OmniSharp provides semantic classification of every symbol in a c# document. By default, OmniSharp-vim highlights most textual symbols, leaving language keywords and punctuation to be highlighted by Vim's standard regex-based highlighting system.
To modify OmniSharp-vim's defaults, create a g:OmniSharp_highlight_groups dictionary. The highlight groups may either be existing groups, or custom groups defined by the user:
let g:OmniSharp_highlight_groups = {
\ 'Comment': 'NonText',
\ 'XmlDocCommentName': 'Identifier',
\ 'XmlDocCommentText': 'NonText'
\}
To find out the classification name of the symbol or character under the cursor, use the :OmniSharpHighlightEcho command.
Below is the full list of available Roslyn classification type names, along with their default Vim highlight groups, as assigned by OmniSharp-vim
Name Default highlight group Comment ExcludedCode Identifier Identifier Keyword ControlKeyword NumericLiteral Operator OperatorOverloaded PreprocessorKeyword StringLiteral WhiteSpace Text StaticSymbol Identifier PreprocessorText Punctuation VerbatimStringLiteral StringEscapeCharacter ClassName Identifier DelegateName Identifier EnumName Identifier InterfaceName Include ModuleName StructName Identifier TypeParameterName Type FieldName Identifier EnumMemberName Identifier ConstantName Identifier LocalName Identifier ParameterName Identifier MethodName Function ExtensionMethodName Function PropertyName Identifier EventName Identifier NamespaceName Identifier LabelName Label XmlDocCommentAttributeName XmlDocCommentAttributeQuotes XmlDocCommentAttributeValue XmlDocCommentCDataSection XmlDocCommentComment XmlDocCommentDelimiter XmlDocCommentEntityReference XmlDocCommentName XmlDocCommentProcessingInstruction XmlDocCommentText XmlLiteralAttributeName XmlLiteralAttributeQuotes XmlLiteralAttributeValue XmlLiteralCDataSection XmlLiteralComment XmlLiteralDelimiter XmlLiteralEmbeddedExpression XmlLiteralEntityReference XmlLiteralName XmlLiteralProcessingInstruction XmlLiteralText RegexComment RegexCharacterClass RegexAnchor RegexQuantifier RegexGrouping RegexAlternation RegexText RegexSelfEscapedCharacter RegexOtherEscapeWhen Vim 8.1 text properties or neovim namespaces are not available, or when using the HTTP server, limited semantic highlighting is still possible by highlighting keywords. Note that this is not perfect - a keyword can only match a single highlight group, meaning that interfaces/classes/methods/parameters with the same name will be highlighted the same as each other.
The configuration options are also more limited. 4 highlight groups are defined for highlighting most code elements: csUserIdentifier, csUserInterface, csUserMethod and csUserType.
These highlight groups are defined as follows:
highlight default link csUserIdentifier Identifier highlight default link csUserInterface Include highlight default link csUserMethod Function highlight default link csUserType Type
To change a highlight group's colors, link it to another highlight group:
highlight link csUserType Identifier
Or define the group yourself:
highlight csUserInterface ctermfg=12 guifg=Blue
To disable a group, link it to Normal:
highlight link csUserMethod Normal
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