Formating a *.erl file will cause error

[tan-wei]

Version:

• vscode_erlang: latest
• OS: Windows
• Erlang: V12.1.5

This message will be printed:

=ERROR REPORT==== 15-Dec-2021::08:16:58.526000 ===
LSP handler error error:undef while executing lsp_handlers:textDocument_formatting(_, #{options =>
                                                                                            #{insertSpaces =>
                                                                                                  true,
                                                                                              tabSize =>
                                                                                                  4},
                                                                                        textDocument =>
                                                                                            #{uri =>
                                                                                                  <<"file:///d%3A/DemoProjects/ErlangLearning/drop.erl">>}}), stacktrace:[{erl_tidy,
                                                                                                                                                                           file,
                                                                                                                                                                           ["c:/Users/WINTER~1/AppData/Local/Temp/25KJVDVJNTDR0.erl",
                                                                                                                                                                            [{backups,
                                                                                                                                                                              false},
                                                                                                                                                                             {idem,
                                                                                                                                                                              true}]],
                                                                                                                                                                           []},
                                                                                                                                                                          {lsp_handlers,
                                                                                                                                                                           textDocument_formatting,
                                                                                                                                                                           2,
                                                                                                                                                                           [{file,
                                                                                                                                                                             "src/lsp_handlers.erl"},
                                                                                                                                                                            {line,
                                                                                                                                                                             158}]},
                                                                                                                                                                          {gen_lsp_server,
                                                                                                                                                                           safeApply,
                                                                                                                                                                           3,
                                                                                                                                                                           [{file,
                                                                                                                                                                             "src/gen_lsp_server.erl"},
                                                       `                                                                                                                     {line,
                                                                                                                                                                             26}]},
                                                                                                                                                                          {gen_lsp_server,
                                                                                                                                                                           do_contents,
                                                                                                                                                                           2,
                                                                                                                                                                           [{file,
                                                                                                                                                                             "src/gen_lsp_server.erl"},
                                                                                                                                                                            {line,
                                                                                                                                                                             104}]}]

[pgourlain]

Hi Tan,

Can you provide "drop.erl", in order to reproduce it on my laptop.

thanks.

[tan-wei]

No problem. The code here is from book Introducing Erlang published by O'Reilly:

-module(drop).

-export([fall_velocity/2]).

fall_velocity(Planemo, Distance) when Distance >= 0 ->
    case Planemo of
        earth ->
            math:sqrt(2 * 9.8 * Distance);
        moon ->
            math:sqrt(2 * 1.6 * Distance);
        mars ->
            math:sqrt(2 * 3.71 * Distance)  % no closing period!
    end.

Quite an easy code with rebar.config in the project:

{plugins, [rebar3_format]}.

I'm quite new in Erlang, so maybe there is something wrong with my project settings. But I can't find further information in the repo, so I open an issue here to ask whether is my own problem.

Thanks for such a great project and quick reply.

[tan-wei]

Manual command works with formatter now:

rebar3 format --files ./drop.erl

[wojteksurowka]

Fixed by #224

[tan-wei]

Thanks. Waiting for the PR is merged.

[tan-wei]

I can confirm that the issue should be closed. Thanks!

[tan-wei]

A strange phenomenon. I create a new file records.hrl which comes from book Introducing Erlang:

-record(planemo, {name, gravity, diameter, distance_from_sun}).
-record(tower, {location, height=20, planemo=earth, name}).

After I save with formatting it, the file becomes empty. It seems elfmt clear it all. But if I use manual command:

rebar3 format --files ./records.hrl

It will correctly format the file (see spaces around =):

-record(planemo, {name, gravity, diameter, distance_from_sun}).
-record(tower, {location, height = 20, planemo = earth, name}).

Is it special case for elfmt to process *.hrl files?

[tan-wei]

Solved. Thanks!