102 lines
2.9 KiB
Nix
102 lines
2.9 KiB
Nix
flake: {
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config,
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pkgs,
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lib,
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system,
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...
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}: let
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cfg = config.programs.packer;
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templatePath = "${config.home.homeDirectory}/.config/packer/template.clj";
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app = pkgs.runCommand "packer" {buildInputs = [pkgs.makeWrapper];} ''
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makeWrapper ${flake.outputs.packages.${system}.packer}/bin/packer $out/bin/packer --set PACKER_TEMPLATE_FILE "${templatePath}"
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'';
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in {
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options.programs.packer = with lib; {
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enable = mkEnableOption "Packer application";
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templateFile = mkOption {
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type = types.nullOr types.path;
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description = "The path to template file. If provided, the 'template' option will be ignored.";
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default = null;
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example = "./packer.template.clj";
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};
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template = mkOption {
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type = types.str;
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description = "The content of the template file written in Clojure language.";
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default = ''
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(use 'packer.model)
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(require 'packer.util)
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; Define some useful function
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; to provide a constant number of items.
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(defn x [n] (fn [_] n))
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; Define a store - the single source
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; of truth of all items from which
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; we are going to choose what we want to pack.
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; The items are grouped by categories.
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(def store {
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:cloths [
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(->Item :t-shirt #(/ % 4))
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]
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:electronics [
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(->Item :smartphone (x 1))
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(->Item :tablet (x 1))
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(->Item :laptop (x 1))
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]
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})
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; Define the display names for each
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; item, category and question.
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(def i18n {
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:nights? "How many nights?"
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:tablet? "Do you need your tablet there?"
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:laptop? "Do you need your laptop there?"
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:electronics "Electronics"
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:cloths "Cloths"
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:t-shirt "T-shirt"
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:smartphone "Smartphone"
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:tablet "Tablet"
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:laptop "Laptop"
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})
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; Define some utility function
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; to generate preset basing on some question
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(defn preset [question items seq]
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(if (packer.util/ask-bool (get i18n question))
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(concat seq items)
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seq))
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; Define profile - a function which takes
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; a number of provided nights and produces
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; the sequence of all items which should
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; be in the target list. If the sequence is empty
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; no item will be produced on the target list.
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(defn profile [nights]
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(->> [:smartphone :t-shirt]
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(preset :tablet? [:tablet])
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(preset :laptop? [:laptop])))
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; Wrap it up together. It should be
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; the last expression in the file.
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(->Template store i18n profile)
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'';
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};
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};
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config = lib.mkIf cfg.enable {
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home.packages = [app];
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home.file.${templatePath} =
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if (cfg.templateFile != null)
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then {
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source = cfg.templateFile;
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}
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else {
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text = cfg.template;
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};
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};
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}
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