Customization

Keyboard shortcuts (key bindings)#

LSP's key bindings can be edited from the Preferences: LSP Key Bindings command in the Command Palette. Many of the default key bindings (visible in the left view) are disabled to avoid conflicts with default or user key bindings. To enable those, copy them to your user key bindings on the right, un-comment, and pick the key shortcut of your choice. Check also the overview of available Keyboard Shortcuts.

If you want to create a new key binding that is different from the ones that are already included, you might want to make it active only when there is a language server with a specific LSP capability (refer to the ServerCapabilities structure in that link) running. In that case, you can make use of the lsp.session_with_capability context. For example, the following key binding overrides ctrl+r to use LSP's symbol provider but only when the current view has a language server with the documentSymbolProvider capability and we're in a javascript or a typescript file:

Packages/User/Default.sublime-keymap

{
    "command": "lsp_document_symbols",
    "keys": [
        "ctrl+r"
    ],
    "context": [
        {
            "key": "lsp.session_with_capability",
            "operator": "equal",
            "operand": "documentSymbolProvider"
        },
        {
            "key": "selector",
            "operator": "equal",
            "operand": "source.ts, source.js"
        }
    ]
},

Generally, you should not need to restrict your key bindings to specific scopes and just rely on checking the capability context.

Mouse map configuration#

If you want to bind some action to a mouse, select Preferences / Mouse Bindings from the main menu and edit the file on the righthand side.

Here is an example of a mouse binding that triggers LSP's "go to symbol definition" command on pressing the ctrl+left click:

Packages/User/Default.sublime-mousemap

[
    {
        "button": "button1",
        "count": 1,
        "modifiers": ["ctrl"],
        "press_command": "drag_select",
        "command": "lsp_symbol_definition",
    }
]

Hover popups#

LSP uses mdpopups to display the popup. You can override its style by creating a Packages/User/mdpopups.css file. In particular, to get the same font in the popup as your "font_face" setting in Packages/User/Preferences.sublime-settings, add

Packages/User/mdpopups.css

html {
    --mdpopups-font-mono: "your desired font face";
}

See the mdpopups documentation for more details.

Inlay Hints#

The styles for inlay hints are defined in the inlay_hints.css file in the root directory of the LSP package. If you would like to adjust the inlay hints style, you can create an override for this file (a restart of Sublime Text is required to apply the changes). But be aware that by doing this, you might miss out on future changes in this file, in case of updates in a new release of the LSP package. So consider using a package like OverrideAudit to get a notification when that happens.

Color scheme customizations#

Some features use TextMate scopes to control the colors (underline, background or text color) of styled regions in a document or popup. Colors can be customized by adding a rule for these scopes into your color scheme. There is an example in the official ST documentation which explains how to do that.

The following tables give an overview of the scope names used by LSP.

Semantic Highlighting#

Note

Semantic highlighting is disabled by default. To enable it, set "semantic_highlighting": true in your LSP user settings.

This feature is only available if the server has the semanticTokensProvider capability.

Language servers that support semantic highlighting are for example clangd and rust-analyzer.

In order to support semantic highlighting, the color scheme requires a special rule with a background color set for semantic tokens, which is (marginally) different from the original background. LSP automatically adds such a rule to the built-in color schemes from Sublime Text. If you use a custom color scheme, select UI: Customize Color Scheme from the Command Palette and add for example the following code:

{
    "rules": [
        {
            "scope": "meta.semantic-token",
            "background": "#00000101"
        },
    ]
}

Furthermore, it is possible to adjust the colors for semantic tokens by applying a foreground color to the individual token types:

scope	Semantic Token Type
`meta.semantic-token.namespace`	namespace
`meta.semantic-token.type`	type
`meta.semantic-token.class`	class
`meta.semantic-token.enum`	enum
`meta.semantic-token.interface`	interface
`meta.semantic-token.struct`	struct
`meta.semantic-token.typeparameter`	typeParameter
`meta.semantic-token.parameter`	parameter
`meta.semantic-token.variable`	variable
`meta.semantic-token.property`	property
`meta.semantic-token.enummember`	enumMember
`meta.semantic-token.event`	event
`meta.semantic-token.function`	function
`meta.semantic-token.method`	method
`meta.semantic-token.macro`	macro
`meta.semantic-token.keyword`	keyword
`meta.semantic-token.modifier`	modifier
`meta.semantic-token.comment`	comment
`meta.semantic-token.string`	string
`meta.semantic-token.number`	number
`meta.semantic-token.regexp`	regexp
`meta.semantic-token.operator`	operator
`meta.semantic-token.decorator`	decorator

By default, LSP will assign scopes based on the scope naming guideline to each of these token types, but if you define color scheme rules for the scopes specified above, the latter will take precedence.

