Python difflib 模块，HtmlDiff() 实例源码

def diff( self, id1, id2, r1=None, r2=None ):

        cdfl = CoreData.FileList()
        cdfl.__createFileList__()
        fn1 = cdf.__filterByFlightNumberAndRevision__( id1, r1 )
        fn2 = cdf.__filterByFlightNumberAndRevision__( id2, r2 )

        fc1 = __getFlightConstants__( fn1 )
        fc2 = __getFlightConstants__( fn2 )

        differ = difflib.HtmlDiff( tabsize=4, wrapcolumn=40 )
        html = differ.make_file( fc1, fc2, context=False )

        outfile = open( '/home/axel/tmp/difftest.html', 'w' )
        outfile.write(html)
        outfile.close()

def getDiff(self, cr, uid, v1, v2, context=None):
        history_pool = self.pool.get('blog.post.history')
        text1 = history_pool.read(cr, uid, [v1], ['content'])[0]['content']
        text2 = history_pool.read(cr, uid, [v2], ['content'])[0]['content']
        line1 = line2 = ''
        if text1:
            line1 = text1.splitlines(1)
        if text2:
            line2 = text2.splitlines(1)
        if (not line1 and not line2) or (line1 == line2):
            raise osv.except_osv(_('Warning!'), _('There are no changes in revisions.'))
        diff = difflib.HtmlDiff()
        return diff.make_table(line1, line2, "Revision-%s" % (v1), "Revision-%s" % (v2), context=True)

def lines_from_sourcepairs(pairs, numlines=2, enc='utf-8'):
        # type: (List[BytesPair], int, str) -> Tuple[List[str], List[str]]
        def safeunistr(s):
            # type: (bytes) -> str
            # The bytes 0 and 1 that appear in the intermediate result of
            # difflib.HtmlDiff.make_table are replaced by opening and closing span tags.
            # If the input to make_table already contains 0 and 1 bytes we get mismatched
            # span tags.
            # We use '\x02' as escape character and encode '\x00', '\x01', '\x02' as
            # '\x02' followed by the digit 0, 1, 2 respectively.
            def escape_zeroonetwo(m):
                return b'\x02' + int2byte(ord('0') + ord(m.group(0)))

            s = re.sub(b'[\x00-\x02]', escape_zeroonetwo, s)
            return surrdecode(s, enc=enc)

        a = [a for a, _ in pairs]
        b = [b for _, b in pairs]
        a = concat_sources(a, numlines=numlines).splitlines(True)
        b = concat_sources(b, numlines=numlines).splitlines(True)
        atext = list(map(safeunistr, a))
        btext = list(map(safeunistr, b))
        return atext, btext


# yapf: disable
# ----------------------------------------------------------------------
# http://stackoverflow.com/questions/1707890/
#           fast-way-to-filter-illegal-xml-unicode-chars-in-python

def email_changes(zone, prev_addrs, curr_addrs, subject, server, fromaddr, toaddr, test=False):
    bindformat = format_records_for_email(curr_addrs)
    prev_addrs = ' '.join(prev_addrs)
    curr_addrs = ' '.join(curr_addrs)
    prev = sorted([s for s in prev_addrs.split() if 'ip' in s])
    curr = sorted([s for s in curr_addrs.split() if 'ip' in s])

    diff = HtmlDiff()
    table = diff.make_table(
        fromlines=prev,
        tolines=curr,
        fromdesc='Old records',
        todesc='New records'
    )

    header = '<h1>Diff</h1>'
    html = _email_style + bindformat + header + table
    html = MIMEText(html, 'html')
    msg_template = MIMEMultipart('alternative')
    msg_template['Subject'] = subject.format(zone=zone)
    email = msg_template
    email.attach(html)

    try:
        mailserver = smtplib.SMTP()
        mailserver.connect(server)
        mailserver.sendmail(fromaddr, toaddr, email.as_string())
    except Exception as err:
        print('Email failed: ' + str(err))
        with open('result.html', 'w+') as mailfile:
            mailfile.write(html.as_string())
    if test:
        return bindformat

def test_main():
    difflib.HtmlDiff._default_prefix = 0
    Doctests = doctest.DocTestSuite(difflib)
    run_unittest(
        TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
        TestOutputFormat, Doctests)

def test_main():
    difflib.HtmlDiff._default_prefix = 0
    Doctests = doctest.DocTestSuite(difflib)
    run_unittest(
        TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
        TestOutputFormat, Doctests)

def main():

