SCRIPTDIR does not work

[indevsa]

Shellcheck's supports the SCRIPTDIR special value in its source and source-path to find sourced files in shell scripts. this doesn't seem to work in SublimeLinter-shellcheck.

As far as I can tell this is because the plugin passes the contents of a file to shellcheck's stdin, and not the path itself.

This could be fixed either by passing the file path itself, or by using shellcheck's -P/--source-path option.

[kaste]

I don't know if we should bake this in, depends on how long these flags are around. ... but you can probably do this manually already by using the argshttps://www.sublimelinter.com/en/latest/linter_settings.html#args setting. For example "args": ["source=$file"]" or source-path=$file_path should work.