fb445b517e
Building etc."fish/setEnvironment.fish" needs config.system.build.setEnvironment, which can be very large. And what babelfishTranslate does is to translate env vars exported by bash syntax, which does not need much computing power. This patch can reduce the network traffic when using remote builders with almost no harm.
320 lines
10 KiB
Nix
320 lines
10 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfge = config.environment;
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cfg = config.programs.fish;
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fishAbbrs = concatStringsSep "\n" (
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mapAttrsFlatten (k: v: "abbr -ag ${k} ${escapeShellArg v}")
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cfg.shellAbbrs
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);
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fishAliases = concatStringsSep "\n" (
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mapAttrsFlatten (k: v: "alias ${k} ${escapeShellArg v}")
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(filterAttrs (k: v: v != null) cfg.shellAliases)
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);
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envShellInit = pkgs.writeText "shellInit" cfge.shellInit;
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envLoginShellInit = pkgs.writeText "loginShellInit" cfge.loginShellInit;
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envInteractiveShellInit = pkgs.writeText "interactiveShellInit" cfge.interactiveShellInit;
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sourceEnv = file:
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if cfg.useBabelfish then
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"source /etc/fish/${file}.fish"
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else
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''
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set fish_function_path ${pkgs.fishPlugins.foreign-env}/share/fish/vendor_functions.d $fish_function_path
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fenv source /etc/fish/foreign-env/${file} > /dev/null
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set -e fish_function_path[1]
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'';
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babelfishTranslate = path: name:
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pkgs.runCommandLocal "${name}.fish" {
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nativeBuildInputs = [ pkgs.babelfish ];
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} "${pkgs.babelfish}/bin/babelfish < ${path} > $out;";
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in
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{
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options = {
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programs.fish = {
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enable = mkOption {
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default = false;
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description = lib.mdDoc ''
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Whether to configure fish as an interactive shell.
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'';
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type = types.bool;
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};
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useBabelfish = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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If enabled, the configured environment will be translated to native fish using [babelfish](https://github.com/bouk/babelfish).
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Otherwise, [foreign-env](https://github.com/oh-my-fish/plugin-foreign-env) will be used.
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'';
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};
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vendor.config.enable = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether fish should source configuration snippets provided by other packages.
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'';
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};
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vendor.completions.enable = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether fish should use completion files provided by other packages.
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'';
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};
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vendor.functions.enable = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether fish should autoload fish functions provided by other packages.
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'';
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};
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shellAbbrs = mkOption {
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default = {};
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example = {
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gco = "git checkout";
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npu = "nix-prefetch-url";
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};
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description = lib.mdDoc ''
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Set of fish abbreviations.
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'';
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type = with types; attrsOf str;
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};
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shellAliases = mkOption {
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default = {};
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description = lib.mdDoc ''
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Set of aliases for fish shell, which overrides {option}`environment.shellAliases`.
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See {option}`environment.shellAliases` for an option format description.
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'';
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type = with types; attrsOf (nullOr (either str path));
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};
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shellInit = mkOption {
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default = "";
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description = lib.mdDoc ''
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Shell script code called during fish shell initialisation.
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'';
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type = types.lines;
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};
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loginShellInit = mkOption {
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default = "";
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description = lib.mdDoc ''
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Shell script code called during fish login shell initialisation.
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'';
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type = types.lines;
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};
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interactiveShellInit = mkOption {
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default = "";
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description = lib.mdDoc ''
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Shell script code called during interactive fish shell initialisation.
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'';
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type = types.lines;
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};
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promptInit = mkOption {
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default = "";
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description = lib.mdDoc ''
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Shell script code used to initialise fish prompt.
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'';
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type = types.lines;
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};
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};
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};
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config = mkIf cfg.enable {
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programs.fish.shellAliases = mapAttrs (name: mkDefault) cfge.shellAliases;
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# Required for man completions
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documentation.man.generateCaches = lib.mkDefault true;
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environment = mkMerge [
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(mkIf cfg.useBabelfish
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{
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etc."fish/setEnvironment.fish".source = babelfishTranslate config.system.build.setEnvironment "setEnvironment";
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etc."fish/shellInit.fish".source = babelfishTranslate envShellInit "shellInit";
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etc."fish/loginShellInit.fish".source = babelfishTranslate envLoginShellInit "loginShellInit";
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etc."fish/interactiveShellInit.fish".source = babelfishTranslate envInteractiveShellInit "interactiveShellInit";
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})
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(mkIf (!cfg.useBabelfish)
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{
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etc."fish/foreign-env/shellInit".source = envShellInit;
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etc."fish/foreign-env/loginShellInit".source = envLoginShellInit;
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etc."fish/foreign-env/interactiveShellInit".source = envInteractiveShellInit;
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})
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{
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etc."fish/nixos-env-preinit.fish".text =
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if cfg.useBabelfish
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then ''
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# source the NixOS environment config
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if [ -z "$__NIXOS_SET_ENVIRONMENT_DONE" ]
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source /etc/fish/setEnvironment.fish
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end
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''
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else ''
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# This happens before $__fish_datadir/config.fish sets fish_function_path, so it is currently
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# unset. We set it and then completely erase it, leaving its configuration to $__fish_datadir/config.fish
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set fish_function_path ${pkgs.fishPlugins.foreign-env}/share/fish/vendor_functions.d $__fish_datadir/functions
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# source the NixOS environment config
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if [ -z "$__NIXOS_SET_ENVIRONMENT_DONE" ]
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fenv source ${config.system.build.setEnvironment}
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end
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# clear fish_function_path so that it will be correctly set when we return to $__fish_datadir/config.fish
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set -e fish_function_path
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'';
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}
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{
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etc."fish/config.fish".text = ''
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# /etc/fish/config.fish: DO NOT EDIT -- this file has been generated automatically.
