bpo-1529353: IDLE: squeeze large output in the shell (GH-7626)

(cherry picked from commit 604e7b9)

Co-authored-by: Tal Einat <taleinat+github@gmail.com>

Lib/idlelib/config-main.def

@@ -66,6 +66,9 @@ font-size= 10
 font-bold= 0
 encoding= none
 
+[PyShell]
+auto-squeeze-min-lines= 50
+
 [Indent]
 use-spaces= 1
 num-spaces= 4

Lib/idlelib/configdialog.py

@@ -30,10 +30,12 @@
 from idlelib.codecontext import CodeContext
 from idlelib.parenmatch import ParenMatch
 from idlelib.paragraph import FormatParagraph
+from idlelib.squeezer import Squeezer
 
 changes = ConfigChanges()
 # Reload changed options in the following classes.
-reloadables = (AutoComplete, CodeContext, ParenMatch, FormatParagraph)
+reloadables = (AutoComplete, CodeContext, ParenMatch, FormatParagraph,
+               Squeezer)
 
 
 class ConfigDialog(Toplevel):
@@ -1748,9 +1750,9 @@ def delete_custom_keys(self):
             self.customlist.SetMenu(item_list, item_list[0])
         # Revert to default key set.
         self.keyset_source.set(idleConf.defaultCfg['main']
-                                .Get('Keys', 'default'))
+                               .Get('Keys', 'default'))
         self.builtin_name.set(idleConf.defaultCfg['main'].Get('Keys', 'name')
-                             or idleConf.default_keys())
+                              or idleConf.default_keys())
         # User can't back out of these changes, they must be applied now.
         changes.save_all()
         self.cd.save_all_changed_extensions()
@@ -1817,6 +1819,10 @@ def create_page_general(self):
                 frame_context: Frame
                     context_title: Label
                     (*)context_int: Entry - context_lines
+            frame_shell: LabelFrame
+                frame_auto_squeeze_min_lines: Frame
+                    auto_squeeze_min_lines_title: Label
+                    (*)auto_squeeze_min_lines_int: Entry - auto_squeeze_min_lines
             frame_help: LabelFrame
                 frame_helplist: Frame
                     frame_helplist_buttons: Frame
@@ -1842,6 +1848,9 @@ def create_page_general(self):
         self.paren_bell = tracers.add(
                 BooleanVar(self), ('extensions', 'ParenMatch', 'bell'))
 
+        self.auto_squeeze_min_lines = tracers.add(
+                StringVar(self), ('main', 'PyShell', 'auto-squeeze-min-lines'))
+
         self.autosave = tracers.add(
                 IntVar(self), ('main', 'General', 'autosave'))
         self.format_width = tracers.add(
@@ -1855,8 +1864,10 @@ def create_page_general(self):
                                   text=' Window Preferences')
         frame_editor = LabelFrame(self, borderwidth=2, relief=GROOVE,
                                   text=' Editor Preferences')
+        frame_shell = LabelFrame(self, borderwidth=2, relief=GROOVE,
+                                 text=' Shell Preferences')
         frame_help = LabelFrame(self, borderwidth=2, relief=GROOVE,
-                               text=' Additional Help Sources ')
+                                text=' Additional Help Sources ')
         # Frame_window.
         frame_run = Frame(frame_window, borderwidth=0)
         startup_title = Label(frame_run, text='At Startup')
@@ -1918,6 +1929,13 @@ def create_page_general(self):
         self.context_int = Entry(
                 frame_context, textvariable=self.context_lines, width=3)
 
+        # Frame_shell.
+        frame_auto_squeeze_min_lines = Frame(frame_shell, borderwidth=0)
+        auto_squeeze_min_lines_title = Label(frame_auto_squeeze_min_lines,
+                                             text='Auto-Squeeze Min. Lines:')
+        self.auto_squeeze_min_lines_int = Entry(
+            frame_auto_squeeze_min_lines, width=4,
+            textvariable=self.auto_squeeze_min_lines)
 
         # frame_help.
         frame_helplist = Frame(frame_help)
@@ -1943,6 +1961,7 @@ def create_page_general(self):
         # Body.
         frame_window.pack(side=TOP, padx=5, pady=5, expand=TRUE, fill=BOTH)
         frame_editor.pack(side=TOP, padx=5, pady=5, expand=TRUE, fill=BOTH)
+        frame_shell.pack(side=TOP, padx=5, pady=5, expand=TRUE, fill=BOTH)
         frame_help.pack(side=TOP, padx=5, pady=5, expand=TRUE, fill=BOTH)
         # frame_run.
         frame_run.pack(side=TOP, padx=5, pady=0, fill=X)
@@ -1983,6 +2002,11 @@ def create_page_general(self):
         context_title.pack(side=LEFT, anchor=W, padx=5, pady=5)
         self.context_int.pack(side=TOP, padx=5, pady=5)
 
