331 lines
20 KiB
Org Mode
331 lines
20 KiB
Org Mode
#+TITLE: LSP layer
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#+TAGS: layer|tool
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* Table of Contents :TOC_5_gh:noexport:
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- [[#description][Description]]
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- [[#features][Features:]]
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- [[#configuration][Configuration]]
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- [[#variables][Variables]]
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- [[#code-lens][Code Lens]]
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- [[#error-statistics-on-modeline][Error statistics on modeline]]
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- [[#code-actions-on-modeline][Code actions on modeline]]
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- [[#navigation-mode][Navigation mode]]
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- [[#breadcrumb-on-headerline][Breadcrumb on headerline]]
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- [[#key-bindings][Key bindings]]
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- [[#key-binding-prefixes][Key binding prefixes]]
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- [[#core-key-bindings][Core key bindings]]
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- [[#language-specific-key-binding-extensions][Language-specific key binding extensions]]
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- [[#spacemacslsp-define-extensions-layer-name-kind-request-optional-extra-parameters][~spacemacs/lsp-define-extensions layer-name kind request &optional extra-parameters~]]
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- [[#spacemacslsp-bind-extensions-for-mode][~spacemacs/lsp-bind-extensions-for-mode~]]
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- [[#dap-integration][DAP integration]]
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- [[#diagnostics][Diagnostics]]
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- [[#references][References]]
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* Description
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This layer adds support for basic language server protocol packages speaking
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[[https://microsoft.github.io/language-server-protocol/specification][language server protocol]].
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Different language servers may support the language server protocol to varying degrees
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and they may also provide extensions; check the language server's website for
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details.
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~M-x lsp-describe-session~ in a LSP buffer to list capabilities of the server.
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** Features:
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- Cross references (definitions, references, document symbol, workspace symbol
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search and others)
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- Workspace-wide symbol rename
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- Symbol highlighting
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- Flycheck
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- Completion with =LSP=
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- Signature help with =eldoc=
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- Symbol documentation in a child frame (=lsp-ui-doc=)
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- Navigation using =imenu=
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- Consistent core key bindings in LSP modes
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- Code folding (=lsp-origami=)
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* Configuration
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Enabling this layer will set the used backend for all supported languages to
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=LSP= unless you explicitly set a specific backend for the language.
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The LSP ecosystem is based on two packages: [[https://github.com/emacs-lsp/lsp-mode][lsp-mode]] and [[https://github.com/emacs-lsp/lsp-ui][lsp-ui]].
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Please check out their documentation.
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If you add =lsp-**-enable= to major mode hooks for auto initialization of
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language clients, customize ~lsp-project-whitelist~ and ~lsp-project-blacklist~ to
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disable projects you don't want to enable LSP.
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** Variables
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A number of configuration variables have been exposed via the LSP layer =config.el=.
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Sensible defaults have been provided, however they may all be overridden in your .spacemacs, or dynamically using the bindings added
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under the derived mode t prefix by =(spacemacs/lsp-bind-keys-for-mode mode)=
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| Variable name | Default | Description |
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|--------------------------------------+--------------------------------------+-----------------------------------------------------------------------------------------------------------------|
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| =lsp-headerline-breadcrumb-enable= | nil | When non-nil, shows breadcrumb on headerline. |
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| =lsp-headerline-breadcrumb-segments= | `'(path-up-to-project file symbols)' | Display the path to the root of project, the name of the current file, and also its symbols. See details below. |
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| =lsp-lens-enable= | nil | When non-nil, shows code lens when it's supported. |
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| =lsp-modeline-diagnostics-enable= | t | When non-nil, shows error diagnostics in modeline. |
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| =lsp-modeline-diagnostics-scope= | `:project' | Displays all error statistcs per projects. See details below. |
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| =lsp-modeline-code-actions-enable= | t | When non-nil, shows available code actions in modeline. |
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| =lsp-modeline-code-actions-segments= | `'(count icon)' | Display the number of available code actions and an icon. See details below. |
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| =lsp-navigation= | `both' | `simple' or `peek' to bind only xref OR lsp-ui-peek navigation functions. |
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| =lsp-ui-remap-xref-keybindings= | nil | When non-nil, xref key bindings remapped to lsp-ui-peek-find-{definition,references}. |
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| =lsp-ui-doc-enable= | t | When non-nil, the documentation overlay is displayed. |
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| =lsp-ui-doc-include-signature= | nil | When nil, signature omitted from lsp-ui-doc overlay (this is usually redundant). |
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| =lsp-ui-sideline-enable= | t | When non-nil, the symbol information overlay is displayed. |
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| =lsp-ui-sideline-show-symbol= | nil | When non-nil, the symbol information overlay includes symbol name (redundant for c-modes). |
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** Code Lens
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Code lens is a feature that displays ="actionable contextual information interspersed"= in your source code.
