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authorsterni <sternenseemann@systemli.org>2021-08-25T00·45+0200
committersterni <sternenseemann@systemli.org>2021-08-26T15·34+0000
commit9ed439bfbddee7915c4011f8a6ba7562b3375ac8 (patch)
tree6343c44bb40676d684aceec57bab7b26388f7914 /users/sterni/nix/html/tests/default.nix
parent17d78867bbef8a3df1271137a2db18b3584cdc39 (diff)
feat(users/sterni/nix): cursed nix html DSL r/2784
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>
Diffstat (limited to 'users/sterni/nix/html/tests/default.nix')
-rw-r--r--users/sterni/nix/html/tests/default.nix84
1 files changed, 84 insertions, 0 deletions
diff --git a/users/sterni/nix/html/tests/default.nix b/users/sterni/nix/html/tests/default.nix
new file mode 100644
index 000000000000..8688b6937130
--- /dev/null
+++ b/users/sterni/nix/html/tests/default.nix
@@ -0,0 +1,84 @@
+{ 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
+''