43 lines
1.1 KiB
TypeScript
43 lines
1.1 KiB
TypeScript
import type { Command } from "./command";
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import { commandIds } from "./ids";
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export const historyUndoCommand: Command = {
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id: commandIds.historyUndo,
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name: "Undo",
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execute({ state }) {
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const previous = state.history.past.at(-1);
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if (!previous) return state;
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return {
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...state,
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document: previous.document,
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editor: previous.editor,
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history: {
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past: state.history.past.slice(0, -1),
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future: [{ document: state.document, editor: state.editor }, ...state.history.future],
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},
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};
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},
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};
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export const historyRedoCommand: Command = {
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id: commandIds.historyRedo,
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name: "Redo",
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execute({ state }) {
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const next = state.history.future[0];
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if (!next) return state;
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return {
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...state,
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document: next.document,
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editor: next.editor,
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history: {
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past: [...state.history.past, { document: state.document, editor: state.editor }],
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future: state.history.future.slice(1),
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},
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};
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},
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};
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export const historyCommands = [historyUndoCommand, historyRedoCommand] satisfies Command<unknown>[];
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