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In other words, it displays extra information of the source code, and allows you to perform certain actions.
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For example, the LSP server may decorate the entry point of a program, and also provides a quick access for running/debugging the program.
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To always display code lens,
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((lsp :variables lsp-lens-enable nil)))
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#+END_SRC
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This doesn't have any effect when code lens is not supported by current language server.
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** Error statistics on modeline
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By default, all error statistics of a project is displayed in the modeline.
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To disable this feature, set ~lsp-modeline-diagnostics-enable~ to ~nil~.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((lsp :variables lsp-modeline-diagnostics-enable nil)))
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#+END_SRC
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To only display errors for the current file, you can set ~lsp-modeline-diagnostics-scope~ to ~:file~.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((lsp :variables lsp-modeline-diagnostics-scope :file)))
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#+END_SRC
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Alternatively, if you want to see all errors across all projects, you can set it to ~:global~.
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** Code actions on modeline
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By default, available code actions are displayed in modeline. To disable this feature, set ~lsp-modeline-code-actions-enable~ to ~nil~.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((lsp :variables lsp-modeline-code-actions-enable nil)))
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#+END_SRC
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You can also customize its appearance via ~lsp-modeline-code-actions-segments~. Available segments are:
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- ~icon~ shows a lightbulb icon.
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- ~name~ shows the name of the preferred code action.
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- ~count~ shows the how many code actions are available.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((lsp :variables
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;; default segments
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lsp-modeline-code-actions-segments '(count icon))))
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#+END_SRC
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** Navigation mode
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The ~lsp-navigation~ variable defined in =config.el= allows you to define a preference for lightweight or pretty
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(using =lsp-ui-peek=) source navigation styles. By default, the lightweight functions are bound under ~SPC m g~
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and the =lsp-ui-peek= variants under ~SPC m G~. Setting ~lsp-navigation~ to either ~'simple~ or ~'peek~ eliminates
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the bindings under ~SPC m G~ and creates bindings under ~SPC m g~ according to the specified preference.
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** Breadcrumb on headerline
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To display breadcrumb in the headerline, set ~lsp-headerline-breadcrumb-segments~ to ~t~.
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You can customize the breadcrumb segments via ~lsp-headerline-breadcrumb-segments~. Available segments are:
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- ~project~ shows the name of the current project.
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- ~file~ shows the name of the current file.
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- ~path-up-to-project~ shows the path up to the current project.
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- ~symbols~ shows the document symbols.
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For example, to display only the symbols,
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((lsp :variables lsp-headerline-breadcrumb-segments '(symbols))))
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#+END_SRC
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To display the current project, current file, and document symbols,
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers
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'((lsp :variables lsp-headerline-breadcrumb-segments '(project file symbols))))
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#+END_SRC
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* Key bindings
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A number of lsp features useful for all/most modes have been bound to the lsp minor mode, meaning they'll be
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available in all language layers based on the lsp layer.
