Is. #681 - read-only files, and dirs

[geoffmcl]

Please test, and report/comment in issue #681... thanks...

[jmadiot]

Hello, thank you for the fix! This fixes the problem for me (linux). I detail here what I did for @geoffmcl to check that I correctly tested and maybe to make it easier for others to test:

mkdir /tmp/testtidy
cd /tmp/testtidy
git clone https://github.com/htacg/tidy-html5.git
cd tidy-html5/
git switch issue-681
cd build/cmake/
cmake ../.. -DCMAKE_BUILD_TYPE=Release
make
echo "foo" > foo.html
./tidy foo.html
# correct output
chmod -w foo.html
./tidy foo.html
# also correct output!
# I also check that the branch next had the problem:
git switch next
make
./tidy foo.html
# expectedly got the error of issue 681: Document: "foo.html" is not a file!
chmod +w foo.html
./tidy foo.html
# normal output again