#!/usr/bin/env python
# Copyright (c) 2009 Tim Freeman
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# (This is the standard MIT License, copied from
# http://www.opensource.org/licenses/mit-license.php on 24 Apr 2007.)
#desc The top level of the test harness.  Useful if you want to
#desc run many tests or run with coverage analysis.
import sys
import os
import os.path
import glob
import time

def safe_system(cmd):
    status = os.system(cmd)
    if status != 0:
        raise Exception("Failed to run %r" % cmd,)

nocover = ["regress.py", "coverage.py", "test_util.py", "index_html.py"]

def do_coverage(testfiles, to_cover, cover):
    start = time.time()
    coverage_file = ".coverage"
    if os.path.exists(coverage_file):
        os.remove(coverage_file)
    failures = 0
    for testfile in testfiles:
        sys.stdout.write("Running %r..." % (testfile,))
        sys.stdout.flush()
        command = "python "
        if cover:
            command += "coverage.py -x "
        status = os.system(command + testfile)
        if status == 0:
            print("Done.")
        else:
            failures += 1
    if failures:
        raise Exception("Some tests failed to run.")
    to_cover = " ".join(to_cover)
    if cover:
        safe_system("python coverage.py -a " + to_cover)
        safe_system("python coverage.py -r " + to_cover)
    print "%6.1f seconds elapsed" % (time.time() - start)

def usage():
    sys.stderr.write("""Usage: regress.py [-nocover] [files] [-skip files]
Run unit tests and optionally does coverage analysis for the given files.
This assumes that the test file for foo.py is foo_test.py.
Specify the foo.py's as the argument.  Any files matching *_test.py
will be ignored, and any files appearing after "-skip" will be ignored.
You can leave out the .py extension.
""")
    sys.exit(1)
    
def trim_ext(ext, f):
    if f.endswith(ext):
        return f[:len(f)-len(ext)]
    else:
        return f

def trim_file(f):
    f = trim_ext(".py", f)
    f = trim_ext("_test", f)
    return f

coverage = True

if len(sys.argv) >= 2 and sys.argv[1] == "-nocover":
    coverage = False
    sys.argv = [sys.argv[0]] + sys.argv[2:]
skip = "-skip"
if skip in sys.argv:
    where = sys.argv.index(skip)
    nocover += sys.argv[where + 1:]
    sys.argv = sys.argv[:where]
if len(sys.argv) == 1:
    testfiles = glob.glob("*_test.py")
    to_cover = [f for f in glob.glob("*.py")
                if f not in nocover + testfiles]
    do_coverage(testfiles, to_cover, coverage)
else:
    to_cover = [trim_file(f)+".py" for f in sys.argv[1:]
                if not trim_file(f).endswith("_test")
                and not trim_file(f)+".py" in nocover]
    testfiles = [trim_file(f)+"_test.py" for f in to_cover]
    for f in to_cover:
        if not os.path.exists(f):
            sys.stderr.write("Can't find a file named %r\n" % (f,))
            usage()
    do_coverage(testfiles, to_cover, coverage)