    usage = "usage: %prog [options] fromfile tofile"
    parser = optparse.OptionParser(usage)
    parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)')
    parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff')
    parser.add_option("-m", action="store_true", default=False, help='Produce HTML side by side diff (can use -c and -l in conjunction)')
    parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff')
    parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)')
    (options, args) = parser.parse_args()

    if len(args) == 0:
        parser.print_help()
        sys.exit(1)
    if len(args) != 2:
        parser.error("need to specify both a fromfile and tofile")

    n = options.lines
    fromfile, tofile = args

    fromdate = time.ctime(os.stat(fromfile).st_mtime)
    todate = time.ctime(os.stat(tofile).st_mtime)
    fromlines = open(fromfile, 'U').readlines()
    tolines = open(tofile, 'U').readlines()

    if options.u:
        diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
    elif options.n:
        diff = difflib.ndiff(fromlines, tolines)
    elif options.m:
        diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n)
    else:
        diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)

    sys.stdout.writelines(diff)

def test_main():
    difflib.HtmlDiff._default_prefix = 0
    Doctests = doctest.DocTestSuite(difflib)
    run_unittest(
        TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
        TestOutputFormat, Doctests)

def main():

    usage = "usage: %prog [options] fromfile tofile"
    parser = optparse.OptionParser(usage)
    parser.add_option("-c", action="store_true", default=False, help='Produce a context format diff (default)')
    parser.add_option("-u", action="store_true", default=False, help='Produce a unified format diff')
    parser.add_option("-m", action="store_true", default=False, help='Produce HTML side by side diff (can use -c and -l in conjunction)')
    parser.add_option("-n", action="store_true", default=False, help='Produce a ndiff format diff')
    parser.add_option("-l", "--lines", type="int", default=3, help='Set number of context lines (default 3)')
    (options, args) = parser.parse_args()

    if len(args) == 0:
        parser.print_help()
        sys.exit(1)
    if len(args) != 2:
        parser.error("need to specify both a fromfile and tofile")

    n = options.lines
    fromfile, tofile = args

    fromdate = time.ctime(os.stat(fromfile).st_mtime)
    todate = time.ctime(os.stat(tofile).st_mtime)
    fromlines = open(fromfile, 'U').readlines()
    tolines = open(tofile, 'U').readlines()

    if options.u:
        diff = difflib.unified_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)
    elif options.n:
        diff = difflib.ndiff(fromlines, tolines)
    elif options.m:
        diff = difflib.HtmlDiff().make_file(fromlines,tolines,fromfile,tofile,context=options.c,numlines=n)
    else:
        diff = difflib.context_diff(fromlines, tolines, fromfile, tofile, fromdate, todate, n=n)

    sys.stdout.writelines(diff)

def make_diff(old, new):
    """
    Render in HTML the diff between two texts
    """
    df = HtmlDiff()
    old_lines = old.splitlines(1)
    new_lines = new.splitlines(1)
    html = df.make_table(old_lines, new_lines, context=True)
    html = html.replace(' nowrap="nowrap"','')
    return html

def html_diff(old_as_text, new_as_text): # {{{1
    """ returns a utf8 string containing the code of a html table showing
    differences of the utf8 parameters """
    old_as_text = old_as_text.splitlines()
    new_as_text = new_as_text.splitlines()
    table = HtmlDiff( tabsize = 4 ).make_table( old_as_text, new_as_text )
    return table.replace( ' ', ' ' ).replace( ' nowrap="nowrap"', '' )

def test_main():
    difflib.HtmlDiff._default_prefix = 0
    Doctests = doctest.DocTestSuite(difflib)
    run_unittest(
        TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
        TestOutputFormat, Doctests)

def make_file(self, context=False, lines=3):
    return difflib.HtmlDiff().make_file(
        self.fromlines, self.tolines, self._fromfile, self._tofile,
        context=context, numlines=lines)

def test_main():
    difflib.HtmlDiff._default_prefix = 0
    Doctests = doctest.DocTestSuite(difflib)
    run_unittest(
        TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
        TestOutputFormat, Doctests)

def test_main():
    difflib.HtmlDiff._default_prefix = 0
    Doctests = doctest.DocTestSuite(difflib)
    run_unittest(
        TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
        TestOutputFormat, Doctests)

def test_main():
    difflib.HtmlDiff._default_prefix = 0
    Doctests = doctest.DocTestSuite(difflib)
    run_unittest(
        TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
        TestOutputFormat, Doctests)

def diff_working(repo,file,src=source.PATH):
    store=repo.object_store
    index=repo.open_index()

    tree=store[store[repo.head()].tree]
    parent_tree=store[store[store[repo.head()].parents[0]].tree]

