dotenv.el — Plugin for loading .env project files.

Dotenv parser by following rules:

• skip empty lines
• trim every string (all spaces before first non-whitespace char and after last non-whitespace char will be removed)
• skip commentary lines (# at the line start)
• skip lines which doesn’t look like an proper assignment
• variable name and its value will be trimmed

Installation

use-package

(use-package dotenv
  :ensure nil
  :quelpa
  (dotenv :repo "pkulev/dotenv.el"
          :fetcher github :upgrade t))

Examples

Integration with projectile

Hook for loading project’s .env (if exists) after switching project via projectile.

(use-package dotenv
  :ensure nil
  :after projectile
  :quelpa
  (dotenv :repo "pkulev/dotenv.el"
          :fetcher github :upgrade t)
  :config
  (defun dotenv-projectile-hook ()
   "Projectile hook."
   (dotenv-update-project-env (projectile-project-root)))

  (add-to-list 'projectile-after-switch-project-hook #'dotenv-projectile-hook))

Transform variable name or contents using dotenv-transform-alist

In this example .env file contains PYTHONPATH among other vaiables. Assuming that PYTHONPATH contains list of pathes (delimeted by ’:’) relative to the project’s root we can transform it into absolute. To do that add to dotenv-transform-alist a pair of a predicate function and a transform function. Predicate function takes k and v and returns t or nil, transform function takes k and v and returns two-element list with new values for k and v.

(use-package dotenv
  :ensure nil
  :after projectile
  :quelpa
  (dotenv :repo "pkulev/dotenv.el"
          :fetcher github :upgrade t)
  :config
  (defun dotenv-absolutify-pythonpath (k v)
    (list k (dotenv-absolutify-path-var-in-project v)))

  (add-to-list
   'dotenv-transform-alist
   '((lambda (k v) (string= k "PYTHONPATH")) . dotenv-absolutify-pythonpath))

  (defun dotenv-projectile-hook ()
   "Projectile hook."
   (dotenv-update-project-env (projectile-project-root)))

  (add-to-list 'projectile-after-switch-project-hook #'dotenv-projectile-hook))

API reference

Customizable variables

name	type	description
dotenv-file-name	string	Dotenv file name (default: .env).
dotenv-transform-alist	alist	List of predicate-transform pairs for
		custom key or/and value processing.

Public functions

name	arguments	returns	description
dotenv-load	abs-path (str)	list of (k . v) pairs	Load .env from file.
dotenv-get	key (str), path (str)	string	Returns string value
			by provided key.
dotenv-set	TODO	TODO	TODO
dotenv-update-project-env	project-root (str)	nil	Updates project environment
			with .env.
dotenv-update-env	env-pairs, ?override	TODO	TODO
dotenv-dump-env