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# if we haven't sourced the general config, do it
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if not set -q __fish_nixos_general_config_sourced
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${sourceEnv "shellInit"}
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${cfg.shellInit}
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# and leave a note so we don't source this config section again from
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# this very shell (children will source the general config anew)
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set -g __fish_nixos_general_config_sourced 1
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end
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# if we haven't sourced the login config, do it
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status --is-login; and not set -q __fish_nixos_login_config_sourced
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and begin
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${sourceEnv "loginShellInit"}
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${cfg.loginShellInit}
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# and leave a note so we don't source this config section again from
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# this very shell (children will source the general config anew)
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set -g __fish_nixos_login_config_sourced 1
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end
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# if we haven't sourced the interactive config, do it
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status --is-interactive; and not set -q __fish_nixos_interactive_config_sourced
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and begin
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${fishAbbrs}
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${fishAliases}
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${sourceEnv "interactiveShellInit"}
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${cfg.promptInit}
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${cfg.interactiveShellInit}
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# and leave a note so we don't source this config section again from
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# this very shell (children will source the general config anew,
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# allowing configuration changes in, e.g, aliases, to propagate)
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set -g __fish_nixos_interactive_config_sourced 1
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end
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'';
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}
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{
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etc."fish/generated_completions".source =
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let
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patchedGenerator = pkgs.stdenv.mkDerivation {
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name = "fish_patched-completion-generator";
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srcs = [
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"${pkgs.fish}/share/fish/tools/create_manpage_completions.py"
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"${pkgs.fish}/share/fish/tools/deroff.py"
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];
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unpackCmd = "cp $curSrc $(basename $curSrc)";
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sourceRoot = ".";
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patches = [ ./fish_completion-generator.patch ]; # to prevent collisions of identical completion files
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dontBuild = true;
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installPhase = ''
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mkdir -p $out
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cp * $out/
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'';
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preferLocalBuild = true;
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allowSubstitutes = false;
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};
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generateCompletions = package: pkgs.runCommand
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"${package.name}_fish-completions"
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(
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{
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inherit package;
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preferLocalBuild = true;
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allowSubstitutes = false;
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}
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// optionalAttrs (package ? meta.priority) { meta.priority = package.meta.priority; }
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)
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''
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mkdir -p $out
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if [ -d $package/share/man ]; then
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find $package/share/man -type f | xargs ${pkgs.python3.interpreter} ${patchedGenerator}/create_manpage_completions.py --directory $out >/dev/null
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fi
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'';
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in
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pkgs.buildEnv {
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name = "system_fish-completions";
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ignoreCollisions = true;
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paths = map generateCompletions config.environment.systemPackages;
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};
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}
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# include programs that bring their own completions
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{
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pathsToLink = []
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++ optional cfg.vendor.config.enable "/share/fish/vendor_conf.d"
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++ optional cfg.vendor.completions.enable "/share/fish/vendor_completions.d"
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++ optional cfg.vendor.functions.enable "/share/fish/vendor_functions.d";
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}
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{ systemPackages = [ pkgs.fish ]; }
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{
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shells = [
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"/run/current-system/sw/bin/fish"
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"${pkgs.fish}/bin/fish"
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];
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}
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];
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programs.fish.interactiveShellInit = ''
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# add completions generated by NixOS to $fish_complete_path
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begin
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# joins with null byte to acommodate all characters in paths, then respectively gets all paths before (exclusive) / after (inclusive) the first one including "generated_completions",
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# splits by null byte, and then removes all empty lines produced by using 'string'
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set -l prev (string join0 $fish_complete_path | string match --regex "^.*?(?=\x00[^\x00]*generated_completions.*)" | string split0 | string match -er ".")
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set -l post (string join0 $fish_complete_path | string match --regex "[^\x00]*generated_completions.*" | string split0 | string match -er ".")
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set fish_complete_path $prev "/etc/fish/generated_completions" $post
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end
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# prevent fish from generating completions on first run
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if not test -d $__fish_user_data_dir/generated_completions
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${pkgs.coreutils}/bin/mkdir $__fish_user_data_dir/generated_completions
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end
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'';
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};
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}
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