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emacs
Fangrui Song
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ff65a79325
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866b59d634
83
Emacs.md
83
Emacs.md
@ -1,8 +1,9 @@
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1. See [[Getting started]] to build the `ccls` executable
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2. Install [lsp-mode](https://github.com/emacs-lsp/lsp-mode)
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3. Install [emacs-ccls](https://github.com/MaskRay/emacs-ccls) and [configure](#configure) it
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4. Open a source file where either [[.ccls|Getting-started#ccls]] or [[compile_commands.json]] is in the project root (it may work without them, though not recommended)
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5. `M-x lsp-ccls-enable`. Don't invoke `M-x lsp-mode`. `lsp-ccls-enable` will turn on `lsp-mode` for you
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2. Install [lsp-mode](https://github.com/emacs-lsp/lsp-mode) and (optional) [lsp-ui](https://github.com/emacs-lsp/lsp-ui)
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3. (optionally) Install [company-lsp](https://github.com/tigersoldier/company-lsp)
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4. Install [emacs-ccls](https://github.com/MaskRay/emacs-ccls) and [configure](#configure) it
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5. Open a source file where either [[.ccls|Getting-started#ccls]] or [[compile_commands.json]] is in the project root (it may work without them, though not recommended)
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6. `M-x lsp-ccls-enable`. Don't invoke `M-x lsp-mode`. `lsp-ccls-enable` will turn on `lsp-mode` for you
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### Install [emacs-ccls](https://github.com/MaskRay/emacs-ccls)
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@ -15,28 +16,36 @@ The only required configuration is `ccls-executable`. Others have good defaults.
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`xref-find-definitions` (default: `M-.`) / highlighting of the symbol at point / type signature in echo area should work out-of-box. Read on for customization and more features.
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```elisp
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(setq ccls-executable "/path/to/ccls/release/ccls")
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(setq ccls-executable "/path/to/ccls/Release/ccls")
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;; ;; Some Linux distributions have packages that install to /usr/bin/ccls
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;; (setq ccls-executable "/usr/bin/ccls")
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;; ;; Log file
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;; (setq ccls-extra-args '("--log-file=/tmp/cq.log"))
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;; ;; Cache directory, both relative and absolute paths are supported
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;; (setq ccls-cache-dir ".ccls_cached_index")
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;; (setq ccls-cache-dir ".ccls-cache")
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;; ;; Initialization options
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;; (setq ccls-extra-init-params '(:completion (:detailedLabel t)))
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```
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You may leave `ccls-executable` unchanged (default: `ccls`) and create a shell wrapper named `ccls` and put it into your `PATH`:
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A more flexibal way is to leave `ccls-executable` unchanged (default: `ccls`) and create a shell wrapper named `ccls` that is in your `PATH`:
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```zsh
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#!/bin/zsh
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#export CCLS_TRACEME=1 # if you want to debug ccls, stop it right after main() is called
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#export LD_LIBRARY_PATH=~/Dev/llvm/release/lib # if you link against shared library libLLVM.so, not statically
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exec ~/Dev/Util/ccls/release/ccls --log-file=/tmp/ccls.log "$@"
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#export LD_LIBRARY_PATH=~/llvm/release/lib # if you link against shared library libLLVM.so, not statically
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exec ~/ccls/Release/ccls --log-file=/tmp/ccls.log "$@"
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```
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Some common settings to lsp-mode lsp-ui and emacs-ccls:
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* spacemacs `+tools/lsp` and https://github.com/syl20bnr/spacemacs/pull/11242
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* doom-emacs https://github.com/hlissner/doom-emacs/pull/716
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* MaskRay's doom-emacs configuration: <https://github.com/MaskRay/Config/blob/master/home/.config/doom/modules/private/my-cc/config.el>
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#### Projects with subprojects
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For each source file that has turned on `lsp-ccls-enable`, projectile is consulted to locate the project root and the associated lsp-mode workspace. If your project has subprojects, `(projectile-project-root)` may think files in the subproject belong to the child workspace, which is not desired. `touch .ccls-root` in the root directory to override projectile roots.