    tree_ver=store[tree.lookup_path(store.peel_sha,file)[1]].data


    local_ver=open(os.path.join(repo.path,file)).read()
    h=HtmlDiff(wrapcolumn=70,tabsize=4)
    if src==source.PATH:
        f=h.make_file(tree_ver.splitlines(),local_ver.splitlines(), file, 'last commit:'+repo.head())
    elif src==source.INDEX:
        index_ver=store[index._byname[file].sha].data
        f=h.make_file(tree_ver.splitlines(),index_ver.splitlines(),file+' staged change', 'last commit'+repo.head())
    else:
        parent_tree_ver=store[parent_tree.lookup_path(store.peel_sha,file)[1]].data
        f=h.make_file(parent_tree_ver.splitlines(),tree_ver.splitlines(), file+' HEAD','HEAD^1')        
    return f

#f=diff_working(porcelain.open_repo('.'),'gitui.py')
#w=ui.WebView()
#w.load_html(f)
#w.present()

def test_main():
    difflib.HtmlDiff._default_prefix = 0
    Doctests = doctest.DocTestSuite(difflib)
    run_unittest(
        TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
        TestOutputFormat, Doctests)

def create_diff_report(file1, file2, file_name, from_desc, to_desc, is_64_bit):

    """ Create a report showing the differences between two files

        Arguments :
            file1 : path to a file to disassemble
            file2 : path to a file to disassemble
            report_name : The name to use for the report
            from_desc : A description of the 'from' element
            to_desc : A description of the 'to' element
    """

    # Disassemble each file and split into lines
    disassembled_1 = OPcacheDisassembler(is_64_bit).disassemble(file1).split("\n")
    disassembled_2 = OPcacheDisassembler(is_64_bit).disassemble(file2).split("\n")

    # Differ
    html_differ = difflib.HtmlDiff()

    # Generate the report and write into a file
    file_name = file_name.replace("/", "%2f") + '.html'
    hash_name = hashlib.sha1(file_name).hexdigest()
    with open(hunt_report + "/" + hash_name + ".html", "w") as f:
    content = html_differ.make_file(disassembled_1, disassembled_2, from_desc, to_desc)
        f.write(content)

    # Return the name of the report
    return (file_name, hash_name + ".html")

def test_html_diff(self):
        # Check SF patch 914575 for generating HTML differences
        f1a = ((patch914575_from1 + '123\n'*10)*3)
        t1a = (patch914575_to1 + '123\n'*10)*3
        f1b = '456\n'*10 + f1a
        t1b = '456\n'*10 + t1a
        f1a = f1a.splitlines()
        t1a = t1a.splitlines()
        f1b = f1b.splitlines()
        t1b = t1b.splitlines()
        f2 = patch914575_from2.splitlines()
        t2 = patch914575_to2.splitlines()
        f3 = patch914575_from3
        t3 = patch914575_to3
        i = difflib.HtmlDiff()
        j = difflib.HtmlDiff(tabsize=2)
        k = difflib.HtmlDiff(wrapcolumn=14)

        full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
        tables = '\n'.join(
            [
             '<h2>Context (first diff within numlines=5(default))</h2>',
             i.make_table(f1a,t1a,'from','to',context=True),
             '<h2>Context (first diff after numlines=5(default))</h2>',
             i.make_table(f1b,t1b,'from','to',context=True),
             '<h2>Context (numlines=6)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
             '<h2>Context (numlines=0)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
             '<h2>Same Context</h2>',
             i.make_table(f1a,f1a,'from','to',context=True),
             '<h2>Same Full</h2>',
             i.make_table(f1a,f1a,'from','to',context=False),
             '<h2>Empty Context</h2>',
             i.make_table([],[],'from','to',context=True),
             '<h2>Empty Full</h2>',
             i.make_table([],[],'from','to',context=False),
             '<h2>tabsize=2</h2>',
             j.make_table(f2,t2),
             '<h2>tabsize=default</h2>',
             i.make_table(f2,t2),
             '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
             k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
             '<h2>wrapcolumn=14,splitlines()</h2>',
             k.make_table(f3.splitlines(),t3.splitlines()),
             '<h2>wrapcolumn=14,splitlines(True)</h2>',
             k.make_table(f3.splitlines(True),t3.splitlines(True)),
             ])
        actual = full.replace('</body>','\n%s\n</body>' % tables)

