Add a group to the `file-detection` hooks.
There's no way to remove hooks without a group. With this patch, you'll be able to remove those
`file-detection` hooks manually. There's no need for two separate groups since if you wanted to
remove only one, you could run `remove-hooks` and then only add one again.
Related: #3670
This adds two things I forgot in
9a7d8df4 (Avoid accidentally using environment variables in sh scopes)
Mea culpa, the problem was that I was skipping matches with "filetype"
because that's usually just a hook parameter as in "WinSetOption filetype=.."
rg --pcre2 '\b(?!filetype=)\w+=' rc/
So I missed these two cases where a shell variable is actually called "filetype".
The one in git.kak was not a problem because show_git_cmd_output is only
ever called with sane inputs. However, file.kak does use the filetype
environment variable for many mime types, for example:
filetype=somefiletype\''; echo -debug injection; nop '\' kak /dev/null
Will run the echo since /dev/null has mime type "inode/chardevice"
The -i flag on Mac OS means:
჻ man file | grep -i -- -i
-i If the file is a regular file, do not classify its contents.
The --mime-type option is (mostly) portable:
- Linux uses --mime-type
- macOS uses --mime-type
- FreeBSD uses --mime-type
- NetBSD uses --mime-type
- OpenBSD uses --mime-type and does not use the same implementation as everybody else
- Solaris does not support MIME types at all
