Add special paste behavior when copying/cutting w/ no selection

spec/text-editor-spec.coffee

@@ -2747,6 +2747,39 @@ describe "TextEditor", ->
               expect(editor.lineTextForBufferRow(0)).toBe "var quicksort"
               expect(editor.lineTextForBufferRow(1)).toBe "sort = function () {"
 
+        describe "when a full line was cut", ->
+          beforeEach ->
+            editor.setCursorBufferPosition([2, 13])
+            editor.cutSelectedText()
+            editor.setCursorBufferPosition([2, 13])
+
+          it "pastes the line above the cursor and retains the cursor's column", ->
+            editor.pasteText()
+            expect(editor.lineTextForBufferRow(2)).toBe("    if (items.length <= 1) return items;")
+            expect(editor.lineTextForBufferRow(3)).toBe("    var pivot = items.shift(), current, left = [], right = [];")
+            expect(editor.getCursorBufferPosition()).toEqual([3, 13])
+
+        describe "when a full line was copied", ->
+          beforeEach ->
+            editor.setCursorBufferPosition([2, 13])
+            editor.copySelectedText()
+
+          describe "when there is a selection", ->
+            it "overwrites the selection as with any copied text", ->
+              editor.setSelectedBufferRange([[1, 2], [1, Infinity]])
+              editor.pasteText()
+              expect(editor.lineTextForBufferRow(1)).toBe("  if (items.length <= 1) return items;")
+              expect(editor.lineTextForBufferRow(2)).toBe("  ")
+              expect(editor.lineTextForBufferRow(3)).toBe("    if (items.length <= 1) return items;")
+              expect(editor.getCursorBufferPosition()).toEqual([2, 2])
+
+          describe "when there is no selection", ->
+            it "pastes the line above the cursor and retains the cursor's column", ->
+              editor.pasteText()
+              expect(editor.lineTextForBufferRow(2)).toBe("    if (items.length <= 1) return items;")
+              expect(editor.lineTextForBufferRow(3)).toBe("    if (items.length <= 1) return items;")
+              expect(editor.getCursorBufferPosition()).toEqual([3, 13])
+
     describe ".indentSelectedRows()", ->
       describe "when nothing is selected", ->
         describe "when softTabs is enabled", ->

src/selection.coffee

@@ -546,8 +546,8 @@ class Selection extends Model
   # Public: Copies the selection to the clipboard and then deletes it.
   #
   # * `maintainClipboard` {Boolean} (default: false) See {::copy}
-  cut: (maintainClipboard=false) ->
-    @copy(maintainClipboard)
+  cut: (maintainClipboard=false, fullLine=false) ->
+    @copy(maintainClipboard, fullLine)
     @delete()
 
   # Public: Copies the current selection to the clipboard.
@@ -556,7 +556,7 @@ class Selection extends Model
   #   is created to store each content copied to the clipboard. The clipboard
   #   `text` still contains the concatenation of the clipboard with the
   #   current selection. (default: false)
-  copy: (maintainClipboard=false) ->
+  copy: (maintainClipboard=false, fullLine=false) ->
     return if @isEmpty()
     selectionText = @editor.buffer.getTextInRange(@getBufferRange())
     selectionIndentation = @editor.indentationForBufferRow(@getBufferRange().start.row)
@@ -569,10 +569,17 @@ class Selection extends Model
           text: clipboardText,
           indentBasis: metadata.indentBasis,
         }]
-      metadata.selections.push(text: selectionText, indentBasis: selectionIndentation)
+      metadata.selections.push({
+        text: selectionText,
+        indentBasis: selectionIndentation,
+        fullLine: fullLine
+      })
       atom.clipboard.write([clipboardText, selectionText].join("\n"), metadata)
     else
-      atom.clipboard.write(selectionText, {indentBasis: selectionIndentation})
+      atom.clipboard.write(selectionText, {
+        indentBasis: selectionIndentation,
+        fullLine: fullLine
+      })
 
   # Public: Creates a fold containing the current selection.
   fold: ->

src/text-editor.coffee

@@ -2472,18 +2472,21 @@ class TextEditor extends Model
       if selection.isEmpty()
         previousRange = selection.getBufferRange()
         selection.selectLine()
-        selection.copy(maintainClipboard)
+        selection.copy(maintainClipboard, true)
         selection.setBufferRange(previousRange)
       else
-        selection.copy(maintainClipboard)
+        selection.copy(maintainClipboard, false)
       maintainClipboard = true
 
   # Essential: For each selection, cut the selected text.
   cutSelectedText: ->
     maintainClipboard = false
     @mutateSelectedText (selection) ->
-      selection.selectLine() if selection.isEmpty()
-      selection.cut(maintainClipboard)
+      if selection.isEmpty()
+        selection.selectLine()
+        selection.cut(maintainClipboard, true)
+      else
+        selection.cut(maintainClipboard, false)
       maintainClipboard = true
 
   # Essential: For each selection, replace the selected text with the contents of
@@ -2501,9 +2504,10 @@ class TextEditor extends Model
 
     @mutateSelectedText (selection, index) =>
       if metadata.selections?.length is @getSelections().length
-        {text, indentBasis} = metadata.selections[index]
+        {text, indentBasis, fullLine} = metadata.selections[index]
       else
-        [text, indentBasis] = [clipboardText, metadata.indentBasis]
+        {indentBasis, fullLine} = metadata
+        text = clipboardText
 
       delete options.indentBasis
       {cursor} = selection
@@ -2512,7 +2516,14 @@ class TextEditor extends Model
         if containsNewlines or !cursor.hasPrecedingCharactersOnLine()
           options.indentBasis ?= indentBasis
 
-      selection.insertText(text, options)
+      if fullLine and selection.isEmpty()
+        oldPosition = selection.getBufferRange().start
+        selection.setBufferRange([[oldPosition.row, 0], [oldPosition.row, 0]])
+        selection.insertText(text, options)
+        newPosition = oldPosition.translate([1, 0])
+        selection.setBufferRange([newPosition, newPosition])
+      else
+        selection.insertText(text, options)
 
   # Public: For each selection, if the selection is empty, cut all characters
   # of the containing line following the cursor. Otherwise cut the selected