Checking in IDLE 0.2.

Much has changed -- too much, in fact, to write down.
The big news is that there's a standard way to write IDLE extensions;
see extend.txt.  Some sample extensions have been provided, and
some existing code has been converted to extensions.  Probably the
biggest new user feature is a new search dialog with more options,
search and replace, and even search in files (grep).

This is exactly as downloaded from my laptop after returning
from the holidays -- it hasn't even been tested on Unix yet.

Tools/idle/SearchDialogBase.py

@@ -0,0 +1,129 @@
+import string
+from Tkinter import *
+
+class SearchDialogBase:
+
+    title = "Search Dialog"
+    icon = "Search"
+    needwrapbutton = 1
+
+    def __init__(self, root, engine):
+        self.root = root
+        self.engine = engine
+        self.top = None
+
+    def open(self, text):
+        self.text = text
+        if not self.top:
+            self.create_widgets()
+        else:
+            self.top.deiconify()
+            self.top.tkraise()
+        self.ent.focus_set()
+        self.ent.selection_range(0, "end")
+        self.ent.icursor(0)
+        self.top.grab_set()
+
+    def close(self, event=None):
+        if self.top:
+            self.top.grab_release()
+            self.top.withdraw()
+
+    def create_widgets(self):
+        top = Toplevel(self.root)
+        top.bind("<Return>", self.default_command)
+        top.bind("<Escape>", self.close)
+        top.protocol("WM_DELETE_WINDOW", self.close)
+        top.wm_title(self.title)
+        top.wm_iconname(self.icon)
+        self.top = top
+
+        self.row = 0
+        self.top.grid_columnconfigure(0, weight=0)
+        self.top.grid_columnconfigure(1, weight=100)
+
+        self.create_entries()
+        self.create_option_buttons()
+        self.create_other_buttons()
+        return self.create_command_buttons()
+
+    def make_entry(self, label, var):
+        l = Label(self.top, text=label)
+        l.grid(row=self.row, col=0, sticky="w")
+        e = Entry(self.top, textvariable=var, exportselection=0)
+        e.grid(row=self.row, col=1, sticky="we")
+        self.row = self.row + 1
+        return e
+
+    def make_frame(self):
+        f = Frame(self.top)
+        f.grid(row=self.row, col=0, columnspan=2, sticky="we")
+        self.row = self.row + 1
+        return f
+
+    def make_button(self, label, command, isdef=0, side="left"):
+        b = Button(self.buttonframe,
+                   text=label, command=command,
+                   default=isdef and "active" or "normal")
+        b.pack(side=side)
+        return b
+
+    def create_entries(self):
+        self.ent = self.make_entry("Find:", self.engine.patvar)
+
+    def create_option_buttons(self):
+        f = self.make_frame()
+
+        btn = Checkbutton(f, anchor="w",
+                variable=self.engine.revar,
+                text="Regular expression")
+        btn.pack(side="left", fill="both")
+        if self.engine.isre():
+            btn.select()
+
+        btn = Checkbutton(f, anchor="w",
+                variable=self.engine.casevar,
+                text="Match case")
+        btn.pack(side="left", fill="both")
+        if self.engine.iscase():
+            btn.select()
+
+        btn = Checkbutton(f, anchor="w",
+                variable=self.engine.wordvar,
+                text="Whole word")
+        btn.pack(side="left", fill="both")
+        if self.engine.isword():
+            btn.select()
+
+        if self.needwrapbutton:
+            btn = Checkbutton(f, anchor="w",
+                    variable=self.engine.wrapvar,
+                    text="Wrap around")
+            btn.pack(side="left", fill="both")
+            if self.engine.iswrap():
+                btn.select()
+
+    def create_other_buttons(self):
+        f = self.make_frame()
+
+        lbl = Label(f, text="Direction: ")
+        lbl.pack(side="left")
+
+        btn = Radiobutton(f, anchor="w",
+                variable=self.engine.backvar, value=1,
+                text="Up")
+        btn.pack(side="left", fill="both")
+        if self.engine.isback():
+            btn.select()
+
+        btn = Radiobutton(f, anchor="w",
+                variable=self.engine.backvar, value=0,
+                text="Down")
+        btn.pack(side="left", fill="both")
+        if not self.engine.isback():
+            btn.select()
+
+    def create_command_buttons(self):
+        f = self.buttonframe = self.make_frame()
+        b = self.make_button("close", self.close, side="right")
+        b.lower()