Allow reading from stdin

[ehamberg]

It would be great if erlfmt supported reading from stdin (e.g. when passed --stdin) so that it can be used by editor plugins such as https://github.com/lassik/emacs-format-all-the-code that pass a buffer's content to the formatter instead of operating on a file on disk.

[awalterschulze]

This is a great idea :) We will look into adding it.

[awalterschulze]

This feature is being added in #50

Thanks again for the great idea :)

[ehamberg]

Thank you so much! Works great!

In case any doom emacs users stumble over this issue: You can now use erlfmt to format erlang buffers by adding the following to config.el:

(set-formatter! 'erlfmt  "erlfmt -" :modes '(erlang-mode))

[awalterschulze]

Happy to hear it works so well :)

Maybe we should make even easier to spot this tip.
#55

[Benjamin-Philip]

Thank you so much! Works great!

In case any doom emacs users stumble over this issue: You can now use erlfmt to format erlang buffers by adding the following to config.el:

(set-formatter! 'erlfmt  "erlfmt -" :modes '(erlang-mode))

This does not seem to work with rebar3:

 (set-formatter! 'erlfmt  "rebar3 fmt -" :modes '(erlang-mode))

Could you update your comment to what you use now, incase there has been some change to set-formatter!?

[ehamberg]

Could you update your comment to what you use now, incase there has been some change to set-formatter!?

I still use the same config. However, I don't use erlfmt through rebar3, I call it directly. Not sure if rebar3 fmt supports reading from stdin.

[michalmuskala]

Even if reading from stdin with rebar3 worked fine, I think outputting to stdout might actually not - rebar3 output is quite verbose and sometimes quite random if things go to stdout or stderr. With standalone escript we can control it all, but running as a rebar3 plugin this is more complicated.