1 files changed, 81 insertions, 0 deletions
diff --git a/web/blog/fragments.nix b/web/blog/fragments.nix
new file mode 100644
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+++ b/web/blog/fragments.nix
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+# This file defines various fragments of the blog, such as the header
+# and footer, as functions that receive arguments to be templated into
+# them.
+#
+# An entire post is rendered by `renderPost`, which assembles the
+# fragments together in a runCommand execution.
+#
+# The post overview is rendered by 'postList'.
+{ pkgs, lib, ... }:
+
+let
+  inherit (builtins) filter map hasAttr replaceStrings toFile;
+  inherit (pkgs.third_party) runCommandNoCC writeText;
+
+  escape = replaceStrings [ "<" ">" "&" "'" ] [ "&lt;" "&gt;" "&amp;" "&#39;" ];
+
+  header = title: ''
+  <!DOCTYPE html>
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="description" content="tazjin&#39;s blog">
+    <link rel="stylesheet" type="text/css" href="static/blog.css" media="all">
+    <link rel="alternate" type="application/rss+xml" title="RSS-Feed" href="/rss.xml">
+    <title>tazjin&#39;s blog${lib.optionalString (title != "") (
+      ": " + (escape title)
+    )}</title>
+  </head>
+  <body>
+    <header>
+      <h1><a class="unstyled-link" href="/">tazjin&#39;s blog</a> </h1>
+      <hr>
+    </header>
+  '';
+
+  footer = ''
+    <hr>
+    <footer>
+      <p class="footer">
+        <a class="uncoloured-link" href="https://tazj.in">homepage</a>
+        |
+        <a class="uncoloured-link" href="https://git.tazj.in/about">code</a>
+        |
+        <a class="uncoloured-link" href="https://twitter.com/tazjin">twitter</a>
+      </p>
+      <p class="lod">ಠ_ಠ</p>
+    </footer>
+  </body>
+  '';
+
+  renderPost = post: runCommandNoCC "${post.key}.html" {} ''
+    cat ${toFile "header.html" (header post.title)} > $out
+
+    # Write the actual post
+    echo '<article><h2 class="inline">${escape post.title}</h2>' >> $out
+    echo '<aside class="date">${post.date}</aside>' >> $out
+    cat ${post.content} | ${pkgs.tools.cheddar}/bin/cheddar --about-filter ${post.content} >> $out
+    echo '</article>' >> $out
+
+    cat ${toFile "footer.html" footer} >> $out
+  '';
+
+  # Generate a post list for all listed, non-draft posts.
+  isDraft = post: (hasAttr "draft" post) && post.draft;
+  isUnlisted = post: (hasAttr "listed" post) && !post.listed;
+  includePost = post: !(isDraft post) && !(isUnlisted post);
+
+  indexEntry= post: "<li>a blog post</li>";
+  blogIndex = posts: writeText "blog-index.html" (lib.concatStrings (
+    [
+      (header "")
+      "<ul>"
+    ]
+    ++ (map indexEntry (filter includePost posts))
+    ++ [
+      "</ul>"
+      footer
+    ]));
+in {
+  inherit blogIndex renderPost;
+}