Lucien Cartier-Tilet
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311 lines
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Org Mode
311 lines
12 KiB
Org Mode
#+title: Emacs — Packages — Autocompletion
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#+setupfile: ../../headers
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#+property: header-args:emacs-lisp :mkdirp yes :lexical t :exports code
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#+property: header-args:emacs-lisp+ :tangle ~/.config/emacs/lisp/autocompletion.el
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#+property: header-args:emacs-lisp+ :mkdirp yes :noweb no-export
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* Autocompletion
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** Code Autocompletion
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Company is, in my opinion, the best autocompleting engine for Emacs,
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and it is one of the most popular if not /the/ most popular.
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#+begin_src emacs-lisp
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(use-package company
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:straight (:build t)
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:defer t
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:hook (company-mode . evil-normalize-keymaps)
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:init (global-company-mode)
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:config
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(setq company-minimum-prefix-length 2
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company-toolsip-limit 14
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company-tooltip-align-annotations t
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company-require-match 'never
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company-global-modes '(not erc-mode message-mode help-mode gud-mode)
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company-frontends
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'(company-pseudo-tooltip-frontend ; always show candidates in overlay tooltip
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company-echo-metadata-frontend) ; show selected candidate docs in echo area
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company-backends '(company-capf)
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company-auto-commit nil
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company-auto-complete-chars nil
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company-dabbrev-other-buffers nil
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company-dabbrev-ignore-case nil
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company-dabbrev-downcase nil))
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#+end_src
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This package is a backend for company. It emulates
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~ac-source-dictionary~ by proposing text related to the current
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major-mode.
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#+begin_src emacs-lisp
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(use-package company-dict
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:after company
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:straight (:build t)
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:config
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(setq company-dict-dir (expand-file-name "dicts" user-emacs-directory)))
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#+end_src
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On the other hand, ~company-box~ is a Company front-end which offers
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colours, icons, documentation and so on. Very nice.
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Declaring all the icons for the variable
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~company-box-icons-all-the-icons~ is quite verbose in Elisp, so I do it
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with an org-table.
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#+name: company-box-icons
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| Type | Icon | Color |
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|---------------+--------------------------+--------|
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| Unknown | find_in_page | purple |
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| Text | text_fields | green |
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| Method | functions | red |
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| Function | functions | red |
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| Constructor | functions | red |
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| Field | functions | red |
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| Variable | adjust | blue |
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| Class | class | red |
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| Interface | settings_input_component | red |
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| Module | view_module | red |
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| Property | settings | red |
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| Unit | straighten | red |
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| Value | filter_1 | red |
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| Enum | plus_one | red |
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| Keyword | filter_center_focus | red |
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| Snippet | short_text | red |
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| Color | color_lens | red |
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| File | insert_drive_file | red |
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| Reference | collections_bookmark | red |
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| Folder | folder | red |
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| EnumMember | people | red |
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| Constant | pause_circle_filled | red |
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| Struct | streetview | red |
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| Event | event | red |
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| Operator | control_point | red |
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| TypeParameter | class | red |
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| Template | short_text | green |
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| ElispFunction | functions | red |
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| ElispVariable | check_circle | blue |
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| ElispFeature | stars | orange |
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| ElispFace | format_paint | pink |
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#+name: gen-company-box-icons
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#+headers: :tangle no :noweb yes :exports none :cache yes
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#+header: :wrap "src emacs-lisp :exports none :tangle no"
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#+begin_src emacs-lisp :var table=company-box-icons
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(mapconcat (lambda (row)
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(format "(%s . ,(all-the-icons-material \"%s\" :face 'all-the-icons-%s))"
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(car row)
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(cadr row)
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(caddr row)))
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table
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"\n")
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#+end_src
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#+RESULTS[8ebf4bb3f7f354571a5d42cf58f8b9ba847ba028]: gen-company-box-icons
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#+begin_src emacs-lisp :exports none :tangle no
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(Unknown . ,(all-the-icons-material "find_in_page" :face 'all-the-icons-purple))
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(Text . ,(all-the-icons-material "text_fields" :face 'all-the-icons-green))
