doomemacs/modules/tools/direnv/config.el

;;; tools/direnv/config.el -*- lexical-binding: t; -*-

(defvar +direnv--keywords
  '("direnv_layout_dir" "PATH_add" "path_add" "log_status" "log_error" "has"
    "join_args" "expand_path" "dotenv" "user_rel_path" "find_up" "source_env"
    "watch_file" "source_up" "direnv_load" "MANPATH_add" "load_prefix" "layout"
    "use" "rvm" "use_nix" "use_guix")
  "TODO")

(def-package! direnv
  :after-call (after-find-file dired-initial-position-hook)
  :config
  (defun +direnv|init ()
    "Instead of checking for direnv on `post-command-hook', check on
buffer/window/frame switch, which is less expensive."
    (direnv--disable)
    (when direnv-mode
      (add-hook 'doom-switch-buffer-hook #'direnv--maybe-update-environment)
      (add-hook 'doom-switch-window-hook #'direnv--maybe-update-environment)
      (add-hook 'doom-switch-frame-hook #'direnv--maybe-update-environment)
      (add-hook 'focus-in-hook #'direnv--maybe-update-environment)))
  (add-hook 'direnv-mode-hook #'+direnv|init)

  (defun +direnv|envrc-fontify-keywords ()
    (font-lock-add-keywords
     nil `((,(regexp-opt +direnv--keywords 'symbols)
            (0 font-lock-keyword-face)))))
  (add-hook 'direnv-envrc-mode-hook #'+direnv|envrc-fontify-keywords)

  (defun +direnv*update (&rest _)
    "Update direnv. Useful to advise functions that may run
environment-sensitive logic like `flycheck-default-executable-find'. This fixes
flycheck issues with direnv and on nix."
    (direnv-update-environment default-directory))
  (advice-add #'flycheck-default-executable-find :before #'+direnv*update)

  (when (executable-find "direnv")
    (direnv-mode +1)))