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;; -*- lexical-binding: t; -*-
(defun nix--profile-paths ()
"Return a list of all paths in NIX_PROFILES.
The list is ordered from more-specific (the user profile) to the
least specific (the system profile)"
(reverse (split-string (or (getenv "NIX_PROFILES") ""))))
;;; Extend `load-path' to search for elisp files in subdirectories of all folders in `NIX_PROFILES'.
;;; Non-Nix distros have similar logic in /usr/share/emacs/site-lisp/subdirs.el.
;;; See https://www.gnu.org/software/emacs/manual/html_node/elisp/Library-Search.html
(dolist (profile (reverse (nix--profile-paths)))
;; `directory-file-name' is important to add sub dirs to the right place of `load-path'
;; see the source code of `normal-top-level-add-to-load-path'
(let ((default-directory (directory-file-name
(expand-file-name "share/emacs/site-lisp/" profile))))
(when (file-exists-p default-directory)
(setq load-path (cons default-directory load-path))
(normal-top-level-add-subdirs-to-load-path))))
;;; Remove wrapper site-lisp from EMACSLOADPATH so it's not propagated
;;; to any other Emacsen that might be started as subprocesses.
(let ((wrapper-site-lisp (getenv "emacsWithPackages_siteLisp"))
(env-load-path (getenv "EMACSLOADPATH")))
(when wrapper-site-lisp
(setenv "emacsWithPackages_siteLisp" nil))
(when (and wrapper-site-lisp env-load-path)
(let* ((env-list (split-string env-load-path ":"))
(new-env-list (delete wrapper-site-lisp env-list)))
(setenv "EMACSLOADPATH" (when new-env-list
(mapconcat 'identity new-env-list ":"))))))
(let ((wrapper-site-lisp (getenv "emacsWithPackages_siteLispNative"))
(env-load-path (getenv "EMACSNATIVELOADPATH")))
(when wrapper-site-lisp
(setenv "emacsWithPackages_siteLispNative" nil))
(when (and wrapper-site-lisp env-load-path)
(let* ((env-list (split-string env-load-path ":"))
(new-env-list (delete wrapper-site-lisp env-list)))
(setenv "EMACSNATIVELOADPATH" (when new-env-list
(mapconcat 'identity new-env-list ":"))))))
(let ((wrapper-invocation-directory (getenv "emacsWithPackages_invocationDirectory")))
(when wrapper-invocation-directory
(setq invocation-directory (file-name-as-directory wrapper-invocation-directory))
(setenv "emacsWithPackages_invocationDirectory" nil)))
(let ((wrapper-invocation-name (getenv "emacsWithPackages_invocationName")))
(when wrapper-invocation-name
(setq invocation-name wrapper-invocation-name)
(setenv "emacsWithPackages_invocationName" nil)))
;;; Set up native-comp load path.
(when (featurep 'native-compile)
;; Append native-comp subdirectories from `NIX_PROFILES'.
;; Emacs writes asynchronous native-compilation files to the first writable directory[1].
;; At this time, (car native-comp-eln-load-path) is a writable one in `user-emacs-directory'[2].
;; So we keep that one unchanged.
;; [1]: info "(elisp) Native-Compilation Variables"
;; [2]: https://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/startup.el?id=3685387e609753293c4518be75e77c659c3b2d8d#n601
(setq native-comp-eln-load-path
(append (list (car native-comp-eln-load-path))
(mapcar (lambda (profile-dir)
(concat profile-dir "/share/emacs/native-lisp/"))
(nix--profile-paths))
(cdr native-comp-eln-load-path))))
;;; Make `woman' find the man pages
(defvar woman-manpath)
(eval-after-load 'woman
'(setq woman-manpath
(append (mapcar (lambda (x) (concat x "/share/man/"))
(nix--profile-paths))
woman-manpath)))
;;; Make info manuals of installed elisp pkgs available (work around Emacs bug#81105)
(when-let* ((path (getenv "INFOPATH")))
;; Normally, Emacs 31 extends `Info-default-directory-list' when activating elisp pkgs.
;; We add a trailing path-separator ":" to INFOPATH when needed
;; to ensure `Info-default-directory-list' is used to initialize `Info-directory-list'.
(unless (string-suffix-p path-separator path)
(setenv "INFOPATH" (concat path path-separator))))
;;; Make tramp work for remote NixOS machines
(defvar tramp-remote-path)
(eval-after-load 'tramp
;; TODO: We should also add the other `NIX_PROFILES' to this path.
;; However, these are user-specific, so we would need to discover
;; them dynamically after connecting via `tramp'
'(progn
(add-to-list 'tramp-remote-path "/run/current-system/sw/bin")
(add-to-list 'tramp-remote-path "/run/wrappers/bin")))
;;; C source directory
;;;
;;; Computes the location of the C source directory from the path of
;;; the current file:
;;; from: /nix/store/<hash>-emacs-<version>/share/emacs/site-lisp/site-start.el
;;; to: /nix/store/<hash>-emacs-<version>/share/emacs/<version>/src/
(defvar find-function-C-source-directory)
(let ((emacs
(file-name-directory ; .../emacs/
(directory-file-name ; .../emacs/site-lisp
(file-name-directory load-file-name)))) ; .../emacs/site-lisp/
(version
(file-name-as-directory
emacs-version))
(src (file-name-as-directory "src")))
(setq find-function-C-source-directory (concat emacs version src)))
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