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** Key binding prefixes
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The key bindings are grouped under the following prefixes:
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| prefix | name | functional area |
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|-----------+---------------+----------------------------------------------------------------------------|
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| ~SPC m =~ | format | Source formatting |
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| ~SPC m g~ | goto | Source navigation |
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| ~SPC m G~ | peek | Source navigation (lsp-ui-peek overlay) |
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| ~SPC m F~ | folder | Add/remove folders from workspace |
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| ~SPC m h~ | help | Help |
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| ~SPC m b~ | lsp/backend | Catchall. Restart LSP backend, other implementation-specific functionality |
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| ~SPC m r~ | refactor | What it says on the tin |
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| ~SPC m T~ | toggle | Toggle LSP backend features (documentation / symbol info overlays etc.) |
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| ~SPC m x~ | text (source) | Text (source) document related bindings |
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Some navigation key bindings (i.e. ~SPC m g~ / ~SPC m G~) use an additional level of grouping:
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| prefix | name | functional area |
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|-----------------+------------------+-----------------------------------------------------------|
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| ~SPC m <g/G> h~ | hierarchy | Hierarchy (i.e. call/inheritance hierarchy etc. ) |
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| ~SPC m <g/G> m~ | member hierarchy | Class/namespace members (functions, nested classes, vars) |
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** Core key bindings
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The lsp minor mode bindings are:
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| binding | function |
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|-------------+----------------------------------------------------------------------------------|
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| ~SPC m = b~ | format buffer (=lsp-mode=) |
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| ~SPC m = r~ | format region (=lsp-mode=) |
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| ~SPC m = o~ | format (organise) imports |
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|-------------+----------------------------------------------------------------------------------|
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| Note | /The ~f~, ~r~ and ~s~ actions are placeholders for imminent =lsp-mode= features/ |
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| ~SPC m a a~ | Execute code action |
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| ~SPC m a f~ | Execute fix action |
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| ~SPC m a r~ | Execute refactor action |
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| ~SPC m a s~ | Execute source action |
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|-------------+----------------------------------------------------------------------------------|
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| ~SPC m g t~ | goto type-definition (=lsp-mode=) |
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| ~SPC m g k~ | goto viewport word (=avy=) (See Note 1) |
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| ~SPC m g K~ | goto viewport symbol (=avy=) (See Note 1) |
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| ~SPC m g e~ | browse flycheck errors (=lsp-treemacs=) |
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| ~SPC m g M~ | browse file symbols (=lsp-ui-imenu=) |
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|-------------+----------------------------------------------------------------------------------|
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| Note | /Replaced by the lsp-ui-peek equivalents when ~lsp-navigation~ is ~'peek~ / |
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| ~SPC m g i~ | find implementations (=lsp-mode=) |
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| ~SPC m g d~ | find definitions (=xref= / =lsp-mode=) |
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| ~SPC m g r~ | find references (=xref= / =lsp=) |
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| ~SPC m g s~ | find symbol in project (=helm-lsp=) |
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| ~SPC m g S~ | find symbol in all projects (=helm-lsp=) |
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| ~SPC m g p~ | goto previous (~xref-pop-marker-stack~) |
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|-------------+----------------------------------------------------------------------------------|
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| Note | /Omitted when ~lsp-navigation~ is ~'peek~ or ~'simple~ / |
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| | /Bound under ~SPC m g~ rather than ~SPC m G~ when ~lsp-navigation~ == ='peek=/ |
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| ~SPC m G i~ | find implementation (=lsp-ui-peek=) |
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| ~SPC m G d~ | find definitions (=lsp-ui-peek=) |
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| ~SPC m G r~ | find references (=lsp-ui-peek=) |
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| ~SPC m G s~ | find workspace symbol (=lsp-ui-peek=) |
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| ~SPC m G S~ | goto workspace symbol (~lsp-treemacs-symbols~) |
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| ~SPC m G p~ | goto previous (=lsp-ui-peek= stack - see Note 2) |
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| ~SPC m G n~ | goto next (=lsp-ui-peek stack= - see Note 2) |
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| ~SPC m G E~ | browse flycheck errors (=lsp-ui=) |
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|-------------+----------------------------------------------------------------------------------|
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| ~SPC m h h~ | describe thing at point |
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|-------------+----------------------------------------------------------------------------------|
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| ~SPC m b s~ | ~lsp-workspace-shutdown~ |
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| ~SPC m b r~ | ~lsp-workspace-restart~ |
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| ~SPC m b d~ | ~lsp-describe-session~ |
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| ~SPC m b v~ | ~lsp-version~ |
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|-------------+----------------------------------------------------------------------------------|
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| ~SPC m r r~ | rename |
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|-------------+----------------------------------------------------------------------------------|
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| ~SPC m T d~ | toggle documentation overlay |
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| ~SPC m T F~ | toggle documentation overlay function signature |
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| ~SPC m T s~ | toggle symbol info overlay |
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| ~SPC m T S~ | toggle symbol info overlay symbol name |
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| ~SPC m T I~ | toggle symbol info overlay duplicates |
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| ~SPC m T l~ | toggle lenses |
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|-------------+----------------------------------------------------------------------------------|
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| ~SPC m F r~ | Remove workspace folder |
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| ~SPC m F a~ | Add workspace folder |
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| ~SPC m F s~ | Switch workspace folder |
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|-------------+----------------------------------------------------------------------------------|
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| ~SPC m x h~ | Highlight all instances of symbol under point |
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| ~SPC m x l~ | Show code lenses |
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| ~SPC m x L~ | Hide code lenses |
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Note 1: Your language server may not distinguish between the word and symbol variants of this binding.
