282 lines
13 KiB
Org Mode
282 lines
13 KiB
Org Mode
#+title: Start Screen
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#+author: Howard Abrams
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#+date: 2022-11-02
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#+tags: emacs
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A literate programming file for configuring Emacs to show a startup screen.
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#+begin_src emacs-lisp :exports none
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;;; ha-dashboard --- show a startup screen. -*- lexical-binding: t; -*-
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;;
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;; © 2022-2023 Howard Abrams
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;; Licensed under a Creative Commons Attribution 4.0 International License.
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;; See http://creativecommons.org/licenses/by/4.0/
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;;
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;; Author: Howard Abrams <http://gitlab.com/howardabrams>
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;; Maintainer: Howard Abrams
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;; Created: November 2, 2022
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;;
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;; While obvious, GNU Emacs does not include this file or project.
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;;
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;; *NB:* Do not edit this file. Instead, edit the original literate file at:
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;; /Users/howard/other/hamacs/ha-dashboard.org
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;; And tangle the file to recreate this one.
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;;
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;;; Code:
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#+end_src
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* Left Side
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** Dad Jokes!
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The /critical part/ of my dashboard, is the [[https://icanhazdadjoke.com/][Dad Joke]] function, a =curl= call to a web service:
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#+begin_src sh
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curl -sH "Accept: text/plain" https://icanhazdadjoke.com/
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#+end_src
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For this, I use the [[https://github.com/tkf/emacs-request][request]] package (and I’ll use this elsewhere too) and the =dashboard= project (defined below) will incorporate it:
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#+begin_src emacs-lisp
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(use-package request
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:init
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(defvar ha-dad-joke nil "Holds the latest dad joke.")
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:config
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(defun ha-dad-joke ()
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"Display a random dad joke."
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(interactive)
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(message (ha--dad-joke)))
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(defun ha--dad-joke ()
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"Return string containing a dad joke from www.icanhazdadjoke.com."
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(setq ha-dad-joke nil) ; Clear out old joke
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(ha--dad-joke-request)
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(ha--dad-joke-wait))
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(defun ha--dad-joke-wait ()
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(while (not ha-dad-joke)
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(sit-for 1))
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(unless ha-dad-joke
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(ha--dad-joke-wait))
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ha-dad-joke)
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(defun ha--dad-joke-request ()
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(request "https://icanhazdadjoke.com"
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:sync t
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:complete (cl-function
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(lambda (&key data &allow-other-keys)
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(setq ha-dad-joke data))))))
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#+end_src
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** Features
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I would appreciate seeing if my Emacs installation has the features that I expect:
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#+begin_src emacs-lisp
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(defun ha-hamacs-features (&optional non-iconic)
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"Simple display of features I'm most keen about.
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If NON-ICONIC is non-nil, return a string of text only."
