Awesome

bash-env-elvish

importing Bash environment into Elvish
extracting Bash style shell variables from source files like /etc/os-release
exporting Elvish function which has the same effect on environment as a Bash function
activating/deactivating Python virtualenv
nvm for Node version management

Warning: breaking change in 0.4.0, the Bash backend script bash-env-elvish has been unbundled, and is now consumed as bash-env-json

Example Usage

bash-env

> echo 'export A=1; export B=2; export Z=101' | bash-env:bash-env
> echo $E:A $E:B $E:Z
1 2 101

> cat abc.env
export A=101
export B=102
export C="fooled ya!"

> bash-env:bash-env abc.env
> echo $E:A $E:B $E:C
101 102 fooled ya!

> ssh-agent | bash-env:bash_env
Agent pid 921717
> echo $E:SSH_AUTH_SOCK
/tmp/ssh-XXXXXXI4IoXr/agent.921715

> bash-env:bash-env /etc/os-release

> bash-env:bash-env &shellvars /etc/os-release
▶ [&ANSI_COLOR='1;34' &BASH_LINENO=189 &BUG_REPORT_URL=https://github.com/NixOS/nixpkgs/issues &BUILD_ID=24.11.20240916.99dc878 &DOCUMENTATION_URL=https://nixos.org/learn.html &HOME_URL=https://nixos.org/ &ID=nixos &LOGO=nix-snowflake &NAME=NixOS &PRETTY_NAME='NixOS 24.11 (Vicuna)' &SUPPORT_URL=https://nixos.org/community.html &VERSION='24.11 (Vicuna)' &VERSION_CODENAME=vicuna &VERSION_ID=24.11 &_value=$nil]

> var env = (echo 'f() { export ABC=123; }' | bash-env &fn=[f])
> echo $E:ABC

> $env[fn][f]
> echo $E:ABC
123

virtualenv

> var deactivate~ = (virtualenv:activate ~/virtualenvs/beancount-python-lima)
(beancount-python-lima) pip list
Package               Version
--------------------- -------
beancount-parser-lima 0.6.0
pip                   24.0
setuptools            69.1.0
wheel                 0.42.0

(beancount-python-lima) deactivate
> pip list
Exception: exec: "pip": executable file not found in $PATH
  [tty 4]:1:1-8: pip list

Installation

Note that a recent change was to unbundle the Bash script backend, previously bash-env-elvish, now [bash-env-json](https://github.com/tesujimath/bash-env-json), because it is now generic JSON, shared by the NuShell and Elvish bash-env modules.

Install bash-env-json script somewhere on the PATH (or install the Nix flake).
Use the Elvish modules bash-env and/or virtualenv

epm:install &silent-if-installed=$true github.com/tesujimath/bash-env-elvish
use github.com/tesujimath/bash-env-elvish/bash-env
use github.com/tesujimath/bash-env-elvish/virtualenv

(Optional) Define a function in rc.elv to unwrap bash-env from its namespace

var bash-env~ = $bash-env:bash-env~

Improvements

Virtualenv deactivation is not terribly ergonomic. There may be a more Elven way to do this.
There may be a better way to import these functions into the REPL.