chore(examples): add routify set-up

examples/routify/src/App.svelte

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+<script>
+  import { Router } from "@sveltech/routify";
+  import { routes } from "../.routify/routes";
+</script>
+
+<Router routes="{routes}" />

examples/routify/src/components/Theme.svelte

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+<script>
+  export let persist = false;
+  export let persistKey = "theme";
+  export let theme = "white";
+  export const themes = ["white", "g10", "g90", "g100"];
+
+  import { onMount, afterUpdate, setContext } from "svelte";
+  import { writable, derived } from "svelte/store";
+
+  const isValidTheme = (value) => themes.includes(value);
+  const isDark = (value) =>
+    isValidTheme(value) && (value === "g90" || value === "g100");
+
+  const carbon_theme = writable(theme);
+  const dark = writable(isDark(theme));
+  const light = derived(dark, (_) => !_);
+
+  const unsubscribe = carbon_theme.subscribe((value) => {
+    theme = value;
+  });
+
+  setContext("Theme", {
+    updateVar: (name, value) => {
+      document.documentElement.style.setProperty(name, value);
+    },
+    carbon_theme,
+    dark,
+    light,
+  });
+
+  onMount(() => {
+    try {
+      const persisted_theme = localStorage.getItem(persistKey);
+
+      if (isValidTheme(persisted_theme)) {
+        carbon_theme.set(persisted_theme);
+      }
+    } catch (error) {
+      console.error(error);
+    }
+
+    return () => {
+      unsubscribe();
+    };
+  });
+
+  afterUpdate(() => {
+    if (isValidTheme(theme)) {
+      document.documentElement.setAttribute("theme", theme);
+      if (persist) {
+        localStorage.setItem(persistKey, theme);
+      }
+    } else {
+      console.warn(
+        `"${theme}" is not a valid Carbon theme. Choose from available themes: ${JSON.stringify(
+          themes
+        )}`
+      );
+    }
+  });
+
+  $: dark.set(isDark(theme));
+</script>
+
+<slot />

examples/routify/src/main.js

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+import HMR from "@sveltech/routify/hmr";
+import App from "./App.svelte";
+
+const app = HMR(App, { target: document.body }, "routify-app");
+
+export default app;

examples/routify/src/pages/_fallback.svelte

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+<script>
+  import { url } from "@sveltech/routify";
+  import { Row, Column, Link } from "carbon-components-svelte";
+</script>
+
+<Row>
+  <Column lg="{16}">
+    <h1>404</h1>
+    <div>
+      Page not found.
+      <Link inline href="{$url('..')}">Return home</Link>
+    </div>
+  </Column>
+</Row>

examples/routify/src/pages/_layout.svelte

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+<script>
+  import { metatags, page } from "@sveltech/routify";
+  import { Content, Grid } from "carbon-components-svelte";
+  import Navigation from "./_navigation.svelte";
+  import Theme from "../components/Theme.svelte";
+</script>
+
+<style lang="scss" global>
+  @import "carbon-components-svelte/css/all";
+</style>
+
+<Theme persist theme="g10">
+  <Navigation />
+  <Content style="background: none; padding: 1rem">
+    <Grid>
+      <slot />
+    </Grid>
+  </Content>
+</Theme>

examples/routify/src/pages/_navigation.svelte

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+<script>
+  import {
+    SkipToContent,
+    Header,
+    HeaderUtilities,
+    HeaderGlobalAction,
+  } from "carbon-components-svelte";
+  import Notification20 from "carbon-icons-svelte/lib/Notification20";
+  import UserAvatar20 from "carbon-icons-svelte/lib/UserAvatar20";
+  import AppSwitcher20 from "carbon-icons-svelte/lib/AppSwitcher20";
+  import { getContext } from "svelte";
+
+  const ctx = getContext("Theme");
+
+  $: if (ctx) {
+    ctx.dark.subscribe((value) => {
+      console.log("dark mode?", value);
+    });
+    ctx.light.subscribe((value) => {
+      console.log("light mode?", value);
+    });
+    ctx.updateVar("--cds-productive-heading-06-font-size", "4rem");
+  }
+</script>
+
+<Header company="IBM" platformName="Carbon Components Svelte" href="/">
+  <div slot="skip-to-content">
+    <SkipToContent />
+  </div>
+  <HeaderUtilities>
+    <HeaderGlobalAction aria-label="Notifications" icon="{Notification20}" />
+    <HeaderGlobalAction aria-label="User Avatar" icon="{UserAvatar20}" />
+    <HeaderGlobalAction aria-label="App Switcher" icon="{AppSwitcher20}" />
+  </HeaderUtilities>
+</Header>

examples/routify/src/pages/index.svelte

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+<script>
+  import {
+    Breadcrumb,
+    BreadcrumbItem,
+    Grid,
+    Row,
+    Column,
+    Tabs,
+    TabContent,
+    Tab,
+    Select,
+    SelectItem,
+  } from "carbon-components-svelte";
+
+  import { getContext } from "svelte";
+
+  const { carbon_theme } = getContext("Theme");
+</script>
+
+<Row>
+  <Column lg="{16}">
+    <Breadcrumb noTrailingSlash aria-label="Page navigation">
+      <BreadcrumbItem href="/">Getting started</BreadcrumbItem>
+    </Breadcrumb>
+    <h1 style="margin-bottom: 1.5rem">Design &amp; build with Carbon</h1>
+  </Column>
+</Row>
+
+<Row>
+  <Column noGutter>
+    <Tabs aria-label="Tab navigation">
+      <Tab label="About" />
+      <Tab label="Design" />
+      <Tab label="Develop" />
+      <div slot="content" class="tabbed-content">
+        <Grid as fullWidth let:props>
+          <TabContent {...props}>
+            <Row>
+              <Column md="{4}" lg="{7}">
+                <Select
+                  labelText="Carbon theme"
+                  bind:selected="{$carbon_theme}"
+                  style="margin-bottom: 1rem">
+                  <SelectItem value="white" text="White" />
+                  <SelectItem value="g10" text="Gray 10" />
+                  <SelectItem value="g90" text="Gray 90" />
+                  <SelectItem value="g100" text="Gray 100" />
+                </Select>
+                <p>
+                  Carbon is IBM’s open-source design system for digital products
+                  and experiences. With the IBM Design Language as its
+                  foundation, the system consists of working code, design tools
+                  and resources, human interface guidelines, and a vibrant
+                  community of contributors.
+                </p>
+              </Column>
+            </Row>
+          </TabContent>
+          <TabContent {...props}>
+            <Row>
+              <Column md="{4}" lg="{7}">
+                <p>
+                  Rapidly build beautiful and accessible experiences. The Carbon
+                  kit contains all resources you need to get started.
+                </p>
+              </Column>
+            </Row>
+          </TabContent>
+          <TabContent {...props}>
+            <Row>
+              <Column md="{4}" lg="{7}">
+                <p>
+                  Carbon provides styles and components in Vanilla, React,
+                  Angular, Vue and Svelte for anyone building on the web.
+                </p>
+              </Column>
+            </Row>
+          </TabContent>
+        </Grid>
+      </div>
+    </Tabs>
+  </Column>
+</Row>