nixpkgs/pkgs/shells/fish/wrapper.nix

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{ lib, writeShellScriptBin, fish }:
with lib;
makeOverridable ({
completionDirs ? [],
functionDirs ? [],
confDirs ? [],
pluginPkgs ? []
}:
let
vendorDir = kind: plugin: "${plugin}/share/fish/vendor_${kind}.d";
complPath = completionDirs ++ map (vendorDir "completions") pluginPkgs;
funcPath = functionDirs ++ map (vendorDir "functions") pluginPkgs;
confPath = confDirs ++ map (vendorDir "conf") pluginPkgs;
in writeShellScriptBin "fish" ''
${fish}/bin/fish --init-command "
set --prepend fish_complete_path ${escapeShellArgs complPath}
set --prepend fish_function_path ${escapeShellArgs funcPath}
set --local fish_conf_source_path ${escapeShellArgs confPath}
for c in $fish_conf_source_path/*; source $c; end
" "$@"
'')