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fish: use babelfish for hm-session-vars.sh (#4012)

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* home-environment: add `home.sessionVariablesPackage`

Allow the `hm-session-vars.sh` derivation to be referenced from other
modules, e.g. to translate it to fish with babelfish at build time.

* fish: use babelfish for `hm-session-vars.sh`

Translate `hm-session-vars.sh` to fish at system build time,
significantly decreasing shell startup time.

Based on https://github.com/NixOS/nixpkgs/pull/108947 by @kevingriffin.
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Emily 2023-05-31 23:01:27 +01:00 • committed by GitHub
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8
docs/release-notes/rl-2305.adoc
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@ -38,6 +38,14 @@ with Nix flakes uses this new command.
The standard installation method remains the same but uses the new command internally.
See <<sec-flakes-standalone>> for more.
* When using <<opt-programs.fish.enable>>, the setup code
for <<opt-home.sessionVariables>> is now translated
with https://github.com/bouk/babelfish[babelfish].
This should result in significantly faster shell startup times
but could theoretically break
if you have very complex bash expressions in a session variable.
Please report any issues you experience.
[[sec-release-23.05-state-version-changes]]
=== State Version Changes