chore(web/blog): Move out of //users/tazjin r/2988

This will also be used for the TVL blog, with status updates of
projects like Tvix.

Note that while this commit evaluates, there are still some things
specific to my blog in this code which I'll untangle in a future commit.

Change-Id: If59431161b165d7249cbb856073a4cae84a1bfbf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3732
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

5 files changed, 51 insertions, 43 deletions

diff --git a/users/tazjin/blog/default.nix b/users/tazjin/blog/default.nix
index a3c373a0fa..fd2f38839a 100644
--- a/users/tazjin/blog/default.nix
+++ b/users/tazjin/blog/default.nix
@@ -1,56 +1,23 @@
-# This creates the static files that make up my blog from the Markdown
-# files in this repository.
-#
-# All blog posts are rendered from Markdown by cheddar.
-{ depot, lib, pkgs, ... }@args:
+{ depot, lib, pkgs, ... }:
 
 with depot.nix.yants;
 
 let
-  inherit (builtins) filter hasAttr map;
+  inherit (builtins) hasAttr filter;
+  inherit (depot.web.blog) post includePost renderPost;
 
-  # Type definition for a single blog post.
-  post = struct "blog-post" {
-    key = string; #
-    title = string;
-    date = int;
-
-    # Optional time at which this post was last updated.
-    updated = option int;
-
-    # Path to the Markdown file containing the post content.
-    content = path;
-
-    # Should this post be included in the index? (defaults to true)
-    listed = option bool;
-
-    # Is this a draft? (adds a banner indicating that the link should
-    # not be shared)
-    draft = option bool;
-
-    # Previously each post title had a numeric ID. For these numeric
-    # IDs, redirects are generated so that old URLs stay compatible.
-    oldKey = option string;
-  };
-
-  posts = list post (import ./posts.nix);
-  fragments = import ./fragments.nix args;
+  posts = filter includePost (list post (import ./posts.nix));
 
   rendered = pkgs.runCommandNoCC "tazjins-blog" {} ''
     mkdir -p $out
 
     ${lib.concatStringsSep "\n" (map (post:
-      "cp ${fragments.renderPost post} $out/${post.key}.html"
+      "cp ${renderPost post} $out/${post.key}.html"
     ) posts)}
   '';
 
-  includePost = post: !(fragments.isDraft post) && !(fragments.isUnlisted post);
 in {
-  inherit post rendered;
-  static = ./static;
-
-  # Only include listed posts
-  posts = filter includePost posts;
+  inherit posts rendered;
 
   # Generate embeddable nginx configuration for redirects from old post URLs
   oldRedirects = lib.concatStringsSep "\n" (map (post: ''
diff --git a/users/tazjin/homepage/default.nix b/users/tazjin/homepage/default.nix
index a8ebe7e282..2ce1cf6322 100644
--- a/users/tazjin/homepage/default.nix
+++ b/users/tazjin/homepage/default.nix
@@ -28,7 +28,7 @@ let
 
   escape = replaceStrings [ "<" ">" "&" "'" ] [ "&lt;" "&gt;" "&amp;" "&#39;" ];
 
-  postToEntry = defun [ users.tazjin.blog.post entry ] (post: {
+  postToEntry = defun [ web.blog.post entry ] (post: {
     class = "blog";
     title = post.title;
     url = "/blog/${post.key}";
diff --git a/users/tazjin/homepage/feed.nix b/users/tazjin/homepage/feed.nix
index 985108ebe0..984b1c2950 100644
--- a/users/tazjin/homepage/feed.nix
+++ b/users/tazjin/homepage/feed.nix
@@ -8,8 +8,7 @@ let
   inherit (lib) max singleton;
   inherit (pkgs) writeText;
   inherit (depot.nix) renderMarkdown;
-  inherit (depot.users.tazjin) blog;
-  inherit (depot.web) atom-feed;
+  inherit (depot.web) blog atom-feed;
 
   postToEntry = defun [ blog.post atom-feed.entry ] (post: rec {
     id = "https://tazj.in/blog/${post.key}";
@@ -37,7 +36,8 @@ let
     };
   });
 
-  allEntries = (map postToEntry blog.posts) ++ (map pageEntryToEntry pageEntries);
+  allEntries = (map postToEntry depot.users.tazjin.blog.posts)
+             ++ (map pageEntryToEntry pageEntries);
 
   mostRecentlyUpdated = foldl' max 0 (map (e: e.updated) allEntries);
 
diff --git a/web/blog/default.nix b/web/blog/default.nix
new file mode 100644
index 0000000000..05367588e3
--- /dev/null
+++ b/web/blog/default.nix
@@ -0,0 +1,41 @@
+# This creates the static files that make up my blog from the Markdown
+# files in this repository.
+#
+# All blog posts are rendered from Markdown by cheddar.
+{ depot, lib, pkgs, ... }@args:
+
+with depot.nix.yants;
+
+let
+  # Type definition for a single blog post.
+  post = struct "blog-post" {
+    key = string; #
+    title = string;
+    date = int;
+
+    # Optional time at which this post was last updated.
+    updated = option int;
+
+    # Path to the Markdown file containing the post content.
+    content = path;
+
+    # Should this post be included in the index? (defaults to true)
+    listed = option bool;
+
+    # Is this a draft? (adds a banner indicating that the link should
+    # not be shared)
+    draft = option bool;
+
+    # Previously each post title had a numeric ID. For these numeric
+    # IDs, redirects are generated so that old URLs stay compatible.
+    oldKey = option string;
+  };
+
+  posts = list post (import ./posts.nix);
+  fragments = import ./fragments.nix args;
+
+  includePost = post: !(fragments.isDraft post) && !(fragments.isUnlisted post);
+in {
+  inherit post includePost;
+  inherit (fragments) renderPost;
+}
diff --git a/users/tazjin/blog/fragments.nix b/web/blog/fragments.nix
index eb46a09fd0..eb46a09fd0 100644
--- a/users/tazjin/blog/fragments.nix
+++ b/web/blog/fragments.nix