        # temporarily uncomment next two lines to baseline this test
        #with open('test_difflib_expect.html','w') as fp:
        #    fp.write(actual)

        with open(findfile('test_difflib_expect.html')) as fp:
            self.assertEqual(actual, fp.read())

def test_html_diff(self):
        # Check SF patch 914575 for generating HTML differences
        f1a = ((patch914575_from1 + '123\n'*10)*3)
        t1a = (patch914575_to1 + '123\n'*10)*3
        f1b = '456\n'*10 + f1a
        t1b = '456\n'*10 + t1a
        f1a = f1a.splitlines()
        t1a = t1a.splitlines()
        f1b = f1b.splitlines()
        t1b = t1b.splitlines()
        f2 = patch914575_from2.splitlines()
        t2 = patch914575_to2.splitlines()
        f3 = patch914575_from3
        t3 = patch914575_to3
        i = difflib.HtmlDiff()
        j = difflib.HtmlDiff(tabsize=2)
        k = difflib.HtmlDiff(wrapcolumn=14)

        full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
        tables = '\n'.join(
            [
             '<h2>Context (first diff within numlines=5(default))</h2>',
             i.make_table(f1a,t1a,'from','to',context=True),
             '<h2>Context (first diff after numlines=5(default))</h2>',
             i.make_table(f1b,t1b,'from','to',context=True),
             '<h2>Context (numlines=6)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
             '<h2>Context (numlines=0)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
             '<h2>Same Context</h2>',
             i.make_table(f1a,f1a,'from','to',context=True),
             '<h2>Same Full</h2>',
             i.make_table(f1a,f1a,'from','to',context=False),
             '<h2>Empty Context</h2>',
             i.make_table([],[],'from','to',context=True),
             '<h2>Empty Full</h2>',
             i.make_table([],[],'from','to',context=False),
             '<h2>tabsize=2</h2>',
             j.make_table(f2,t2),
             '<h2>tabsize=default</h2>',
             i.make_table(f2,t2),
             '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
             k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
             '<h2>wrapcolumn=14,splitlines()</h2>',
             k.make_table(f3.splitlines(),t3.splitlines()),
             '<h2>wrapcolumn=14,splitlines(True)</h2>',
             k.make_table(f3.splitlines(True),t3.splitlines(True)),
             ])
        actual = full.replace('</body>','\n%s\n</body>' % tables)

        # temporarily uncomment next two lines to baseline this test
        #with open('test_difflib_expect.html','w') as fp:
        #    fp.write(actual)

        with open(findfile('test_difflib_expect.html')) as fp:
            self.assertEqual(actual, fp.read())

def test_html_diff(self):
        # Check SF patch 914575 for generating HTML differences
        f1a = ((patch914575_from1 + '123\n'*10)*3)
        t1a = (patch914575_to1 + '123\n'*10)*3
        f1b = '456\n'*10 + f1a
        t1b = '456\n'*10 + t1a
        f1a = f1a.splitlines()
        t1a = t1a.splitlines()
        f1b = f1b.splitlines()
        t1b = t1b.splitlines()
        f2 = patch914575_from2.splitlines()
        t2 = patch914575_to2.splitlines()
        f3 = patch914575_from3
        t3 = patch914575_to3
        i = difflib.HtmlDiff()
        j = difflib.HtmlDiff(tabsize=2)
        k = difflib.HtmlDiff(wrapcolumn=14)

        full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
        tables = '\n'.join(
            [
             '<h2>Context (first diff within numlines=5(default))</h2>',
             i.make_table(f1a,t1a,'from','to',context=True),
             '<h2>Context (first diff after numlines=5(default))</h2>',
             i.make_table(f1b,t1b,'from','to',context=True),
             '<h2>Context (numlines=6)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
             '<h2>Context (numlines=0)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
             '<h2>Same Context</h2>',
             i.make_table(f1a,f1a,'from','to',context=True),
             '<h2>Same Full</h2>',
             i.make_table(f1a,f1a,'from','to',context=False),
             '<h2>Empty Context</h2>',
             i.make_table([],[],'from','to',context=True),
             '<h2>Empty Full</h2>',
             i.make_table([],[],'from','to',context=False),
             '<h2>tabsize=2</h2>',
             j.make_table(f2,t2),
             '<h2>tabsize=default</h2>',
             i.make_table(f2,t2),
             '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
             k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
             '<h2>wrapcolumn=14,splitlines()</h2>',
             k.make_table(f3.splitlines(),t3.splitlines()),
             '<h2>wrapcolumn=14,splitlines(True)</h2>',
             k.make_table(f3.splitlines(True),t3.splitlines(True)),
             ])
        actual = full.replace('</body>','\n%s\n</body>' % tables)

