Use sudo if required to read or stat a file

[SollyBunny]

If trying to modify a file which requires elevated permissions you have to make micro elevated which

1. my config!
2. not required

Draft because tests are failing and I would like to add more for this as there are lots of cases

First time doing anything proper with go

[SollyBunny]

Everything seems to work, here's what I have tested

For every file: make an edit and save it

sudo rm -rf /tmp/microtest
mkdir /tmp/microtest && cd /tmp/microtest

touch file

touch readonly
sudo chown root:root readonly
sudo chmod 444 readonly

touch writeonly
sudo chown root:root writeonly
sudo chmod 222 writeonly

touch root
sudo chown root:root
sudo chmod 777 writeonly

mkdir dir

mkdir rootdir
sudo chown root:root rootdir
sudo chmod 000 rootdir

sudo touch rootdir/file
sudo mkdir rootdir/dir

micro file
micro dir
micro readonly # new behaviour
micro writeonly # new behaviour
micro root # new behaviour
micro noexist

micro rootdir
micro rootdir/file # save doesnt support sudo inside unstatable yet
micro rootdir/dir # save doesnt support sudo inside unstatable yet

# micro rootdir/noexist/a # mkparents doesnt use sudo yet

[SollyBunny]

Now that loading is async, the tests need to wait for the buffers to be available.
There is the problem that there is no way of knowing when a command is done that I know off.
I have bodged it by just waiting 0.1s.
The cleanest solution I can think off is to add proper callbacks to everything but that's 100s of lines of code for just a tiny fix

[Andriamanitra]

I'm not convinced this feature is a good idea:

• no other editor I know of does it (I checked nano, nvim, emacs, helix)
• the implementation is fiddly and the sudo feature for writing files is already a common source of issues in micro (especially on Windows)
• you should probably be using sudo -e / sudoedit (or equivalent) if you want to edit something that requires superuser privileges ¹

Footnotes

1. https://superuser.com/questions/785187/sudoedit-why-use-it-over-sudo-vi ↩

[Andriamanitra]

I really do not like this line