#!/usr/bin/python3
"""
=======================================================================
Version 1.1: search for "Feb2014" for version changes -- Unicode file
content, local file same name as that in remote site link, >1 ignores.
License: provide freely, but with no warranties of any kind.

Synopsis: use python's html and url parser libs to try to isolate
and move unused files in a (flat) web site directory.  Run me in
the directory of the site's root html file(s) (default=[index.html]).

This is heuristic: it assumes that referenced files are in this site 
if they exist here.  It also may incorrectly classify some files as 
unused if they are referenced only from files which cause Python's
html parser to fail -- you should inspect the run log and unused file
directory manually after a run, to see if parse failures occurred.
More lenient html parsers exist for Python, but many seem 2.X-only; 
other parse options might avoid failures too: re.findall() pattern 
matches for '(?s)href="/?originalUrl=https%3A%2F%2Flearning-python.com%2F%26quot%3B(.*%3F)%26quot%3B%26%23x27%3B%2520and%2520%26%23x27%3Bsrc%3D...%26%23x27%3B%3F%2520(see%2520Example%252019-9).See%2520PP4E%2520Chapters%252019%2B14%2520for%2520html%2520parsers%2C%2520Chapter%252013%2520for%2520url%2520parsing%3Bthis%2520sort%2520of%2520code%2520could%2520be%2520adapted%2520to%2520do%2520web%2520site%2520search%2520and%2520similar.TBD%3A%2520extend%2520me%2520to%2520delete%2520the%2520unused%2520files%2520from%2520remote%2520site%2520via%2520ftp%3Bnot%2520done%2520because%2520unused%2520files%2520require%2520verification%2520if%2520parse%2520failures.CAVEAT%3A%2520assumes%2520site%2520is%2520one%2520dir%2C%2520doesn%26%23x27%3Bt%2520handle%2520subdirs%2520(improve%2520me)%3B%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%26quot%3B%26quot%3B%26quot%3Bimport%2520os%2C%2520sys%2C%2520html.parser%2C%2520urllib.parsedef%2520findUnusedFiles(rootFiles%3D%5B%26%23x27%3Bindex.html%26%23x27%3B%5D%2C%2520%2520%2520%2520%2520%23%2520site%2520roots%2520to%2520scan%2520for%2520links%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520dirUnused%3D%26%23x27%3BUnused%26%23x27%3B%2C%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%23%2520where%2520to%2520move%2520unused%2520files%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520skipFiles%3D%5B%5D%2C%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%23%2520skip%2520these%2520even%2520if%2520reached%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520thisSite%3D%5B%5D)%3A%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%23%2520skip%2520links%2520to%2520other%2520servers%2520%2520%2520%2520%26quot%3B%26quot%3B%26quot%3B%2520%2520%2520%2520--------------------------------------------------------------------%2520%2520%2520%2520main%2520function%3A%2520find%2520files%2520referenced%2520by%2520rootFiles%2520and%2520by%2520any%2520html%2520%2520%2520%2520they%2520reach%2C%2520ignoring%2520any%2520filenames%2520in%2520skipFiles%2C%2520and%2520ignoring%2520files%2520%2520%2520%2520at%2520sites%2520other%2520than%2520thisSite%2C%2520and%2520move%2520unused%2520files%2520to%2520dirUnused%3B%2520%2520%2520%2520--------------------------------------------------------------------%2520%2520%2520%2520%26quot%3B%26quot%3B%26quot%3B%2520%2520%2520%2520usedfiles%2520%3D%2520set(rootFiles)%2520%2520%2520%23%2520changed%2520in-place%2520%2520%2520%2520for%2520rootfile%2520in%2520rootFiles%3A%2520%2520%2520%2520%2520%2520%2520%2520parseFileRefs(rootfile%2C%2520usedfiles%2C%2520skipFiles%2C%2520thisSite%2C%2520indent%3D0)%2520%2520%2520%2520moveUnusedFiles(usedfiles%2C%2520dirUnused)%2520%2520%2520%2520return%2520usedfilesdef%2520moveUnusedFiles(usedFiles%2C%2520dirUnused%2C%2520trace%3Dprint)%3A%2520%2520%2520%2520%2520%26quot%3B%26quot%3B%26quot%3B%2520%2520%2520%2520--------------------------------------------------------------------%2520%2520%2520%2520after%2520finding%2520all%2520used%2520files%2C%2520move%2520unused%2520files%2520to%2520a%2520temp%2520directory%2520%2520%2520%2520--------------------------------------------------------------------%2520%2520%2520%2520%26quot%3B%26quot%3B%26quot%3B%2520%2520%2520%2520print(%26%23x27%3B-%26%23x27%3B%2520*%252080)%2520%2520%2520%2520if%2520not%2520os.path.exists(dirUnused)%3A%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%23%2520tbd%3A%2520clean%2520if%2520present%3F%2520%2520%2520%2520%2520%2520%2520%2520os.mkdir(dirUnused)%2520%2520%2520%2520for%2520filename%2520in%2520os.listdir(%26%23x27%3B.%26%23x27%3B)%3A%2520%2520%2520%2520%2520%2520%2520%2520if%2520filename%2520not%2520in%2520usedFiles%3A%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520if%2520not%2520os.path.isfile(filename)%3A%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520print(%26%23x27%3BNot%2520a%2520file%3A%26%23x27%3B%2C%2520filename)%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520else%3A%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520trace(%26%23x27%3BMoving...%26%23x27%3B%2C%2520filename)%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520%2520os.rename(filename%2C%2520os.path.join(dirUnused%2C%2520filename))def%2520parseFileRefs(htmlFile%2C%2520usedFiles%2C%2520skipFiles%2C%2520thisSite%2C%2520indent%2C%2520trace%3Dprint)%3A%2520%2520%2520%2520%26quot%3B%26quot%3B%26quot%3B%2520%2520%2520%2520--------------------------------------------------------------------%2520%2520%2520%2520find%2520files%2520referenced%2520in%2520root%2520named%2520htmlFile%2C%2520recur%2520for%2520html%2520files%3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