rde: features: emacs: Add emacs and various aux features for it v1 APPLIED

Andrew Tropin: 1
 rde: features: emacs: Add emacs and various aux features for it

 2 files changed, 250 insertions(+), 0 deletions(-)
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[PATCH] rde: features: emacs: Add emacs and various aux features for it Export this patch

The idea is to make it possible to get the whole emacs configuration
by composing small rde features, this approach is similiar to
spacemacs layers or doom emacs modules, but have a few advantages over it:

1. It possible to install and configure not only emacs packages, but
also system or home packages.  So such emacs configuration will be
self-contained and won't require any additional setup steps.
2. It will be possible to rely on some other non-emacs rde features,
for example feature-emacs-transmission, can check if
feature-transmission is present and take the host and port from it.
The same approach will work for other relatively complicated setups
involving few different software tools to interact with each other
(emails fetcher, indexer, password manager, emacs).
3. Everything is done in declarative and reproducible way.

For now I decided to generate a package with autoloads for storing
feature-specific emacs configuration and making it loaded on emacs
startup, it's possible to place the same code without autoloads in
init.el, but I decided to try this approach, because I want to
experiment with project-specific emacs subconfigurations in the future
and it will be easier if all configurations will be split into
packages and won't require to edit any files under XDG_CONFIG_HOME or
similar places.
 rde/examples/abcdw/configs.scm |  11 ++
 rde/features/emacs.scm         | 239 +++++++++++++++++++++++++++++++++
 2 files changed, 250 insertions(+)
 create mode 100644 rde/features/emacs.scm

diff --git a/rde/examples/abcdw/configs.scm b/rde/examples/abcdw/configs.scm
index d0251bb..6f70bab 100644
--- a/rde/examples/abcdw/configs.scm
+++ b/rde/examples/abcdw/configs.scm
@@ -13,6 +13,7 @@
  #:use-module (rde features tmux)
  #:use-module (rde features shells)
  #:use-module (rde features ssh)
  #:use-module (rde features emacs)
  #:use-module (gnu system file-systems)
  #:use-module (gnu system mapped-devices)
  #:use-module (gnu packages)
@@ -78,6 +79,16 @@
    #:sway-tty-number 2)

    (pkgs "emacs-guix" "emacs-telega" "emacs-pdf-tools" "emacs-yasnippet"))
    #:org-roam-directory "~/work/notes/notes")

diff --git a/rde/features/emacs.scm b/rde/features/emacs.scm
new file mode 100644
index 0000000..7af068c
--- /dev/null
+++ b/rde/features/emacs.scm
@@ -0,0 +1,239 @@
(define-module (rde features emacs)
  #:use-module (rde features)
  #:use-module (rde features predicates)
  #:use-module (rde emacs packages)
  #:use-module (gnu home-services emacs)
  #:use-module (gnu home-services-utils)
  #:use-module (gnu services)
  #:use-module (gnu packages emacs-xyz)
  #:use-module (guix gexp)

  #:export (feature-emacs

(define* (feature-emacs
	  (emacs-server-mode? #t)
	  (additional-elisp-packages '()))
  "Setup and configure GNU Emacs."
  (ensure-pred boolean? emacs-server-mode?)
  (ensure-pred list-of-elisp-packages? additional-elisp-packages)
  (define (emacs-home-services config)
    "Returns home services related to GNU Emacs."
    (require-value 'full-name config)
    (require-value 'email config)
    (let* ((full-name (get-value 'full-name config))
	   (email     (get-value 'email config)))
	 (package emacs-next-pgtk-latest)
	 (elisp-packages (append
			  (list emacs-modus-themes)))
	 (server-mode? emacs-server-mode?)
	 (xdg-flavor? #f)
	  `((setq user-full-name ,full-name)
	    (setq user-mail-address ,email)
	    (setq custom-file
		  (concat (or (getenv "XDG_CACHE_HOME") "~/.cache")
	    (load custom-file t)
	    (load-theme 'modus-operandi t)
	    (setq message-auto-save-directory
		  (concat (or (getenv "XDG_CACHE_HOME") "~/.cache")
	  `(,(slurp-file-gexp (local-file "../emacs/early-init.el"))))
	 ;;; TODO: Rebuilding packages with emacs will be useful for
	 ;;; native-comp, but for some reason dash.el fails to build,
	 ;;; need to investigate the issue.
	 ;; (rebuild-elisp-packages? #t)

   (name 'emacs)
   (values (append
	    '((emacs . #t))
	    (make-feature-values emacs-server-mode?)))
   (home-services-getter emacs-home-services)))

