from tkinter import *

from idlelib import SearchEngine
from idlelib.SearchDialogBase import SearchDialogBase

def _setup(text):
root = text._root()
engine = SearchEngine.get(root)
if not hasattr(engine, "_searchdialog"):
engine._searchdialog = SearchDialog(root, engine)
return engine._searchdialog

def find(text):
pat = text.get("sel.first", "sel.last")
return _setup(text).open(text,pat)

def find_again(text):
return _setup(text).find_again(text)

def find_selection(text):
return _setup(text).find_selection(text)

class SearchDialog(SearchDialogBase):

def create_widgets(self):
f = SearchDialogBase.create_widgets(self)
self.make_button("Find Next", self.default_command, 1)

def default_command(self, event=None):
if not self.engine.getprog():
return
self.find_again(self.text)

def find_again(self, text):
if not self.engine.getpat():
self.open(text)
return False
if not self.engine.getprog():
return False
res = self.engine.search_text(text)
if res:
line, m = res
i, j = m.span()
first = "%d.%d" % (line, i)
last = "%d.%d" % (line, j)
try:
selfirst = text.index("sel.first")
sellast = text.index("sel.last")
if selfirst == first and sellast == last:
text.bell()
return False
except TclError:
pass
text.tag_remove("sel", "1.0", "end")
text.tag_add("sel", first, last)
text.mark_set("insert", self.engine.isback() and first or last)
text.see("insert")
return True
else:
text.bell()
return False

def find_selection(self, text):
pat = text.get("sel.first", "sel.last")
if pat:
self.engine.setcookedpat(pat)
return self.find_again(text)