Make 'y0' yank up to the start of the logical line in VI mode. (#1167)

Author: springcomp

PSReadLine/YankPaste.vi.cs

@@ -251,10 +251,12 @@ public static void ViYankEndOfGlob(ConsoleKeyInfo? key = null, object arg = null
         /// </summary>
         public static void ViYankBeginningOfLine(ConsoleKeyInfo? key = null, object arg = null)
         {
-            int length = _singleton._current;
+            var start = GetBeginningOfLinePos(_singleton._current);
+            var length = _singleton._current - start; 
             if (length > 0)
             {
-                _singleton.SaveToClipboard(0, length);
+                _clipboard.Record(_singleton._buffer, start, length);
+                _singleton.MoveCursor(start);
             }
         }
 

test/YankPasteTest.VI.cs

@@ -324,16 +324,23 @@ public void ViPasteAfterYankBeginningOfLine()
         {
             TestSetup(KeyMode.Vi);
 
+            var continuationPrefixLength = PSConsoleReadLineOptions.DefaultContinuationPrompt.Length;
+
             Test("012", Keys(
                 "012", _.Escape,
-                "y0P", CheckThat(() => AssertLineIs("01012")), CheckThat(() => AssertCursorLeftIs(3)),
+                "y0P", CheckThat(() => AssertLineIs("01012")), CheckThat(() => AssertCursorLeftIs(1)),
                 "u"
                 ));
 
-            Test(" 123  ", Keys(
-                " 123  ", _.Escape,
-                "y0P", CheckThat(() => AssertLineIs(" 123  123  ")), CheckThat(() => AssertCursorLeftIs(9)),
-                "u"
+            Test("\"\nHello\n World!\n\"", Keys(
+                _.DQuote, _.Enter,
+                "Hello", _.Enter,
+                " World!", _.Enter,
+                _.DQuote, _.Escape,
+                _.k, "5l", // move the cursor to the 'd' character of "World!"
+                "y0", CheckThat(() => AssertCursorLeftIs(continuationPrefixLength + 0)),
+                "P", CheckThat(() => AssertLineIs("\"\nHello\n Worl World!\n\"")), CheckThat(() => AssertCursorLeftIs(continuationPrefixLength + 4)),
+                "u", CheckThat(() => AssertCursorLeftIs(continuationPrefixLength + 0))
                 ));
         }