        # temporarily uncomment next two lines to baseline this test
        #with open('test_difflib_expect.html','w') as fp:
        #    fp.write(actual)

        with open(findfile('test_difflib_expect.html')) as fp:
            self.assertEqual(actual, fp.read())

def test_html_diff(self):
        # Check SF patch 914575 for generating HTML differences
        f1a = ((patch914575_from1 + '123\n'*10)*3)
        t1a = (patch914575_to1 + '123\n'*10)*3
        f1b = '456\n'*10 + f1a
        t1b = '456\n'*10 + t1a
        f1a = f1a.splitlines()
        t1a = t1a.splitlines()
        f1b = f1b.splitlines()
        t1b = t1b.splitlines()
        f2 = patch914575_from2.splitlines()
        t2 = patch914575_to2.splitlines()
        f3 = patch914575_from3
        t3 = patch914575_to3
        i = difflib.HtmlDiff()
        j = difflib.HtmlDiff(tabsize=2)
        k = difflib.HtmlDiff(wrapcolumn=14)

        full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
        tables = '\n'.join(
            [
             '<h2>Context (first diff within numlines=5(default))</h2>',
             i.make_table(f1a,t1a,'from','to',context=True),
             '<h2>Context (first diff after numlines=5(default))</h2>',
             i.make_table(f1b,t1b,'from','to',context=True),
             '<h2>Context (numlines=6)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
             '<h2>Context (numlines=0)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
             '<h2>Same Context</h2>',
             i.make_table(f1a,f1a,'from','to',context=True),
             '<h2>Same Full</h2>',
             i.make_table(f1a,f1a,'from','to',context=False),
             '<h2>Empty Context</h2>',
             i.make_table([],[],'from','to',context=True),
             '<h2>Empty Full</h2>',
             i.make_table([],[],'from','to',context=False),
             '<h2>tabsize=2</h2>',
             j.make_table(f2,t2),
             '<h2>tabsize=default</h2>',
             i.make_table(f2,t2),
             '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
             k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
             '<h2>wrapcolumn=14,splitlines()</h2>',
             k.make_table(f3.splitlines(),t3.splitlines()),
             '<h2>wrapcolumn=14,splitlines(True)</h2>',
             k.make_table(f3.splitlines(True),t3.splitlines(True)),
             ])
        actual = full.replace('</body>','\n%s\n</body>' % tables)

        # temporarily uncomment next two lines to baseline this test
        #with open('test_difflib_expect.html','w') as fp:
        #    fp.write(actual)

        with open(findfile('test_difflib_expect.html')) as fp:
            self.assertEqual(actual, fp.read())

def check(language):
        """
        Ensure that external code files exist and check which external files
        have changed from what's in the .rst files. Generate files in the
        _deltas subdirectory showing what has changed.
        """
        class Result: # Messenger
            def __init__(self, `kwargs):
                self.__dict__ = kwargs
        result = Result(missing = [], deltas = [])
        listings = [Result(code = shift(code), file = f)
                    for f in restFiles for code in
                    language.listings.findall(open(f).read())]
        paths = [os.path.normpath(os.path.join("..", "code", path)) for path in
                    [listing.code[0].strip()[len(language.commentTag):].strip()
                     for listing in listings]]
        if os.path.exists("_deltas"):
            shutil.rmtree("_deltas")
        for path, listing in zip(paths, listings):
            if not os.path.exists(path):
                result.missing.append(path)
            else:
                code = open(path).read().splitlines()
                for i in difflib.ndiff(listing.code, code):
                    if i.startswith("+ ") or i.startswith("- "):
                        d = difflib.HtmlDiff()
                        if not os.path.exists("_deltas"):
                            os.makedirs("_deltas")
                        html = os.path.join("_deltas",
                            os.path.basename(path).split('.')[0] + ".html")
                        open(html, 'w').write(
                            "<html><h1>Left: %s<br>Right: %s</h1>" %
                            (listing.file, path) +
                            d.make_file(listing.code, code))
                        result.deltas.append(Result(file = listing.file,
                            path = path, html = html, code = code))
                        break
        if result.missing:
            print("Missing %s files:\n%s" %
                  (language.__name__, "\n".join(result.missing)))
        for delta in result.deltas:
            print("%s changed in %s; see %s" %
                  (delta.file, delta.path, delta.html))
        return result