+        # frame_auto_squeeze_min_lines
+        frame_auto_squeeze_min_lines.pack(side=TOP, padx=5, pady=0, fill=X)
+        auto_squeeze_min_lines_title.pack(side=LEFT, anchor=W, padx=5, pady=5)
+        self.auto_squeeze_min_lines_int.pack(side=TOP, padx=5, pady=5)
+
         # frame_help.
         frame_helplist_buttons.pack(side=RIGHT, padx=5, pady=5, fill=Y)
         frame_helplist.pack(side=TOP, padx=5, pady=5, expand=TRUE, fill=BOTH)
@@ -2018,6 +2042,10 @@ def load_general_cfg(self):
         self.context_lines.set(idleConf.GetOption(
                 'extensions', 'CodeContext', 'maxlines', type='int'))
 
+        # Set variables for shell windows.
+        self.auto_squeeze_min_lines.set(idleConf.GetOption(
+                'main', 'PyShell', 'auto-squeeze-min-lines', type='int'))
+
         # Set additional help sources.
         self.user_helplist = idleConf.GetAllExtraHelpSourcesList()
         self.helplist.delete(0, 'end')
@@ -2211,6 +2239,9 @@ def detach(self):
 
 CodeContext: Maxlines is the maximum number of code context lines to
 display when Code Context is turned on for an editor window.
+
+Shell Preferences: Auto-Squeeze Min. Lines is the minimum number of lines
+of output to automatically "squeeze".
 '''
 }
 

Lib/idlelib/editor.py

@@ -2,9 +2,7 @@
 import importlib.util
 import os
 import platform
-import re
 import string
-import sys
 import tokenize
 import traceback
 import webbrowser
@@ -50,7 +48,6 @@ class EditorWindow(object):
     from idlelib.undo import UndoDelegator
     from idlelib.iomenu import IOBinding, encoding
     from idlelib import mainmenu
-    from tkinter import Toplevel, EventType
     from idlelib.statusbar import MultiStatusBar
     from idlelib.autocomplete import AutoComplete
     from idlelib.autoexpand import AutoExpand
@@ -59,6 +56,7 @@ class EditorWindow(object):
     from idlelib.paragraph import FormatParagraph
     from idlelib.parenmatch import ParenMatch
     from idlelib.rstrip import Rstrip
+    from idlelib.squeezer import Squeezer
     from idlelib.zoomheight import ZoomHeight
 
     filesystemencoding = sys.getfilesystemencoding()  # for file names
@@ -319,6 +317,9 @@ def __init__(self, flist=None, filename=None, key=None, root=None):
         text.bind("<<zoom-height>>", self.ZoomHeight(self).zoom_height_event)
         text.bind("<<toggle-code-context>>",
                   self.CodeContext(self).toggle_code_context_event)
+        squeezer = self.Squeezer(self)
+        text.bind("<<squeeze-current-text>>",
+                  squeezer.squeeze_current_text_event)
 
     def _filename_to_unicode(self, filename):
         """Return filename as BMP unicode so diplayable in Tk."""

Lib/idlelib/idle_test/htest.py

@@ -163,7 +163,7 @@ def _wrapper(parent):  # htest #
     'msg': "Click the 'Show GrepDialog' button.\n"
            "Test the various 'Find-in-files' functions.\n"
            "The results should be displayed in a new '*Output*' window.\n"
-           "'Right-click'->'Goto file/line' anywhere in the search results "
+           "'Right-click'->'Go to file/line' anywhere in the search results "
            "should open that file \nin a new EditorWindow."
     }
 

Lib/idlelib/idle_test/test_config.py

@@ -356,11 +356,11 @@ def test_get_section_list(self):
 
         self.assertCountEqual(
             conf.GetSectionList('default', 'main'),
-            ['General', 'EditorWindow', 'Indent', 'Theme',
+            ['General', 'EditorWindow', 'PyShell', 'Indent', 'Theme',
              'Keys', 'History', 'HelpFiles'])
         self.assertCountEqual(
             conf.GetSectionList('user', 'main'),
-            ['General', 'EditorWindow', 'Indent', 'Theme',
+            ['General', 'EditorWindow', 'PyShell', 'Indent', 'Theme',
              'Keys', 'History', 'HelpFiles'])
 
         with self.assertRaises(config.InvalidConfigSet):
@@ -452,7 +452,7 @@ def test_remove_key_bind_names(self):
 
         self.assertCountEqual(
             conf.RemoveKeyBindNames(conf.GetSectionList('default', 'extensions')),
-            ['AutoComplete', 'CodeContext', 'FormatParagraph', 'ParenMatch','ZzDummy'])
+            ['AutoComplete', 'CodeContext', 'FormatParagraph', 'ParenMatch', 'ZzDummy'])
 
     def test_get_extn_name_for_event(self):
         userextn.read_string('''