Flakes: Difference between revisions

Line 349:

{{warning|TODO: there is an alternative version where the defaultPackage is a pkgs.buildEnv that contains all the dependencies. And then nix shell is used to open the environment.}}

=== ~~Direnv integration~~ ===

=== Automatically switch nix shells with nix-direnv ===

~~Assuming that the flake defines a <code>devShell</code> output attribute and that~~ you ~~are using direnv. Here is how to replace the old use nix stdlib function~~ with ~~the faster flake version:~~

You can easily switch nix shells when you cd into different projects with nix-direnv. [https://github.com/nix-community/nix-direnv View their guide here]

~~<syntaxHighlight lang=sh>~~

~~use_flake() {~~

~~watch_file flake.nix~~

~~watch_file flake.lock~~

~~eval "$(~~nix ~~print-dev-env --profile "$(direnv_layout_dir)/flake~~-~~profile")"~~

}

~~</syntaxHighlight>~~

~~Copy this in <code>~/.config/direnv/lib/use_flake.sh</code> or in <code>~/.config/~~direnv~~/direnvrc</code>~~

~~or directly in your project specific <code>.envrc</code>~~.

~~Note: You may not need to create <code>use_flake()</code> yourself; as of~~ [https://github.com/~~direnv~~/direnv~~/releases/tag/v2.29.0#:~:text=add%20use_flake%20function direnv 2.29,~~] ~~<code>use flake</code> is part of direnv's standard library.~~

~~With this in place, you can now replace the use nix invocation in the <code>.envrc</code> file with <code>use flake</code>:~~

~~<syntaxHighlight lang=text>~~

~~# .envrc~~

~~use flake~~

~~</syntaxHighlight>~~

~~The nice thing about this approach is that evaluation is cached.~~

==== Optimize the reloads ====

@@ Line 349: / Line 349: @@
 {{warning|TODO: there is an alternative version where the defaultPackage is a pkgs.buildEnv that contains all the dependencies. And then nix shell is used to open the environment.}}
-=== Direnv integration ===
+=== Automatically switch nix shells with nix-direnv ===
-Assuming that the flake defines a <code>devShell</code> output attribute and that you are using direnv. Here is how to replace the old use nix stdlib function with the faster flake version:
+You can easily switch nix shells when you cd into different projects with nix-direnv. [https://github.com/nix-community/nix-direnv View their guide here]
-<syntaxHighlight lang=sh>
-use_flake() {
-  watch_file flake.nix
-  watch_file flake.lock
-  eval "$(nix print-dev-env --profile "$(direnv_layout_dir)/flake-profile")"
-}
-</syntaxHighlight>
-Copy this in <code>~/.config/direnv/lib/use_flake.sh</code> or in <code>~/.config/direnv/direnvrc</code>
-or directly in your project specific <code>.envrc</code>.
-Note: You may not need to create <code>use_flake()</code> yourself; as of [https://github.com/direnv/direnv/releases/tag/v2.29.0#:~:text=add%20use_flake%20function direnv 2.29,] <code>use flake</code> is part of direnv's standard library.
-With this in place, you can now replace the use nix invocation in the <code>.envrc</code> file with <code>use flake</code>:
-<syntaxHighlight lang=text>
-# .envrc
-use flake
-</syntaxHighlight>
-The nice thing about this approach is that evaluation is cached.
 ==== Optimize the reloads ====