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Modules/Fish: Add mechanism to load/unload fish environment shells with direnv

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Christoph Urlacher
2026-04-20 11:27:18 +02:00
parent f259b7d326
commit 2533183d80
7 changed files with 258 additions and 45 deletions
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63
config/flake.nix
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@ -98,38 +98,65 @@ rec {
buildDebug = mkBuildScript "Debug";
buildRelease = mkBuildScript "Release";
# Use this to specify commands that should be ran after entering fish shell
initProjectShell = pkgs.writers.writeFish "init-shell.fish" ''
echo "Entering \"${description}\" environment..."
# Determine the project root, used e.g. in cmake scripts
set -g -x FLAKE_PROJECT_ROOT (git rev-parse --show-toplevel)
# Add project-local fish abbrs here
abbrs = {
# Rust Bevy:
# abbr -a build-release-windows "CARGO_FEATURE_PURE=1 cargo xwin build --release --target x86_64-pc-windows-msvc"
# build-release-windows = "CARGO_FEATURE_PURE=1 cargo xwin build --release --target x86_64-pc-windows-msvc";
# C/C++:
# abbr -a cmake-debug "${cmakeDebug}"
# abbr -a cmake-release "${cmakeRelease}"
# abbr -a build-debug "${buildDebug}"
# abbr -a build-release "${buildRelease}"
# cmake-debug = "${cmakeDebug}";
# cmake-release = "${cmakeRelease}";
# build-debug = "${buildDebug}";
# build-release = "${buildRelease}";
# Clojure:
# abbr -a clojure-deps "deps-lock --lein"
# clojure-deps = "deps-lock --lein";
# Python:
# abbr -a run "python ./app/main.py"
# abbr -a profile "py-spy record -o profile.svg -- python ./app/main.py && firefox profile.svg"
# abbr -a ptop "py-spy top -- python ./app/main.py"
# run = "python ./app/main.py";
# profile = "py-spy record -o profile.svg -- python ./app/main.py && firefox profile.svg";
# ptop = "py-spy top -- python ./app/main.py";
};
eraseAbbr = name: value: ''abbr --erase ${name} 2>/dev/null'';
createAbbr = name: value: ''abbr -a ${name} "${value}"'';
# This will be sourced by the global fish config if INIT_PROJECT_SHELL gets unset
unloadProjectShell = pkgs.writers.writeFish "unload-shell.fish" ''
echo "Unloading \"${description}\" environment..."
${builtins.concatStringsSep "\n" (lib.mapAttrsToList eraseAbbr abbrs)}
'';
# This will be sourced by the global fish config if INIT_PROJECT_SHELL gets set
initProjectShell = pkgs.writers.writeFish "init-shell.fish" ''
# Unload just in case, to not have redefinition errors
source ${unloadProjectShell}
echo "Sourcing \"${description}\" environment..."
${builtins.concatStringsSep "\n" (lib.mapAttrsToList createAbbr abbrs)}
'';
in
builtins.concatStringsSep "\n" [
# Launch into pure fish shell
''
exec "$(type -p fish)" -C "source ${initProjectShell} && abbr -a menu '${pkgs.bat}/bin/bat "${initProjectShell}"'"
# Determine the project root, used e.g. in cmake scripts
export FLAKE_PROJECT_ROOT="$(git rev-parse --show-toplevel)"
# Can't do the "exec" with nix-direnv
# - The "exec fish" would call direnv again => Infinite loop
# - The shellHook is Bash/POSIX, so fish syntax doesn't work
# Use this for "nix develop" without direnv
# exec "$(type -p fish)" -C "source ${initProjectShell} && abbr -a menu '${pkgs.bat}/bin/bat "${initProjectShell}"'"
# Use this for direnv without "nix develop"
export INIT_PROJECT_SHELL="${initProjectShell}"
export UNLOAD_PROJECT_SHELL="${unloadProjectShell}"
''
# Qt: Launch into wrapped fish shell
# Qt: Launch into wrapped fish shell (direnv incompatible)
# https://nixos.org/manual/nixpkgs/stable/#sec-language-qt
# ''
# fishdir=$(mktemp -d)