test.nix

let
  pkgs = import <nixpkgs> { config = {}; overlays = []; };
  lib = pkgs.lib;
  mustache = import ./mustache { inherit lib; };
  # TODO: better {{{}}} handing?
  tests = [
    { t = "hello, {{name}} {{name}}"; v = { name = "World"; }; e = "hello, World World"; }
    { t = "hello, {{ name }} {{  name   }}"; v = { name = "World"; }; e = "hello, World World"; }
    { t = "{{#foo}}{{.}} is {{foo}}{{/foo}}"; v = { foo = "bar"; }; e = "bar is bar"; }
    { t = "hello, {{#name}}friend{{/name}}"; v = { name = "World"; }; e = "hello, friend"; }
    { t = "hello, {{#name}}friend{{/name}}"; v = { }; e = "hello, "; }
    { t = "hello, {{! comment}} friend"; v = { }; e = "hello,  friend"; }
    { t = "hello, {{! \ncom\nment\n\n}} friend"; v = { }; e = "hello,  friend"; }
    { t = "packages: {{#packages}}-{{/packages}}"; v = { packages = ["a" "b" "c"]; }; e = "packages: ---"; }
    { t = "function {{call}}"; v = { call = v: "call!"; }; e = "function call!"; }
    { t = "is {{#call}}{{name}} ok{{/call}}?"; v = { call = text: "[" + text + "]" ; name = "Alex"; }; e = "is [Alex ok]?"; }
    { t = "package: {{#packages}}{{.}}{{/packages}}"; v = { packages = "a"; }; e = "package: a"; }
    { t = "packages: {{#packages}}{{.}},{{/packages}}"; v = { packages = ["a" "b" "c"]; }; e = "packages: a,b,c,"; }
    { t = "{{#os}}os {{.}} packages: {{#packages}}{{.}},{{/packages}} {{/os}}"; v = { packages = ["a" "b" "c"]; os = ["win" "mac"]; };
      e = "os win packages: a,b,c, os mac packages: a,b,c, "; }
    { t = "hello, {{^name}}no friend{{/name}}"; v = { }; e = "hello, no friend"; }
    { t = "hello, {{^name}}no friend{{/name}}"; v = { name = false; }; e = "hello, no friend"; }
    { t = "hello, {{name}}"; v = {}; e = "hello, "; }
    { t = "hello, {{#person}}{{name}} {{/person}}"; v = { name = "Default"; person = [1 { name = "Alex"; }]; }; e = "hello, Default Alex "; }
    { t = "1 + 2 = {{n}}"; v = { n = 3; }; e = "1 + 2 = 3"; }
    { t = "dot syntax is {{obj.goes.deep}}"; v = { obj = { goes = { deep = "deep"; }; }; }; e = "dot syntax is deep"; }
    { t = "dot syntax in section is {{#obj.goes}}{{deep}}{{/obj.goes}}"; v = { obj = { goes = { deep = "deep"; }; }; }; e = "dot syntax in section is deep"; }
    { t = "with escape: {{html}}, without: {{&html}}"; v = { html = "<tag>"; }; e = "with escape: &lt;tag&gt;, without: <tag>"; }
    { t = "| A {{#bool}}B {{#bool}}C{{/bool}} D{{/bool}} E |"; v = { bool = true; }; e = "| A B C D E |"; }
    { t = "a\n{{! comment }}\nb"; v = {}; e = "a\nb"; }
    { t = "a\n{{ comment }}\nb"; v = { comment = "c"; }; e = "a\nc\nb"; }
    { t = "a\n{{#f}}\n {{#f}}\n  {{#f}}\n   {{#f}}\n1\n   {{/f}}\n  {{/f}}\n {{/f}}\n{{/f}}"; v = { f = true; }; e = "a\n1\n"; }
    { t = "a{{>text}}"; v = { x = 1; }; e = "a1"; p = n: "{{x}}"; }
    { t = "{{=<% %>=}}(<%text%>)"; v = { text = "Hey!"; }; e = "(Hey!)"; }
    { t = "{{a}} + {{b}} = {{c}}"; v = rec { a = 1; b = 2; c = a + b; }; e = "1 + 2 = 3"; }
    
    { t = "{{#a}}{{x}}{{/a}}"; v = { a = [{ x = { y = 1; }; }]; }; e = false; }
    { t = "{{#a}}{{.}}{{/b}}"; v = { a = 1; }; e = false; }
    { t = "{{#a}}{{#b}}{{.}}"; v = { a = 1; }; e = false; }
  ];
  
  createTest = idx: case: let
    renderResult = mustache { template = case.t; view = case.v; config = {
      escape = lib.strings.escapeXML;
      partial = case.p or null;
    }; };
    result = if case.e == false then (builtins.tryEval renderResult).success
             else renderResult;
  in {
    name = "test#${builtins.toString idx}";
    value = {
      expr = result;
      expected = case.e;
    };
  };

  cases = lib.lists.imap0 createTest tests;
in lib.debug.runTests (builtins.listToAttrs cases)