nixpkgs/nixos/modules/programs/xonsh.nix

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# This module defines global configuration for the xonsh.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.programs.xonsh;
in
{
options = {
programs.xonsh = {
enable = mkOption {
default = false;
description = ''
Whether to configure xonsh as an interactive shell.
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'';
type = types.bool;
};
package = mkOption {
type = types.package;
default = pkgs.xonsh;
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example = literalExample "pkgs.xonsh.override { configFile = \"/path/to/xonshrc\"; }";
description = ''
xonsh package to use.
'';
};
config = mkOption {
default = "";
description = "Control file to customize your shell behavior.";
type = types.lines;
};
};
};
config = mkIf cfg.enable {
environment.etc.xonshrc.text = ''
# /etc/xonshrc: DO NOT EDIT -- this file has been generated automatically.
if not ''${...}.get('__NIXOS_SET_ENVIRONMENT_DONE'):
# The NixOS environment and thereby also $PATH
# haven't been fully set up at this point. But
# `source-bash` below requires `bash` to be on $PATH,
# so add an entry with bash's location:
$PATH.add('${pkgs.bash}/bin')
# Stash xonsh's ls alias, so that we don't get a collision
# with Bash's ls alias from environment.shellAliases:
_ls_alias = aliases.pop('ls', None)
# Source the NixOS environment config.
source-bash "${config.system.build.setEnvironment}"
# Restore xonsh's ls alias, overriding that from Bash (if any).
if _ls_alias is not None:
aliases['ls'] = _ls_alias
del _ls_alias
${cfg.config}
'';
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environment.systemPackages = [ cfg.package ];
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environment.shells =
[ "/run/current-system/sw/bin/xonsh"
"${cfg.package}/bin/xonsh"
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];
};
}