Merge pull request #2569 from Tyriar/layers6

Move WindowsMode to common/

src/common/WindowsMode.ts

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) 2019 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { CHAR_DATA_CODE_INDEX, NULL_CELL_CODE, WHITESPACE_CELL_CODE } from 'common/buffer/Constants';
+import { IBufferService } from 'common/services/Services';
+
+export function handleWindowsModeLineFeed(bufferService: IBufferService): void {
+  // Winpty does not support wraparound mode which means that lines will never
+  // be marked as wrapped. This causes issues for things like copying a line
+  // retaining the wrapped new line characters or if consumers are listening
+  // in on the data stream.
+  //
+  // The workaround for this is to listen to every incoming line feed and mark
+  // the line as wrapped if the last character in the previous line is not a
+  // space. This is certainly not without its problems, but generally on
+  // Windows when text reaches the end of the terminal it's likely going to be
+  // wrapped.
+  const line = bufferService.buffer.lines.get(bufferService.buffer.ybase + bufferService.buffer.y - 1);
+  const lastChar = line?.get(bufferService.cols - 1);
+
+  const nextLine = bufferService.buffer.lines.get(bufferService.buffer.ybase + bufferService.buffer.y);
+  if (nextLine && lastChar) {
+    nextLine.isWrapped = (lastChar[CHAR_DATA_CODE_INDEX] !== NULL_CELL_CODE && lastChar[CHAR_DATA_CODE_INDEX] !== WHITESPACE_CELL_CODE);
+  }
+}