Dart lsp Server Configuration Bug or Help

[nathananderson98]

I'm trying to change the default dart lsp formatter line length from 80 (default) to 120.

Sources:

• Looking at the base language config here
• Looking at the Dart lsp documentation here
• And the helix documentation here

Would lead me to believe that I can change the default dart.lineLength for my formatter, but I have not been able to ge anything to work.

I know my .config/helix/languages.toml is working because I can change the autoformat option on and off. Any help on this? Is this possible?

My languages.toml:

[[language]]
name = "dart"
# formatter = { command = "format", args = [ "-l", "120"] }  # I tried changing the format command, didn't work either
config = { lineLength = 120 }
# I tried all of these, refreshing the config each time, to no avail.
# config = { dart.lineLength = 120 }
# config = { "dart.lineLength" = 120 }
# config = { dartls.settings.dart.lineLength = 120 }
# config = { dart = { lineLength = 120 } }
# config = { settings = { dart = { lineLength = 120 } } }
# config = { dartls = { settings = { dart = { lineLength = 120 } } } }

[nathananderson98]

Only relevant Stack Overflow I could find, gave me the idea to try those other variations: link

[solgar]

So I have achieved custom line length in dart using helix by specifying custom formatter that is actually dart format. I also couldn't force dart lsp to format with custom line length.

I have added following text to my ~/.config/helix/languages.toml:

[[language]]
name = "dart"
formatter = {command = "dart", args = ["format", "-l", "120"]}

Funny thing is that -l or --line-length is actually hidden parameter of dart format https://github.com/dart-lang/dart_style/pull/1147/files#diff-81a62ea70b958516746798f662af162668e50464f0faf9d076cc17e2c6e73bd3 and is not printed when dart format --help -v.

[nathananderson98]

Ah, I can't believe I didnt try that. Thank you my good sir. I was manually calling dart format -l 120 before merging code at work, this will save me :)

[kirawi]

Saw this, and there is a special config.format section: https://docs.helix-editor.com/languages.html#language-server-configuration

[ncdm-stldr]

@nathananderson98 Late answer sorry, but in case it helps someone:

The config field for the LSP should be in the language server section, not the language section. Like this:

[language-server.dart]
config = { dart.lineLength = 120 }

I may be wrong, but it seems to me that the formatting is faster when using the LSP rather than the custom formatter = {command = "dart", args = ["format", "-l", "120"]}