💥 Replace feature/jump with feature/lookup
+ Adds Dash docset integration (with helm or ivy support) + Adds devdocs.io integration + Three new settings: :lookup, :devdocs and :docset
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Henrik Lissner
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modules/feature/lookup/README.org
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modules/feature/lookup/README.org
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#+TITLE: :feature lookup
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Integrates with code navigation and documentation tools to help you quickly look
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up definitions, references and documentation.
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+ Integration with devdocs.io
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+ Integration with Dash.app docsets.
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+ Jump-to-definition and find-references implementations that just work.
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+ Powerful xref integration for languages that support it.
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* Table of Contents :TOC:
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- [[#install][Install]]
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- [[#module-flags][Module flags]]
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- [[#dependencies][Dependencies]]
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- [[#usage][Usage]]
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- [[#jump-to-definition][Jump to definition]]
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- [[#find-references][Find references]]
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- [[#look-up-documentation][Look up documentation]]
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- [[#search-a-specific-documentation-backend][Search a specific documentation backend]]
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- [[#configuration][Configuration]]
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- [[#settings][Settings]]
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- [[#open-in-eww-instead-of-browser][Open in eww instead of browser]]
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- [[#appendix][Appendix]]
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- [[#commands][Commands]]
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* Install
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To enable the module add =:feature lookup= to your ~doom!~ block in
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=~/.emacs.d/init.el=.
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** Module flags
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This module provides two flags:
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+ ~+docsets~ Enables integration with Dash docsets.
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+ ~+devdocs~ Enables integration with devdocs.io search.
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** Dependencies
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This module has several soft dependencies:
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+ ~the_silver_searcher~ and/or ~ripgrep~ as a last-resort fallback for
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jump-to-definition/find-references.
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+ ~sqlite3~ for Dash docset support.
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*** MacOS
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#+BEGIN_SRC sh :tangle (if (doom-system-os 'macos) "yes")
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brew install the_silver_searcher ripgrep
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# An older version of sqlite is included in MacOS. If it causes you problems (and
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# it has been reported that it will), install it through homebrew:
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brew install sqlite
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# Note that it's keg-only, meaning it isn't symlinked to /usr/local/bin. You'll
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# have to add it to PATH yourself (or symlink it into your PATH somewhere). e.g.
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export PATH="/usr/local/opt/sqlite/bin:$PATH"
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#+END_SRC
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*** Arch Linux
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#+BEGIN_SRC sh :dir /sudo:: :tangle (if (doom-system-os 'arch) "yes")
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sudo pacman --needed --noconfirm -S sqlite the_silver_searcher ripgrep
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#+END_SRC
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* Usage
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** Jump to definition
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Use ~+lookup/definition~ (bound to =gd= in normal mode) to jump to the
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definition of the symbol at point
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This module provides a goto-definition implementation that will try the
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following sources before giving up:
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1. Whatever ~:definition~ function is registered for the current buffer with the
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~:lookup~ setting (see "Configuration" section).
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2. Any available xref backends.
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3. ~dumb-jump~ (a text search with aides to reduce false positives).
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3. An ordinary project-wide text search with ripgrep or the_silver_searcher.
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5. If ~evil-mode~ is active, use ~evil-goto-definition~, which preforms a simple
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text search within the current buffer.
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If there are multiple results, you will be prompted to select one.
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** Find references
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Use ~+lookup/references~ (bound to =gD= in normal mode) to see a list of
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references for the symbol at point from throughout your project.
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Like ~+lookup/definition~, this tries a number of sources before giving up. It
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will try:
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1. Whatever ~:references~ function is registered for the current buffer with the
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~:lookup~ setting (see "Configuration" section).
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2. Any available xref backends.
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3. An ordinary project-wide text search with ripgrep or the_silver_searcher.
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If there are multiple results, you will be prompted to select one.
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** Look up documentation
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~+lookup/documentation~ (bound to =gh= in normal mode) will open documentation
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for the symbol at point.
