Added commands for 'go to last change' and 'insert at last change'.

src/actions/commands/actions.ts

@@ -2119,6 +2119,39 @@ class CommandGoForwardInChangelist extends BaseCommand {
   }
 }
 
+@RegisterAction
+class CommandGoLastChange extends BaseCommand {
+  modes = [ModeName.Normal];
+  keys = [['`', '.'], ["'", '.']];
+
+  public async exec(position: Position, vimState: VimState): Promise<VimState> {
+    const lastPos = vimState.historyTracker.getLastHistoryStartPosition();
+
+    if (lastPos !== undefined) {
+      vimState.cursorPosition = lastPos[0];
+    }
+
+    return vimState;
+  }
+}
+
+@RegisterAction
+class CommandInsertAtLastChange extends BaseCommand {
+  modes = [ModeName.Normal];
+  keys = ['g', 'i'];
+
+  public async exec(position: Position, vimState: VimState): Promise<VimState> {
+    const lastPos = vimState.historyTracker.getLastChangeEndPosition();
+
+    if (lastPos !== undefined) {
+      vimState.cursorPosition = lastPos;
+      vimState.currentMode = ModeName.Insert;
+    }
+
+    return vimState;
+  }
+}
+
 @RegisterAction
 export class CommandInsertAtFirstCharacter extends BaseCommand {
   modes = [ModeName.Normal, ModeName.Visual];

src/history/historyTracker.ts

@@ -548,6 +548,31 @@ export class HistoryTracker {
     return this.historySteps[this.currentHistoryStepIndex].cursorEnd;
   }
 
+  /**
+   * Gets the ending cursor position of the last Change of the last Step.
+   *
+   * In practice, this sets the cursor position to the end of
+   * the most recent text change.
+   */
+  getLastChangeEndPosition(): Position | undefined {
+    if (this.currentHistoryStepIndex === 0) {
+      return undefined;
+    }
+    let lastChangeIndex = this.historySteps[this.currentHistoryStepIndex].changes.length;
+    if (lastChangeIndex === 0) {
+      return undefined;
+    }
+    return this.historySteps[this.currentHistoryStepIndex].changes[lastChangeIndex - 1].end();
+  }
+
+  getLastHistoryStartPosition(): Position[] | undefined {
+    if (this.currentHistoryStepIndex === 0) {
+      return undefined;
+    }
+
+    return this.historySteps[this.currentHistoryStepIndex].cursorStart;
+  }
+
   setLastHistoryEndPosition(pos: Position[]) {
     this.historySteps[this.currentHistoryStepIndex].cursorEnd = pos;
   }