How to show error code for shellcheck?

[coolaj86]

I believe I have the default configuration for vim-ale + shellcheck. When I get quickfix messages or run :messages I get stuff like this:

[shellcheck] Expressions don't expand in single quotes, use double quotes for that. [Info]

The problem is that it's missing the code - SC2016 in this case.

The code is important because quite often I'm doing something on purpose and I want to simply add # shellcheck disable=SC2016 on the line above, but I don't have the sort of brain that easily maps arbitrary numbers to information, so I can't remember which of the hundreds of codes are which, and have to look them up.

My preference would be that rather than showing [shellcheck] ... it would instead show [SC2016] ..., or at worst [shellcheck] SC2016: ....

Can I set some variable to change the output?

[coolaj86]

Apparently I had some years-old copy-pasta that was disabling the status code.

The fix:

let g:ale_echo_msg_format = '[%severity%] %code%: %s [%linter%]'

[Info] SC2016: Expressions don't expand in single quotes, use double quotes for that. [shellcheck]

Documentation at ~/.vim/pack/plugins/start/ale/doc/ale.txt:

g:ale_echo_msg_format                                   *g:ale_echo_msg_format*
                                                        *b:ale_echo_msg_format*

  Type: |String|
  Default: `'%code: %%s'`

  This variable defines a message format for echoed messages. The following
  sequences of characters will be replaced.

    `%s`           - replaced with the text for the problem
    `%...code...% `- replaced with the error code
    `%linter%`     - replaced with the name of the linter
    `%severity%`   - replaced with the severity of the problem (e.g. `Error`)
    `%type%`       - replaced with the type of the problem (e.g. `E`)

See also:

• Show "SCxxxx" error code in warning message koalaman/shellcheck#2731