Return to Answer

You can create a file in your sketch directory with the following content and the problem should go away. These are derived from IDE v2.3.6. For future versions it may be better to use original sources mentioned below.

You may want to play around with the other options to see if you can find a better way of going about it. You don't need to reload the IDE or anything. You can modify that file and hit CTRL+T in the IDE until it does what you want, or at least until it does something you can stand. There do seem to exist web based tools for generating/editing clang format configurations that will give you a preview.

You can create a file named .clang-format in your sketch directory with the following content and the problem should go away. These are derived from IDE v2.3.6. For future versions it may be better to use original sources mentioned below.

The above is based options from the arduino-ide source repo. However, Edgar Bonet mentioned in a comment below:

Note that clang-format has decent default settings, which include ColumnLimit: 80. Thus, an empty style file is enough to avoid the overlong line. A style file with the single line PenaltyIndentedWhitespace: 1 would already give a decent formatting.

You may want to play around with the other options to see if you can find a better way of going about it. Arduino IDE 2.3.6 bundles clang-format version 14.0.0.

You don't need to reload the IDE or anything. You can modify that file and hit CTRL+T in the IDE until it does what you want, or at least until it does something you can stand. There do seem to exist web based tools for generating/editing clang format configurations that will give you a preview.

AccessModifierOffset: -2
AlignAfterOpenBracket: Align
AlignArrayOfStructures: None
AlignConsecutiveAssignments: None
AlignConsecutiveBitFields: None
AlignConsecutiveDeclarations: None
AlignConsecutiveMacros: None
AlignEscapedNewlines: DontAlign
AlignOperands: Align
AlignTrailingComments: true
AllowAllArgumentsOnNextLine: true
AllowAllConstructorInitializersOnNextLine: true
AllowAllParametersOfDeclarationOnNextLine: true
AllowShortBlocksOnASingleLine: Always
AllowShortCaseLabelsOnASingleLine: true
AllowShortEnumsOnASingleLine: true
AllowShortFunctionsOnASingleLine: Empty
AllowShortIfStatementsOnASingleLine: AllIfsAndElse
AllowShortLambdasOnASingleLine: Empty
AllowShortLoopsOnASingleLine: true
AlwaysBreakAfterDefinitionReturnType: None
AlwaysBreakAfterReturnType: None
AlwaysBreakBeforeMultilineStrings: false
AlwaysBreakTemplateDeclarations: No
AttributeMacros:
- __capability
BasedOnStyle: LLVM
BinPackArguments: true
BinPackParameters: true
BitFieldColonSpacing: Both
BraceWrapping:
  AfterCaseLabel: false
  AfterClass: false
  AfterControlStatement: Never
  AfterEnum: false
  AfterFunction: false
  AfterNamespace: false
  AfterObjCDeclaration: false
  AfterStruct: false
  AfterUnion: false
  AfterExternBlock: false
  BeforeCatch: false
  BeforeElse: false
  BeforeLambdaBody: false
  BeforeWhile: false
  IndentBraces: false
  SplitEmptyFunction: true
  SplitEmptyRecord: true
  SplitEmptyNamespace: true
BreakAfterJavaFieldAnnotations: false
BreakBeforeBinaryOperators: NonAssignment
BreakBeforeBraces: Attach
BreakBeforeConceptDeclarations: false
BreakBeforeInheritanceComma: false
BreakBeforeTernaryOperators: true
BreakConstructorInitializers: BeforeColon
BreakConstructorInitializersBeforeComma: false
BreakInheritanceList: BeforeColon
BreakStringLiterals: false
ColumnLimit: 0
CommentPragmas: ''
CompactNamespaces: false
ConstructorInitializerAllOnOneLineOrOnePerLine: false