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(interactive)
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(defun feature-combo (icon title)
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(if (or non-iconic (null icon))
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title
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(format "%s—%s" icon title)))
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(defun all-images ()
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(s-join "·"
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(-remove 'null
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(list
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(when (image-type-available-p 'gif) "GIF")
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(when (image-type-available-p 'svg) "SVG")
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(when (image-type-available-p 'jpeg) "JPG")
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(when (image-type-available-p 'tiff) "TIFF")
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(when (image-type-available-p 'webp) "WEBP")
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(when (image-type-available-p 'png) "PNG")))))
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(let* ((features
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(list (when (and (fboundp 'native-comp-available-p)
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(native-comp-available-p))
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(feature-combo (all-the-icons-faicon "cog") "Native Compilation"))
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(when (eq (window-system) 'ns)
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(feature-combo (all-the-icons-faicon "apple") "MacOS"))
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(when (eq (window-system) 'pgtk)
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(feature-combo (all-the-icons-faicon "xing") "Gnome"))
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(when (treesit-available-p)
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(feature-combo (all-the-icons-faicon "tree") "Tree Sitter"))
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(when (sqlite-available-p)
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(feature-combo (all-the-icons-faicon "database") "Sqlite"))
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(when (gnutls-available-p)
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(feature-combo (all-the-icons-faicon "expeditedssl") "TLS"))
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(when (or (string-search "with-mailutils" system-configuration-options)
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(string-search "without-pop" system-configuration-options))
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(feature-combo (all-the-icons-material "mail") "GNU Mail"))
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(when (fboundp 'make-xwidget)
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(feature-combo (all-the-icons-material "widgets") "XWidgets"))
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(when module-file-suffix ; or (fboundp 'module-load)
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(feature-combo (all-the-icons-faicon "th") "Modules"))
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(when (json-available-p)
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(feature-combo (all-the-icons-fileicon "config-js") "JSON"))
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(when (string-search "HARFBUZZ" system-configuration-features)
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(feature-combo (all-the-icons-faicon "font") "HARFBUZZ"))
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(when (string-search "DBUS" system-configuration-features)
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(feature-combo (all-the-icons-faicon "bus") "DBUS"))
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(feature-combo (all-the-icons-faicon "picture-o") (all-images))
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(when (fboundp 'imagemagick-types)
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(feature-combo (all-the-icons-faicon "magic") "ImageMagick"))))
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(results (s-join " " (-remove 'null features))))
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(if (called-interactively-p)
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(message "Enabled features: %s" results)
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results)))
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#+end_src
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** Dashboard
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The [[https://github.com/emacs-dashboard/emacs-dashboard][emacs-dashboard]] project makes a nicer startup screen.
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#+begin_src emacs-lisp
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(use-package dashboard
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:init
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(defun ha-dashboard-version ()
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(let ((smaller-version (replace-regexp-in-string
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(rx " (" (zero-or-more any) eol) "" (emacs-version))))
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(string-replace "\n" "" smaller-version)))
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(setq dashboard-banner-logo-title
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(format "Emacs %s — %s"
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(if (and (fboundp 'native-comp-available-p)
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(native-comp-available-p))
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"with Native Compilation" "")
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(ha-dashboard-version))
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dashboard-startup-banner "~/other/hamacs/support/levitating-gnu.png"
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dashboard-center-content t
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dashboard-set-init-info t
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dashboard-projects-switch-function 'project-switch-project
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dashboard-items '(;; (projects . 5)
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;; (agenda . 5)
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;; (bookmarks . 5)
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)
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dashboard-set-heading-icons t
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dashboard-footer-messages (list (ha--dad-joke)))
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:config
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(dashboard-setup-startup-hook)
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;; Real shame that :config is incompatible with :hook, otherwise:
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;; :hook (dashboard-after-initialize . ha-dashboard)
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(add-hook 'dashboard-after-initialize-hook 'ha-dashboard))
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#+end_src
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This dashboard project requires [[https://github.com/purcell/page-break-lines][page-break-lines]] (which is a nice project):
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#+begin_src emacs-lisp
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(use-package page-break-lines)
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#+end_src
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* Right Side
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On the right side should show a list of keybindings or other hints that I want to work on memorizing.
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** Cheatsheet
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Lots of things to learn and keep straight. Let’s try the [[https://github.com/mykyta-shyrin/cheatsheet][cheatsheet.el]] project.
