<Enter> when cursor is on a previous command retrieves that command. Instead

of replacing the input line, the previous command is now appended to the
input line. Indentation is preserved, and undo is enabled.
Patch 1196917  Jeff Shute

Modified Files:
	NEWS.txt PyShell.py

Lib/idlelib/PyShell.py

@@ -1074,7 +1074,7 @@ class PyShell(OutputWindow):
             sel = self.text.get("sel.first", "sel.last")
             if sel:
                 if self.text.compare("sel.last", "<=", "iomark"):
-                    self.recall(sel)
+                    self.recall(sel, event)
                     return "break"
         except:
             pass
@@ -1085,18 +1085,18 @@ class PyShell(OutputWindow):
             # Check if there's a relevant stdin range -- if so, use it
             prev = self.text.tag_prevrange("stdin", "insert")
             if prev and self.text.compare("insert", "<", prev[1]):
-                self.recall(self.text.get(prev[0], prev[1]))
+                self.recall(self.text.get(prev[0], prev[1]), event)
                 return "break"
             next = self.text.tag_nextrange("stdin", "insert")
             if next and self.text.compare("insert lineend", ">=", next[0]):
-                self.recall(self.text.get(next[0], next[1]))
+                self.recall(self.text.get(next[0], next[1]), event)
                 return "break"
             # No stdin mark -- just get the current line, less any prompt
             line = self.text.get("insert linestart", "insert lineend")
             last_line_of_prompt = sys.ps1.split('\n')[-1]
             if line.startswith(last_line_of_prompt):
                 line = line[len(last_line_of_prompt):]
-            self.recall(line)
+            self.recall(line, event)
             return "break"
         # If we're between the beginning of the line and the iomark, i.e.
         # in the prompt area, move to the end of the prompt
@@ -1127,9 +1127,29 @@ class PyShell(OutputWindow):
             self.runit()
         return "break"
 
-    def recall(self, s):
-        if self.history:
-            self.history.recall(s)
+    def recall(self, s, event):
+        self.text.undo_block_start()
+        try:
+            self.text.tag_remove("sel", "1.0", "end")
+            self.text.mark_set("insert", "end-1c")
+            s = s.strip()
+            lines = s.split('\n')
+            if lines:
+                prefix = self.text.get("insert linestart","insert").rstrip()
+                if prefix and prefix[-1]==':':
+                    self.newline_and_indent_event(event)
+
+                self.text.insert("insert",lines[0].strip())
+                if len(lines) > 1:
+                    self.newline_and_indent_event(event)
+                    for line in lines[1:]:
+                        self.text.insert("insert", line.strip())
+                        self.newline_and_indent_event(event)
+            else:
+                self.text.insert("insert", s)
+        finally:
+            self.text.see("insert")
+            self.text.undo_block_stop()
 
     def runit(self):
         line = self.text.get("iomark", "end-1c")