[PATCH 3/4] Documentation/jekyll: patch for AsciiDoc examples

[Alyssa Ross <hi@alyssa.is>]

The documentation I would like to add for the build configuration file
uses a titled example, which doesn't render nicely with Just The Docs
without this change.

Signed-off-by: Alyssa Ross <hi@alyssa.is>
---
 Documentation/jekyll.nix | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/Documentation/jekyll.nix b/Documentation/jekyll.nix
index 6f2866f..16c2c38 100644
--- a/Documentation/jekyll.nix
+++ b/Documentation/jekyll.nix
@@ -3,11 +3,39 @@
 
 { config ? import ../nix/eval-config.nix {} }: config.pkgs.callPackage (
 
-{ bundlerApp }:
+{ lib, bundlerApp, defaultGemConfig, fetchFromGitHub, fetchpatch }:
 
 bundlerApp {
   pname = "jekyll";
   gemdir = ./.;
   exes = [ "jekyll" ];
+
+  gemConfig = defaultGemConfig // {
+    # We override Just the Docs to improve AsciiDoc support.
+    just-the-docs = attrs:
+      let super = defaultGemConfig.just-the-docs or (lib.const {}) attrs; in
+      super // {
+        # The gem tarball doesn't contain e.g. the SCSS files.
+        src = fetchFromGitHub {
+          owner = "just-the-docs";
+          repo = "just-the-docs";
+          rev ="v${attrs.version}";
+          sha256 = assert attrs.version == "0.4.0.rc1"; "sUgwPio5Lukd8c0dR5kbRxW5vT/ctO69lbyg+AvcUbQ=";
+        };
+
+        patches = super.patches or attrs.patches or [] ++ [
+          # https://github.com/just-the-docs/just-the-docs/pull/944
+          (fetchpatch {
+            url = "https://github.com/alyssais/just-the-docs/commit/6bf1f26ab70b6a12fd090b99cda85f557da837eb.patch";
+            sha256 = "jv3I7Unu6ZMl0hjvBlvTWIVH8cYfO3cVS1BoJnYWo+U=";
+          })
+        ];
+
+        postPatch = ''
+          substituteInPlace just-the-docs.gemspec \
+              --replace 'git ls-files -z' 'find * -print0'
+        '';
+      };
+  };
 }
 ) { }
-- 
2.37.1