Add auto compilation of .md and .typ files to filebrowser

modules/nixos/filebrowser.nix

@@ -1,12 +1,83 @@
-{ config, ... }:
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
 let
   storageRoot = "/var/lib/filebrowser/files";
+  publishDirName = "_publish";
+
+  fontPackages = with pkgs; [
+    libertinus
+    gyre-fonts
+  ];
+
+  processorScript = pkgs.writeShellScriptBin "process-docs" ''
+    SRC_ROOT="${storageRoot}"
+    OUT_ROOT="${storageRoot}/${publishDirName}"
+
+    # Function to compile a single file
+    compile_file() {
+      local file="$1"
+      # Remove SRC_ROOT prefix to get relative path
+      local rel_path="''${file#$SRC_ROOT/}"
+      # Construct target path (swap extension to .pdf)
+      local target="$OUT_ROOT/''${rel_path%.*}.pdf"
+      local target_dir
+      target_dir=$(${pkgs.coreutils}/bin/dirname "$target")
+
+      echo "Processing: $rel_path"
+      ${pkgs.coreutils}/bin/mkdir -p "$target_dir"
+
+      echo "Debug: Checking font visibility..."
+      typst fonts
+
+      if [[ "$file" == *.md ]]; then
+        pandoc "$file" -o "$target" --pdf-engine=typst -V mainfont="Libertinus Serif"
+      elif [[ "$file" == *.typ ]]; then
+        typst compile "$file" "$target"
+      fi
+
+      # Ensure filebrowser can read the new file
+      ${pkgs.coreutils}/bin/chown filebrowser:filebrowser "$target"
+    }
+
+    export -f compile_file
+    export SRC_ROOT OUT_ROOT
+
+    # 1. Initial Scan: Find all .md/.typ files not inside the export dir
+    # and update them if the source is newer than the target
+    ${pkgs.findutils}/bin/find "$SRC_ROOT" -type f \( -name "*.md" -o -name "*.typ" \) \
+      -not -path "$SRC_ROOT/${publishDirName}/*" | while read -r file; do
+        rel="''${file#$SRC_ROOT/}"
+        tgt="$OUT_ROOT/''${rel%.*}.pdf"
+
+        # Only compile if target doesn't exist or source is newer
+        if [ ! -f "$tgt" ] || [ "$file" -nt "$tgt" ]; then
+          compile_file "$file"
+        fi
+    done
+
+    # 2. Watcher Mode
+    echo "Starting watcher on $SRC_ROOT..."
+    # --exclude matches the export dir to prevent infinite loops
+    ${pkgs.inotify-tools}/bin/inotifywait -m -r -e close_write,moved_to \
+      --exclude "${publishDirName}" \
+      --format '%w%f' "$SRC_ROOT" | while read -r file; do
+        if [[ "$file" == *.md ]] || [[ "$file" == *.typ ]]; then
+           compile_file "$file"
+        fi
+    done
+  '';
+
 in
 {
   services.filebrowser = {
     enable = true;
 
     settings = {
+      root = storageRoot;
       port = 9876;
       branding.name = "Jelle's Files";
     };
@@ -15,4 +86,31 @@ in
   services.caddy.virtualHosts."files.jelles.net".extraConfig = ''
     reverse_proxy :${toString config.services.filebrowser.settings.port}
   '';
+
+  systemd.services.pdf-watcher = {
+    description = "Auto-compile MD and Typst to PDF";
+    after = [ "filebrowser.service" ];
+    wantedBy = [ "multi-user.target" ];
+
+    # Important: Run as the same user as Filebrowser to avoid permission issues
+    serviceConfig = {
+      User = "filebrowser";
+      Group = "filebrowser";
+      ExecStart = "${processorScript}/bin/process-docs";
+
+      WorkingDirectory = storageRoot;
+      Environment = [
+        "HOME=/var/lib/filebrowser"
+        "XDG_CACHE_HOME=/var/lib/filebrowser/.cache"
+        "TYPST_FONT_PATHS=${lib.makeSearchPath "share/fonts" fontPackages}"
+      ];
+
+      Restart = "always";
+    };
+
+    path = with pkgs; [
+      typst
+      pandoc
+    ];
+  };
 }