Merge pull request #2037 from westim/go-last-change

Fixes #1248: support for '., `., and gi commands.

ROADMAP.md

@@ -145,7 +145,8 @@ Status | Command | Description
 :arrow_down: |    `]		       |  go to the end of the previously operated or put text
 :arrow_down: |    `<		       |  go to the start of the (previous) Visual area
 :arrow_down: |    `>		       |  go to the end of the (previous) Visual area
-:arrow_down: |    `.		       |  go to the position of the last change in this file
+:white_check_mark: |    `.		       |  go to the position of the last change in this file
+:white_check_mark: |    '.		       |  go to the position of the last change in this file
 :arrow_down: |    '{a-zA-Z0-9[]'"<>.} |  same as `, but on the first non-blank in the line
 :arrow_down: | :marks	               |  print the active marks
 :arrow_down: | :1234:  CTRL-O	       |  go to Nth older position in jump list
@@ -221,6 +222,7 @@ Status | Command | Description
 :white_check_mark:    | :1234:  i	| insert text before the cursor (N times) (also: Insert)
 :white_check_mark:    | :1234:  I	| insert text before the first non-blank in the line (N times)
 :white_check_mark:    | :1234:  gI	| insert text in column 1 (N times)
+:white_check_mark:    | gi	| insert at the end of the last change
 :white_check_mark:    | :1234:  o	| open a new line below the current line, append text (N times)
 :white_check_mark:    | :1234:  O	| open a new line above the current line, append text (N times)
 

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;
+    }
+    const 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;
   }