(define* (feature-emacs-org-mode)
  "Configure org-mode for GNU Emacs."
  (define (emacs-org-mode-home-services config)
    "Returns home services related to org-mode."
    (let* ((configure-org-mode
		 (setq org-adapt-indentation nil)
		 (setq org-edit-src-content-indentation 0)
		 (setq org-startup-indented t)))))))
     (elisp-packages (list emacs-org configure-org-mode)))))))

   (name 'emacs-org-mode)
   (values `((emacs-org-mode . #t)))
   (home-services-getter emacs-org-mode-home-services)))

(define* (feature-emacs-magit)
  "Configure Magit for GNU Emacs."
  (define (emacs-magit-home-services config)
    "Returns home services related to Magit."
    (require-value 'git config)
       (elisp-packages (list emacs-magit))))))

   (name 'emacs-magit)
   (values `((emacs-magit . #t)))
   (home-services-getter emacs-magit-home-services)))

;; TODO: Move font record to apropriate module
(use-modules (rde features fontutils))

;; TODO: Can be useful to have different presets for different
;; environments.  For easier and faster switching.
(define* (feature-emacs-faces)
  "Configure faces for GNU Emacs."
  (define (emacs-faces-home-services config)
    "Returns home services related to faces."
    (require-value 'fonts config)
    (let* ((font-monospace      (get-value 'font-monospace config))
	   (font-sans           (get-value 'font-sans config))

		   (let* ((mono-fn ,(font-name font-monospace))
			  (sans-fn ,(font-name font-sans))
			  (mono (font-spec
				 :name ,(font-name font-monospace)
				 :size   ,(font-size font-monospace)
				 :weight ',(or (font-weight font-monospace) 'normal)))
			  ;; For people coming here years later, only
			  ;; face which can contain size or integer
			  ;; height is default, everything else should
			  ;; set only family or relative height
			  ;; (decimal value), the font-spec even
			  ;; without height/size shouldn't be used.
			  ;; Otherwise text-adjust and other stuff can
			  ;; be broken.
			  (faces `((default ((t (:font ,mono))))
				   (fixed-pitch ((t (:family ,mono-fn))))
				   (button ((t (:inherit (fixed-pitch)))))
				   (variable-pitch ((t (:family ,sans-fn)))))))
		     (dolist (face faces)
			     (custom-set-faces face))

		     (dolist (face faces)
			  (put (car face) 'saved-face nil))))))))
	 (elisp-packages (list configure-faces)))))))

   (name 'emacs-faces)
   (values `((emacs-faces . #t)))
   (home-services-getter emacs-faces-home-services)))

(define* (feature-emacs-completion)
  "Configure completion system for GNU Emacs."
  (define (emacs-completion-home-services config)
    "Returns home services related to Emacs completion system."
    (let* ((configure-completion
		(setq completion-styles '(orderless))
		(setq savehist-file
		      (concat (or (getenv "XDG_CACHE_HOME") "~/.cache")
		(savehist-mode 1))))))
	 (elisp-packages (list configure-completion emacs-orderless)))))))

   (name 'emacs-completion)
   (values `((emacs-completion . #t)))
   (home-services-getter emacs-completion-home-services)))

(define* (feature-emacs-org-roam
	  (org-roam-directory #f))
  "Configure org-rome for GNU Emacs."
  (define (not-boolean? x) (not (boolean? x)))
  (ensure-pred not-boolean? org-roam-directory)

  (define (emacs-org-roam-home-services config)
    "Returns home services related to org-roam."
    (let* ((configure-org-roam
		(add-hook 'after-init-hook 'org-roam-mode)
		 (define-key org-roam-mode-map
		   (kbd "C-c n n") 'org-roam)
		 (define-key org-roam-mode-map
		   (kbd "C-c n f") 'org-roam-find-file)
		 (define-key org-mode-map
		   (kbd "C-c n i") 'org-roam-insert)
		 (setq org-roam-directory ,org-roam-directory)))))))
	 (elisp-packages (list configure-org-roam emacs-org-roam)))))))

   (name 'emacs-org-roam)
   (values `((emacs-org-roam . #t)))
   (home-services-getter emacs-org-roam-home-services)))

;; TODO: feature-emacs-reasonable-keybindings
;; TODO: Fix env vars for emacs daemon
;; https://github.com/purcell/exec-path-from-shell
;; TODO: feature-emacs-epub https://depp.brause.cc/nov.el/