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Note 2: There is a window local jump list dedicated to cross references.
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** Language-specific key binding extensions
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Some LSP server implementations provide extensions to the protocol, which can be leveraged using ~lsp-find-custom~
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or ~lsp-ui-peek-find-custom~. A number of additional functions have been provided to facilitate wrapping these extensions
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in a manner consistent with the ~lsp-navigation~ setting.
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*** ~spacemacs/lsp-define-extensions layer-name kind request &optional extra-parameters~
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Use this to define an extension to the lsp find functions. An example from the c-c++ layer:
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#+BEGIN_SRC elisp
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(spacemacs/lsp-define-extensions "c-c++" 'refs-address
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"textDocument/references"
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'(plist-put (lsp--text-document-position-params) :context '(:role 128)))
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#+END_SRC
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This defines the following interactive functions:
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- ~c-c++/find-refs-address~
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- ~c-c++/peek-refs-address~
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*** ~spacemacs/lsp-bind-extensions-for-mode~
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Use this to bind one or more extensions under ~SPC m g~ and/or ~SPC m G~, as dictated by the value of ~lsp-navigation~.
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Using another example from the c-c++ layer:
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#+BEGIN_SRC elisp
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(spacemacs/lsp-bind-extensions-for-mode mode "c-c++"
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"&" 'refs-address
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"R" 'refs-read
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"W" 'refs-write
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"c" 'callers
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"C" 'callees
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"v" 'vars)
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#+END_SRC
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With ~lsp-navigation~ set to ~'both~ (the default), this is equivalent to:
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#+BEGIN_SRC elisp
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(spacemacs/set-leader-keys-for-major-mode mode
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"g&" 'c-c++/find-refs-address
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"gR" 'c-c++/find-refs-read
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"gW" 'c-c++/find-refs-write
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"gc" 'c-c++/find-callers
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"gC" 'c-c++/find-callees
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"gv" 'c-c++/find-vars
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"G&" 'c-c++/peek-refs-address
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"GR" 'c-c++/peek-refs-read
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"GW" 'c-c++/peek-refs-write
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"Gc" 'c-c++/peek-callers
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"GC" 'c-c++/peek-callees
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"Gv" 'c-c++/peek-vars)
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#+END_SRC
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whereas with ~lsp-navigation~ set to ~'peek~, this is equivalent to:
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#+BEGIN_SRC elisp
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(spacemacs/set-leader-keys-for-major-mode mode
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"g&" 'c-c++/peek-refs-address
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"gR" 'c-c++/peek-refs-read
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"gW" 'c-c++/peek-refs-write
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"gc" 'c-c++/peek-callers
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"gC" 'c-c++/peek-callees
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"gv" 'c-c++/peek-vars)
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#+END_SRC
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etc.
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* DAP integration
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=lsp-mode= integrates with =dap-mode=, which implements DAP(Debugger Adapter Protocol). See documentation on =DAP= layer for details.
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* Diagnostics
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If some features do not work as expected, here is a common check list.
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- ~M-x lsp-describe-session~ If the LSP workspace is initialized correctly
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- ~M-: xref-backend-functions~ should be ~(lsp--xref-backend)~ for cross
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references
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- ~M-: completion-at-point-functions~ should be ~(lsp-completion-at-point)~ for
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completion
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* References
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- [[https://github.com/emacs-lsp/lsp-mode][lsp-mode repo]]
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- [[https://github.com/emacs-lsp/lsp-ui][lsp-ui repo]]
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