Ely Office: six offline-first desktop apps in Rust and GPUI

ElyDoc, ElyTable, ElyShow (LibreOfficeKit), ElyPDF (MuPDF), ElyTree (Git),
ElyMark (Milkdown and CodeMirror in CEF). ElyMail and ElyAgent follow.

apps/ely-mark/web/src/look.js

@@ -0,0 +1,22 @@
+// The writing view: focus, typewriter, width, font, size (MARK-09).
+
+let typewriter = false
+
+/** Applies `look`; the Markdown never changes. */
+export function apply(look) {
+  const root = document.documentElement
+  root.dataset.focus = look.focus
+  root.dataset.width = look.width
+  root.dataset.font = look.font
+  root.dataset.typewriter = look.typewriter
+  typewriter = look.typewriter
+  const sheet =
+    document.getElementById('ely-look') ??
+    document.head.appendChild(Object.assign(document.createElement('style'), { id: 'ely-look' }))
+  sheet.textContent = `:root { --ely-text-scale: ${look.size / 100}; }`
+}
+
+/** Typewriter scrolling: the caret's line stays mid-view. */
+export function follow(editor) {
+  if (typewriter) editor?.center?.()
+}