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Depending on your configuration, this will try a list of sources:
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1. Whatever ~:documentation~ function is registered for the current buffer with
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the ~:lookup~ setting (see "Configuration" section).
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2. Any Dash.app docsets, if any are installed for the current major mode.
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3. devdocs.io, if it has a docset for the current mode.
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4. An online search; using the last engine used (it will prompt you the first
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time, or if ~current-prefix-arg~ is non-nil).
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** Search a specific documentation backend
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You can perform a documentation lookup on any backends directly:
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+ Dash Docsets: ~+lookup/in-docsets~, or ~:dash QUERY~ for evil users.
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+ devdocs.io: ~+lookup/in-devdocs~, or ~:dd QUERY~ for evil users.
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+ Online (generic): ~+lookup/online~ or ~+lookup/online-select~ (bound to =SPC /
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o=), or ~:lo[okup] QUERY~ for evil users.
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* Configuration
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** Settings
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This module provides three settings: ~:lookup~, ~:docset~ and ~:devdocs~.
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*** ~:lookup MODES &rest PLIST~
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Defines a lookup target for major MODES (one major-mode symbol or a list
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thereof). PLIST accepts the following optional properties:
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+ ~:definition FN~ :: Run when jumping to a symbol's definition. Used by
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~+lookup/definition~.
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+ ~:references FN~ :: Run when looking for usage references of a symbol in the
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current project. Used by ~+lookup/references~.
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+ ~:documentation FN~ :: Run when looking up documentation for a symbol. Used by
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~+lookup/documentation~.
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+ ~:xref-backend FN~ :: Defines an xref backend for a major-mode. With this,
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:definition and :references are unnecessary.
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**** Example
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#+BEGIN_SRC emacs-lisp
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;; For python-mode, anaconda-mode offers a backend for all three lookup
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;; functions. We can register them like so:
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(set! :lookup 'python-mode
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:definition #'anaconda-mode-find-definitions
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:references #'anaconda-mode-find-references
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:documentation #'anaconda-mode-show-doc)
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;; If a language or plugin provides a custom xref backend available for it, use
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;; that instead. It will provide the best jump-to-definition and find-references
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;; experience. You can specify custom xref backends with:
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(set! :lookup 'js2-mode :xref-backend #'xref-js2-xref-backend)
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;; NOTE: xref doesn't provide a :documentation backend.
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#+END_SRC
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*** ~:docset MODES &rest DOCSETS~
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Registers a list of DOCSETS (strings) for MODES (either one major mode symbol or
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a list of them). Used by ~+lookup/in-docsets~ and ~+lookup/documentation~.
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#+BEGIN_SRC emacs-lisp
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(set! :docset 'js2-mode "JavaScript" "JQuery")
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;; Add docsets to minor modes by starting DOCSETS with :add
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(set! :docset 'rjsx-mode :add "React")
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;; Or remove docsets from minor modes
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(set! :docset 'nodejs-mode :remove "JQuery")
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#+END_SRC
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*** ~:devdocs MODES DOCSET~
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Registers a devdocs DOCset (one string) to search when in MODES (either one
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major mode symbol or a list). Used by ~+lookup/in-devdocs~ and
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~+lookup/documentation~. With devdocs you can only search one docset at a time.
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#+BEGIN_SRC emacs-lisp
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(set! :devdocs 'js2-mode "javascript")
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;; works on minor modes too
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(set! :devdocs 'rjsx-mode "react")
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#+END_SRC
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** Open in eww instead of browser
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#+BEGIN_SRC emacs-lisp
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(setq +lookup-open-url-fn 'eww)
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#+END_SRC
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* Appendix
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** Commands
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+ ~+lookup/definition~
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+ ~+lookup/references~
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+ ~+lookup/documentation~
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+ ~+lookup/online~
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+ ~+lookup/online-select~
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+ ~+lookup/in-devdocs~
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+ ~+lookup/in-docsets~
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