Undo for task creation and reordering

diff --git a/vopamoi.ts b/vopamoi.ts
index 5e645b8f0fb4a849d943b0abbde9537b97475b6d..a88408f639f3c8663ff16d92f38c4476741d93a3 100644 (file)
--- a/vopamoi.ts
+++ b/vopamoi.ts
@@ -40,19 +40,20 @@ const Model = {
     }
   },
 
-  setPriority: function (createTimestamp: string, priority: number) {
+  setPriority: function (createTimestamp: string, priority: number): Element | null {
     const target = this.getTask(createTimestamp);
-    if (!target) return;
+    if (!target) return null;
     target.setAttribute("data-priority", `${priority}`);
     for (const task of document.getElementsByClassName("task")) {
       if (task !== target && this.getPriority(task) > priority) {
         task.parentElement!.insertBefore(target, task);
         target instanceof HTMLElement && target.focus();
-        return;
+        return target;
       }
     }
     document.getElementById("tasks")!.appendChild(target);
     target instanceof HTMLElement && target.focus();
+    return target;
   },
 
   setState: function (stateTimestamp: string, createTimestamp: string, state: string) {
@@ -107,16 +108,26 @@ function Log(prefix: string = "vp-") {
 }
 const log = Log();
 
+const undoLog: string[] = [];
+
 const UI = {
   addTask: function (description: string): Element {
-    return <Element>log.recordAndApply(`${Date.now()} Create ${description}`);
+    const now = Date.now();
+    undoLog.push(`State ${now} deleted`);
+    return <Element>log.recordAndApply(`${now} Create ${description}`);
   },
-  setPriority: function (createTimestamp: string, priority: number) {
-    return log.recordAndApply(`${Date.now()} Priority ${createTimestamp} ${priority}`);
+  setPriority: function (createTimestamp: string, newPriority: number, oldPriority: number) {
+    undoLog.push(`Priority ${createTimestamp} ${oldPriority}`);
+    return log.recordAndApply(`${Date.now()} Priority ${createTimestamp} ${newPriority}`);
   },
   setState: function (createTimestamp: string, state: string) {
     return log.recordAndApply(`${Date.now()} State ${createTimestamp} ${state}`);
   },
+  undo: function () {
+    if (undoLog.length > 0) {
+      return log.recordAndApply(`${Date.now()} ${undoLog.pop()}`);
+    }
+  },
 };
 
 const BrowserUI = {
@@ -195,7 +206,7 @@ const BrowserUI = {
     console.assert(aPriority < newPriority && newPriority < bPriority, aPriority, "<", newPriority, "<", bPriority);
     const newPriorityRounded = Math.round(newPriority);
     const okToRound = aPriority < newPriorityRounded && newPriorityRounded < bPriority;
-    UI.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority);
+    UI.setPriority(task.getAttribute("data-created")!, okToRound ? newPriorityRounded : newPriority, Model.getPriority(task));
   },
 
   setState: function (state: string) {
@@ -203,6 +214,11 @@ const BrowserUI = {
     this.moveCursor(1) || this.moveCursor(-1);
     return UI.setState(createTimestamp!, state);
   },
+
+  undo: function () {
+    const ret = UI.undo();
+    if (ret && ret instanceof HTMLElement) ret.focus();
+  },
 };
 
 function handleKey(event: any) {
@@ -219,6 +235,7 @@ function handleKey(event: any) {
     if (event.key == "d") return BrowserUI.setState("done");
     if (event.key == "c") return BrowserUI.setState("cancelled");
     if (event.key == "X") return BrowserUI.setState("deleted");
+    if (event.key == "u") return BrowserUI.undo();
   }
 }