Please don’t… I was born 1981, not 1_981…

You can have all of them on the same line if you want to:

case foo do
  {:ok, bar} -> {:ok, bar}
  {:error, baz} -> {:error, baz}
end

But if you have newlines after ->, then the formatter will respect that and proceed to add an empty line between each clause.

Remember the goal of the formatter is to make the code consistent. The opposite of the current behaviour would be to remove lines between clauses, which would affect different areas of @Crowdhailer’s repository. I think users would very likely be more upset if we remove the empty lines they added to space out code.

Between the two below, one is definitely more readable than the other for me (although I agree it is subjective):

defp integer_to_algebra(text) do
    case text do
      [?0, ?x | rest] ->
        "0x" <> String.upcase(List.to_string(rest))
      [?0, base | _rest] = digits when base in [?b, ?o] ->
        List.to_string(digits)
      [?? | _rest] = char ->
        List.to_string(char)
      decimal ->
        List.to_string(insert_underscores(decimal))
    end
  end

and

defp integer_to_algebra(text) do
    case text do
      [?0, ?x | rest] ->
        "0x" <> String.upcase(List.to_string(rest))

      [?0, base | _rest] = digits when base in [?b, ?o] ->
        List.to_string(digits)

      [?? | _rest] = char ->
        List.to_string(char)

      decimal ->
        List.to_string(insert_underscores(decimal))
    end
  end

We will open up a discussion on that.

# install erlang with homebre
brew install erlang

# install asdf to manage Elixir versions
if [ -d "$HOME/asdf" ]; then
  git clone https://github.com/asdf-vm/asdf.git "$HOME/.asdf" --branch v0.4.0
fi

# don't forget to add following part to your shell config (e.g. .bashrc)
. "$HOME/.asdf/asdf.sh"

# install elixir plugin if missing
plugins=$(asdf plugin-list)
if grep -q -v elixir <<< "$plugins"; then
  asdf plugin-add elixir https://github.com/asdf-vm/asdf-elixir.git
fi

# install with asdf as in .tool-versions
asdf install

# install master version
asdf install elixir ref:master

# run mix format with elixir master
ASDF_ELIXIR_VERSION=ref-master mix format

I have mix_format alias in my ~/.alias

alias mix_format="ASDF_ELIXIR_VERSION=ref-master mix format"