#! /usr/bin/env python
"""\
py.svnwcrevert [options] WCPATH

Running this script and then 'svn up' puts the working copy WCPATH in a state
as clean as a fresh check-out.

WARNING: you'll loose all local changes, obviously!

This script deletes all files that have been modified
or that svn doesn't explicitly know about, including svn:ignored files
(like .pyc files, hint hint).

The goal of this script is to leave the working copy with some files and
directories possibly missing, but - most importantly - in a state where
the following 'svn up' won't just crash.
"""

import sys, py

def kill(p, root):
    print('<    %s' % (p.relto(root),))
    p.remove(rec=1)

def svnwcrevert(path, root=None, precious=[]):
    if root is None:
        root = path
    wcpath = py.path.svnwc(path)
    try:
        st = wcpath.status()
    except ValueError:   # typically, "bad char in wcpath"
        kill(path, root)
        return
    for p in path.listdir():
        if p.basename == '.svn' or p.basename in precious:
            continue
        wcp = py.path.svnwc(p)
        if wcp not in st.unchanged and wcp not in st.external:
            kill(p, root)
        elif p.check(dir=1):
            svnwcrevert(p, root)

# XXX add a functional test

parser = py.std.optparse.OptionParser(usage=__doc__)
parser.add_option("-p", "--precious",
                  action="append", dest="precious", default=[],
                  help="preserve files with this name")

def main():
    opts, args = parser.parse_args()
    if len(args) != 1:
        parser.print_help()
        sys.exit(2)
    svnwcrevert(py.path.local(args[0]), precious=opts.precious)