ConstructorInitializerIndentWidth: 2
ContinuationIndentWidth: 2
Cpp11BracedListStyle: false
BreakAfterOpenBracketBracedList: true #<----------------------
DeriveLineEnding: true
DerivePointerAlignment: true
DisableFormat: false
EmptyLineAfterAccessModifier: Leave
EmptyLineBeforeAccessModifier: Leave
ExperimentalAutoDetectBinPacking: false
FixNamespaceComments: false
ForEachMacros:
- foreach
- Q_FOREACH
- BOOST_FOREACH
IfMacros:
- KJ_IF_MAYBE
IncludeBlocks: Preserve
IncludeCategories:
- Regex: ^"(llvm|llvm-c|clang|clang-c)/
  Priority: 2
  SortPriority: 0
  CaseSensitive: false
- Regex: ^(<|"(gtest|gmock|isl|json)/)
  Priority: 3
  SortPriority: 0
  CaseSensitive: false
- Regex: .*
  Priority: 1
  SortPriority: 0
  CaseSensitive: false
IncludeIsMainRegex: ''
IncludeIsMainSourceRegex: ''
IndentAccessModifiers: false
IndentCaseBlocks: true
IndentCaseLabels: true
IndentExternBlock: Indent
IndentGotoLabels: false
IndentPPDirectives: None
IndentRequires: true
IndentWidth: 2
IndentWrappedFunctionNames: false
InsertTrailingCommas: None
JavaScriptQuotes: Leave
JavaScriptWrapImports: true
KeepEmptyLinesAtTheStartOfBlocks: true
LambdaBodyIndentation: Signature
Language: Cpp
MacroBlockBegin: ''
MacroBlockEnd: ''
MaxEmptyLinesToKeep: 100000
NamespaceIndentation: None
ObjCBinPackProtocolList: Auto
ObjCBlockIndentWidth: 2
ObjCBreakBeforeNestedBlockParam: true
ObjCSpaceAfterProperty: false
ObjCSpaceBeforeProtocolList: true
PPIndentWidth: -1
PackConstructorInitializers: BinPack
PenaltyBreakAssignment: 1
PenaltyBreakBeforeFirstCallParameter: 1
PenaltyBreakComment: 1
PenaltyBreakFirstLessLess: 1
PenaltyBreakOpenParenthesis: 1
PenaltyBreakString: 1
PenaltyBreakTemplateDeclaration: 1
PenaltyExcessCharacter: 1
PenaltyIndentedWhitespace: 1
PenaltyReturnTypeOnItsOwnLine: 1
PointerAlignment: Right
QualifierAlignment: Leave
ReferenceAlignment: Pointer
ReflowComments: false
RemoveBracesLLVM: false
SeparateDefinitionBlocks: Leave
ShortNamespaceLines: 0
SortIncludes: Never
SortJavaStaticImport: Before
SortUsingDeclarations: false
SpaceAfterCStyleCast: false
SpaceAfterLogicalNot: false
SpaceAfterTemplateKeyword: false
SpaceAroundPointerQualifiers: Default
SpaceBeforeAssignmentOperators: true
SpaceBeforeCaseColon: false
SpaceBeforeCpp11BracedList: false
SpaceBeforeCtorInitializerColon: true
SpaceBeforeInheritanceColon: true
SpaceBeforeParens: ControlStatements
SpaceBeforeParensOptions:
  AfterControlStatements: true
  AfterForeachMacros: true
  AfterFunctionDefinitionName: false
  AfterFunctionDeclarationName: false
  AfterIfMacros: true
  AfterOverloadedOperator: false
  BeforeNonEmptyParentheses: false
SpaceBeforeRangeBasedForLoopColon: true
SpaceBeforeSquareBrackets: false
SpaceInEmptyBlock: false
SpaceInEmptyParentheses: false
SpacesBeforeTrailingComments: 2
SpacesInAngles: Leave
SpacesInCStyleCastParentheses: false
SpacesInConditionalStatement: false
SpacesInContainerLiterals: false
SpacesInLineCommentPrefix:
  Minimum: 0
  Maximum: -1
SpacesInParentheses: false
SpacesInSquareBrackets: false
Standard: Auto
StatementAttributeLikeMacros:
- Q_EMIT
StatementMacros:
- Q_UNUSED
- QT_REQUIRE_VERSION
TabWidth: 2
UseCRLF: false
UseTab: Never
WhitespaceSensitiveMacros:
- STRINGIZE
- PP_STRINGIZE
- BOOST_PP_STRINGIZE
- NS_SWIFT_NAME
- CF_SWIFT_NAME

I tend to just manually format things, so I'm not overly familiar with the formatting options. The active ingredient is this BreakAfterOpenBracketBracedList: true. Initially I adjusted ColumnLimit to at least clamp the code to the screen. I set that back to 0 (no limit) when BreakAfterOpenBracketBracedList seemed to do the job.