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(Method . ,(all-the-icons-material "functions" :face 'all-the-icons-red))
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(Function . ,(all-the-icons-material "functions" :face 'all-the-icons-red))
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(Constructor . ,(all-the-icons-material "functions" :face 'all-the-icons-red))
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(Field . ,(all-the-icons-material "functions" :face 'all-the-icons-red))
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(Variable . ,(all-the-icons-material "adjust" :face 'all-the-icons-blue))
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(Class . ,(all-the-icons-material "class" :face 'all-the-icons-red))
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(Interface . ,(all-the-icons-material "settings_input_component" :face 'all-the-icons-red))
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(Module . ,(all-the-icons-material "view_module" :face 'all-the-icons-red))
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(Property . ,(all-the-icons-material "settings" :face 'all-the-icons-red))
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(Unit . ,(all-the-icons-material "straighten" :face 'all-the-icons-red))
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(Value . ,(all-the-icons-material "filter_1" :face 'all-the-icons-red))
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(Enum . ,(all-the-icons-material "plus_one" :face 'all-the-icons-red))
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(Keyword . ,(all-the-icons-material "filter_center_focus" :face 'all-the-icons-red))
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(Snippet . ,(all-the-icons-material "short_text" :face 'all-the-icons-red))
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(Color . ,(all-the-icons-material "color_lens" :face 'all-the-icons-red))
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(File . ,(all-the-icons-material "insert_drive_file" :face 'all-the-icons-red))
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(Reference . ,(all-the-icons-material "collections_bookmark" :face 'all-the-icons-red))
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(Folder . ,(all-the-icons-material "folder" :face 'all-the-icons-red))
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(EnumMember . ,(all-the-icons-material "people" :face 'all-the-icons-red))
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(Constant . ,(all-the-icons-material "pause_circle_filled" :face 'all-the-icons-red))
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(Struct . ,(all-the-icons-material "streetview" :face 'all-the-icons-red))
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(Event . ,(all-the-icons-material "event" :face 'all-the-icons-red))
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(Operator . ,(all-the-icons-material "control_point" :face 'all-the-icons-red))
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(TypeParameter . ,(all-the-icons-material "class" :face 'all-the-icons-red))
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(Template . ,(all-the-icons-material "short_text" :face 'all-the-icons-green))
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(ElispFunction . ,(all-the-icons-material "functions" :face 'all-the-icons-red))
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(ElispVariable . ,(all-the-icons-material "check_circle" :face 'all-the-icons-blue))
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(ElispFeature . ,(all-the-icons-material "stars" :face 'all-the-icons-orange))
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(ElispFace . ,(all-the-icons-material "format_paint" :face 'all-the-icons-pink))
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#+end_src
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#+begin_src emacs-lisp
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(use-package company-box
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:straight (:build t)
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:after (company all-the-icons)
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:config
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(setq company-box-show-single-candidate t
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company-box-backends-colors nil
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company-box-max-candidates 50
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company-box-icons-alist 'company-box-icons-all-the-icons
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company-box-icons-all-the-icons
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(let ((all-the-icons-scale-factor 0.8))
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`(
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<<gen-company-box-icons()>>))))
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#+end_src
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** Ivy
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My main menu package is =ivy= which I use as much as possible –I’ve
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noticed =helm= can be slow, very slow in comparison to =ivy=, so I’ll use
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the latter as much as possible. Actually, only =ivy= is installed for
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now. I could have used =ido= too, but I find it to be a bit too
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restricted in terms of features compared to =ivy=.
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#+begin_src emacs-lisp
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(use-package ivy
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:straight t
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:defer t
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:diminish
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:bind (("C-s" . swiper)
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:map ivy-minibuffer-map
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("TAB" . ivy-alt-done)
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("C-l" . ivy-alt-done)
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("C-t" . ivy-next-line)
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("C-s" . ivy-previous-line)
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("C-u" . ivy-scroll-up-command)
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("C-d" . ivy-scroll-down-command)
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:map ivy-switch-buffer-map
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("C-t" . ivy-next-line)
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("C-s" . ivy-previous-line)
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("C-l" . ivy-done)
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("C-d" . ivy-switch-buffer-kill)
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:map ivy-reverse-i-search-map
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("C-t" . ivy-next-line)
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("C-s" . ivy-previous-line)
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("C-d" . ivy-reverse-i-search-kill))
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:config
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(ivy-mode 1)
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(setq ivy-wrap t
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ivy-height 17
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ivy-sort-max-size 50000
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ivy-fixed-height-minibuffer t
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ivy-read-action-functions #'ivy-hydra-read-action
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ivy-read-action-format-function #'ivy-read-action-format-columns
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projectile-completion-system 'ivy
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ivy-on-del-error-function #'ignore
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ivy-use-selectable-prompt t))
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#+end_src
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There is also [[https://github.com/raxod502/prescient.el][~prescient.el~]] that offers some nice features when
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coupled with ~ivy~, guess what was born out of it? ~ivy-prescient~, of
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course!
