direnv-stdlib man page

direnv_stdlib — the ".envrc" stdlib


direnv stdlib


Outputs a bash script called the stdlib. The following commands are included in that script and loaded in the context of an ".envrc". In addition, it also loads the file in "~/.direnvrc" if it exists.


has command: Returns 0 if the command is available. Returns 1 otherwise. It can be a binary in the PATH or a shell function.


if has curl; then
  echo "Yes we do"
expand_path rel_path [relative_to]: Outputs the absolute path of rel_path relative to relative_to or the current directory.


cd /usr/local/games
expand_path ../foo
# output: /usr/local/foo
dotenv [dotenv_path]: Loads a ".env" file into the current environment
user_rel_path abs_path: Transforms an absolute path abs_path into a user-relative path if possible.


echo $HOME
# output: /home/user
user_rel_path /home/user/my/project
# output: ~/my/project
user_rel_path /usr/local/lib
# output: /usr/local/lib
find_up filename: Outputs the path of filename when searched from the current directory up to /. Returns 1 if the file has not been found.


cd /usr/local/my
mkdir -p project/foo
touch bar
cd project/foo
find_up bar
# output: /usr/local/my/bar
source_env fileordir_path: Loads another ".envrc" either by specifying its path or filename.
source_up [filename]: Loads another ".envrc" if found with the find_up command.
direnv_load [command-generating-dump-output] Applies the environment generated by running argv as a command. This is useful for adopting the environment of a child process - cause that process to run "direnv dump" and then wrap the results with direnv_load.


direnv_load opam-env exec -- direnv dump
PATH_add path: Prepends the expanded path to the PATH environment variable. It prevents a common mistake where PATH is replaced by only the new path.


# output: /home/user/my/project
PATH_add bin
echo $PATH
# output: /home/user/my/project/bin:/usr/bin:/bin
path_add varname path: Works like PATH_add except that it's for an arbitrary varname.
load_prefix prefix_path: Expands some common path variables for the given prefix_path prefix. This is useful if you installed something in the prefix_path using ./configure --prefix=$prefix_path && make install and want to use it in the project.

Variables set:



./configure --prefix=$HOME/rubies/ruby-1.9.3
make && make install
# Then in the .envrc
load_prefix ~/rubies/ruby-1.9.3
layout type: A semantic dispatch used to describe common project layouts.
layout go: Sets the GOPATH environment variable to the current directory.
layout node: Adds "$PWD/node_modules/.bin" to the PATH environment variable.
layout perl: Setup environment variables required by perl's local::lib See ⟨http://search.cpan.org/dist/local-lib/l…⟩ for more details
layout python [python_exe]: Creates and loads a virtualenv environment under $PWD/.direnv/python-$python_version. This forces the installation of any egg into the project's sub-folder.

It's possible to specify the python executable if you want to use different versions of python (eg: layout python python3).

Note that previously virtualenv was located under $PWD/.direnv/virtualenv and will be re-used by direnv if it exists.

layout python3: A shortcut for layout python python3
layout ruby: Sets the GEMHOME environment variable to `$PWD/.direnv/ruby/RUBYVERSION. This forces the installation of any gems into the project's sub-folder. If you're using bundler it will create wrapper programs that can be invoked directly instead of using thebundle exec` prefix.
use program_name [version]: A semantic command dispatch intended for loading external dependencies into the environment.


use_ruby() {
  echo "Ruby $1"
use ruby 1.9.3
# output: Ruby 1.9.3
use rbenv: Loads rbenv which add the ruby wrappers available on the PATH.
use nix [...]: Load environment variables from nix-shell.

If you have a default.nix or shell.nix these will be used by default, but you can also specify packages directly (e.g use nix -p ocaml).

See ⟨http://nixos.org/nix/manual/#sec-nix-sh…

rvm ...: Should work just like in the shell if you have rvm installed.
use node: Loads NodeJS version from a .node-version or .nvmrc file.

If you specify a partial NodeJS version (i.e. 4.2), a fuzzy match is performed and the highest matching version installed is selected.

Example (.envrc):

set -e
use node

Example (.node-version):

use node version: Loads specified NodeJS version.

Example (.envrc):

set -e
use node 4.2.2
watch path: Adds a file to direnv's watch-list. If the file changes direnv will reload the environment on the next prompt.

Example (.envrc):

watch Gemfile

See Also


Referenced By


Explore man page connections for direnv-stdlib(1).

direnv APRIL 2014