All I did was convert that file to yaml, and add the BreakAfterOpenBracketBracedList to it.

AccessModifierOffset: -2
AlignAfterOpenBracket: Align
AlignArrayOfStructures: None
AlignConsecutiveAssignments: None
AlignConsecutiveBitFields: None
AlignConsecutiveDeclarations: None
AlignConsecutiveMacros: None
AlignEscapedNewlines: DontAlign
AlignOperands: Align
AlignTrailingComments: true
AllowAllArgumentsOnNextLine: true
AllowAllConstructorInitializersOnNextLine: true
AllowAllParametersOfDeclarationOnNextLine: true
AllowShortBlocksOnASingleLine: Always
AllowShortCaseLabelsOnASingleLine: true
AllowShortEnumsOnASingleLine: true
AllowShortFunctionsOnASingleLine: Empty
AllowShortIfStatementsOnASingleLine: AllIfsAndElse
AllowShortLambdasOnASingleLine: Empty
AllowShortLoopsOnASingleLine: true
AlwaysBreakAfterDefinitionReturnType: None
AlwaysBreakAfterReturnType: None
AlwaysBreakBeforeMultilineStrings: false
AlwaysBreakTemplateDeclarations: No
AttributeMacros:
- __capability
BasedOnStyle: LLVM
BinPackArguments: true
BinPackParameters: true
BitFieldColonSpacing: Both
BraceWrapping:
  AfterCaseLabel: false
  AfterClass: false
  AfterControlStatement: Never
  AfterEnum: false
  AfterFunction: false
  AfterNamespace: false
  AfterObjCDeclaration: false
  AfterStruct: false
  AfterUnion: false
  AfterExternBlock: false
  BeforeCatch: false
  BeforeElse: false
  BeforeLambdaBody: false
  BeforeWhile: false
  IndentBraces: false
  SplitEmptyFunction: true
  SplitEmptyRecord: true
  SplitEmptyNamespace: true
BreakAfterJavaFieldAnnotations: false
BreakBeforeBinaryOperators: NonAssignment
BreakBeforeBraces: Attach
BreakBeforeConceptDeclarations: false
BreakBeforeInheritanceComma: false
BreakBeforeTernaryOperators: true
BreakConstructorInitializers: BeforeColon
BreakConstructorInitializersBeforeComma: false
BreakInheritanceList: BeforeColon
BreakStringLiterals: false
ColumnLimit: 80 #<---------------
CommentPragmas: ''
CompactNamespaces: false
ConstructorInitializerAllOnOneLineOrOnePerLine: false
ConstructorInitializerIndentWidth: 2
ContinuationIndentWidth: 2
Cpp11BracedListStyle: false
#BreakAfterOpenBracketBracedList: true
DeriveLineEnding: true
DerivePointerAlignment: true
DisableFormat: false
EmptyLineAfterAccessModifier: Leave
EmptyLineBeforeAccessModifier: Leave
ExperimentalAutoDetectBinPacking: false
FixNamespaceComments: false
ForEachMacros:
- foreach
- Q_FOREACH
- BOOST_FOREACH
IfMacros:
- KJ_IF_MAYBE
IncludeBlocks: Preserve
IncludeCategories:
- Regex: ^"(llvm|llvm-c|clang|clang-c)/
  Priority: 2
  SortPriority: 0
  CaseSensitive: false
- Regex: ^(<|"(gtest|gmock|isl|json)/)
  Priority: 3
  SortPriority: 0
  CaseSensitive: false
- Regex: .*
  Priority: 1
  SortPriority: 0
  CaseSensitive: false
IncludeIsMainRegex: ''
IncludeIsMainSourceRegex: ''
IndentAccessModifiers: false
IndentCaseBlocks: true
IndentCaseLabels: true
IndentExternBlock: Indent
IndentGotoLabels: false
IndentPPDirectives: None
IndentRequires: true
IndentWidth: 2
IndentWrappedFunctionNames: false
InsertTrailingCommas: None
JavaScriptQuotes: Leave
JavaScriptWrapImports: true
KeepEmptyLinesAtTheStartOfBlocks: true
LambdaBodyIndentation: Signature
Language: Cpp
MacroBlockBegin: ''
MacroBlockEnd: ''
MaxEmptyLinesToKeep: 100000
NamespaceIndentation: None
ObjCBinPackProtocolList: Auto
ObjCBlockIndentWidth: 2
ObjCBreakBeforeNestedBlockParam: true
ObjCSpaceAfterProperty: false
ObjCSpaceBeforeProtocolList: true
PPIndentWidth: -1
PackConstructorInitializers: BinPack
PenaltyBreakAssignment: 1
PenaltyBreakBeforeFirstCallParameter: 1
PenaltyBreakComment: 1
PenaltyBreakFirstLessLess: 1
PenaltyBreakOpenParenthesis: 1
PenaltyBreakString: 1
PenaltyBreakTemplateDeclaration: 1
PenaltyExcessCharacter: 1
PenaltyIndentedWhitespace: 1
PenaltyReturnTypeOnItsOwnLine: 1
PointerAlignment: Right
QualifierAlignment: Leave
ReferenceAlignment: Pointer
ReflowComments: false
RemoveBracesLLVM: false
SeparateDefinitionBlocks: Leave
ShortNamespaceLines: 0
SortIncludes: Never
SortJavaStaticImport: Before
SortUsingDeclarations: false
SpaceAfterCStyleCast: false
SpaceAfterLogicalNot: false
SpaceAfterTemplateKeyword: false
SpaceAroundPointerQualifiers: Default
SpaceBeforeAssignmentOperators: true
SpaceBeforeCaseColon: false
SpaceBeforeCpp11BracedList: false
SpaceBeforeCtorInitializerColon: true
SpaceBeforeInheritanceColon: true
SpaceBeforeParens: ControlStatements
SpaceBeforeParensOptions:
  AfterControlStatements: true
  AfterForeachMacros: true
  AfterFunctionDefinitionName: false
  AfterFunctionDeclarationName: false
  AfterIfMacros: true
  AfterOverloadedOperator: false
  BeforeNonEmptyParentheses: false
SpaceBeforeRangeBasedForLoopColon: true
SpaceBeforeSquareBrackets: false
SpaceInEmptyBlock: false
SpaceInEmptyParentheses: false
SpacesBeforeTrailingComments: 2
SpacesInAngles: Leave
SpacesInCStyleCastParentheses: false
SpacesInConditionalStatement: false
SpacesInContainerLiterals: false
SpacesInLineCommentPrefix:
  Minimum: 0
  Maximum: -1
SpacesInParentheses: false
SpacesInSquareBrackets: false
Standard: Auto
StatementAttributeLikeMacros:
- Q_EMIT
StatementMacros:
- Q_UNUSED
- QT_REQUIRE_VERSION
TabWidth: 2
UseCRLF: false
UseTab: Never
WhitespaceSensitiveMacros:
- STRINGIZE
- PP_STRINGIZE
- BOOST_PP_STRINGIZE
- NS_SWIFT_NAME
- CF_SWIFT_NAME

I tend to just manually format things, so I'm not overly familiar with the formatting options. The active ingredient is this BreakAfterOpenBracketBracedList: true. Initially I adjusted ColumnLimit to at least clamp the code to the screen. I set that back to 0 (no limit) when BreakAfterOpenBracketBracedList seemed to do the job. I noticed that broke formatting altogether in the IDE doing this, so I've temporarily changed the configuration to use ColumnLimit: 80. Apparently I was testing outside the IDE as well with a newer version of clang-format. If I find a better option, I'll update to that.

All I did was convert that file to yaml, and add the BreakAfterOpenBracketBracedListColumnLimit: 80 to it.

I tend to just manually format things, so I'm not overly familiar with the formatting options. The active ingredient is this BreakAfterOpenBracketBracedList: true. Initially I adjusted ColumnLimit to at least clamp the code to the screen. I set that back when BreakAfterOpenBracketBracedList seemed to do the job.

All I did was converted that file to yaml, and add the BreakAfterOpenBracketBracedList to it.

I tend to just manually format things, so I'm not overly familiar with the formatting options. The active ingredient is this BreakAfterOpenBracketBracedList: true. Initially I adjusted ColumnLimit to at least clamp the code to the screen. I set that back to 0 (no limit) when BreakAfterOpenBracketBracedList seemed to do the job.

All I did was convert that file to yaml, and add the BreakAfterOpenBracketBracedList to it.