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feat(users/sterni/nix): cursed nix html DSL

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Couldn't sleep, so I made a surprisingly neat way to render HTML
documents in Nix using our favorite feature __findFile:

  let
    inherit (depot.users.sterni.nix.html) __findFile esc;

  in

  <html> {} [
    (<head> {} [
      (<meta> { charset = "utf-8"; } null)
      (<title> {} (esc "hello"))
    ])
    (<body> {} [
      (<h1> {} (esc "hello world"))
    ])
  ]

=> "<html><head><meta charset=\"utf-8\"/><title>hello</title></head><body><h1>hello world</h1></body></html>"

Change-Id: Id36808a56ae3da3b5263c06f29342fc22d105c21
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3410
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
This commit is contained in:
sterni 2021-08-25 02:45:12 +02:00
parent 17d78867bb
commit 9ed439bfbd
3 changed files with 351 additions and 0 deletions
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84
users/sterni/nix/html/tests/default.nix Normal file
View file

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{ depot, pkgs, ... }:
let
inherit (depot.users.sterni.nix.html)
__findFile
esc
withDoctype
;
exampleDocument = withDoctype (<html> { lang = "en"; } [
(<head> {} [
(<meta> { charset = "utf-8"; } null)
(<title> {} "html.nix example document")
(<link> {
rel = "license";
href = "https://code.tvl.fyi/about/LICENSE";
type = "text/html";
} null)
(<style> {} (esc ''
hgroup h2 {
font-weight: normal;
}
dd {
margin: 0;
}
''))
])
(<body> {} [
(<main> {} [
(<hgroup> {} [
(<h1> {} (esc "html.nix"))
(<h2> {} [
(<em> {} "the")
(esc " most cursed HTML DSL ever!")
])
])
(<dl> {} [
(<dt> {} [
(esc "Q: Wait, it's all ")
(<a> {
href = "https://cl.tvl.fyi/q/hashtag:cursed";
} (esc "cursed"))
(esc " nix hacks?")
])
(<dd> {} (esc "A: Always has been. 🔫"))
(<dt> {} (esc "Q: Why does this work?"))
(<dd> {} [
(esc "Because nix ")
(<a> {
href = "https://github.com/NixOS/nix/blob/293220bed5a75efc963e33c183787e87e55e28d9/src/libexpr/parser.y#L410-L416";
} (esc "translates "))
(<a> {
href = "https://github.com/NixOS/nix/blob/293220bed5a75efc963e33c183787e87e55e28d9/src/libexpr/lexer.l#L100";
} (esc "SPATH tokens"))
(esc " like ")
(<code> {} (esc "<nixpkgs>"))
(esc " into calls to ")
(<code> {} (esc "__findFile"))
(esc " in the ")
(<em> {} (esc "current"))
(esc " scope.")
])
])
])
])
]);
in
pkgs.runCommandNoCC "html.nix.html" {
passAsFile = [ "exampleDocument" ];
inherit exampleDocument;
nativeBuildInputs = [ pkgs.html5validator ];
} ''
set -x
test "${esc "<> && \" \'"}" = "&lt;&gt; &amp;&amp; &quot; &#039;"
# slow as hell unfortunately
html5validator "$exampleDocumentPath"
mv "$exampleDocumentPath" "$out"
set +x
''