tree to be input, preset it to the platform filesystem or
text default, and skip files that fail to decode; in worst
cases, users may need to run grep N times if N encodings might
exist; else opens may raise exceptions, and opening in binary
mode might fail to match encoded text against search string;TBD: better to issue an error if any file fails to decode?
but utf-16 2-bytes/char format created in Notepad may decode
without error per utf-8, and search strings won't be found;
TBD: could allow input of multiple encoding names, split on
comma, try each one for every file, without open loadEncode?
"""
from PP4E.Gui.ShellGui.formrows import makeFormRow# nonmodal dialog: get dirnname, filenamepatt, grepkey
popup = Toplevel()
popup.title('PyEdit - grep')
var1 = makeFormRow(popup, label='Directory root', width=18, browse=False)
var2 = makeFormRow(popup, label='Filename pattern', width=18, browse=False)
var3 = makeFormRow(popup, label='Search string', width=18, browse=False)
var4 = makeFormRow(popup, label='Content encoding', width=18, browse=False)
var1.set('.') # current dir
var2.set('*.py') # initial values
var4.set(sys.getdefaultencoding()) # for file content, not filenames
cb = lambda: self.onDoGrep(var1.get(), var2.get(), var3.get(), var4.get())
Button(popup, text='Go',command=cb).pack()def onDoGrep(self, dirname, filenamepatt, grepkey, encoding):
"""
on Go in grep dialog: populate scrolled list with matches
tbd: should producer thread be daemon so it dies with app?
"""
import threading, queue# make non-modal un-closeable dialog
mypopup = Tk()
mypopup.title('PyEdit - grepping')
status = Label(mypopup, text='Grep thread searching for: %r...' % grepkey)
status.pack(padx=20, pady=20)
mypopup.protocol('WM_DELETE_WINDOW', lambda: None) # ignore X close# start producer thread, consumer loop
myqueue = queue.Queue()
threadargs = (filenamepatt, dirname, grepkey, encoding, myqueue)
threading.Thread(target=self.grepThreadProducer, args=threadargs).start()
self.grepThreadConsumer(grepkey, encoding, myqueue, mypopup)def grepThreadProducer(self, filenamepatt, dirname, grepkey, encoding, myqueue):
"""
in a non-GUI parallel thread: queue find.find results list;
could also queue matches as found, but need to keep window;
file content and file names may both fail to decode here;TBD: could pass encoded bytes to find() to avoid filename
decoding excs in os.walk/listdir, but which encoding to use:708 | Chapter 11: Complete GUI ProgramsDo
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