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When `M-x lsp-ccls-enable` is invoked, projectile is consulted to locate the project root which determines the associated lsp-mode workspace.
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If your project has subprojects, `(projectile-project-root)` may think files in the subproject belong to the child workspace, which is not desired. `touch .ccls-root` in the root directory to override projectile roots.
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If you do not mind files in subprojects are treated as part of the whole project in projectile:
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@ -64,8 +73,6 @@ To turn on ccls for all C/C++ modes:
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;; Also see lsp-project-whitelist lsp-project-blacklist ccls-root-matchers
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```
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MaskRay's doom-emacs configuration: <https://github.com/MaskRay/Config/blob/master/home/.config/doom/modules/private/my-cc/config.el>
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### Diagnostics
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* `M-x lsp-capabilities` LSP workspace is initialized correctly
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@ -99,14 +106,7 @@ There are Helm/Ivy alternatives for `xref-find-{definitions,references,apropos}`
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* [helm-xref](https://github.com/brotzeit/helm-xref)
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* [ivy-xref](https://github.com/alexmurray/ivy-xref)
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Check https://github.com/emacs-lsp/lsp-ui for a supplement of lsp-mode. It provides some higher level UI features.
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`lsp-ui-peek-find-{definitions,references}` from [lsp-ui-peek.el](https://github.com/emacs-lsp/lsp-ui/blob/master/lsp-ui-peek.el) provide peek views. An additional benefit is you get a window local jump list dedicated to cross references which I bind to <kbd>C-p</kbd> and <kbd>C-t</kbd>
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```elisp
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(define-key evil-normal-state-map (kbd "C-p") 'lsp-ui-peek-jump-forward)
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(define-key evil-normal-state-map (kbd "C-t") 'lsp-ui-peek-jump-backward)
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```
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`lsp-ui-peek-find-{definitions,references}` from [lsp-ui-peek.el](https://github.com/emacs-lsp/lsp-ui/blob/master/lsp-ui-peek.el) provide peek views. An additional benefit is you get a window local jump list dedicated to cross references (`lsp-ui-peek-jump-forward` `lsp-ui-peek-jump-backward`)
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@ -114,10 +114,9 @@ Check https://github.com/emacs-lsp/lsp-ui for a supplement of lsp-mode. It provi
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Refer to [MaskRay's doom-emacs configuration](https://github.com/MaskRay/Config/blob/master/home/.config/doom/modules/private/my-cc/autoload.el) for fine-grained `textDocument/references` (different roles: Read/Write/Dynamic/...)
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### Symbol highlight
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The identifier (or user-defined operator) at point is highlighted with its other references. If you build trunk libclang, the references will be differentiated for different usage: read/write.
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### documentHighlight
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The identifier (or user-defined operator) at point is highlighted with its other references. You may customize `lsp-face-highlight-*`.
