direnv integration for emacs
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README.rst

emacs-direnv

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overview

this package provides direnv integration for emacs.

mandatory screenshot

it works by invoking direnv to obtain the environment for the current file, then updating the emacs variables process-environment and exec-path.

the result is that programs started from within emacs, such as inferior shells, linters, compilers, and test runners, will be looked up in the correct $PATH, and will be started with the correct environment variables set.

installation

with use-package:

(use-package direnv)

manually:

M-x package-install RET direnv RET

alternatively, put the elisp file somewhere in the loading path and load it explicitly:

(require 'direnv)

also make sure that the direnv version (direnv version) is at least 2.8.0 since this package uses the json export capabilities (direnv export json).

usage

the command direnv-update-environment provides the core functionality of this package: it updates the emacs environment to the direnv environment for the current file. the minibuffer will show a message with a summary of the changes made to the environment, similar to what direnv does in a shell.

the global minor mode direnv-mode does the same, but automatically updates the emacs environment when the active buffer changes, so that the environment always matches the current file. to automatically enable this behaviour when emacs starts, put this in your ~/.emacs/init.el:

(direnv-mode)

or use the use-package :config block:

(use-package direnv
 :config
 (direnv-mode))

additionally, the direnv-edit command acts like direnv edit from a shell: it edits the .envrc file associated with the current directory or one of its parent directories.

configuration

this packages offers various configuration settings. these settings can be set in a use-package :custom block, using (setq), or via the customize interface:

M-x customize-group RET direnv RET

the available settings are outlined below.

  • direnv-always-show-summary

    when direnv-mode automatically changes the environment, a summary message will be shown in the minibuffer. summary messages of automatic changes can be suppressed by setting direnv-always-show-summary to nil. interactive calls, e.g. direnv-update-environment, will still show a summary message.

  • direnv-show-paths-in-summary

    the summary message contains the paths of the old and new directories, which may be a bit too verbose for your taste. the direnv-show-paths-in-summary variable controls whether the summary includes path names. to get shorter summary messages, use nil.

  • direnv-use-faces-in-summary

    the summary message uses different font faces for added, changed, and removed environment variables. depending on your theme, this usually results in different colours. this behaviour can be disabled by setting direnv-use-faces-in-summary to nil.

  • direnv-non-file-modes

    this is a list of modes where direnv will update even if the buffer has no file. examples include shells and interactive compilation (comint) buffers. example usage (with use-package):

    (use-package foobar
     :config
     (add-to-list 'direnv-non-file-modes 'foobar-mode))

troubleshooting

if you experience problems, first check the hidden buffer named *direnv* (with a leading space before the name). this buffer contains the output of the last direnv invocation, which will likely contain more information about the source of the problem.

this buffer will be automatically shown when direnv exits with a non-zero status code, but for non-fatal problems such as incorrect .envrc files you may have to open this buffer manually for inspection.

if you use direnv-mode and an error occurs, emacs will automatically disable the hook that direnv-mode installed. after fixing the problem, call direnv-update-environment manually to ensure the problem is solved, then re-enable direnv-mode.

contributing

praise? complaints? bugs? questions? ideas?

please use the github issue tracker.

credits

this emacs package was created by wouter bolsterlee (@wbolster).

it incorporates ideas from earlier packages created by jonathan lange (@jml) and christian romney (@christianromney).

history

  • 1.5.0 (…)
    • handle indirect buffers correctly; see #25
  • 1.4.0 (2018-03-01)
    • smarter default behaviour of summary messages on environment change; see #23
  • 1.3.0 (2018-02-13)
    • improved operation with non-file modes, such as shells and compilation buffers. see direnv-non-file-modes.
  • 1.2.1 (2017-06-22)
    • direnv-mode no longer fails when opening a file in a directory that does not (yet) exist.
  • 1.2.0 (2017-05-01)
    • summary message now uses custom font faces (colours!)
    • improved error handling
  • 1.1.0 (2017-03-09)
    • implemented summary message after updating environment, and configuration variables to tweak how it works.
    • expanded docs
  • 1.0.1 (2017-03-08)
    • initial release with basic functionality

license

(this is the osi approved 3-clause "new bsd license".)

copyright 2017 wouter bolsterlee

all rights reserved.

redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  • redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  • neither the name of the author nor the names of the contributors may be used to endorse or promote products derived from this software without specific prior written permission.

this software is provided by the copyright holders and contributors "as is" and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. in no event shall the copyright holder or contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage.