This is more of a fix than a feature.
By adding the filename to --stdin-filename, mix format can detect the type of file. By default --stdin-filename is stdin.exs thus only allowing formatting of Elixir.
This change is needed to allow formatting for mix format plugins. Most notably the heex template files which are used in the Phoenix Framework, which comes with a heex plugin by default. (https://hexdocs.pm/phoenix_live_view/Phoenix.LiveView.HTMLFormatter.html)
stevearc
commented
2 months ago
This is more of a fix than a feature. By adding the filename to
--stdin-filename,mix formatcan detect the type of file. By default--stdin-filenameisstdin.exsthus only allowing formatting of Elixir. This change is needed to allow formatting formix formatplugins. Most notably theheextemplate files which are used in the Phoenix Framework, which comes with aheexplugin by default. (https://hexdocs.pm/phoenix_live_view/Phoenix.LiveView.HTMLFormatter.html)The
mix formatbehaviour is documented here: https://hexdocs.pm/mix/main/Mix.Tasks.Format.html#module-task-specific-options