Improve Cut and Paste

app/src/protyle/undo/index.ts

@@ -4,6 +4,7 @@ import {Constants} from "../../constants";
 import {hideElements} from "../ui/hideElements";
 import {scrollCenter} from "../../util/highlightById";
 import {matchHotKey} from "../util/hotKey";
+import {fetchSyncPost} from "../../util/fetch";
 import {ipcRenderer} from "electron";
 
 interface IOperations {
@@ -64,9 +65,72 @@ export class Undo {
         }
     }
 
-    private render(protyle: IProtyle, state: IOperations, redo: boolean) {
+    // 重放 insert 操作前检查块 ID 是否已被占用(例如剪切后粘贴到其他编辑器时保留了原 ID,
+    // 此时撤销剪切会插入重复 ID 的块),冲突时在两个栈中统一替换为新 ID
+    private async resolveDuplicateIds(operations: IOperation[]) {
+        const ids = new Set<string>();
+        operations.forEach(op => {
+            if (op.action === "insert" && typeof op.data === "string") {
+                if (op.id) {
+                    ids.add(op.id);
+                }
+                op.data.match(/data-node-id="[^"]+"/g)?.forEach((match: string) => {
+                    ids.add(match.substring(14, match.length - 1));
+                });
+            }
+        });
+        if (ids.size === 0) {
+            return;
+        }
+        let existResponse: IWebSocketData;
+        try {
+            existResponse = await fetchSyncPost("/api/block/checkBlocksExist", {ids: Array.from(ids)});
+        } catch (e) {
+            return;
+        }
+        if (!existResponse?.data) {
+            return;
+        }
+        const replacements: [string, string][] = [];
+        ids.forEach(id => {
+            if (existResponse.data[id] === true) {
+                replacements.push([id, Lute.NewNodeID()]);
+            }
+        });
+        if (replacements.length === 0) {
+            return;
+        }
+        [this.undoStack, this.redoStack].forEach(stack => {
+            stack.forEach(item => {
+                [item.doOperations, item.undoOperations].forEach(ops => {
+                    ops.forEach(op => {
+                        replacements.forEach(([oldId, newId]) => {
+                            if (op.id === oldId) {
+                                op.id = newId;
+                            }
+                            if (op.parentID === oldId) {
+                                op.parentID = newId;
+                            }
+                            if (op.previousID === oldId) {
+                                op.previousID = newId;
+                            }
+                            if (op.nextID === oldId) {
+                                op.nextID = newId;
+                            }
+                            if (typeof op.data === "string") {
+                                op.data = op.data.split(`data-node-id="${oldId}"`).join(`data-node-id="${newId}"`);
+                            }
+                        });
+                    });
+                });
+            });
+        });
+    }
+
+    private async render(protyle: IProtyle, state: IOperations, redo: boolean) {
         hideElements(["hint", "gutter"], protyle);
         protyle.wysiwyg.lastHTMLs = {};
+        await this.resolveDuplicateIds(redo ? state.doOperations : state.undoOperations);
         if (!redo) {
             for (let i = state.undoOperations.length - 1; i >= 0; i--) {
                 if (state.undoOperations[i].action === "insert") {

app/src/protyle/util/paste.ts

@@ -6,7 +6,7 @@ import {hasClosestBlock, hasClosestByAttribute, hasClosestByClassName} from "./h
 import {getEditorRange} from "./selection";
 import {blockRender} from "../render/blockRender";
 import {highlightRender} from "../render/highlightRender";
-import {fetchPost} from "../../util/fetch";
+import {fetchPost, fetchSyncPost} from "../../util/fetch";
 import {isDynamicRef, isFileAnnotation} from "../../util/functions";
 import {insertHTML} from "./insertHTML";
 import {scrollCenter} from "../../util/highlightById";
@@ -457,12 +457,23 @@ export const paste = async (protyle: IProtyle, event: (ClipboardEvent | DragEven
             }
         }
         let isBlock = false;
-        tempElement.querySelectorAll("[data-node-id]").forEach((e) => {
-            const newId = Lute.NewNodeID();
-            e.setAttribute("data-node-id", newId);
-            clearBlockElement(e);
+        const pastedBlockElements = tempElement.querySelectorAll("[data-node-id]");
+        if (pastedBlockElements.length > 0) {
             isBlock = true;
-        });
+            // 剪切后粘贴时原块已被删除,保留原 ID 可避免该块被其他位置的引用失效;
+            // 仅当 ID 仍存在(复制粘贴)时才生成新 ID
+            const oldIds: string[] = [];
+            pastedBlockElements.forEach((e) => {
+                oldIds.push(e.getAttribute("data-node-id"));
+            });
+            const existResponse = await fetchSyncPost("/api/block/checkBlocksExist", {ids: oldIds});
+            pastedBlockElements.forEach((e) => {
+                if (existResponse.data[e.getAttribute("data-node-id")] !== false) {
+                    e.setAttribute("data-node-id", Lute.NewNodeID());
+                }
+                clearBlockElement(e);
+            });
+        }
         if (nodeElement.classList.contains("table")) {
             isBlock = false;
         }

kernel/api/block.go

@@ -23,6 +23,7 @@ import (
 	"strings"
 
 	"github.com/88250/gulu"
+	"github.com/88250/lute/ast"
 	"github.com/88250/lute/html"
 	"github.com/gin-gonic/gin"
 	"github.com/siyuan-note/logging"
@@ -382,6 +383,25 @@ func checkBlockExist(c *gin.Context) {
 	ret.Data = nil != b
 }
 
+func checkBlocksExist(c *gin.Context) {
+	ret := gulu.Ret.NewResult()
+	defer c.JSON(http.StatusOK, ret)
+
+	arg, ok := util.JsonArg(c, ret)
+	if !ok {
+		return
+	}
+
+	idsArg := arg["ids"].([]interface{})
+	var ids []string
+	for _, idArg := range idsArg {
+		if id, idOk := idArg.(string); idOk && ast.IsNodeIDPattern(id) {
+			ids = append(ids, id)
+		}
+	}
+	ret.Data = treenode.ExistBlockTrees(ids)
+}
+
 func getDocInfo(c *gin.Context) {
 	ret := gulu.Ret.NewResult()
 	defer c.JSON(http.StatusOK, ret)

kernel/api/router.go

@@ -227,6 +227,7 @@ func ServeAPI(ginServer *gin.Engine) {
 	ginServer.Handle("POST", "/api/block/getDocInfo", model.CheckAuth, getDocInfo)
 	ginServer.Handle("POST", "/api/block/getDocsInfo", model.CheckAuth, getDocsInfo)
 	ginServer.Handle("POST", "/api/block/checkBlockExist", model.CheckAuth, checkBlockExist)
+	ginServer.Handle("POST", "/api/block/checkBlocksExist", model.CheckAuth, checkBlocksExist)
 	ginServer.Handle("POST", "/api/block/getUnfoldedParentID", model.CheckAuth, getUnfoldedParentID)
 	ginServer.Handle("POST", "/api/block/checkBlockFold", model.CheckAuth, checkBlockFold)
 	ginServer.Handle("POST", "/api/block/insertBlock", model.CheckAuth, model.CheckAdminRole, model.CheckReadonly, insertBlock)