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### imenu/workspace symbol search
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@ -134,15 +133,19 @@ For a symbol named `Name::FooBar`, all of `FooBar`, `foo bar`, `nafoba` find the
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Aside from definitions/references/workspace symbol, ccls provides some LSP extensions that find base/derived classes/methods, vars of a type, callers of a function. You may call:
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```elisp
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(ccls-xref-find-custom "$ccls/base")
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(ccls-xref-find-custom "$ccls/callers")
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(lsp-find-custom "$ccls/base")
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(lsp-find-custom "$ccls/callers")
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; Use lsp-goto-implementation or lsp-ui-peek-find-implementation for derived types/functions
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(ccls-xref-find-custom "$ccls/vars")
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(lsp-find-custom "$ccls/vars")
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;; Alternatively, use lsp-ui-peek interface
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(lsp-ui-peek-find-custom 'base "$ccls/base")
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(lsp-ui-peek-find-custom 'callers "$ccls/callers")
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(lsp-ui-peek-find-custom 'random "$ccls/random") ;; jump to a random declaration
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(defun ccls/vars (kind) (lsp-ui-peek-find-custom 'vars "$ccls/vars" (plist-put (lsp--text-document-position-params) :kind kind)))
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(ccls/vars 3) ;; field or local variable
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(ccls/vars 1) ;; field
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(ccls/vars 4) ;; parameter
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```
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There are flattened versions of hierarchies with `:flat t`:
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@ -158,6 +161,23 @@ There are flattened versions of hierarchies with `:flat t`:
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(append (lsp--text-document-position-params) '(:flat t :level 3 :derived t))))
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```
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Hierarchies provide a flattened xref interface:
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```elisp
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(defun ccls/bases ()
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(interactive)
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(lsp-ui-peek-find-custom 'base "$ccls/inheritanceHierarchy"
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(append (lsp--text-document-position-params) '(:flat t :level 3))))
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(defun ccls/derived ()
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(interactive)
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(lsp-ui-peek-find-custom 'derived "$ccls/inheritanceHierarchy"
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(append (lsp--text-document-position-params) '(:flat t :level 3 :derived t))))
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(defun ccls/members ()
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(interactive)
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(lsp-ui-peek-find-custom 'base "$ccls/memberHierarchy"
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(append (lsp--text-document-position-params) '(:flat t))))
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```
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### Documentation (comments)
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lsp-ui-doc.el renders comments in a child frame (Emacs >= 26) or inline (< 26).
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@ -168,11 +188,9 @@ lsp-ui-doc.el renders comments in a child frame (Emacs >= 26) or inline (< 26).
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(setq lsp-ui-sideline-show-symbol nil) ; don't show symbol on the right of info
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```
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Check out [MaskRay's config](https://github.com/MaskRay/Config/blob/master/home/.emacs.d/private/%2Bmy/my-code/packages.el) for some (ab)use, e.g. a hydra for next/prev arbitrary/read/write reference. The `"role"` is highly experimental, and you need a trunk libclang (>= 7.0.0) for the role feature.
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### Completion
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Install [company-lsp](https://github.com/tigersoldier/company-lsp) and add `company-lsp` to `company-backends`. Consider disabling client-side cache and sorting because the server does a better job.
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Add `company-lsp` to `company-backends`. ccls has a fuzzy matching algorithm to order candidates according to your query. You may want to disable client-side cache and sorting:
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```elisp
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(setq company-transformers nil company-lsp-async t company-lsp-cache-candidates nil)
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@ -180,7 +198,8 @@ Install [company-lsp](https://github.com/tigersoldier/company-lsp) and add `comp
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Type `#i"` (or `#include "`) for quote-style includes and `#i<` (or `#include <`) for system headers.
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See https://github.com/cquery-project/cquery/pull/391#issuecomment-362872732 for an alternative view (contextual parent as detail, signature as label)
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There is an alternative view (irony-mode style):
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```elisp
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(setq ccls-extra-init-params '(:completion (:detailedLabel t)))
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```
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@ -252,6 +271,6 @@ For the long story, refer to the corresponding [emacs-devel thread](https://list
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For out-of-band changes to the files in the workspace that are not made in the LSP client (e.g. git pull), call
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`(ccls-freshen-index)` to rebuild indexes for every file or `(ccls-freshen-index (list "^/tmp/c/"))` to rebuild indexes for files matched by a regex whitelist.
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* A proposal to integrate ccls and lsp-mode into spacemacs: https://github.com/syl20bnr/spacemacs/issues/10134
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* Discussion of symbol hierarchies (member hierarchy, inheritance hierarchy, call hierarchy) https://github.com/emacs-lsp/lsp-ui/issues/73
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* Performance of lsp-ui-flycheck https://github.com/emacs-lsp/lsp-ui/issues/45
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* A proposal to mention ccls in eglot https://github.com/joaotavora/eglot/pull/94
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