225 lines
14 KiB
Org Mode
225 lines
14 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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- [[#navigation-mode][Navigation mode]]
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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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- [[#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 =company-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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* Configuration
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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= =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-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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| =lsp-prefer-flymake= | nil | When non-nil, use flymake. When nil, and =lsp-ui-flycheck= is available, use flycheck. When :none, use neither flymake nor flycheck. |
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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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* 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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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) |
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| ~SPC m = r~ | format region (lsp) |
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|-------------+--------------------------------------------------------------------------------|
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| ~SPC m g t~ | goto type-definition (lsp) |
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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~ == ='peek=/ |
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| ~SPC m g i~ | find implementations (lsp) |
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| ~SPC m g d~ | find definitions (xref/lsp) |
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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~ == ='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 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-shutdown-workspace |
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| ~SPC m b r~ | lsp-restart-workspace |
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| ~SPC m b a~ | execute code action |
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| ~SPC m b d~ | lsp-describe-session |
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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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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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* 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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