def check(language):
        """
        Ensure that external code files exist and check which external files
        have changed from what's in the .rst files. Generate files in the
        _deltas subdirectory showing what has changed.
        """
        class Result: # Messenger
            def __init__(self, **kwargs):
                self.__dict__ = kwargs
        result = Result(missing = [], deltas = [])
        listings = [Result(code = shift(code), file = f)
                    for f in restFiles for code in
                    language.listings.findall(open(f).read())]
        paths = [os.path.normpath(os.path.join("..", "code", path)) for path in
                    [listing.code[0].strip()[len(language.commentTag):].strip()
                     for listing in listings]]
        if os.path.exists("_deltas"):
            shutil.rmtree("_deltas")
        for path, listing in zip(paths, listings):
            if not os.path.exists(path):
                result.missing.append(path)
            else:
                code = open(path).read().splitlines()
                for i in difflib.ndiff(listing.code, code):
                    if i.startswith("+ ") or i.startswith("- "):
                        d = difflib.HtmlDiff()
                        if not os.path.exists("_deltas"):
                            os.makedirs("_deltas")
                        html = os.path.join("_deltas",
                            os.path.basename(path).split('.')[0] + ".html")
                        open(html, 'w').write(
                            "<html><h1>Left: %s<br>Right: %s</h1>" %
                            (listing.file, path) +
                            d.make_file(listing.code, code))
                        result.deltas.append(Result(file = listing.file,
                            path = path, html = html, code = code))
                        break
        if result.missing:
            print("Missing %s files:\n%s" %
                  (language.__name__, "\n".join(result.missing)))
        for delta in result.deltas:
            print("%s changed in %s; see %s" %
                  (delta.file, delta.path, delta.html))
        return result

def check(language, verbose=True):
        """
        Ensure that external code files exist and check which external files
        have changed from what's in the .rst files. Generate files in the
        _deltas subdirectory showing what has changed.
        """
        class Result: # Messenger
            def __init__(self, **kwargs):
                self.__dict__ = kwargs
        result = Result(missing = [], deltas = [])
        listings = [Result(code = shift(code), file = f)
                    for f in restFiles for code in
                    language.listings.findall(open(f).read())]
        paths = [os.path.normpath(os.path.join("..", "code", path)) for path in
                    [listing.code[0].strip()[len(language.commentTag):].strip()
                     for listing in listings]]
        if os.path.exists("_deltas"):
            shutil.rmtree("_deltas")
        for path, listing in zip(paths, listings):
            if not os.path.exists(path):
                result.missing.append(path)
            else:
                code = open(path).read().splitlines()
                if difference(listing.code, code):
                    d = difflib.HtmlDiff()
                    if not os.path.exists("_deltas"):
                        os.makedirs("_deltas")
                    html = os.path.join("_deltas",
                        os.path.basename(path).split('.')[0] + ".html")
                    open(html, 'w').write(
                        "<html><h1>Left: %s<br>Right: %s</h1>" %
                        (listing.file, path) +
                        d.make_file(listing.code, code))
                    result.deltas.append(Result(file = listing.file,
                        path = path, html = html, code = code))
        if result.missing:
            print("Missing %s files:\n%s" %
                  (language.__name__, "\n".join(result.missing)))
        if verbose:
            for delta in result.deltas:
                print("%s <==> %s; see %s" %
                    (delta.file, delta.path, delta.html))
        return result

def test_html_diff(self):
        # Check SF patch 914575 for generating HTML differences
        f1a = ((patch914575_from1 + '123\n'*10)*3)
        t1a = (patch914575_to1 + '123\n'*10)*3
        f1b = '456\n'*10 + f1a
        t1b = '456\n'*10 + t1a
        f1a = f1a.splitlines()
        t1a = t1a.splitlines()
        f1b = f1b.splitlines()
        t1b = t1b.splitlines()
        f2 = patch914575_from2.splitlines()
        t2 = patch914575_to2.splitlines()
        f3 = patch914575_from3
        t3 = patch914575_to3
        i = difflib.HtmlDiff()
        j = difflib.HtmlDiff(tabsize=2)
        k = difflib.HtmlDiff(wrapcolumn=14)

        full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
        tables = '\n'.join(
            [
             '<h2>Context (first diff within numlines=5(default))</h2>',
             i.make_table(f1a,t1a,'from','to',context=True),
             '<h2>Context (first diff after numlines=5(default))</h2>',
             i.make_table(f1b,t1b,'from','to',context=True),
             '<h2>Context (numlines=6)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
             '<h2>Context (numlines=0)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
             '<h2>Same Context</h2>',
             i.make_table(f1a,f1a,'from','to',context=True),
             '<h2>Same Full</h2>',
             i.make_table(f1a,f1a,'from','to',context=False),
             '<h2>Empty Context</h2>',
             i.make_table([],[],'from','to',context=True),
             '<h2>Empty Full</h2>',
             i.make_table([],[],'from','to',context=False),
             '<h2>tabsize=2</h2>',
             j.make_table(f2,t2),
             '<h2>tabsize=default</h2>',
             i.make_table(f2,t2),
             '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
             k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
             '<h2>wrapcolumn=14,splitlines()</h2>',
             k.make_table(f3.splitlines(),t3.splitlines()),
             '<h2>wrapcolumn=14,splitlines(True)</h2>',
             k.make_table(f3.splitlines(True),t3.splitlines(True)),
             ])
        actual = full.replace('</body>','\n%s\n</body>' % tables)

