python · mlouielu · Jun 14, 2017
diff --git a/Lib/idlelib/editor.py b/Lib/idlelib/editor.py
@@ -27,6 +27,7 @@
 from idlelib import replace
 from idlelib import search
 from idlelib import windows
+from idlelib import sidebar
 
 # The default tab setting for a Text widget, in average-width characters.
 TK_TABWIDTH_DEFAULT = 8
@@ -57,7 +58,7 @@ class EditorWindow(object):
     filesystemencoding = sys.getfilesystemencoding()  # for file names
     help_url = None
 
-    def __init__(self, flist=None, filename=None, key=None, root=None):
+    def __init__(self, flist=None, filename=None, key=None, root=None, has_lineno=False):
         if EditorWindow.help_url is None:
             dochome =  os.path.join(sys.base_prefix, 'Doc', 'index.html')
             if sys.platform.count('linux'):
@@ -120,7 +121,8 @@ def __init__(self, flist=None, filename=None, key=None, root=None):
                 'height': idleConf.GetOption(
                         'main', 'EditorWindow', 'height', type='int'),
                 }
-        self.text = text = MultiCallCreator(Text)(text_frame, **text_options)
+
+        self.text = text = MultiCallCreator(sidebar.SidebarText)(text_frame, **text_options)
         self.top.focused_widget = self.text
 
         self.createmenubar()
@@ -190,6 +192,14 @@ def __init__(self, flist=None, filename=None, key=None, root=None):
         text['yscrollcommand'] = vbar.set
         text['font'] = idleConf.GetFont(self.root, 'main', 'EditorWindow')
         text_frame.pack(side=LEFT, fill=BOTH, expand=1)
+
+        if has_lineno:
+            self.sidebar = sidebar.LineNumberSidebar(text_frame, width=48)
+            self.sidebar.attach(text)
+            self.sidebar.pack(side=LEFT, fill=Y)
+            self.text.bind('<<Change>>', self.set_sidebar)
+            self.text.bind('<Configure>', self.set_sidebar)
+
         text.pack(side=TOP, fill=BOTH, expand=1)
         text.focus_set()
 
@@ -355,6 +365,9 @@ def set_line_and_column(self, event=None):
         self.status_bar.set_label('column', 'Col: %s' % column)
         self.status_bar.set_label('line', 'Ln: %s' % line)
 
+    def set_sidebar(self, event=None):
+        self.sidebar.redraw()
+
     menu_specs = [
         ("file", "_File"),
         ("edit", "_Edit"),

diff --git a/Lib/idlelib/pyshell.py b/Lib/idlelib/pyshell.py
@@ -112,7 +112,7 @@ class PyShellEditorWindow(EditorWindow):
 
     def __init__(self, *args):
         self.breakpoints = []
-        EditorWindow.__init__(self, *args)
+        EditorWindow.__init__(self, has_lineno=True, *args)
         self.text.bind("<<set-breakpoint-here>>", self.set_breakpoint_here)
         self.text.bind("<<clear-breakpoint-here>>", self.clear_breakpoint_here)
         self.text.bind("<<open-python-shell>>", self.flist.open_shell)

diff --git a/Lib/idlelib/sidebar.py b/Lib/idlelib/sidebar.py
@@ -0,0 +1,71 @@
+'''Provide line number sidebar to editor
+
+Inspire by Bryan Oakley, on stackflow: https://stackoverflow.com/a/16375233
+'''
+
+import tkinter as tk
+
+
+class LineNumberSidebar(tk.Canvas):
+    def __init__(self, *args, **kwargs):
+        tk.Canvas.__init__(self, highlightthickness=0, background='grey93', *args, **kwargs)
+
+    def attach(self, text_widget):
+        self.text = text_widget
+
+    def redraw(self, *args):
+        '''redraw line numbers'''
+        self.delete('all')
+
+        # Get cursor lineno
+        curline, column = self.text.index(tk.INSERT).split('.')
+
+        # Redraw from top
+        i = self.text.index('@0,0')
+        while True:
+            dline = self.text.dlineinfo(i)
+            if dline is None:
+                break
+
+            lineno = i.split('.')[0]
+            text = self.create_text(45, dline[1], anchor='ne', text=lineno)
+
+            # Highlight cursor line number with white rectangle
+            if lineno == curline:
+                n, e, s, w = self.bbox(text)
+                r = self.create_rectangle((1, e, s + 3, w), fill='white', outline='white')
+                self.tag_lower(r, text)
+
+            # Update index
+            i = self.text.index('%s + 1line' % i)
+
+
+class SidebarText(tk.Text):
+    def __init__(self, *args, **kwargs):
+        tk.Text.__init__(self, *args, **kwargs)
+
+        self.tk.eval('''
+            proc widget_proxy {widget widget_command args} {
+
+                # call the real tk widget command with the real args
+                set result [uplevel [linsert $args 0 $widget_command]]
+
+                # generate the event for certain types of commands
+                if {([lindex $args 0] in {insert replace delete}) ||
+                    ([lrange $args 0 2] == {mark set insert}) ||
+                    ([lrange $args 0 1] == {xview moveto}) ||
+                    ([lrange $args 0 1] == {xview scroll}) ||
+                    ([lrange $args 0 1] == {yview moveto}) ||
+                    ([lrange $args 0 1] == {yview scroll})} {
+
+                    event generate  $widget <<Change>> -when tail
+                }
+
+                # return the result from the real widget command
+                return $result
+            }
+            ''')
+        self.tk.eval('''
+            rename {widget} _{widget}
+            interp alias {{}} ::{widget} {{}} widget_proxy {widget} _{widget}
+        '''.format(widget=str(self)))