Support Conditional Formatting and Extra Arguments

[barrett-ruth]

In null-ls one can avoid formatting if a certain "condition" is not met like so:

        diagnostics.eslint_d.with({
            condition = function(utils)
                return utils.root_has_file({
                    {
                        '.eslintrc',
                        '.eslintrc.cjs',
                        '.eslintrc.yaml',
                        '.eslintrc.yml',
                        '.eslintrc.json',
                    },
                })
            end,
        }),

One can also pass extra arguments to a source:

        diagnostics.sqlfluff.with({
            extra_args = {
                '--dialect',
                'postgres',
                '--exclude-rules',
                'LT02,LT05',
            },
        }),

I think these are two more relevant features that are important to be implemented, although I think customizability should indeed be kept to a minimum.

[glepnir]

I will implement these.

[glepnir]

tool now has find field type is string or table of config files . filetype module support extra DSL you can use it like

ft('c'):fmt('clang-format'):extra(argument1, argument2,argument3,...):lint('clang-tidy'):extra(....)