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#+begin_src emacs-lisp
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(use-package ivy-prescient
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:after ivy
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:straight (:build t))
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#+end_src
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I warned you I’d use too much ~all-the-icons~, I did!
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#+begin_src emacs-lisp
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(use-package all-the-icons-ivy
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:straight (:build t)
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:after (ivy all-the-icons)
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:init (all-the-icons-ivy-setup)
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:hook (after-init . all-the-icons-ivy-setup))
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(all-the-icons-ivy-setup)
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#+end_src
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A buffer popping at the bottom of the screen is nice and all, but have
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you considered a floating buffer in the centre of your frame?
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#+begin_src emacs-lisp
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(use-package ivy-posframe
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:defer t
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:after (:any ivy helpful)
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:hook (ivy-mode . ivy-posframe-mode)
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:straight (:build t)
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:init
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(ivy-posframe-mode 1)
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:config
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(setq ivy-fixed-height-minibuffer nil
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ivy-posframe-border-width 10
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ivy-posframe-parameters
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`((min-width . 90)
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(min-height . ,ivy-height))))
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#+end_src
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Something that can be missing sometimes in Ivy is the ability to
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select multiple entries at once. For instance, when programming in
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Java, LPS can offer you to automatically generate the methods ~equals~
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and ~hashCode~ based on selected members, but with vanilla Ivy, you can
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only select one. Not really useful. ~ivy-hydra~ is a package that offers
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a Hydra interface when in Ivy which allows you to select multiple
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choices among other things.
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#+begin_src emacs-lisp
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(use-package ivy-hydra
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:requires (ivy hydra)
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:after ivy
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:straight (:build t))
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#+end_src
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Finally, let’s make ~ivy~ richer:
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#+begin_src emacs-lisp
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(use-package ivy-rich
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:straight (:build t)
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:after ivy
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:init
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(ivy-rich-mode 1))
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#+end_src
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** Counsel
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I could almost merge this chapter with the previous one since counsel
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is a package that provides loads of completion functions for ivy. The
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ones I find most useful are ~counsel-M-x~ and ~counsel-find-file~.
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#+begin_src emacs-lisp
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(use-package counsel
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:straight t
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:after recentf
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:after ivy
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:bind (("M-x" . counsel-M-x)
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("C-x b" . counsel-ibuffer)
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("C-x C-f" . counsel-find-file)
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:map minibuffer-local-map
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("C-r" . 'counsel-minibuffer-history)))
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#+end_src
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** Yasnippet
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Yasnippet allows you to insert some pre-made code by just typing a few
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characters. It can even generate some string with Elisp expressions
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and ask the user for some input in some precise places.
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#+begin_src emacs-lisp
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(use-package yasnippet
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:defer t
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:straight (:build t)
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:init
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(yas-global-mode)
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:hook ((prog-mode . yas-minor-mode)
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(text-mode . yas-minor-mode)))
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#+end_src
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Of course, yasnippet wouldn’t be as awesome as it is without pre-made
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snippets.
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#+begin_src emacs-lisp
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(use-package yasnippet-snippets
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:defer t
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:after yasnippet
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:straight (:build t))
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#+end_src
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Similarly, yatemplate offers pre-made files rather than just strings.
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That’s still yasnippet by the way.
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#+begin_src emacs-lisp
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(use-package yatemplate
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:defer t
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:after yasnippet
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:straight (:build t))
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#+end_src
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And finally, with ivy you can choose your snippets from a menu if
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you’re not sure or if you don’t remember what your snippet is.
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#+begin_src emacs-lisp
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(use-package ivy-yasnippet
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:defer t
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:after (ivy yasnippet)
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:straight (:build t)
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:general
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(phundrak/leader-key
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:infix "i"
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:packages 'ivy-yasnippet
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"y" #'ivy-yasnippet))
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#+end_src
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