1 files changed, 133 insertions, 0 deletions
diff --git a/packages/ui/src/font-loader.ts b/packages/ui/src/font-loader.ts
new file mode 100644
index 000000000..f2b1e6be1
--- /dev/null
+++ b/packages/ui/src/font-loader.ts
@@ -0,0 +1,133 @@
+type MonoFont = {
+  id: string
+  family: string
+  regular: string
+  bold: string
+}
+
+let files: Record<string, () => Promise<string>> | undefined
+
+function getFiles() {
+  if (files) return files
+  files = import.meta.glob("./assets/fonts/*.woff2", { import: "default" }) as Record<string, () => Promise<string>>
+  return files
+}
+
+export const MONO_NERD_FONTS = [
+  {
+    id: "jetbrains-mono",
+    family: "JetBrains Mono Nerd Font",
+    regular: "./assets/fonts/jetbrains-mono-nerd-font.woff2",
+    bold: "./assets/fonts/jetbrains-mono-nerd-font-bold.woff2",
+  },
+  {
+    id: "fira-code",
+    family: "Fira Code Nerd Font",
+    regular: "./assets/fonts/fira-code-nerd-font.woff2",
+    bold: "./assets/fonts/fira-code-nerd-font-bold.woff2",
+  },
+  {
+    id: "cascadia-code",
+    family: "Cascadia Code Nerd Font",
+    regular: "./assets/fonts/cascadia-code-nerd-font.woff2",
+    bold: "./assets/fonts/cascadia-code-nerd-font-bold.woff2",
+  },
+  {
+    id: "hack",
+    family: "Hack Nerd Font",
+    regular: "./assets/fonts/hack-nerd-font.woff2",
+    bold: "./assets/fonts/hack-nerd-font-bold.woff2",
+  },
+  {
+    id: "source-code-pro",
+    family: "Source Code Pro Nerd Font",
+    regular: "./assets/fonts/source-code-pro-nerd-font.woff2",
+    bold: "./assets/fonts/source-code-pro-nerd-font-bold.woff2",
+  },
+  {
+    id: "inconsolata",
+    family: "Inconsolata Nerd Font",
+    regular: "./assets/fonts/inconsolata-nerd-font.woff2",
+    bold: "./assets/fonts/inconsolata-nerd-font-bold.woff2",
+  },
+  {
+    id: "roboto-mono",
+    family: "Roboto Mono Nerd Font",
+    regular: "./assets/fonts/roboto-mono-nerd-font.woff2",
+    bold: "./assets/fonts/roboto-mono-nerd-font-bold.woff2",
+  },
+  {
+    id: "ubuntu-mono",
+    family: "Ubuntu Mono Nerd Font",
+    regular: "./assets/fonts/ubuntu-mono-nerd-font.woff2",
+    bold: "./assets/fonts/ubuntu-mono-nerd-font-bold.woff2",
+  },
+  {
+    id: "intel-one-mono",
+    family: "Intel One Mono Nerd Font",
+    regular: "./assets/fonts/intel-one-mono-nerd-font.woff2",
+    bold: "./assets/fonts/intel-one-mono-nerd-font-bold.woff2",
+  },
+  {
+    id: "meslo-lgs",
+    family: "Meslo LGS Nerd Font",
+    regular: "./assets/fonts/meslo-lgs-nerd-font.woff2",
+    bold: "./assets/fonts/meslo-lgs-nerd-font-bold.woff2",
+  },
+  {
+    id: "iosevka",
+    family: "Iosevka Nerd Font",
+    regular: "./assets/fonts/iosevka-nerd-font.woff2",
+    bold: "./assets/fonts/iosevka-nerd-font-bold.woff2",
+  },
+  {
+    id: "geist-mono",
+    family: "GeistMono Nerd Font",
+    regular: "./assets/fonts/GeistMonoNerdFontMono-Regular.woff2",
+    bold: "./assets/fonts/GeistMonoNerdFontMono-Bold.woff2",
+  },
+] satisfies MonoFont[]
+
+const mono = Object.fromEntries(MONO_NERD_FONTS.map((font) => [font.id, font])) as Record<string, MonoFont>
+const loads = new Map<string, Promise<void>>()
+
+function css(font: { family: string; regular: string; bold: string }) {
+  return `
+    @font-face {
+      font-family: "${font.family}";
+      src: url("${font.regular}") format("woff2");
+      font-display: swap;
+      font-style: normal;
+      font-weight: 400;
+    }
+    @font-face {
+      font-family: "${font.family}";
+      src: url("${font.bold}") format("woff2");
+      font-display: swap;
+      font-style: normal;
+      font-weight: 700;
+    }
+  `
+}
+
+export function ensureMonoFont(id: string | undefined) {
+  if (!id || id === "ibm-plex-mono") return Promise.resolve()
+  if (typeof document !== "object") return Promise.resolve()
+  const font = mono[id]
+  if (!font) return Promise.resolve()
+  const styleId = `oc-font-${font.id}`
+  if (document.getElementById(styleId)) return Promise.resolve()
+  const hit = loads.get(font.id)
+  if (hit) return hit
+  const files = getFiles()
+  const load = Promise.all([files[font.regular]?.(), files[font.bold]?.()]).then(([regular, bold]) => {
+    if (!regular || !bold) return
+    if (document.getElementById(styleId)) return
+    const style = document.createElement("style")
+    style.id = styleId
+    style.textContent = css({ family: font.family, regular, bold })
+    document.head.appendChild(style)
+  })
+  loads.set(font.id, load)
+  return load
+}