move commands again

packages/core/src/commands/focus.ts

@@ -0,0 +1,58 @@
+import { TextSelection } from 'prosemirror-state'
+import { Editor, Command } from '../Editor'
+import minMax from '../utils/minMax'
+
+type Position = 'start' | 'end' | number | boolean | null
+
+interface ResolvedSelection {
+  from: number,
+  to: number,
+}
+
+function resolveSelection(editor: Editor, position: Position = null): ResolvedSelection {
+  if (position === null) {
+    return editor.selection
+  }
+
+  if (position === 'start' || position === true) {
+    return {
+      from: 0,
+      to: 0,
+    }
+  }
+
+  if (position === 'end') {
+    const { size } = editor.state.doc.content
+
+    return {
+      from: size,
+      to: size - 1, // TODO: -1 only for nodes with content
+    }
+  }
+
+  return {
+    from: position as number,
+    to: position as number,
+  }
+}
+
+export default (position: Position = null): Command => ({
+  editor, view, tr, dispatch,
+}) => {
+  if ((view.hasFocus() && position === null) || position === false) {
+    return true
+  }
+
+  const { from, to } = resolveSelection(editor, position)
+  const { doc } = tr
+  const resolvedFrom = minMax(from, 0, doc.content.size)
+  const resolvedEnd = minMax(to, 0, doc.content.size)
+  const selection = TextSelection.create(doc, resolvedFrom, resolvedEnd)
+
+  if (dispatch) {
+    tr.setSelection(selection)
+    view.focus()
+  }
+
+  return true
+}