        # temporarily uncomment next two lines to baseline this test
        #with open('test_difflib_expect.html','w') as fp:
        #    fp.write(actual)

        with open(findfile('test_difflib_expect.html')) as fp:
            self.assertEqual(actual, fp.read())

def test_html_diff(self):
        # Check SF patch 914575 for generating HTML differences
        f1a = ((patch914575_from1 + '123\n'*10)*3)
        t1a = (patch914575_to1 + '123\n'*10)*3
        f1b = '456\n'*10 + f1a
        t1b = '456\n'*10 + t1a
        f1a = f1a.splitlines()
        t1a = t1a.splitlines()
        f1b = f1b.splitlines()
        t1b = t1b.splitlines()
        f2 = patch914575_from2.splitlines()
        t2 = patch914575_to2.splitlines()
        f3 = patch914575_from3
        t3 = patch914575_to3
        i = difflib.HtmlDiff()
        j = difflib.HtmlDiff(tabsize=2)
        k = difflib.HtmlDiff(wrapcolumn=14)

        full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
        tables = '\n'.join(
            [
             '<h2>Context (first diff within numlines=5(default))</h2>',
             i.make_table(f1a,t1a,'from','to',context=True),
             '<h2>Context (first diff after numlines=5(default))</h2>',
             i.make_table(f1b,t1b,'from','to',context=True),
             '<h2>Context (numlines=6)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
             '<h2>Context (numlines=0)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
             '<h2>Same Context</h2>',
             i.make_table(f1a,f1a,'from','to',context=True),
             '<h2>Same Full</h2>',
             i.make_table(f1a,f1a,'from','to',context=False),
             '<h2>Empty Context</h2>',
             i.make_table([],[],'from','to',context=True),
             '<h2>Empty Full</h2>',
             i.make_table([],[],'from','to',context=False),
             '<h2>tabsize=2</h2>',
             j.make_table(f2,t2),
             '<h2>tabsize=default</h2>',
             i.make_table(f2,t2),
             '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
             k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
             '<h2>wrapcolumn=14,splitlines()</h2>',
             k.make_table(f3.splitlines(),t3.splitlines()),
             '<h2>wrapcolumn=14,splitlines(True)</h2>',
             k.make_table(f3.splitlines(True),t3.splitlines(True)),
             ])
        actual = full.replace('</body>','\n%s\n</body>' % tables)

        # temporarily uncomment next two lines to baseline this test
        #with open('test_difflib_expect.html','w') as fp:
        #    fp.write(actual)

        with open(findfile('test_difflib_expect.html')) as fp:
            self.assertEqual(actual, fp.read())

def test_html_diff(self):
        # Check SF patch 914575 for generating HTML differences
        f1a = ((patch914575_from1 + '123\n'*10)*3)
        t1a = (patch914575_to1 + '123\n'*10)*3
        f1b = '456\n'*10 + f1a
        t1b = '456\n'*10 + t1a
        f1a = f1a.splitlines()
        t1a = t1a.splitlines()
        f1b = f1b.splitlines()
        t1b = t1b.splitlines()
        f2 = patch914575_from2.splitlines()
        t2 = patch914575_to2.splitlines()
        f3 = patch914575_from3
        t3 = patch914575_to3
        i = difflib.HtmlDiff()
        j = difflib.HtmlDiff(tabsize=2)
        k = difflib.HtmlDiff(wrapcolumn=14)

        full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
        tables = '\n'.join(
            [
             '<h2>Context (first diff within numlines=5(default))</h2>',
             i.make_table(f1a,t1a,'from','to',context=True),
             '<h2>Context (first diff after numlines=5(default))</h2>',
             i.make_table(f1b,t1b,'from','to',context=True),
             '<h2>Context (numlines=6)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
             '<h2>Context (numlines=0)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
             '<h2>Same Context</h2>',
             i.make_table(f1a,f1a,'from','to',context=True),
             '<h2>Same Full</h2>',
             i.make_table(f1a,f1a,'from','to',context=False),
             '<h2>Empty Context</h2>',
             i.make_table([],[],'from','to',context=True),
             '<h2>Empty Full</h2>',
             i.make_table([],[],'from','to',context=False),
             '<h2>tabsize=2</h2>',
             j.make_table(f2,t2),
             '<h2>tabsize=default</h2>',
             i.make_table(f2,t2),
             '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
             k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
             '<h2>wrapcolumn=14,splitlines()</h2>',
             k.make_table(f3.splitlines(),t3.splitlines()),
             '<h2>wrapcolumn=14,splitlines(True)</h2>',
             k.make_table(f3.splitlines(True),t3.splitlines(True)),
             ])
        actual = full.replace('</body>','\n%s\n</body>' % tables)

