Proposal: Add option to mix format to create .formatter.exs

[eksperimental]

It happens that when I want to update a project that has been created
with an Elixir version prior to the introduction of the formatter,
I need to manually copy a .formatter.exs file. So I need to create a
new project and copy this file manually.

What I propose is to add an option called --create-formatter-file which
will create .formatter.exs only if this file does not exist.

[Wojtek Mach]

I am slightly -1 given, as you mentioned, you can very easily achieve it today:

cd /path/to/project && mix new foo && mv foo/.formatter.exs . && rm -rf foo



> On 13 Dec 2020, at 12:30, eksperimental <eksper...@autistici.org> wrote:
>
> It happens that when I want to update a project that has been created

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[Allen Wyma]

I think we should add this in, actually. The formatter is part of mix. If there's a way to either auto-create, warn, or tell the user what to do to create the formatter, that would be great.

I think using the method suggested by Wojtek is a bit too much for newcomers, or even may make elixir sound not so great if the solution is to create a new project and copy and paste the formatter file then remove the newly created project.

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