Language servers can also add their custom token types, which are not defined in the protocol. An "LSP-*" helper package (or user) can provide a semantic_tokens mapping in the server configuration for such additional token types, or to override the scopes used for the predefined tokens from the table above. The keys of this mapping should be the token types and values should be the corresponding scopes. Semantic tokens with exactly one token modifier can be addressed by appending the modifier after a dot.

{
    "semantic_tokens": {
        "magicFunction": "support.function.builtin",
        "selfParameter": "variable.language",
        "type.defaultLibrary": "storage.type.builtin"
    }
}

The color for custom token types can also be adjusted via a color scheme rule for the scope meta.semantic-token.<token-type>, where <token-type> is the name of the custom token type, but with all letters lowercased (similar to the listed scopes in the table above). To target tokens with one modifier, use the scope meta.semantic-token.<token-type>.<token-modifier> (all lowercase). Currently, semantic tokens with more than one modifier cannot be styled reliably.

If neither a scope for a custom token type is defined, nor a color scheme rule for this token type exists, then it will only be highlighted via regular syntax highlighting.

Document Highlights#

This feature is only available if the server has the documentHighlightProvider capability.

Highlights other occurrences of the symbol at a given cursor position.

scope	DocumentHighlightKind	description
`markup.highlight.text.lsp`	Text	A textual occurrence
`markup.highlight.read.lsp`	Read	Read-access of a symbol, like reading a variable
`markup.highlight.write.lsp`	Write	Write-access of a symbol, like writing to a variable

Note

If document_highlight_style is set to "background" in the LSP settings, the highlighting color can be controlled via the "background" color from a color scheme rule for the listed scopes.

Hover Highlights#

Allows to highlight the word or range for which a hover popup is shown (disabled by default).

scope
`markup.highlight.hover.lsp`

Note

If hover_highlight_style is set to "background" in the LSP settings, the highlighting color can be controlled via the "background" color from a color scheme rule.

Diagnostics#

scope	DiagnosticSeverity	description	drawn as
`markup.error.lsp`	Error	Reports an error	Squiggly underlines
`markup.warning.lsp`	Warning	Reports a warning	Squiggly underlines
`markup.info.lsp`	Information	Reports an information	Stippled underlines
`markup.info.hint.lsp`	Hint	Reports a hint	Stippled underlines

When the region of the diagnostic spans more than one line, the diagnostic is always drawn as a box.

Diagnostics will also optionally include the following scopes:

scope	diagnostic tag name	description
`markup.unnecessary.lsp`	Unnecessary	Unused or unnecessary code
`markup.deprecated.lsp`	Deprecated	Deprecated or obsolete code

Those scopes can be used to, for example, gray out the text color of unused code, if the server supports that.

For example, to add a custom rule for Mariana color scheme, select UI: Customize Color Scheme from the Command Palette and add the following rule:

{
    "rules": [
        {
            "scope": "markup.unnecessary.lsp",
            "foreground": "color(rgb(255, 255, 255) alpha(0.4))",
            "background": "#00000101"
        }
    ]
}

The color scheme rule only works if the "background" color is (marginally) different from the original color scheme background.

Signature Help#

scope	description
`entity.name.function.sighelp.lsp`	Function name in the signature help popup
`variable.parameter.sighelp.lsp`	Function argument in the signature help popup
`variable.parameter.sighelp.active.lsp`	Function argument which is currently highlighted in the signature help popup

Note

If there is no special rule for the active parameter in the color scheme, it will be rendered with bold and underlined font style. But if the color scheme defines a different "foreground" color for the active parameter, the style follows the "font_style" property from the color scheme rule.

Annotations#

scope	description
`markup.accent.codelens.lsp`	Accent color for code lens annotations
`markup.accent.codeaction.lsp`	Accent color for code action annotations