colorValue = colorFor(event.pubkey)
 
   const reply = () => replyTo(event)
   const edit = canEdit?.(event) ? () => onEdit?.(event) : undefined

src/app/components/RelayIcon.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
-  import Server from "@assets/icons/server.svg?dataurl"
   import ImageIcon from "@lib/components/ImageIcon.svelte"
   import {relays} from "@app/core"
+  import {relayIconColor, relayIconInitials} from "@app/relays"
 
   type Props = {
     url: string
@@ -12,10 +12,20 @@
   const {url, size = 7, ...props}: Props = $props()
 
   const relay = $relays.one(url)
+
+  const rem = $derived(size * 0.25)
+
+  const fallbackStyle = $derived(
+    `width: ${rem}rem; height: ${rem}rem; min-width: ${rem}rem; min-height: ${rem}rem; font-size: ${rem * 0.4}rem; background-color: ${relayIconColor(url)}; color: white`,
+  )
 </script>
 
 {#if $relay?.icon}
   <ImageIcon {size} alt="" src={$relay?.icon} class="rounded-full {props.class}" />
 {:else}
-  <ImageIcon size={size - 2} alt="" src={Server} class={props.class} />
+  <div
+    class="flex select-none items-center justify-center rounded-full font-bold {props.class}"
+    style={fallbackStyle}>
+    {relayIconInitials(url)}
+  </div>
 {/if}

src/app/components/RelaySummary.svelte

@@ -26,7 +26,7 @@
         <div class="relative">
           <div
             class="flex justify-center items-center h-12 w-12 min-w-12 rounded-full border-2 border-solid bg-surface-more border-line">
-            <RelayIcon {url} size={10} class="rounded-full" />
+            <RelayIcon {url} size={10} />
           </div>
         </div>
         {#if !hideFavorites && $userSpaceUrls.includes(url)}

src/app/components/RoomItem.svelte

@@ -2,7 +2,6 @@
   import cx from "classnames"
   import {readable} from "svelte/store"
   import {
-    hash,
     gte,
     now,
     uniq,
@@ -40,7 +39,7 @@
   import RoomItemContent from "@app/components/RoomItemContent.svelte"
   import {profiles, thunks, user} from "@app/core"
   import {noThunks, thunksByEventId} from "@app/thunks"
-  import {colors} from "@app/theme"
+  import {colorFor} from "@app/theme"
   import {ENABLE_ZAPS} from "@app/env"
   import type {FeedContext} from "@app/feeds"
   import {deriveEvent, deriveEventsForUrl} from "@app/repository"
@@ -71,7 +70,7 @@
   const today = formatTimestampAsDate(now())
   const profileDisplay = $profiles.display(event.pubkey, [url]).$
   const thunk = $derived($thunks.merge($thunksByEventId.get(event.id) ?? noThunks))
-  const [_, colorValue] = colors[hash(event.pubkey) % colors.length]
+  const colorValue = colorFor(event.pubkey)
 
   const qTag = matchTag(tagSpec("q"), event.tags)
   const isQuoteOnly = Boolean(

src/app/relays.ts

@@ -6,6 +6,7 @@ import {throttled} from "@welshman/store"
 import {checkRelayHasLivekit} from "$lib/livekit"
 import {app} from "@app/core"
 import {relaysMostlyRestricted} from "@app/policies"
+import {colorFor} from "@app/theme"
 
 export const encodeRelay = (url: string) =>
   encodeURIComponent(
@@ -16,6 +17,23 @@ export const encodeRelay = (url: string) =>
 
 export const decodeRelay = (url: string) => normalizeRelayUrl(decodeURIComponent(url))
 
+const relayIconHost = (url: string) =>
+  normalizeRelayUrl(url)
+    .replace(/^wss?:\/\//, "")
+    .replace(/[:/].*$/, "")
+
+// Darkened so white initials clear 4.5:1 on every color in the palette.
+export const relayIconColor = (url: string) =>
+  `color-mix(in oklab, ${colorFor(relayIconHost(url))} 80%, black)`
+
+export const relayIconInitials = (url: string) => {
+  const parts = relayIconHost(url).split(".")
+  const hasSubdomain = parts.length > 2
+  const [first = "", second = ""] = parts
+
+  return (hasSubdomain ? first.slice(0, 1) + second.slice(0, 1) : first.slice(0, 2)).toUpperCase()
+}
+
 export const deriveSocket = (url: string) => {
   const socket = app.get().pool.get(url)
 

src/app/theme.ts

@@ -1,31 +1,34 @@
 import twColors from "tailwindcss/colors"
 import {derived, readable} from "svelte/store"
+import {hash} from "@welshman/lib"
 import {synced} from "@welshman/store"
 import {FL_THEME} from "@app/env"
 import {kv} from "@app/storage"
 
-export const colors = [
+const colors = [
-  ["amber", twColors.amber[600]],
+  twColors.amber[600],
-  ["blue", twColors.blue[600]],
+  twColors.blue[600],
-  ["cyan", twColors.cyan[600]],
+  twColors.cyan[600],
-  ["emerald", twColors.emerald[600]],
+  twColors.emerald[600],
-  ["fuchsia", twColors.fuchsia[600]],
+  twColors.fuchsia[600],
-  ["green", twColors.green[600]],
+  twColors.green[600],
-  ["indigo", twColors.indigo[600]],
+  twColors.indigo[600],
-  ["sky", twColors.sky[600]],
+  twColors.sky[600],
-  ["lime", twColors.lime[600]],
+  twColors.lime[600],
-  ["orange", twColors.orange[600]],
+  twColors.orange[600],
-  ["pink", twColors.pink[600]],
+  twColors.pink[600],
-  ["purple", twColors.purple[600]],
+  twColors.purple[600],
-  ["red", twColors.red[600]],
+  twColors.red[600],
-  ["rose", twColors.rose[600]],
+  twColors.rose[600],
-  ["sky", twColors.sky[600]],
+  twColors.sky[600],
-  ["teal", twColors.teal[600]],
+  twColors.teal[600],
-  ["violet", twColors.violet[600]],
+  twColors.violet[600],
-  ["yellow", twColors.yellow[600]],
+  twColors.yellow[600],
-  ["zinc", twColors.zinc[600]],
+  twColors.zinc[600],
 ]
 
+export const colorFor = (value: string) => colors[hash(value) % colors.length]
+
 // Every theme with token values in lib/components/theme.css
 export const flThemes = ["clay", "flat", "navy"]
 

src/routes/spaces/[relay]/about/+page.svelte

@@ -31,7 +31,7 @@
   <div class="card flex flex-col gap-4">
     <div class="relative flex gap-4">
       <div class="relative">
-        <RelayIcon {url} size={14} class="rounded-full" />
+        <RelayIcon {url} size={14} />
       </div>
       <div class="flex min-w-0 flex-col">
         <h1 class="truncate min-w-0 whitespace-nowrap">