news: reorganize news into YYYY/MM directory structure

- Update news.nix to recursively search for news entries in
subdirectories
- Update create-news-entry.sh to place new entries in YYYY/MM/
directories
- Move existing 2025 news entries to the new structure

This makes the news directory more organized and easier to navigate.

modules/misc/news.nix

@@ -55,12 +55,29 @@ let
   );
 
   isNixFile = n: v: v == "regular" && lib.hasSuffix ".nix" n;
-  # builtins.attrNames return the values in alphabetical order
-  newsFiles = builtins.attrNames (lib.filterAttrs isNixFile (builtins.readDir ./news));
+  isDirectory = n: v: v == "directory";
+
+  # Recursively collect all .nix files from a directory
+  collectNixFiles =
+    dir:
+    let
+      contents = builtins.readDir dir;
+      files = lib.filterAttrs isNixFile contents;
+      fileList = map (file: dir + "/${file}") (builtins.attrNames files);
+
+      # Process subdirectories
+      subdirs = lib.filterAttrs isDirectory contents;
+      subdirFiles = lib.concatMap (subdir: collectNixFiles (dir + "/${subdir}")) (
+        builtins.attrNames subdirs
+      );
+    in
+    fileList ++ subdirFiles;
+
+  newsFiles = collectNixFiles ./news;
   newsEntries = builtins.map (
     newsFile:
     let
-      imported = import (./news + "/${newsFile}");
+      imported = import newsFile;
     in
     if builtins.isFunction imported then imported { inherit config lib pkgs; } else imported
   ) newsFiles;

modules/misc/news/create-news-entry.sh

@@ -2,15 +2,20 @@
 #! nix-shell -I https://github.com/NixOS/nixpkgs/archive/05f0934825c2a0750d4888c4735f9420c906b388.tar.gz -i bash -p coreutils
 
 DATE="$(date --iso-8601=second --universal)"
-FILENAME="$(date --date="$DATE" +"%Y-%m-%d_%H-%M-%S").nix"
+YEAR="$(date --date="$DATE" +"%Y")"
+MONTH="$(date --date="$DATE" +"%m")"
+FILENAME_BASE="$(date --date="$DATE" +"%Y-%m-%d_%H-%M-%S")"
 DIRNAME="$(dirname -- "${BASH_SOURCE[0]}")"
 
+# Create year/month directory structure if it doesn't exist
+mkdir -p "$DIRNAME/$YEAR/$MONTH"
+
 cd "$DIRNAME" || {
   >&2 echo "Failed to change to the script directory: $DIRNAME"
   exit 1
 }
 
-cat - << EOF > "$FILENAME"
+cat - << EOF > "$YEAR/$MONTH/$FILENAME_BASE.nix"
 {
   time = "$DATE";
   condition = true;
@@ -20,5 +25,5 @@ cat - << EOF > "$FILENAME"
 }
 EOF
 
-echo "Successfully created a news file: $DIRNAME/$FILENAME"
+echo "Successfully created a news file: $DIRNAME/$YEAR/$MONTH/$FILENAME_BASE.nix"
 echo "You can open the file above in your text editor and edit now."