add website with docs

nix/website.nix

@@ -0,0 +1,78 @@
+{ pkgs, root }:
+pkgs.stdenv.mkDerivation {
+  name = "grimu-r-website";
+
+  src = pkgs.lib.cleanSourceWith {
+    src = root;
+    filter = path: type:
+      let
+        baseName = baseNameOf path;
+        relativePath = pkgs.lib.removePrefix (toString root + "/") (toString path);
+      in
+        baseName == "README.org" ||
+        relativePath == "website" ||
+        pkgs.lib.hasPrefix "website/" relativePath;
+  };
+  buildInputs = [ pkgs.pandoc ];
+
+  buildPhase = ''
+    cp $src/website/pandoc-template.html ./
+    mkdir -p ./html/doc
+    cp $src/website/favicon.ico ./html/
+    cp $src/website/llms.txt ./html/
+
+    if [ -d "$src/website/doc" ]; then
+      echo '<nav class="sidebar"><ul>' > docs-nav.html
+      
+      for file in $(find $src/website/doc -name "*.org" -type f | sort); do
+        basename=$(basename "$file" .org)
+        title=$(grep -m1 -i "^#+TITLE:" "$file" | sed 's/^#+TITLE:[[:space:]]*//I' || echo "$basename")
+        echo "<li><a href=\"$basename.html\">$title</a></li>" >> docs-nav.html
+      done
+      
+      echo '</ul></nav>' >> docs-nav.html
+    fi
+
+    if [ -d "$src/website/doc" ]; then
+      for file in $src/website/doc/*.org; do
+        basename=$(basename "$file" .org)
+        pandoc \
+          --template=./pandoc-template.html \
+          --include-before-body=./docs-nav.html \
+          --shift-heading-level-by=1 \
+          --section-divs \
+          -M document-css=false \
+          "$file" \
+          -o "./html/doc/$basename.html"
+      done
+    fi
+
+    pandoc \
+      --template=./pandoc-template.html \
+      --shift-heading-level-by=1 \
+      --section-divs \
+      -M document-css=false \
+      $src/README.org \
+      -o html/index.html
+
+    pandoc \
+      --template=./pandoc-template.html \
+      --shift-heading-level-by=1 \
+      --section-divs \
+      -M document-css=false \
+      $src/website/pitch.org \
+      -o html/pitch.html
+  '';
+
+  installPhase = ''
+    mkdir -p $out/html
+    mkdir -p $out/bin
+    cp -r ./html $out/
+
+    cat > $out/bin/grimu-r-website <<EOF
+#!/usr/bin/env bash
+${pkgs.python3}/bin/python3 -m http.server --directory "$out/html"
+EOF
+    chmod +x $out/bin/grimu-r-website
+  '';
+}