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#+begin_src emacs-lisp
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(use-package cheatsheet
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:config
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(cheatsheet-add-group 'Text-Objects
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'(:key "w" :description "word")
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'(:key "s" :description "sentence")
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'(:key "p" :description "paragraph")
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'(:key "l" :description "line / list")
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'(:key "o" :description "symbol")
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'(:key "a" :description "argument")
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'(:key "x" :description "s-exp")
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'(:key "'" :description "string")
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'(:key "d" :description "function")
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'(:key "f" :description "function ... tree-sitter")
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'(:key "b" :description "loop ... tree-sitter")
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'(:key "u" :description "condition ... tree-sitter")
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'(:key "j" :description "smaller indent block")
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'(:key "k" :description "larger indent block")
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'(:key "i" :description "indented block")
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'(:key "c" :description "comment"))
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(cheatsheet-add-group 'Symbols
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'(:key "(" :description "h d ... jump start s-expression")
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'(:key ")" :description "h f ... jump to end s-expression")
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'(:key "{" :description "h e ... forward expression")
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'(:key "}" :description "h r ... backward expression")
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'(:key "[" :description "h c ... backward expression")
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'(:key "]" :description "h v ... forward expression")
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'(:key "@" :description "h w ... play macro")
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'(:key "!" :description "h q ... shell command")
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'(:key "#" :description "h a ... reverse search (not `n')")
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'(:key "^" :description "h x ... start of line")
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'(:key "$" :description "h s ... end of line")
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'(:key "%" :description "h z ... jump paren start/end")
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'(:key "~" :description "h b ... change case")
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'(:key "`" :description "h g ... jump to mark. See `m'")
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'(:key "|" :description "h t ... goto column. Number prefix")
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)
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(cheatsheet-add-group 'G
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'(:key "g ;" :description "goto last change")
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'(:key "g ," :description "return from last change")
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'(:key "g ." :description "goto definition")
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'(:key "g >" :description "goto definition other window")
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'(:key "g ," :description "return definition stack")
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'(:key "g <" :description "go forward (like definition)")
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'(:key "g /" :description "find references")
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'(:key "g ?" :description "find references and replace")
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'(:key "g h" :description "find apropos with LSP")
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'(:key "g d" :description "goto definition ... g b to go back")
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'(:key "g w" :description "fill to object, g q to fill and move")
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'(:key "g c" :description "comment line")
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'(:key "g e" :description "go backward word end")
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'(:key "g s" :description "visual search for line")
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'(:key "g r" :description "visual search/replace")))
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#+end_src
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** Learn This
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Simple function to display a file in the top-right corner (if the file exists):
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#+begin_src emacs-lisp
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(defun ha-show-learn-this ()
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""
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(interactive)
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(let ((filename "~/other/hamacs/learn-this.org")
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(curr-win (get-buffer-window (buffer-name))))
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(when (file-exists-p filename)
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(split-window-below 15)
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(select-window curr-win)
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(find-file filename))))
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#+end_src
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* Altogether
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The =dashboard= project hooks to [[help:emacs-startup-hook][emacs-startup-hook]] and this =ha-dashboard= function hooks to dashboard’s [[help:dashboard-after-initialize-hook][dashboard-after-initialize-hook]]:
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#+begin_src emacs-lisp
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(defun ha-dashboard ()
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"Shows the extra stuff with the dashboard."
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(interactive)
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(switch-to-buffer "*dashboard*")
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(delete-other-windows)
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(split-window-horizontally)
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(other-window 1)
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(switch-to-buffer "*cheatsheet*")
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(ignore-errors
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(cheatsheet-mode)
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(erase-buffer)
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(insert (cheatsheet--format))
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(setq buffer-read-only t))
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;; (shrink-window-horizontally (- (window-size nil t) 50))
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(shrink-window-horizontally 40)
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(goto-char (point-min))
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(add-hook 'after-init (lambda ()
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(call-interactively 'ha-hamacs-features))))
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#+end_src
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* Technical Artifacts :noexport:
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Let's =provide= a name so we can =require= this file:
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#+begin_src emacs-lisp :exports none
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(provide 'ha-dashboard)
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;;; ha-dashboard.el ends here
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#+end_src
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#+description: configuring Emacs to show a startup screen.
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#+property: header-args:sh :tangle no
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#+property: header-args:emacs-lisp :tangle yes
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#+property: header-args :results none :eval no-export :comments no mkdirp yes
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#+options: num:nil toc:t todo:nil tasks:nil tags:nil date:nil
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#+options: skip:nil author:nil email:nil creator:nil timestamp:nil
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#+infojs_opt: view:nil toc:t ltoc:t mouse:underline buttons:0 path:http://orgmode.org/org-info.js
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