diff --git a/DocGen4/Process/Analyze.lean b/DocGen4/Process/Analyze.lean
index 1ec0e7c..77469af 100644
--- a/DocGen4/Process/Analyze.lean
+++ b/DocGen4/Process/Analyze.lean
@@ -12,14 +12,9 @@ import DocGen4.Process.Base
 import DocGen4.Process.Hierarchy
 import DocGen4.Process.DocInfo
 
-open Std
-
-def HashSet.fromArray [BEq α] [Hashable α] (xs : Array α) : HashSet α :=
-  xs.foldr (flip .insert) .empty
-
 namespace DocGen4.Process
 
-open Lean Meta
+open Lean Meta Std
 
 /--
 Member of a module, either a declaration or some module doc string.
diff --git a/DocGen4/Process/Hierarchy.lean b/DocGen4/Process/Hierarchy.lean
index 32b2805..7727e15 100644
--- a/DocGen4/Process/Hierarchy.lean
+++ b/DocGen4/Process/Hierarchy.lean
@@ -6,9 +6,14 @@ Authors: Henrik Böving
 import Lean
 import Std.Data.HashMap
 
+open Std
+
+def HashSet.fromArray [BEq α] [Hashable α] (xs : Array α) : HashSet α :=
+  xs.foldr (flip .insert) .empty
+
 namespace DocGen4
 
-open Lean Std Name
+open Lean Name
 
 def getNLevels (name : Name) (levels: Nat) : Name :=
   let components := name.components'
@@ -78,5 +83,38 @@ partial def insert! (h : Hierarchy) (n : Name) : Hierarchy := Id.run $ do
 partial def fromArray (names : Array Name) : Hierarchy :=
   names.foldl insert! (empty anonymous false)
 
+def baseDirBlackList : HashSet String :=
+  HashSet.fromArray #[
+    "404.html",
+    "declaration-data.js",
+    "declarations",
+    "find",
+    "how-about.js",
+    "index.html",
+    "mathjax-config.js",
+    "navbar.html",
+    "nav.js",
+    "search.js",
+    "src",
+    "style.css"
+  ]
+
+
+partial def fromDirectoryAux (dir : System.FilePath) (previous : Name) : IO (Array Name) := do
+  let mut children := #[]
+  for entry in ←System.FilePath.readDir dir do
+    if (←entry.path.isDir) then
+      children := children ++ (←fromDirectoryAux entry.path (.str previous entry.fileName))
+    else
+      children := children.push $ .str previous (entry.fileName.dropRight ".html".length)
+  pure children
+
+def fromDirectory (dir : System.FilePath) : IO Hierarchy := do
+    let mut children := #[]
+    for entry in ←System.FilePath.readDir dir do
+      if !baseDirBlackList.contains entry.fileName && (←entry.path.isDir) then
+        children := children ++ (←fromDirectoryAux entry.path (.mkSimple entry.fileName))
+    pure $ Hierarchy.fromArray children
+
 end Hierarchy
 end DocGen4
diff --git a/Main.lean b/Main.lean
index 2005c19..f514be6 100644
--- a/Main.lean
+++ b/Main.lean
@@ -34,16 +34,9 @@ def runSingleCmd (p : Parsed) : IO UInt32 := do
     | Except.error rc => pure rc
 
 def runIndexCmd (p : Parsed) : IO UInt32 := do
-  let topLevelModules ← getTopLevelModules p
-  let res ← lakeSetup topLevelModules
-  match res with
-  | Except.ok _ =>
-    let modules := topLevelModules.map String.toName
-    let hierarchy ← loadInit modules
-    let baseConfig := getSimpleBaseContext hierarchy
-    htmlOutputIndex baseConfig
-    pure 0
-  | Except.error rc => pure rc
+  let hierarchy ← Hierarchy.fromDirectory basePath
+  let baseConfig := getSimpleBaseContext hierarchy
+  htmlOutputIndex baseConfig
   pure 0
 
 def runDocGenCmd (p : Parsed) : IO UInt32 := do