        # temporarily uncomment next two lines to baseline this test
        #with open('test_difflib_expect.html','w') as fp:
        #    fp.write(actual)

        with open(findfile('test_difflib_expect.html')) as fp:
            self.assertEqual(actual, fp.read())

def test_html_diff(self):
        # Check SF patch 914575 for generating HTML differences
        f1a = ((patch914575_from1 + '123\n'*10)*3)
        t1a = (patch914575_to1 + '123\n'*10)*3
        f1b = '456\n'*10 + f1a
        t1b = '456\n'*10 + t1a
        f1a = f1a.splitlines()
        t1a = t1a.splitlines()
        f1b = f1b.splitlines()
        t1b = t1b.splitlines()
        f2 = patch914575_from2.splitlines()
        t2 = patch914575_to2.splitlines()
        f3 = patch914575_from3
        t3 = patch914575_to3
        i = difflib.HtmlDiff()
        j = difflib.HtmlDiff(tabsize=2)
        k = difflib.HtmlDiff(wrapcolumn=14)

        full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
        tables = '\n'.join(
            [
             '<h2>Context (first diff within numlines=5(default))</h2>',
             i.make_table(f1a,t1a,'from','to',context=True),
             '<h2>Context (first diff after numlines=5(default))</h2>',
             i.make_table(f1b,t1b,'from','to',context=True),
             '<h2>Context (numlines=6)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
             '<h2>Context (numlines=0)</h2>',
             i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
             '<h2>Same Context</h2>',
             i.make_table(f1a,f1a,'from','to',context=True),
             '<h2>Same Full</h2>',
             i.make_table(f1a,f1a,'from','to',context=False),
             '<h2>Empty Context</h2>',
             i.make_table([],[],'from','to',context=True),
             '<h2>Empty Full</h2>',
             i.make_table([],[],'from','to',context=False),
             '<h2>tabsize=2</h2>',
             j.make_table(f2,t2),
             '<h2>tabsize=default</h2>',
             i.make_table(f2,t2),
             '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
             k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
             '<h2>wrapcolumn=14,splitlines()</h2>',
             k.make_table(f3.splitlines(),t3.splitlines()),
             '<h2>wrapcolumn=14,splitlines(True)</h2>',
             k.make_table(f3.splitlines(True),t3.splitlines(True)),
             ])
        actual = full.replace('</body>','\n%s\n</body>' % tables)

        # temporarily uncomment next two lines to baseline this test
        #with open('test_difflib_expect.html','w') as fp:
        #    fp.write(actual)

        with open(findfile('test_difflib_expect.html')) as fp:
            self.assertEqual(actual, fp.read())

def compare_fiff(fname_1, fname_2, fname_out=None, show=True, indent='    ',
                 read_limit=np.inf, max_str=30, verbose=None):
    """Compare the contents of two fiff files using diff and show_fiff

    Parameters
    ----------
    fname_1 : str
        First file to compare.
    fname_2 : str
        Second file to compare.
    fname_out : str | None
        Filename to store the resulting diff. If None, a temporary
        file will be created.
    show : bool
        If True, show the resulting diff in a new tab in a web browser.
    indent : str
        How to indent the lines.
    read_limit : int
        Max number of bytes of data to read from a tag. Can be np.inf
        to always read all data (helps test read completion).
    max_str : int
        Max number of characters of string representation to print for
        each tag's data.
    verbose : bool, str, int, or None
        If not None, override default verbose level (see mne.verbose).

    Returns
    -------
    fname_out : str
        The filename used for storing the diff. Could be useful for
        when a temporary file is used.
    """
    file_1 = show_fiff(fname_1, output=list, indent=indent,
                       read_limit=read_limit, max_str=max_str)
    file_2 = show_fiff(fname_2, output=list, indent=indent,
                       read_limit=read_limit, max_str=max_str)
    diff = difflib.HtmlDiff().make_file(file_1, file_2, fname_1, fname_2)
    if fname_out is not None:
        f = open(fname_out, 'wb')
    else:
        f = tempfile.NamedTemporaryFile('wb', delete=False, suffix='.html')
        fname_out = f.name
    with f as fid:
        fid.write(diff.encode('utf-8'))
    if show is True:
        webbrowser.open_new_tab(fname_out)
    return fname_out